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39 | <li class="p-1 sm:p-0"><a class="topnav-link" href="https://www.nwoods.com/products/register.html">Register</a></li>
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43 | target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/contact.html', 'contact');">Contact</a></li>
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45 | target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/sales/index.html', 'buy');">Buy</a></li>
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64 | <a href="index.html">Basics</a>
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65 | <a href="buildingObjects.html">Building Parts</a>
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66 | <a href="usingModels.html">Using Models</a>
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67 | <a href="dataBinding.html">Data Binding</a>
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68 | <a href="react.html">GoJS with React</a>
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69 | <a href="angular.html">GoJS with Angular</a>
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81 | <a href="initialView.html">Initial View</a>
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82 | <a href="collections.html">Collections</a>
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83 | <a href="links.html">Links</a>
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84 | <a href="linkLabels.html">Link Labels</a>
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114 | <a href="extensions.html">Extensions</a>
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115 | <a href="geometry.html">Geometry Strings</a>
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124 | <a href="storage.html">Storage</a>
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125 | <a href="performance.html">Performance</a>
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126 | <a href="source.html">Building from Source</a>
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127 | <a href="platforms.html">Platforms</a>
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128 | <a href="deployment.html">Deployment</a>
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129 | </nav>
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130 | </div>
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131 | <div class="pt-4 px-2 md:px-0 lg:px-4 pb-16 w-full overflow-hidden">
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132 |
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133 |
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134 |
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135 |
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136 | <h1>Links</h1>
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137 | <p>
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138 | Use the <a>Link</a> class to implement a visual relationship between nodes.
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139 | </p>
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140 | <p>
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141 | See samples that make use of customized Links in the <a href="../samples/index.html#links">samples index</a>.
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142 | </p>
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143 |
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144 | <h2 id="CreatingLinks">Creating Links</h2>
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145 | <p>
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146 | Links are normally created by the presence of link data objects in the <a>GraphLinksModel.linkDataArray</a>
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147 | or by a parent key reference as the value of the <a>TreeModel.nodeParentKeyProperty</a> of a node data object
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148 | in a <a>TreeModel</a>.
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149 | Users can draw new links by using the <a>LinkingTool</a>: Introduction to the <a href="tools.html#LinkingToolAndRelinkingTool">Linking Tools</a>.
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150 | </p>
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151 | <p>
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152 | You can create new links programmatically by modifying the model.
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153 | It is most common to operate directly on the model by either calling <a>GraphLinksModel.addLinkData</a>
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154 | or by calling <a>TreeModel.setParentKeyForNodeData</a>.
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155 | Such changes are observed by all diagrams that are displaying the model so that they can automatically
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156 | create the corresponding <a>Link</a>s.
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157 | You can find examples of calls to <a>GraphLinksModel.addLinkData</a> in the samples.
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158 | </p>
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159 | <p>
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160 | It is also possible to create new links without detailed knowledge of the diagram's model by calling
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161 | <a>LinkingTool.insertLink</a>. That is how the user's actions to draw a new link actually create it.
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162 | That method knows how to modify the <a>GraphLinksModel</a> or the <a>TreeModel</a> appropriately,
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163 | while respecting the additional functionality offered by the <a>LinkingTool.archetypeLinkData</a>
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164 | and other properties of the <a>LinkingTool</a>.
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165 | You can find examples of calls to <a>LinkingTool.insertLink</a> in the samples.
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166 | </p>
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167 |
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168 | <h2 id="NondirectionalLinks">Non-directional Links</h2>
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169 | <p>
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170 | The simplest links are those without arrowheads to indicate a visual direction.
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171 | Either the relationship really is non-directional, or the direction is implicit in the organization of the diagram.
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172 | </p>
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173 | <p>
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174 | The template contains a <a>Shape</a> as the main element, as the line that is drawn between nodes.
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175 | After the link's route is computed the main Shape will get a <a>Geometry</a> based on the points in the route.
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176 | </p>
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177 | <pre class="lang-js" id="noArrowheads"><code>
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178 | diagram.nodeTemplate =
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179 | $(go.Node, "Auto",
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180 | new go.Binding("location", "loc", go.Point.parse),
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181 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
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182 | $(go.TextBlock, { margin: 5 },
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183 | new go.Binding("text", "key"))
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184 | );
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185 |
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186 | diagram.linkTemplate =
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187 | $(go.Link, // the whole link panel
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188 | $(go.Shape) // the link shape, default black stroke
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189 | );
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190 |
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191 | var nodeDataArray = [
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192 | { key: "Alpha", loc: "0 0" },
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193 | { key: "Beta", loc: "100 50" }
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194 | ];
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195 | var linkDataArray = [
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196 | { from: "Alpha", to: "Beta" }
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197 | ];
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198 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
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199 | </code></pre>
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200 | <script>goCode("noArrowheads", 600, 100)</script>
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201 | <p>
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202 | By default the way that the model and diagram know about the node data references of a link data is
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203 | by looking at its from and to properties.
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204 | If you want to use a different properties on the link data, set <a>GraphLinksModel.linkFromKeyProperty</a> to be the name
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205 | of the property that results in the node data's key, and similarly for the <a>GraphLinksModel.linkToKeyProperty</a>.
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206 | </p>
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207 |
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208 | <h2 id="Arrowheads">Arrowheads</h2>
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209 | <p>
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210 | Many links do want to indicate directionality by using arrowheads.
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211 | <b>GoJS</b> makes it easy to create common arrowheads: just add a Shape and set its <a>Shape.toArrow</a> property.
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212 | Setting that property will automatically assign a <a>Geometry</a> to the <a>Shape.geometry</a>
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213 | and will set other properties so that the arrowhead is positioned at the head of the link and is pointing in the correct direction.
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214 | Of course you can set the other Shape properties such as <a>Shape.fill</a> in order to customize the appearance of the arrowhead.
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215 | </p>
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216 | <pre class="lang-js" id="arrowheads"><code>
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217 | diagram.nodeTemplate =
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218 | $(go.Node, "Auto",
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219 | new go.Binding("location", "loc", go.Point.parse),
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220 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
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221 | $(go.TextBlock, { margin: 5 },
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222 | new go.Binding("text", "key"))
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223 | );
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224 |
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225 | diagram.linkTemplate =
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226 | $(go.Link,
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227 | $(go.Shape), // the link shape
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228 | $(go.Shape, // the arrowhead
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229 | { toArrow: "OpenTriangle", fill: null })
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230 | );
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231 |
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232 | var nodeDataArray = [
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233 | { key: "Alpha", loc: "0 0" },
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234 | { key: "Beta", loc: "100 50" }
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235 | ];
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236 | var linkDataArray = [
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237 | { from: "Alpha", to: "Beta" }
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238 | ];
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239 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
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240 | </code></pre>
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241 | <script>goCode("arrowheads", 600, 100)</script>
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242 | <p>
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243 | You can see all of the predefined arrowhead types in the <a href="../samples/arrowheads.html" target="samples">Arrowheads Sample</a>.
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244 | </p>
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245 | <p>
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246 | You can also have an arrowhead at the start of the link: set the <a>Shape.fromArrow</a> property.
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247 | Note that an arrowhead normally goes along the path of the link regardless of its position on the path,
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248 | so just as with a real arrow, setting <code>{ fromArrow: "TripleFeathers" }</code> has the "feathers" pointing forward.
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249 | If the link is meant to be bi-directional, the arrowhead name for the "from" end of a link
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250 | will probably want to start with the string "Backward...".
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251 | </p>
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252 |
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253 | <h2 id="Routing">Routing</h2>
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254 | <p>
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255 | If you want to customize the path that each <a>Link</a> takes, you need to set properties on the link.
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256 | The property that has the most general effect on the points that the link's route follows is <a>Link.routing</a>.
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257 | </p>
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258 | <p>
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259 | This example shows the two most common routing values: <a>Link,Normal</a> (the default) and <a>Link,Orthogonal</a>.
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260 | </p>
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261 | <pre class="lang-js" id="routing"><code>
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262 | diagram.nodeTemplate =
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263 | $(go.Node, "Auto",
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264 | new go.Binding("location", "loc", go.Point.parse),
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265 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
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266 | $(go.TextBlock, { margin: 5 },
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267 | new go.Binding("text", "key"))
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268 | );
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269 |
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270 | diagram.linkTemplate =
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271 | $(go.Link,
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272 | new go.Binding("routing", "routing"),
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273 | $(go.Shape),
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274 | $(go.Shape, { toArrow: "Standard" })
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275 | );
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276 |
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277 | var nodeDataArray = [
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278 | { key: "Alpha", loc: "0 0" },
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279 | { key: "Beta", loc: "50 50" },
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280 | { key: "Gamma", loc: "100 25" }
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281 | ];
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282 | var linkDataArray = [
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283 | { from: "Alpha", to: "Beta", routing: go.Link.Normal },
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284 | { from: "Alpha", to: "Gamma", routing: go.Link.Orthogonal }
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285 | ];
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286 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
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287 | </code></pre>
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288 | <script>goCode("routing", 600, 100)</script>
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289 |
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290 | <p>
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291 | Note that the computed route also depends on the properties of the node, including its shape.
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292 | There are other properties, including <a>GraphObject.fromSpot</a> and <a>GraphObject.toSpot</a>, that affect the route.
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293 | For more discussion about spots, please read this Introduction page: <a href="connectionPoints.html">Link Connection Points</a>.
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294 | Furthermore some <a>Layout</a>s set properties on links to control their routing according to what the layout expects.
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295 | </p>
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296 |
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297 | <p>
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298 | You can also set <a>Link.routing</a> to <a>Link,AvoidsNodes</a>:
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299 | </p>
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300 | <pre class="lang-js" id="avoidsNodes"><code>
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301 | diagram.nodeTemplate =
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302 | $(go.Node, "Auto",
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303 | new go.Binding("location", "loc", go.Point.parse),
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304 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
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305 | $(go.TextBlock, { margin: 5 },
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306 | new go.Binding("text", "key"))
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307 | );
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308 |
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309 | diagram.linkTemplate =
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310 | $(go.Link,
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311 | { routing: go.Link.AvoidsNodes }, // link route should avoid nodes
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312 | $(go.Shape),
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313 | $(go.Shape, { toArrow: "Standard" })
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314 | );
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315 |
|
316 | var nodeDataArray = [
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317 | { key: "Alpha", loc: "0 0" },
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318 | { key: "Beta", loc: "250 40" },
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319 | { key: "Gamma", loc: "100 0" },
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320 | { key: "Delta", loc: "75 50" },
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321 | { key: "Epsilon", loc: "150 30" }
|
322 | ];
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323 | var linkDataArray = [
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324 | { from: "Alpha", to: "Beta" }
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325 | ];
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326 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
327 | </code></pre>
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328 | <script>goCode("avoidsNodes", 600, 100)</script>
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329 | <p>
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330 | If you move the nodes interactively, you can see how the link's route adjusts to avoid crossing over nodes.
|
331 | Notice that a small gap between nodes might not be considered wide enough for links to go through.
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332 | </p>
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333 | <p>
|
334 | If a node is very close to or overlaps with either the link's <a>Link.fromNode</a> or <a>Link.toNode</a>
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335 | and would block the link's route, it ignores that node, treating it as if it were just an extension of the connected node.
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336 | Also if no node-avoiding route exists because there is a ring of nodes around one of the connected nodes,
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337 | the routing algorithm will give up and cross over some nodes anyway.
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338 | </p>
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339 | <p>
|
340 | You can declare that it is OK to route through a node by setting <a>Node.avoidable</a> to false.
|
341 | This is commonly done for <a>Group</a>s to allow links connecting outside of the group to route nicely within the group.
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342 | </p>
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343 | <p>
|
344 | Note the the use of AvoidsNodes routing is distinctly slower than normal Orthogonal routing, especially for large diagrams.
|
345 | </p>
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346 |
|
347 | <h3 id="EndSegmentLengths">End Segment Lengths</h3>
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348 | <p>
|
349 | Another way to affect the precise route that Orthogonal and AvoidsNodes routing take is to set or bind
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350 | <a>GraphObject.fromEndSegmentLength</a> and <a>GraphObject.toEndSegmentLength</a>.
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351 | These properties determine the length of the very first segment or the very last segment, but only for orthogonally routed links.
|
352 | Those properties can be set either on the port element of the node or on the link.
|
353 | On the link the property value takes precedence over the corresponding property's value at the port.
|
354 | </p>
|
355 | <pre data-language="javascript" id="endseg">
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356 | diagram.nodeTemplate =
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357 | $(go.Node, "Auto",
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358 | new go.Binding("location", "loc", go.Point.parse),
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359 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
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360 | $(go.TextBlock, { margin: 5 },
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361 | new go.Binding("text", "key"))
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362 | );
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363 |
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364 | diagram.linkTemplate =
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365 | $(go.Link,
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366 | { routing: go.Link.Orthogonal, fromSpot: go.Spot.Left, toSpot: go.Spot.Right },
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367 | new go.Binding("fromEndSegmentLength"),
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368 | new go.Binding("toEndSegmentLength"),
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369 | $(go.Shape),
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370 | $(go.Shape, { toArrow: "Standard" })
|
371 | );
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372 |
|
373 | var nodeDataArray = [
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374 | { key: "Alpha", loc: "0 0" },
|
375 | { key: "Beta", loc: "100 50" },
|
376 | { key: "Gamma", loc: "0 100" },
|
377 | { key: "Delta", loc: "100 150" }
|
378 | ];
|
379 | var linkDataArray = [
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380 | { from: "Alpha", to: "Beta" },
|
381 | { from: "Gamma", to: "Delta", fromEndSegmentLength: 4, toEndSegmentLength: 30 },
|
382 | ];
|
383 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
384 | </code></pre>
|
385 | <script>goCode("endseg", 600, 200)</script>
|
386 | <p>
|
387 | In this example the values of the <a>Link.fromEndSegmentLength</a> and <a>Link.toEndSegmentLength</a> are bound
|
388 | to the same named properties on the link data.
|
389 | In both cases the link's route is force to come out of the left side of the source node and to the right side of the destination node.
|
390 | In the case from "Alpha" to "Beta", you see the default behavior.
|
391 | In the case from "Gamma" to "Delta", you see the results of a shorter-than-normal <code>fromEndSegmentLength</code>
|
392 | and a longer-than-normal <code>toEndSegmentLength</code>.
|
393 | </p>
|
394 |
|
395 | <h2 id="CurveCurvinessCorner">Curve, Curviness, Corner</h2>
|
396 | <p>
|
397 | Once the <a>Link.routing</a> determines the route (i.e., the sequence of points) that the link takes,
|
398 | other properties control the details of how the link shape gets its path geometry.
|
399 | The first such property is <a>Link.curve</a>, which controls whether the link shape has basically straight segments
|
400 | or is a big curve.
|
401 | </p>
|
402 | <p>
|
403 | The default value for <a>Link.curve</a> is <a>Link,None</a>, which produces link shapes with straight segments
|
404 | as you see above.
|
405 | </p>
|
406 | <p>
|
407 | A value of <a>Link,Bezier</a> produces a naturally curved path for the link shape.
|
408 | </p>
|
409 |
|
410 | <pre class="lang-js" id="bezier"><code>
|
411 | diagram.nodeTemplate =
|
412 | $(go.Node, "Auto",
|
413 | new go.Binding("location", "loc", go.Point.parse),
|
414 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
415 | $(go.TextBlock, { margin: 5 },
|
416 | new go.Binding("text", "key"))
|
417 | );
|
418 |
|
419 | diagram.linkTemplate =
|
420 | $(go.Link,
|
421 | { curve: go.Link.Bezier }, // Bezier curve
|
422 | $(go.Shape),
|
423 | $(go.Shape, { toArrow: "Standard" })
|
424 | );
|
425 |
|
426 | var nodeDataArray = [
|
427 | { key: "Alpha", loc: "0 0" },
|
428 | { key: "Beta", loc: "100 50" }
|
429 | ];
|
430 | var linkDataArray = [
|
431 | { from: "Alpha", to: "Beta" }
|
432 | ];
|
433 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
434 | </code></pre>
|
435 | <script>goCode("bezier", 600, 100)</script>
|
436 | <p>
|
437 | You can control how curved it is by setting the <a>Link.curviness</a> property.
|
438 | The default produces a slight curve.
|
439 | </p>
|
440 |
|
441 | <p>
|
442 | If there are multiple links, it will automatically compute reasonable values for the curviness of each link,
|
443 | unless you assign <a>Link.curviness</a> explicitly.
|
444 | </p>
|
445 | <pre class="lang-js" id="beziers"><code>
|
446 | diagram.nodeTemplate =
|
447 | $(go.Node, "Auto",
|
448 | new go.Binding("location", "loc", go.Point.parse),
|
449 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
450 | $(go.TextBlock, { margin: 5 },
|
451 | new go.Binding("text", "key"))
|
452 | );
|
453 |
|
454 | diagram.linkTemplate =
|
455 | $(go.Link,
|
456 | { curve: go.Link.Bezier },
|
457 | $(go.Shape),
|
458 | $(go.Shape, { toArrow: "Standard" })
|
459 | );
|
460 |
|
461 | var nodeDataArray = [
|
462 | { key: "Alpha", loc: "0 0" },
|
463 | { key: "Beta", loc: "100 50" }
|
464 | ];
|
465 | var linkDataArray = [
|
466 | { from: "Alpha", to: "Beta" }, // multiple links between the same nodes
|
467 | { from: "Alpha", to: "Beta" },
|
468 | { from: "Alpha", to: "Beta" },
|
469 | { from: "Alpha", to: "Beta" }
|
470 | ];
|
471 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
472 | </code></pre>
|
473 | <script>goCode("beziers", 600, 100)</script>
|
474 |
|
475 | <p>
|
476 | Another kind of curviness comes from rounded corners when the <a>Link.routing</a> is Orthogonal or AvoidsNodes.
|
477 | </p>
|
478 | <pre class="lang-js" id="corners"><code>
|
479 | diagram.nodeTemplate =
|
480 | $(go.Node, "Auto",
|
481 | new go.Binding("location", "loc", go.Point.parse),
|
482 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
483 | $(go.TextBlock, { margin: 5 },
|
484 | new go.Binding("text", "key"))
|
485 | );
|
486 |
|
487 | diagram.linkTemplate =
|
488 | $(go.Link,
|
489 | { routing: go.Link.AvoidsNodes,
|
490 | corner: 10 }, // rounded corners
|
491 | $(go.Shape),
|
492 | $(go.Shape, { toArrow: "Standard" })
|
493 | );
|
494 |
|
495 | var nodeDataArray = [
|
496 | { key: "Alpha", loc: "0 0" },
|
497 | { key: "Beta", loc: "250 40" },
|
498 | { key: "Gamma", loc: "100 0" },
|
499 | { key: "Delta", loc: "75 50" },
|
500 | { key: "Epsilon", loc: "150 30" }
|
501 | ];
|
502 | var linkDataArray = [
|
503 | { from: "Alpha", to: "Beta" }
|
504 | ];
|
505 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
506 | </code></pre>
|
507 | <script>goCode("corners", 600, 100)</script>
|
508 |
|
509 | <p>
|
510 | Another kind of curviness comes from setting <a>Link.curve</a> to <a>Link,JumpOver</a>.
|
511 | This causes little "hops" in the path of an orthogonal link that crosses another orthogonal link
|
512 | that also has a JumpOver curve.
|
513 | </p>
|
514 | <pre class="lang-js" id="jumpOvers"><code>
|
515 | diagram.nodeTemplate =
|
516 | $(go.Node, "Auto",
|
517 | { locationSpot: go.Spot.Center },
|
518 | new go.Binding("location", "loc", go.Point.parse),
|
519 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
520 | $(go.TextBlock, { margin: 5 },
|
521 | new go.Binding("text", "key"))
|
522 | );
|
523 |
|
524 | diagram.linkTemplate =
|
525 | $(go.Link,
|
526 | { routing: go.Link.Orthogonal, // may be either Orthogonal or AvoidsNodes
|
527 | curve: go.Link.JumpOver },
|
528 | $(go.Shape),
|
529 | $(go.Shape, { toArrow: "Standard" })
|
530 | );
|
531 |
|
532 | var nodeDataArray = [
|
533 | { key: "Alpha", loc: "0 50" },
|
534 | { key: "Beta", loc: "100 50" },
|
535 | { key: "Alpha2", loc: "50 0" },
|
536 | { key: "Beta2", loc: "50 100" }
|
537 | ];
|
538 | var linkDataArray = [
|
539 | { from: "Alpha", to: "Beta" }, // these two links will cross
|
540 | { from: "Alpha2", to: "Beta2" }
|
541 | ];
|
542 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
543 | </code></pre>
|
544 | <script>goCode("jumpOvers", 600, 150)</script>
|
545 |
|
546 | <p>
|
547 | Note that the use of link jumping is distinctly slower than normal links because all of the crossing
|
548 | points must be computed and the geometry of the link shape will be more complex.
|
549 | </p>
|
550 |
|
551 | <p>
|
552 | Another kind of curviness (or actually lack of it) comes from setting <a>Link.curve</a> to <a>Link,JumpGap</a>.
|
553 | This causes little "gaps" in the path of an orthogonal link that crosses another orthogonal link
|
554 | that also has a JumpGap curve.
|
555 | </p>
|
556 | <pre class="lang-js" id="jumpGaps"><code>
|
557 | diagram.nodeTemplate =
|
558 | $(go.Node, "Auto",
|
559 | { locationSpot: go.Spot.Center },
|
560 | new go.Binding("location", "loc", go.Point.parse),
|
561 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
562 | $(go.TextBlock, { margin: 5 },
|
563 | new go.Binding("text", "key"))
|
564 | );
|
565 |
|
566 | diagram.linkTemplate =
|
567 | $(go.Link,
|
568 | { routing: go.Link.Orthogonal, // may be either Orthogonal or AvoidsNodes
|
569 | curve: go.Link.JumpGap },
|
570 | $(go.Shape),
|
571 | $(go.Shape, { toArrow: "Standard" })
|
572 | );
|
573 |
|
574 | var nodeDataArray = [
|
575 | { key: "Alpha", loc: "0 50" },
|
576 | { key: "Beta", loc: "100 50" },
|
577 | { key: "Alpha2", loc: "50 0" },
|
578 | { key: "Beta2", loc: "50 100" }
|
579 | ];
|
580 | var linkDataArray = [
|
581 | { from: "Alpha", to: "Beta" }, // these two links will cross
|
582 | { from: "Alpha2", to: "Beta2" }
|
583 | ];
|
584 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
585 | </code></pre>
|
586 | <script>goCode("jumpGaps", 600, 150)</script>
|
587 |
|
588 | <h2 id="EasierClickingOnLinks">Easier Clicking on Links</h2>
|
589 | <p>
|
590 | A problem that users may notice, especially when using fingers but also with the mouse,
|
591 | is that it can be difficult to click on links that have a thin <a>Link.path</a>.
|
592 | One could set the <a>Shape.strokeWidth</a> to a larger value, such as 8, but you may not want that appearance.
|
593 | </p>
|
594 | <pre class="lang-js" id="thickPath"><code>
|
595 | diagram.nodeTemplate =
|
596 | $(go.Node, "Auto",
|
597 | new go.Binding("location", "loc", go.Point.parse),
|
598 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
599 | $(go.TextBlock, { margin: 5 },
|
600 | new go.Binding("text", "key"))
|
601 | );
|
602 |
|
603 | diagram.linkTemplate =
|
604 | $(go.Link,
|
605 | $(go.Shape, { strokeWidth: 8 }), // thick path
|
606 | $(go.Shape, { toArrow: "Standard" })
|
607 | );
|
608 |
|
609 | var nodeDataArray = [
|
610 | { key: "Alpha", loc: "0 0" },
|
611 | { key: "Beta", loc: "100 50" }
|
612 | ];
|
613 | var linkDataArray = [
|
614 | { from: "Alpha", to: "Beta" }
|
615 | ];
|
616 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
617 | </code></pre>
|
618 | <script>goCode("thickPath", 600, 100)</script>
|
619 |
|
620 | <p>
|
621 | The solution is to add a thick path Shape but not have it draw anything.
|
622 | This is easily done by setting <code>{ stroke: "transparent", strokeWidth: 8 }</code>.
|
623 | However if you want to keep the original path Shape, <em>both</em> Shapes need to be declared as the "main" element
|
624 | for the Link by setting <a>GraphObject.isPanelMain</a> to true.
|
625 | The Link panel knows that all such Shapes should get the same computed Geometry for the link path.
|
626 | </p>
|
627 | <pre class="lang-js" id="doublePath"><code>
|
628 | diagram.nodeTemplate =
|
629 | $(go.Node, "Auto",
|
630 | new go.Binding("location", "loc", go.Point.parse),
|
631 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
632 | $(go.TextBlock, { margin: 5 },
|
633 | new go.Binding("text", "key"))
|
634 | );
|
635 |
|
636 | diagram.linkTemplate =
|
637 | $(go.Link,
|
638 | $(go.Shape, { isPanelMain: true, stroke: "transparent", strokeWidth: 8 }), // thick undrawn path
|
639 | $(go.Shape, { isPanelMain: true }), // default stroke === "black", strokeWidth === 1
|
640 | $(go.Shape, { toArrow: "Standard" })
|
641 | );
|
642 |
|
643 | var nodeDataArray = [
|
644 | { key: "Alpha", loc: "0 0" },
|
645 | { key: "Beta", loc: "100 50" }
|
646 | ];
|
647 | var linkDataArray = [
|
648 | { from: "Alpha", to: "Beta" }
|
649 | ];
|
650 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
651 | </code></pre>
|
652 | <script>goCode("doublePath", 600, 100)</script>
|
653 | <p>
|
654 | In this example you will find it easier to select the link than without the second transparent link path shape.
|
655 | </p>
|
656 | <p>
|
657 | The transparent shape can also be used for highlighting purposes.
|
658 | For example, to implement the effect of highlighting the link when the mouse passes over it,
|
659 | add <a>GraphObject.mouseEnter</a> and <a>GraphObject.mouseLeave</a> event handlers:
|
660 | </p>
|
661 | <pre class="lang-js" id="doublePathHighlight"><code>
|
662 | diagram.nodeTemplate =
|
663 | $(go.Node, "Auto",
|
664 | new go.Binding("location", "loc", go.Point.parse),
|
665 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
666 | $(go.TextBlock, { margin: 5 },
|
667 | new go.Binding("text", "key"))
|
668 | );
|
669 |
|
670 | diagram.linkTemplate =
|
671 | $(go.Link,
|
672 | $(go.Shape, { isPanelMain: true, stroke: "transparent", strokeWidth: 8 }), // thick undrawn path
|
673 | $(go.Shape, { isPanelMain: true }), // default stroke === "black", strokeWidth === 1
|
674 | $(go.Shape, { toArrow: "Standard" }),
|
675 | {
|
676 | // a mouse-over highlights the link by changing the first main path shape's stroke:
|
677 | mouseEnter: function(e, link) { link.elt(0).stroke = "rgba(0,90,156,0.3)"; },
|
678 | mouseLeave: function(e, link) { link.elt(0).stroke = "transparent"; }
|
679 | }
|
680 | );
|
681 |
|
682 | var nodeDataArray = [
|
683 | { key: "Alpha", loc: "0 0" },
|
684 | { key: "Beta", loc: "100 50" }
|
685 | ];
|
686 | var linkDataArray = [
|
687 | { from: "Alpha", to: "Beta" }
|
688 | ];
|
689 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
690 | </code></pre>
|
691 | <script>goCode("doublePathHighlight", 600, 100)</script>
|
692 | <p>
|
693 | Pass the mouse over the link to see the effect.
|
694 | Such feedback also helps the user click or context click on the link.
|
695 | </p>
|
696 |
|
697 | <h2 id="ShortLengths">Short Lengths</h2>
|
698 | <p>
|
699 | Note in the example above with the thick black path shape,
|
700 | that the arrowhead seems to have disappeared due to the thickness of the link path.
|
701 | One can avoid the problem by increasing the <a>GraphObject.scale</a> of the arrowhead, perhaps to 2.
|
702 | </p>
|
703 | <pre class="lang-js" id="thickPath2"><code>
|
704 | diagram.nodeTemplate =
|
705 | $(go.Node, "Auto",
|
706 | new go.Binding("location", "loc", go.Point.parse),
|
707 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
708 | $(go.TextBlock, { margin: 5 },
|
709 | new go.Binding("text", "key"))
|
710 | );
|
711 |
|
712 | diagram.linkTemplate =
|
713 | $(go.Link,
|
714 | $(go.Shape, { strokeWidth: 8 }), // thick path
|
715 | $(go.Shape, { toArrow: "Standard", scale: 2 }) // bigger arrowhead
|
716 | );
|
717 |
|
718 | var nodeDataArray = [
|
719 | { key: "Alpha", loc: "0 0" },
|
720 | { key: "Beta", loc: "100 50" }
|
721 | ];
|
722 | var linkDataArray = [
|
723 | { from: "Alpha", to: "Beta" }
|
724 | ];
|
725 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
726 | </code></pre>
|
727 | <script>goCode("thickPath2", 600, 100)</script>
|
728 |
|
729 | <p>
|
730 | Now the arrowhead is clearly visible.
|
731 | But that in turn shows that the arrowhead is still obscured at the very end of the link path,
|
732 | where it is too wide to show the point of the arrowhead.
|
733 | That problem can be avoided by setting <a>Link.toShortLength</a> to a value such as 8,
|
734 | depending on the kind of arrowhead used.
|
735 | The path geometry will be shortened by that distance so that the link path does not interfere with the arrowhead.
|
736 | </p>
|
737 | <pre class="lang-js" id="shortLength"><code>
|
738 | diagram.nodeTemplate =
|
739 | $(go.Node, "Auto",
|
740 | new go.Binding("location", "loc", go.Point.parse),
|
741 | $(go.Shape, "RoundedRectangle", { fill: "lightgray" }),
|
742 | $(go.TextBlock, { margin: 5 },
|
743 | new go.Binding("text", "key"))
|
744 | );
|
745 |
|
746 | diagram.linkTemplate =
|
747 | $(go.Link,
|
748 | { toShortLength: 8 }, // shortens path to avoid interfering with arrowhead
|
749 | $(go.Shape, { strokeWidth: 8 }), // thick path
|
750 | $(go.Shape, { toArrow: "Standard", scale: 2 }) // bigger arrowhead
|
751 | );
|
752 |
|
753 | var nodeDataArray = [
|
754 | { key: "Alpha", loc: "0 0" },
|
755 | { key: "Beta", loc: "100 50" }
|
756 | ];
|
757 | var linkDataArray = [
|
758 | { from: "Alpha", to: "Beta" }
|
759 | ];
|
760 | diagram.model = new go.GraphLinksModel(nodeDataArray, linkDataArray);
|
761 | </code></pre>
|
762 | <script>goCode("shortLength", 600, 100)</script>
|
763 |
|
764 | <p>
|
765 | There is also a <a>Link.fromShortLength</a> property, to control how far the "from" end of the link path is drawn.
|
766 | If there is an end segment, the distance that it can be shortened is limited to the corresponding
|
767 | <a>Link.toEndSegmentLength</a> or <a>Link.fromEndSegmentLength</a>.
|
768 | Note also that the short length may be negative, which would cause the link path to be drawn longer --
|
769 | into the port at which the link is connected.
|
770 | </p>
|
771 |
|
772 | <h2 id="DisconnectedLinks">Disconnected Links</h2>
|
773 | <p>
|
774 | The normal expectation is that one cannot have a link relationship unless it connects two nodes.
|
775 | However <b>GoJS</b> does support the creation and manipulation of links that have either or both of
|
776 | the <a>Link.fromNode</a> and <a>Link.toNode</a> properties with null values.
|
777 | This is demonstrated by the <a href="../samples/draggableLink.html">Draggable Link</a> sample.
|
778 | </p>
|
779 | <p>
|
780 | Both ends of the link must be connected to nodes in order for the standard link routing to operate.
|
781 | If a link does not know where to start or where to end, it cannot compute a route or a position for the link.
|
782 | However, you can provide a route by setting or binding <a>Link.points</a> to a list of two or more Points.
|
783 | That will automatically give the link a position so that it can be seen in the diagram.
|
784 | </p>
|
785 | <p>
|
786 | The linking tools, <a>LinkingTool</a> and <a>RelinkingTool</a>, normally do not permit the creation
|
787 | or reconnection of links that connect with "nothing".
|
788 | However, you can set <a>LinkingBaseTool.isUnconnectedLinkValid</a> to true to allow the user to do so,
|
789 | as the Draggable Link sample demonstrates.
|
790 | </p>
|
791 | <p>
|
792 | Links cannot normally be dragged unless they are part of a collection that includes the connected nodes.
|
793 | However, you can set <a>DraggingTool.dragsLink</a> to true to allow the user to drag a solitary <a>Link</a>.
|
794 | This mode allows the user to disconnect a link by dragging it away from the node(s)/port(s) to which it was attached.
|
795 | It also allows the user to reconnect one or both ends of the link by dropping it so that the end(s) are at valid port(s).
|
796 | This too is demonstrated by the Draggable Link sample.
|
797 | </p>
|
798 |
|
799 | </div>
|
800 | </div>
|
801 |
|
802 | <div class="bg-nwoods-primary">
|
803 | <section class="max-w-screen-lg text-white container mx-auto py-2 px-12">
|
804 | <p id="version" class="leading-none mb-2 my-4">GoJS</p>
|
805 | </section>
|
806 | </div><footer class="bg-nwoods-primary text-white">
|
807 | <div class="container max-w-screen-lg mx-auto px-8">
|
808 | <div class="w-full py-6">
|
809 |
|
810 | <div class="max-w-screen-lg xl:max-w-screen-xl mx-auto px-4 sm:px-6 md:px-8">
|
811 | <ul class="text-sm font-medium pb-14 sm:pb-20 grid grid-cols-1 sm:grid-cols-3 gap-y-10">
|
812 | <li class="list-none row-span-2">
|
813 | <h2 class="text-base font-semibold tracking-wide">GoJS</h2>
|
814 | <ul class="list-none space-y-4 md:space-y-1 px-0">
|
815 | <li>
|
816 | <a href="../samples/index.html">Samples</a>
|
817 | </li>
|
818 | <li>
|
819 | <a href="../learn/index.html">Learn</a>
|
820 | </li>
|
821 | <li>
|
822 | <a href="../intro/index.html">Intro</a>
|
823 | </li>
|
824 | <li>
|
825 | <a href="../api/index.html">API</a>
|
826 | </li>
|
827 | <li>
|
828 | <a href="../changelog.html">Changelog</a>
|
829 | </li>
|
830 | <li>
|
831 | <a href="https://github.com/NorthwoodsSoftware/GoJS">GitHub</a>
|
832 | </li>
|
833 | </ul>
|
834 | </li>
|
835 | <li class="list-none row-span-2">
|
836 | <h2 class="text-base font-semibold tracking-wide">Support</h2>
|
837 | <ul class="list-none space-y-4 md:space-y-1 px-0">
|
838 | <li>
|
839 | <a href="https://www.nwoods.com/contact.html"
|
840 | target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/contact.html', 'contact');">Contact</a>
|
841 | </li>
|
842 | <li>
|
843 | <a href="https://forum.nwoods.com/c/gojs">Forum</a>
|
844 | </li>
|
845 | <li>
|
846 | <a href="https://www.nwoods.com/app/activate.aspx?sku=gojs">Activate</a>
|
847 | </li>
|
848 | <li>
|
849 | <a href="https://www.nwoods.com/sales/index.html"
|
850 | target="_blank" rel="noopener" onclick="getOutboundLink('https://www.nwoods.com/sales/index.html', 'buy');">Buy</a>
|
851 | </li>
|
852 | <li>
|
853 | <a href="https://www.youtube.com/channel/UC9We8EoX596-6XFjJDtZIDg">Videos</a>
|
854 | </li>
|
855 | </ul>
|
856 | </li>
|
857 | <li class="list-none row-span-2">
|
858 | <h2 class="text-base font-semibold tracking-wide">Company</h2>
|
859 | <ul class="list-none space-y-4 md:space-y-1 px-0">
|
860 | <li>
|
861 | <a href="https://www.nwoods.com">Northwoods</a>
|
862 | </li>
|
863 | <li>
|
864 | <a href="https://www.nwoods.com/about.html">About Us</a>
|
865 | </li>
|
866 | <li>
|
867 | <a href="https://www.nwoods.com/contact.html">Contact Us</a>
|
868 | </li>
|
869 | <li>
|
870 | <a href="https://twitter.com/northwoodsgo">Twitter</a>
|
871 | </li>
|
872 |
|
873 | </ul>
|
874 | </li>
|
875 | </ul>
|
876 |
|
877 |
|
878 | <p class="text-sm text-gray-100 md:mb-6">
|
879 | Copyright 1998-2021 <a class="text-white" href="https://www.nwoods.com">Northwoods Software</a>
|
880 | </p>
|
881 | </div>
|
882 | </div>
|
883 | </footer> </body>
|
884 |
|
885 | <script async src="https://www.googletagmanager.com/gtag/js?id=UA-1506307-5"></script>
|
886 | <script>
|
887 | window.dataLayer = window.dataLayer || [];
|
888 | function gtag(){dataLayer.push(arguments);}
|
889 | gtag('js', new Date()); gtag('config', 'UA-1506307-5');
|
890 | var getOutboundLink = function(url, label) {
|
891 | gtag('event', 'click', {
|
892 | 'event_category': 'outbound',
|
893 | 'event_label': label,
|
894 | 'transport_type': 'beacon'
|
895 | });
|
896 | }
|
897 |
|
898 |
|
899 | var topButton = document.getElementById("topnavButton");
|
900 | var topnavList = document.getElementById("topnavList");
|
901 | topButton.addEventListener("click", function() {
|
902 | this.classList.toggle("active");
|
903 | topnavList.classList.toggle("hidden");
|
904 | document.getElementById("topnavOpen").classList.toggle("hidden");
|
905 | document.getElementById("topnavClosed").classList.toggle("hidden");
|
906 | });
|
907 | </script>
|
908 | <script src="../assets/js/prism.js"></script>
|
909 | <script src="../release/go.js"></script>
|
910 | <script src="../assets/js/goDoc.js"></script>
|
911 | <script>
|
912 | document.addEventListener("DOMContentLoaded", function() {
|
913 | if (window.go) document.getElementById('version').textContent = "GoJS version " + go.version;
|
914 | if (window.goDoc) window.goDoc();
|
915 | var d = window.diagrams;
|
916 | for (var i = 0; i < d.length; i++) {
|
917 | var dargs = d[i];
|
918 | goCodeExecute(dargs[0], dargs[1], dargs[2], dargs[3], dargs[4]);
|
919 | }
|
920 | if (window.extra) window.extra();
|
921 | });
|
922 | </script>
|
923 | </html>
|