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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 | 29x 29x 29x 29x 29x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 12x 8x 8x 12x 2x 2x 2x 2x 12x 12x 12x 1x 1x 1x 1x 1x 1x 1x 1x 1x 12x 1x 1x 2x 11x 12x 14x 12x 9x 9x 9x 1x 3x 16x 21x | import { customAttribute } from '../decorator/exported';
import { IAttribute, IListener, IBindingContext } from '../interface/exported';
import { ViewController, View, AttributeController } from '../view/exported';
import { BindingEngine } from '../binding/exported';
import { DOM } from '../utils/exported';
/**
* removes dom when expression is undefined/null''0
*
*/
@customAttribute('if.bind')
export class IfAttribute implements IAttribute {
public $element: HTMLElement;
public $attribute: Attr;
public $bindingContext: IBindingContext;
public $controller: AttributeController;
private value: string | null | undefined;
private elementClone: Node;
private anchor: Node;
private added: boolean;
private subscribeCall: IListener;
private $view: ViewController;
private templateElement: boolean;
private childNodes: Node[];
private $templateView: ViewController;
/**
* created
*
*/
public created() {
// get current value;
this.value = this.$attribute.value;
// remove the if.bind attribute
this.$element.attributes.removeNamedItem('if.bind');
this.$view = this.$controller.getView();
// clone node, we need this clone later when we add it
this.elementClone = this.$element.cloneNode(true);
this.templateElement = (this.elementClone as any).tagName === 'TEMPLATE' ? true : false;
// hide it for now, we will remove it when we are attached to parent
this.$element.style.display = 'None';
// set variable for later
this.added = false;
}
/**
* attached
*
*/
public attached() {
// create anchor so where know where to inject it
// this needs to be after we attched it since we need parentNode to do this
this.anchor = DOM.document.createComment('mf-if-bind');
// add anchor
this.$element.parentNode.insertBefore(this.anchor, this.$element);
// remove main element
this.remove();
this.subscribeCall = {
name: 'ifAttribute',
value: this.value,
call: (newValue: any) => {
switch (true) {
case newValue && !this.added:
this.added = true;
this.add();
break;
case !newValue && this.added:
this.remove();
break;
}
}
} as IListener;
BindingEngine.subscribeClassProperty(this.$bindingContext, this.value, this.subscribeCall);
}
/**
* detached
*
*/
public detached(): void {
BindingEngine.unSubscribeClassProperty(this.$bindingContext, this.subscribeCall);
this.remove();
if (this.anchor) {
this.anchor.parentNode.removeChild(this.anchor);
this.anchor = null;
}
}
/**
* shows element/content
*
*/
public add() {
// create clone
const template = this.elementClone.cloneNode(true);
if (this.templateElement) {
// IE11
if (!(<any>template).content) {
(<any>template).content = DOM.document.createDocumentFragment();
while (template.childNodes[0]) {
(<any>template).content.appendChild(template.childNodes[0]);
}
}
}
// set clone as current element
this.$element = (template as any);
let temp: any;
this.$templateView = new ViewController(template, this.$view);
if (this.templateElement) {
temp = DOM.document.createElement('div');
temp.appendChild((template as any).content);
this.childNodes = [];
let anchor = DOM.document.createComment('ifbind-template-anchor-start');
this.childNodes.push(anchor);
for (let i = 0, ii = temp.childNodes.length; i < ii; i++) {
this.childNodes.push(temp.childNodes[i]);
}
anchor = DOM.document.createComment('ifbind-template-anchor-end');
this.childNodes.push(anchor);
}
// get attach event for elements
let controllers = View.parseTemplate(this.templateElement ? temp : this.$element, this.$bindingContext, this.$templateView);
if (this.templateElement) {
this.anchor.parentNode.insertBefore(this.childNodes[0], this.anchor);
for (let i = 1, ii = this.childNodes.length; i < ii; i++) {
this.anchor.parentNode.insertBefore(this.childNodes[i], this.childNodes[i - 1].nextSibling);
}
} else {
this.anchor.parentNode.insertBefore(this.$element, this.anchor);
}
// if this even used after last rebuild?
controllers.forEach((x) => {
if (x.attached) {
x.attached();
}
});
controllers = null;
}
/**
* removes content
*
*/
private remove() {
if (this.added) {
this.added = false;
this.$templateView.clearView();
this.$templateView = null;
}
if (this.$element) {
if (this.templateElement && this.childNodes) {
for (let i = 0, ii = this.childNodes.length; i < ii; i++) {
if (this.childNodes[i].parentNode === this.anchor.parentNode) {
this.anchor.parentNode.removeChild(this.childNodes[i]);
}
}
} else {
if (this.anchor.parentNode === this.$element.parentNode) {
this.anchor.parentNode.removeChild(this.$element);
}
}
this.$element = null;
}
}
}
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