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| import {
AfterViewInit,
Attribute,
Component,
ElementRef,
EventEmitter,
forwardRef,
Input,
Output,
ViewChild
} from '@angular/core';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
// rollup dirty fix : https://github.com/rollup/rollup/issues/1267
import * as jqueryProxy from 'jquery';
const jQuery: JQueryStatic = (<any> jqueryProxy).default || jqueryProxy
import 'selectize';
@Component({
selector: 'ng-selector',
template: `<select #selector></select>`,
providers: [{ provide: NG_VALUE_ACCESSOR, useExisting: forwardRef(() => NgSelectorComponent), multi: true }]
})
export class NgSelectorComponent implements AfterViewInit, ControlValueAccessor {
// select element
@ViewChild('selector') selector: ElementRef;
@Input() set readonly (disabled: boolean) {
this._disabled = disabled;
this.checkDisabled();
};
// array of data
@Input() set options (values: Array<any>) {
this.optionsChanged(values)
};
@Input() plugins = new Array<string>()
// async input options (function which provide data)
@Output() loadValues = new EventEmitter<{ query: string, result: (options: Array<any>) => void }>();
// rendering method to change display of item and options
@Output() renderer = new EventEmitter<{ val: any, html: (html: string) => void, type: string }>();
private _disabled = false;
// actual selectize component
selectize: any;
// keep data until tagsComponent is initialized
private data: any;
private tmpOptions: any;
private _mutiple = false
@Input('multiple')
get multiple () { return this._mutiple; }
set multiple (value) {
this._mutiple = value;
// this.selectize.maxItems = this.multiple ? null : 1,
Iif (this.selectize) this.selectize.maxItems = this.checkMultipleFalsy();
}
constructor (@Attribute('placeholder') public Iplaceholder = '',
@Attribute('id-field') public IidField = 'id',
@Attribute('label-field') public IlabelField = 'label',
@Attribute('allow-creation') public IallowCreation = true) {}
ngAfterViewInit (): any {
// initialize with default values
this.placeholder = this.placeholder || '';
this.idField = this.idField || 'id';
this.labelField = this.labelField || 'label';
this.multiple = this.multiple === undefined ? false : this.multiple;
this.allowCreation = this.allowCreation === undefined ? true : this.allowCreation;
let render;
Iif (this.renderer.observers.length === 1) {
render = {
option: this.rendering('option'),
item: this.rendering('item'),
};
}
// prepare selectize compatible method to fetch data
let load = null;
if (this.loadValues.observers.length === 1) {
load = (query: string, callback: (data: Array<any>) => void) => {
// TODO find a way to display it to user
// disabled async search if search string is below 3 characters long
Iif (query.length < 3) {
return callback([]);
}
this.loadValues.emit({ query, result: callback });
};
}
const plugins = [].concat(this.plugins)
// configure Selectize
this.selectize = jQuery(this.selector.nativeElement).selectize({
valueField: this.idField,
labelField: this.labelField,
searchField: this.labelField,
placeholder: this.placeholder,
maxItems: this.checkMultipleFalsy(),
create: this.allowCreation,
selectOnTab: true,
persist: true,
load: load,
render: render,
plugins: plugins,
onChange: this.dataChanged.bind(this)
} as Selectize.IOptions<any, any>)[0].selectize;
// force form-control on
jQuery(this.selector.nativeElement).siblings().find('.selectize-input').addClass('form-control');
// force refresh data when Selectize is initialized
this.optionsChanged(this.tmpOptions);
this.updateData(this.data);
this.checkDisabled();
}
optionsChanged (options) {
if (!options || !Object.keys(options).length) {
return this.selectize && this.selectize.clearOptions();
}
if (this.selectize) {
Object.keys(this.selectize.options).forEach(id => {
if (!options.find(elem => elem[this.idField] === this.selectize.options[id][this.idField])) {
this.selectize.removeOption(id);
}
});
// this.tagsComponent.options = options;
options.forEach(option => {
const value = option[this.idField];
// check if option exist to call the right method ... sorry ... -_-
if (this.selectize.options[value]) {
this.selectize.updateOption(value, option);
} else {
this.selectize.addOption(option);
}
});
this.selectize.refreshOptions(false);
} else {
this.tmpOptions = options;
}
}
dataChanged (value) {
Iif (!value || !value.length) {
return this.onChange(this.multiple ? [] : null);
}
if (this.multiple) {
const selectedValues = value
.map(id => this.selectize.options[id])
.filter(item => !!item)
.map(this.cleanOrder);
this.onChange(selectedValues);
} else {
this.onChange(this.cleanOrder(this.selectize.options[value]));
}
}
updateData (data) {
// component not initialized yet
Iif (!this.selectize) return;
if (!data) {
this.selectize.clear();
return;
}
this.selectize.addOption(data);
Iif (Array.isArray(data)) {
this.selectize.setValue(data.map(item => item[this.idField]));
} else Eif (data && typeof data === 'object') {
this.selectize.setValue(data[this.idField]);
}
}
checkDisabled () {
Iif (!this.selectize) return;
if (this._disabled === true) {
this.selectize.disable();
} else Eif (this._disabled === false) {
this.selectize.enable();
}
}
rendering (type) {
return i => {
let html = i[this.labelField];
this.renderer.emit({ val: i, html: htmlContent => html = htmlContent, type });
return html;
}
}
onChange = (_) => { };
onTouched = () => { };
writeValue (value: any): void {
this.updateData(value);
}
registerOnChange (fn: (_: any) => void): void {
this.onChange = fn;
}
registerOnTouched (fn: () => void): void {
this.onTouched = fn;
}
// function to clean object from selectize modifications
private cleanOrder (item: any) {
delete item.$order;
return item;
}
private checkMultipleFalsy () {
return (this.multiple) ? null : 1;
}
}
|