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[(ngModel)] and default options #138

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111 changes: 89 additions & 22 deletions lib/ng2-select2.component.ts
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Original file line number Diff line number Diff line change
@@ -1,9 +1,12 @@
import {
AfterViewInit, ChangeDetectionStrategy, Component, ElementRef, EventEmitter, Input, OnChanges, OnDestroy,
Output, SimpleChanges, ViewChild, ViewEncapsulation, Renderer, OnInit
Output, SimpleChanges, ViewChild, ViewEncapsulation, Renderer, OnInit, forwardRef, SimpleChange, Optional
} from '@angular/core';

import { Select2OptionData } from './ng2-select2.interface';
import { ControlValueAccessor, NG_VALUE_ACCESSOR } from "@angular/forms";

import { Select2OptionData, Select2OptionInject, ValueChangedEmition } from './ng2-select2.interface';
import { Subscription } from 'rxjs';

@Component({
selector: 'select2',
Expand All @@ -13,9 +16,14 @@ import { Select2OptionData } from './ng2-select2.interface';
</ng-content>
</select>`,
encapsulation: ViewEncapsulation.None,
changeDetection: ChangeDetectionStrategy.OnPush
changeDetection: ChangeDetectionStrategy.OnPush,
providers: [{
provide: NG_VALUE_ACCESSOR,
useExisting: forwardRef(() => Select2Component),
multi: true
}]
})
export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, OnInit {
export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, OnInit, ControlValueAccessor {
@ViewChild('selector') selector: ElementRef;

// data for select2 drop down
Expand All @@ -37,34 +45,91 @@ export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, On
@Input() options: Select2Options;

// emitter when value is changed
@Output() valueChanged = new EventEmitter();
@Output() valueChanged: EventEmitter<ValueChangedEmition> = new EventEmitter<ValueChangedEmition>();

private element: JQuery = undefined;
private check: boolean = false;
private subs: Subscription[] = [];

constructor(private renderer: Renderer, @Optional() config: Select2OptionInject) {
if (config != null) this.options = config;
}

///////////////
// OVERRIDES //
///////////////

/**
* Invoked when the model has been changed
*/
onChange: (_: any) => void = (_: any) => { };

/**
* Invoked when the model has been touched
*/
onTouched: () => void = () => { };

firstChange: boolean = true;

/**
* Writes a new item to the element.
* @param value the value
*/
writeValue(value: string): void {

let change = new SimpleChange(this.value, value, this.firstChange);

this.value = value;
this.firstChange = false;

constructor(private renderer: Renderer) { }
this.ngOnChanges({
"value": change
});
}

/**
* Registers a callback function that should be called when the control's value changes in the UI.
* @param fn
*/
registerOnChange(fn: any): void {
this.onChange = fn;
}

/**
* Registers a callback function that should be called when the control receives a blur event.
* @param fn
*/
registerOnTouched(fn: any): void {
this.onTouched = fn;
}

ngOnInit() {
if(this.cssImport) {
if (this.cssImport) {
const head = document.getElementsByTagName('head')[0];
const link: any = head.children[head.children.length-1];
const link: any = head.children[head.children.length - 1];

if(!link.version) {
if (!link.version) {
const newLink = this.renderer.createElement(head, 'style');
this.renderer.setElementProperty(newLink, 'type', 'text/css');
this.renderer.setElementProperty(newLink, 'version', 'select2');
this.renderer.setElementProperty(newLink, 'innerHTML', this.style);
}

}

this.subs.push(this.valueChanged.subscribe(v => {
if (typeof this.onChange == 'function') {
this.onChange(v.value);
}
}));
}

async ngOnChanges(changes: SimpleChanges) {
if(!this.element) {
if (!this.element) {
return;
}

if(changes['data'] && JSON.stringify(changes['data'].previousValue) !== JSON.stringify(changes['data'].currentValue)) {
if (changes['data'] && JSON.stringify(changes['data'].previousValue) !== JSON.stringify(changes['data'].currentValue)) {
await this.initPlugin();

const newValue: string = this.element.val() as string;
Expand All @@ -74,7 +139,7 @@ export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, On
});
}

if(changes['value'] && changes['value'].previousValue !== changes['value'].currentValue) {
if (changes['value'] && changes['value'].previousValue !== changes['value'].currentValue) {
const newValue: string = changes['value'].currentValue;

this.setElementValue(newValue);
Expand All @@ -85,7 +150,7 @@ export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, On
});
}

if(changes['disabled'] && changes['disabled'].previousValue !== changes['disabled'].currentValue) {
if (changes['disabled'] && changes['disabled'].previousValue !== changes['disabled'].currentValue) {
this.renderer.setElementProperty(this.selector.nativeElement, 'disabled', this.disabled);
}
}
Expand All @@ -110,11 +175,13 @@ export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, On
if (this.element && this.element.off) {
this.element.off("select2:select");
}

for (let s of this.subs) if (s) s.unsubscribe();
}

private async initPlugin() {
if(!this.element.select2) {
if(!this.check) {
if (!this.element.select2) {
if (!this.check) {
this.check = true;
console.log("Please add Select2 library (js file) to the project. You can download it from https://github.com/select2/select2/tree/master/dist/js.");
}
Expand All @@ -128,14 +195,14 @@ export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, On
this.renderer.setElementProperty(this.selector.nativeElement, 'innerHTML', '');
}

let options: Select2Options = {
let options: any = {
data: this.data,
width: (this.width) ? this.width : 'resolve'
};

Object.assign(options, this.options);

if(options.matcher) {
if (options.matcher) {
let oldMatcher: any = await this.requireOldMatcher();
options.matcher = oldMatcher(options.matcher);
this.element.select2(options);
Expand All @@ -147,26 +214,26 @@ export class Select2Component implements AfterViewInit, OnChanges, OnDestroy, On
this.element.select2(options);
}

if(this.disabled) {
if (this.disabled) {
this.renderer.setElementProperty(this.selector.nativeElement, 'disabled', this.disabled);
}
}

private async requireOldMatcher() : Promise<any> {
private async requireOldMatcher(): Promise<any> {
return new Promise<any[]>(resolve => {
jQuery.fn.select2.amd.require(['select2/compat/matcher'], (oldMatcher: any) => {
resolve(oldMatcher);
});
});
}

private setElementValue (newValue: string | string[]) {
if(Array.isArray(newValue)) {
private setElementValue(newValue: string | string[]) {
if (Array.isArray(newValue)) {
for (let option of this.selector.nativeElement.options) {
if (newValue.indexOf(option.value) > -1) {
this.renderer.setElementProperty(option, 'selected', 'true');
}
}
}
} else {
this.renderer.setElementProperty(this.selector.nativeElement, 'value', newValue);
}
Expand Down
9 changes: 8 additions & 1 deletion lib/ng2-select2.interface.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,5 +7,12 @@ export interface Select2OptionData {
}

export interface Select2TemplateFunction {
(state: Select2OptionData): JQuery | string;
(state: Select2OptionData): string;
}

export class Select2OptionInject { }

export interface ValueChangedEmition {
value: string | string[];
data?: any;
}
14 changes: 12 additions & 2 deletions lib/ng2-select2.ts
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Original file line number Diff line number Diff line change
@@ -1,12 +1,22 @@
import { NgModule } from '@angular/core';
import { NgModule, ModuleWithProviders } from '@angular/core';

export { Select2OptionData, Select2TemplateFunction } from './ng2-select2.interface';
import { Select2Component } from './ng2-select2.component';
import { Select2OptionInject } from './ng2-select2.interface';

export { Select2Component } from './ng2-select2.component';

@NgModule({
declarations: [Select2Component],
exports: [Select2Component]
})
export class Select2Module {}
export class Select2Module {
static forRoot(config: any): ModuleWithProviders {
return {
ngModule: Select2Module,
providers: [
{ provide: Select2OptionInject, useValue: config }
]
};
}
}