Detailed explanation of the implementation method of a complete Angular4 FormText component-JS Tutorial-php.cn

This article mainly introduces how to write a complete Angular4 FormText component. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.

Component definition

import { Component, Output, Input, forwardRef, EventEmitter} from '@angular/core'; import {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms'; @Component({ selector: 'form-text', template: `  {{label}}：  
 `, providers: [ { provide:NG_VALUE_ACCESSOR, useExisting:forwardRef(()=>FormTextComponent), multi:true } ] }) export class FormTextComponent implements ControlValueAccessor { @Input() label:string = ''; @Input() placeholder: string=''; @Output() onChange: EventEmitter = new EventEmitter(); public innerValue: any; public changeFn: Function = () => {}; get value(): any { return this.innerValue; }; set value(v: any) { if (v !== this.innerValue) { this.innerValue = v; this.changeFn(v); } } writeValue(value: any) { if (value !== this.innerValue) { this.innerValue = value; } } registerOnChange(fn: any) { this.changeFn = fn; } registerOnTouched(fn: any) { // } }

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Component usage

 {{mobile}}

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Points to note:

Providers of the component need to be configured

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