我嘗試實現用戶名字段的異步(isUnique)和同步(cannotContainSpace)驗證功能,我想看到「這個用戶名已經在使用alert msg,如果textbox的值是」yener「同步功能工作正常,但我認爲ss下面可以幫助解釋了我的問題;angular2異步驗證this.subscribe異常?
注:canNotContain同步驗證FUNC工作正常,aafter我加isUnique設置異步功能此異常發生..
我該如何解決
? usernamevalidator.ts
個import {FormControl} from '@angular/forms';
export class UsernameValidator{
static isUnique(control:FormControl){
return new Promise((resolve, reject)=>{
setTimeout(function(){
debugger
if(control.value =="yener")
resolve({isUnique:true})
else
resolve(null)
},1000);
});
}
static cannotContainSpace(control:FormControl){
if(control.value.indexOf(' ')>=0)
return { cannotContainSpace:true };
return null;
}
}
postmessage.component.ts
import { Component } from '@angular/core';
import {FormControl,FormGroup,FormBuilder,Validators} from '@angular/forms';
import {UsernameValidator} from '../../validators/usernamevalidator';
@Component({
moduleId:module.id,
selector: 'post-message',
templateUrl: '../../templates/postmessage.component.html'
})
export class PostComponent {
form : FormGroup;
constructor(fb:FormBuilder){
this.form = fb.group({
username:['', Validators.compose([Validators.required, UsernameValidator.cannotContainSpace]),Validators.compose([UsernameValidator.isUnique])],
email:['', Validators.required],
message:['', Validators.required]
});
}
signup(){
console.log(this.form.value);
}
}
這裏是HTML模板:
<form class="from-horizontal" [formGroup]="form" (ngSubmit)="signup()">
<div class="form-group row">
<label for="username" class="control-label col-md-2">Name:</label>
<div class="col-md-6">
<input type="text" id="username" class="form-control" formControlName="username">
<div *ngIf="form.controls['username'].touched && form.controls['username'].errors">
<div class="alert alert-danger"
*ngIf="form.controls['username'].errors.required">
User name is required.
</div>
<div class="alert alert-danger"
*ngIf="form.controls['username'].errors.cannotContainSpace">
User name can not contain space
</div>
<div class="alert alert-danger" *ngIf="form.controls['username'].errors.isUnique">
This user name already in use.
</div>
</div>
</div>...