我正在尝试根据所选的单选按钮运行表单验证器,因此如果选择了 Instagram,则运行一个验证器,如果选择了 facebook,则运行另一个验证器。我的组件模板如下:
<div class="form-group" [ngClass]="{ 'has-error' : !requestURL.valid && submitAttempt }">
<div class="radio">
<label for="instagram">
<input type="radio"
name="socialmedia"
id="instagram"
value="instagram"
[checked]="selectedSourceType === 'instagram'"
(click)="updateSelectedSourceType('instagram')">
<i class="fa fa-instagram"></i>
</label>
<label for="facebook">
<input type="radio"
name="socialmedia"
id="facebook"
value="facebook"
[checked]="selectedSourceType === 'facebook'"
(click)="updateSelectedSourceType('facebook')">
<i class="fa fa-facebook"></i>
</label>
</div>
<label for="requestSource">Submit URL</label>
<span *ngIf="requestURL.hasError('alreadyTracked')" class="already-following">Already Following This User</span>
<input type="text"
id="requestSource"
class="form-control"
placeholder="Enter a website, Facebook Page or Instagram handle"
ngControl="requestURL">
因此,单击时将切换 selectedSourceType,并且该值应确定运行哪个验证器。然而,由于构造函数的原因,运行时的原始值是运行的验证器,即使选择了另一个单选按钮也是如此。有人对此有任何可能的解决方案吗?这是我的类(class)的内容,验证器现在只是一个字符串检查,并且单独按预期工作:
theForm: ControlGroup;
requestURL: Control;
submitAttempt: boolean = false;
isLoading: boolean = false;
selectedSourceType:string = 'facebook';
validationUrls = {
instagram: 'post-ig-url?src=',
facebook: 'post-fb-url?src='
}
constructor(private _applicationService:AppService,
private _elRef:ElementRef,
private _router:Router,
private _http:Http,
private _builder:FormBuilder) {
super(_elRef, _applicationService, _router);
this.createRequestURLControl(CustomValidators.facebookURL);
this.theForm = _builder.group({
requestURL: this.requestURL
});
}
requestSource(form){
console.log('Selected source:', this.selectedSourceType);
this.isLoading = true;
this.submitAttempt = true;
let sub = this._http.post(this.validationUrls[this.selectedSourceType] + form.requestURL, '')
.subscribe(data => {
console.log("URL Submitted for review", data);
this.isLoading = false;
}, error => {
console.info(error.json().message);
});
this.addSubscription(sub);
}
createRequestURLControl(validator:any) {
this.requestURL = new Control('', Validators.compose([validator, Validators.required]) );
}
updateSelectedSourceType(sourceType:string) {
this.selectedSourceType = sourceType;
// update validators
if (sourceType === 'facebook') {
this.createRequestURLControl(CustomValidators.facebookURL);
} else {
this.createRequestURLControl(CustomValidators.instagramURL);
}
// clear input
}
最佳答案
只需将验证器设置为组件的方法,或当前作用域中的闭包,以便它可以访问组件的值。
class MyComponent {
someValidator(c:Control) {
if(this.radio...) {
...
}
}
createRequestURLControl(validator:any) {
this.requestURL = new Control('', Validators.compose([(c:Control) => this.someValidator(c), Validators.required]) );
}
}
我没有调查您想要有条件的确切验证器或如何评估条件,但您应该明白。
重要的是使用 ()=>
,以便 this
在验证器方法内继续工作。
关于javascript - Angular2 条件表单验证器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/37996702/