我在我的Angular 4項目中使用自定義驗證器時,當我想更改密碼我有一個彈出式2字段:密碼和confirmpassword。 在這種情況下,這兩個字段都是必需的,當用戶刪除某些字段的內容時,正確顯示錯誤消息,字段變爲紅色。 但我怎麼能進行實地無效的,如果密碼不匹配(使紅色字段等所需用NG-無效/有錯誤)自定義驗證器角4
equalValidator.ts
import {Directive, forwardRef, Attribute} from '@angular/core';
import {Validator, AbstractControl, NG_VALIDATORS} from '@angular/forms';
@Directive({
selector: '[validateEqual][formControlName],[validateEqual][formControl],[validateEqual][ngModel]',
providers: [
{provide: NG_VALIDATORS, useExisting: forwardRef(() => EqualValidator), multi: true}
]
})
export class EqualValidator implements Validator {
constructor(@Attribute('validateEqual') public validateEqual: string,
@Attribute('reverse') public reverse: string) {
console.log('Sono in validator')
}
private get isReverse() {
if (!this.reverse) return false;
return this.reverse === 'true' ? true : false;
}
validate(c: AbstractControl): {[key: string]: any} {
// self value
let v = c.value;
// control vlaue
let e = c.root.get(this.validateEqual);
// value not equal
if (e && v !== e.value && !this.isReverse) {
return {
validateEqual: false
}
}
// value equal and reverse
if (e && v === e.value && this.isReverse) {
delete e.errors['validateEqual'];
if (!Object.keys(e.errors).length) e.setErrors(null);
}
// value not equal and reverse
if (e && v !== e.value && this.isReverse) {
e.setErrors({
validateEqual: false
})
}
return null;
}
}
password.html
<form #modelForm="ngForm"> <div class="form-group">
<label for="">Password</label>
<input type="password" class="form-control" name="password" [ngModel]="password"
required validateEqual="confirmPassword" reverse="true" #password="ngModel">
<small [hidden]="password.valid || password.pristine" class="text-danger">
Password is required
</small>
</div>
<div class="form-group">
<label for="">Retype password</label>
<input type="password" class="form-control" name="confirmPassword" [ngModel]="confirmPassword"
required validateEqual="password" reverse="false" #confirmPassword="ngModel">
<small [hidden]="confirmPassword.valid || confirmPassword.pristine " class="text-danger">
Password mismatch
</small>
</div> </form> <p-footer> <div class="ui-dialog-buttonpane ui-helper-clearfix"> <button class="btn btn-success" (click)="updatePassword(modelForm, oldPassword.value, password.value, confirmPassword.value)" [disabled]="((modelForm.form.invalid || modelForm.form.pristine)|| (password.value != confirmPassword.value))"> <span class="btn-label"> <i class="material-icons">check</i> </span> {{'changepassword.buttons.update' |translate }} </button> </div>
由於您使用的模板驅動的形式,你可以控制通過比較'password'和'confirmPassword'的值來隱藏不匹配的消息。 – Pengyy
@Pengyy我想在密碼不匹配時將字段設爲紅色,例如當需要字段時 – Alessandro