当只有一个条件为真时，两个mat错误都会显示。
当只有一个条件为真时，两个mat错误都会显示。
提问于 2019-07-03 18:34:01
当只出现一个错误时，两个mat错误都会显示出来。
我正在尝试使用mat错误来定制验证器。当电子邮件和确认密码的真实值为hasError(‘)时，它们都是红色的。
我认为我的MyErrorStateMatcher类逻辑是错误的。请帮帮我！我已经尽我所能了。提前谢谢你！
就像你在图像中看到的。当confirmPassword抛出错误时，电子邮件字段也是红色的。
我的ErrorStateMatcher：
export class MyErrorStateMatcher implements ErrorStateMatcher {
isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
const invalidCtrl = !!(control && control.invalid && (control.dirty || control.touched));
const invalidParent = !!(control && (control.parent.hasError('notTheSame') || control.parent.hasError('emailUsed')));
return ((invalidCtrl || invalidParent));
}
}HTML：(关注电子邮件和confimPassword)
<form [formGroup]="signupForm" (ngSubmit)="signup(signupForm)">
<mat-form-field style="width: 100%;">
<input matInput formControlName="email" placeholder="Email address" type="email" [errorStateMatcher]="matcher" required>
<mat-error *ngIf="signupForm.controls.email.hasError('required')">Email required!</mat-error>
<mat-error *ngIf="signupForm.controls.email.hasError('email')">Email invalid!</mat-error>
<mat-error *ngIf="signupForm.hasError('emailUsed')">This email already exists!</mat-error>
</mat-form-field>
<mat-form-field style="width: 100%;">
<input matInput formControlName="username" placeholder="User name" (blur)="signupForm.value.username != null ? isValidUsername(signupForm.value.username) : ''" required />
<mat-error>Please enter your new username!</mat-error>
<mat-error *ngIf="usernameInvalid">Username already exists!</mat-error>
</mat-form-field>
<mat-form-field style="width: 100%;">
<input matInput formControlName="password" placeholder="New password" [type]="show ? 'text' : 'password'" required />
<mat-icon matSuffix (click)="show = !show" style="cursor: pointer;">{{show ? 'visibility' : 'visibility_off'}}</mat-icon>
<mat-error>Please enter your password!</mat-error>
</mat-form-field>
<mat-form-field style="width: 100%;">
<input matInput formControlName="confirmPassword" placeholder="Confirm password" type="password" [errorStateMatcher]="matcher" required>
<mat-error *ngIf="signupForm.controls.confirmPassword.hasError('required')">Please confirm your password!</mat-error>
<mat-error *ngIf="signupForm.hasError('notTheSame') && signupForm.value.confirmPassword != ''">Password is not the same!</mat-error>
</mat-form-field>
<br>
<button mat-raised-button class="sessionBtn" color="primary" [disabled]="signupForm.invalid">Submit!</button>
</form>TS：
signupForm = new FormGroup({
firstName: new FormControl(),
lastName: new FormControl(),
email: new FormControl('', [
Validators.required,
Validators.email
]),
username: new FormControl(),
password: new FormControl('', [
Validators.required
]),
confirmPassword: new FormControl('', [
Validators.required
])
}, { validators: [this.checkPassword, this.checkExistingEmail] });
matcher = new MyErrorStateMatcher();
/////////Custom validator////////
checkPassword(signupForm: FormGroup) {
let password = signupForm.value.password;
let confirmPassword = signupForm.value.confirmPassword;
return password === confirmPassword ? null : { notTheSame: true };
}
checkExistingEmail(signupForm: FormGroup) {
let inputEmail = signupForm.value.email;
let dbEmail = "test@test.com";
return inputEmail !== dbEmail ? null: { emailUsed: true };
}错误发生在输入电子邮件和输入confirmPassword，两者都有[errorStateMatcher]="matcher"。
回答 2
Stack Overflow用户
回答已采纳
发布于 2019-07-04 17:34:07
创建customErrorMatcher
如果我们想在<mat-form-field>中显示一个错误，当input是有效的时，我们使用customErrorMatcher。
这是一个类似于
class CrossFieldErrorMatcher implements ErrorStateMatcher {
isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
//when we want to show the error
return true
//when we want not show the error
return false
}
}正常情况下，我们有我们的组件
errorMatcher=new CrossFieldErrorMatcher()
//and the .html
<mat-form-field>
<input matInput formControlName='verifyPassword'
[errorStateMatcher]="errorMatcher">
<mat-error *ngIf="....">
Passwords do not match!
</mat-error>
</mat-form-field>嗯，我们要稍微改变一下，在我们的customErrorMatcher中添加一个构造函数
class CrossFieldErrorMatcher implements ErrorStateMatcher {
constructor(private name:string){} //<--add a constructor
isErrorState(control: FormControl | null, form: FormGroupDirective | NgForm | null): boolean {
//when we want to show the error, but we can use "name"
return true
//when we want not show the error
return false
}
}然后，我们的组件变成
errorMatcher(name:string)
{
return new CrossFieldErrorMatcher(name);
}
//and the .html
<mat-form-field>
<input matInput formControlName='verifyPassword'
[errorStateMatcher]="errorMatcher('password')">
<mat-error *ngIf="....">
Passwords do not match!
</mat-error>
</mat-form-field>Stack Overflow用户
发布于 2019-07-03 20:03:02
email address字段显示一个错误，因为错误状态匹配器检查父--即表单--这是错误的，因为密码字段不匹配。您需要对电子邮件字段和密码字段使用不同的错误状态匹配器，因为条件不同--如果密码字段不匹配，则电子邮件不需要出错。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/56876119
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