Question

我在angular6中有一个带有电子邮件表单字段的表单。

电子邮件表单字段具有电子邮件验证，可在电子邮件无效时正确显示错误消息。但是，如果我单击“保存”按钮，该表格仍会保存。如何显示错误消息，但单击时不保存用户？

重要的要求是我不想禁用“保存”按钮。

user.component.html

<form method="post" enctype="multipart/form-data">
  <mat-form-field>
   <input matInput placeholder="Enter your Username" [(ngModel)]="userObj.userName" name="username" required>
  </mat-form-field>

  <mat-form-field>
    <input matInput placeholder="Enter your email" [formControl]="email" [(ngModel)]="userObj.emailid" name="emailid" required>
    <mat-error *ngIf="email.invalid">{{getErrorMessage()}}</mat-error>
  </mat-form-field>                   
</form>

<button mat-raised-button color="primary" (click)="saveNewUserDetails()">Save User</button>

user.component.ts

import {FormControl, Validators} from '@angular/forms';
email = new FormControl('', [Validators.required, Validators.email]);

getErrorMessage() {
  return this.email.hasError('required') ? 'You must enter a value' :
    this.email.hasError('email') ? 'Not a valid email' : '';
}

saveNewUserDetails(){
  if(this.userObj.userName.trim() != ''){
    const formData = new FormData();
      formData.append('username',this.userObj.userName);
      formData.append('emailid',this.userObj.emailid);
      this.userService.saveNewUserDetails(formData).subscribe(
       (data) => {
         console.log("user is saved successfully");
       }           
     )
   }
  }

Answer 1

在saveNewUserDetails()方法中，执行以下操作：

saveNewUserDetails() {
    if (this.email.invalid) {
      // Do Not submit
    } else {
      // Submit
    }
}

OR

我仍然建议将[disabled]="email.invalid"添加到您的按钮：

<button 
  mat-raised-button 
  [disabled]="email.invalid" 
  color="primary" 
  (click)="saveNewUserDetails()">
  Save User
</button>

Answer 2

如果您不想禁用“保存”按钮，但仍想阻止保存，则需要将该信息放入保存处理程序中。如果您只是希望按钮不起作用，则可以在模板中进行操作，如下所示：

<button mat-raised-button color="primary" (click)="email.valid && saveNewUserDetails()">Save User</button>

但是，如果您还想显示通知，请在课程中进行操作（通过按钮上的email.valid）：

<button mat-raised-button color="primary" (click)="saveNewUserDetails(email.valid )">Save User</button>

saveNewUserDetails(emailValid: boolean)
  if (!emailValid) {
    // show a notification or do something
    return;
  } 
  // otherwise all ok here, keep your logic.

角6中的电子邮件验证？

2 个答案: