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angular5 - 聚焦后不能消失占位符

问题描述

在这里，我使用 Angular5 的登录表单使用角度材料表单。当应用程序启动时，登录表单占位符不能被覆盖。但是一旦我登录并注销，那么只有输入字段会被覆盖。截屏

<form [formGroup]="loginform" class="login-form">
  <mat-icon style="font-size: 30px ">account_circle</mat-icon>
  <mat-form-field class="example-full-width">
    <input matInput placeholder="Username" formControlName="userName">
  </mat-form-field>
  <br>
  <mat-icon style="font-size: 30px">lock_open</mat-icon>
  <mat-form-field>
    <input matInput placeholder="Enter your password" [type]="hide ? 'password' : 'text'" formControlName="password">
    <mat-icon matSuffix (click)="hide = !hide">{{!hide ? 'visibility' : 'visibility_off' }}</mat-icon>
  </mat-form-field>
  <button mat-raised-button color="primary" [disabled]="!loginform.valid" (click)="clicklogin();loginform.reset()">Login</button>
  <button mat-raised-button color="primary">cancel</button>
</form>



CSS File

 .login-form{
    top: 35%;
    border: 1px;
    border-style: double;
    position: absolute;
    width: 30%;
    border-radius: 5px;
    padding: 20px;
    left: 30%;
}
mat-form-field{
    width: 80%;
}
button{
    text-align: center;
    margin-left :17%;
}
mat-icon{
    float: left;
    line-height: 2;
    margin-right: 10px;
}

标签： angular5angular-material-5

解决方案

它对我来说工作正常。

.login-form{
    top: 35%;
    border: 1px;
    border-style: double;
    position: absolute;
    width: 30%;
    border-radius: 5px;
    padding: 20px;
    left: 30%;
}
mat-form-field{
    width: 80%;
}
button{
    text-align: center;
    margin-left :17%;
}
mat-icon{
    float: left;
    line-height: 2;
    margin-right: 10px;
}
<form [formGroup]="loginform" class="login-form">
  <mat-icon style="font-size: 30px ">account_circle</mat-icon>
  <mat-form-field class="example-full-width">
    <input matInput placeholder="Username" formControlName="userName">
  </mat-form-field>
  <br>
  <mat-icon style="font-size: 30px">lock_open</mat-icon>
  <mat-form-field>
    <input matInput placeholder="Enter your password" [type]="hide ? 'password' : 'text'" formControlName="password">
    <mat-icon matSuffix (click)="hide = !hide"></mat-icon>
  </mat-form-field>
  <button mat-raised-button color="primary" [disabled]="!loginform.valid" (click)="clicklogin();loginform.reset()">Login</button>
  <button mat-raised-button color="primary">cancel</button>
</form>

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