浮动标签和占位符重叠

<div class="form-group form-default form-spacing">
     <input class="form-control" placeholder="Name" type="text" required>
     <span class="form-bar"></span>
     <label class="float-label">Name</label>
</div>

这是CSS，

.form-material {
    .form-group {
        position: relative;

        &.form-static-label .form-control {
            ~.float-label {
                top: -14px;
            }
        }
    }

    .form-control {

        &:focus {
            border-color: transparent;
            outline: none;
            box-shadow: none;

        }

        &:focus,
        &:valid {
            ~.float-label {
                top: -14px;
            }
        }
    }

如果我专注于文本字段，它就可以正常工作。 但当没有焦点时，它就会重叠。 阿斯达斯 阿斯达斯 阿斯达斯 阿斯达 达斯 达斯 阿斯达 达斯

请尝试这个：

npm install --save @Angular/Material @Angular/cdk @Angular/animations

在 app.module.ts 中：

import {MatFormFieldModule} from '@angular/material/form-field';

html:

<form [formGroup]="addressForm" novalidate (ngSubmit)="onSubmit()">
  <mat-card class="shipping-card">
    <mat-card-header>
      <mat-card-title>Address, Neighborhood or ZIP</mat-card-title>
    </mat-card-header>
    <mat-card-content>

      <div *ngIf="hasUnitNumber">
        <div class="col">
          <mat-form-field class="full-width">
            <textarea matInput placeholder="first Name" formControlName="firstName"></textarea>
          </mat-form-field>
        </div>
      </div>

    </mat-card-content>
    <mat-card-actions>
      <button mat-raised-button color="primary" type="submit">Submit</button>
    </mat-card-actions>
  </mat-card>
</form>

CSS:

.full-width {
  width: 100%;
}

.shipping-card {
  min-width: 120px;
  max-width: 620px;
  margin: 20px auto;
}

.mat-radio-button {
  display: block;
  margin: 5px 0;
}

.row {
  display: flex;
  flex-direction: row;
}

.col {
  flex: 1;
  margin-right: 20px;
}

.col:last-child {
  margin-right: 0;
}

打字稿组件：

export class MyFormComponent {

addressForm = this.fb.group({
    firstName: [null, Validators.required],
  });

hasUnitNumber = false;

constructor(private fb: FormBuilder) {}

  onSubmit() {
    alert('Thanks!');
  }
}