多次单击取消选中角材料垫单选按钮 [英] angular material mat radio button unchecked on multiple click

问题描述

如何清除第二次单击时选择的 (在它已经被选中之后)

How can I clear <mat-radio-button> selected on second click (after it is already selected)

我知道我可以使用复选框实现此行为，但我只需要允许选择一项.

I know I can implement this behavior with checkbox but i need to allow select only one item.

有什么帮助吗?

我的代码如下:

<mat-radio-group name="WasFamilyMemberPresent">
    <mat-radio-button *ngFor="let item of lookupNoYes" [value]="item.Code" >
       {{item.Desc}}
    </mat-radio-button>
</mat-radio-group>

推荐答案

您可以执行以下操作来完成此操作.

You can do the following to accomplish this.

为按钮#button分配一个模板引用并将其传递给组件方法(click)="checkState(button)"

Assign a template reference to the button #button and pass it to the component method (click)="checkState(button)"

 <mat-radio-button #button class="example-radio-button" *ngFor="let season of seasons" [value]="season" (click)="checkState(button)">

在组件中创建一个局部变量，用于存储checkState()

Create a local variable in the component to store the button value for comparison in checkState()

 currentCheckedValue = null;

DI Renderer2 从按钮上移除焦点

DI Renderer2 to remove focus from the button

 constructor(private ren: Renderer2) { }

在 setTimeout 中包装逻辑以将其置于摘要循环中，检查局部变量是否存在以及当前值是否等于参数值...如果为真取消选择，移除焦点和空局部变量...else 设置局部变量以备将来比较.

Wrap logic in setTimeout to put it on the digest cycle, check if local variable exist and if current value equals argument value... if true deselect, remove focus and null local variable... else set local variable for future comparison.

checkState(el) {
    setTimeout(() => {
      if (this.currentCheckedValue && this.currentCheckedValue === el.value) {
        el.checked = false;
        this.ren.removeClass(el['_elementRef'].nativeElement, 'cdk-focused');
        this.ren.removeClass(el['_elementRef'].nativeElement, 'cdk-program-focused');
        this.currentCheckedValue = null;
        this.favoriteSeason = null;
      } else {
        this.currentCheckedValue = el.value
      }
    })
  }

Stackblitz

https://stackblitz.com/edit/angular-c37tsw?embed=1&file=app/radio-ng-model-example.ts

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