如果条件允许，则阻止垫选项选择

问题描述

我想阻止 mat-option 被选中，因为点击它会打开一个对话框.只有在从对话框中选择某些内容时，才应该选择我的选项.如果对话框中没有选择任何内容，则 mat-option 不应更改为以前的值.

I want to prevent mat-option from being selected because clicking on it will open a dialog. Only when selecting something from the dialog, should my option be selected. If nothing was selected from the dialog, mat-option should not be changed from previous value.

<mat-select
        [(ngModel)]="filter_defaultSelectedValue"
        (change)="changeSelectedValue($event.value)">
   <mat-option *ngFor="let filter of filters" [value]="filter">
      <span *ngIf="filter.id != 'custom'; else content_dialog">
         {{filter.label | i18n}}
      </span>
      <ng-template #content_dialog>
         <dialog
            [filterParams] = "filter.value">
         </dialog>
      </ng-template>
   </mat-option>
</mat-select>

我的 mat-select 有以下选项:昨天"、今天"、明天"、自定义范围".例如，当我单击昨天"时，它只是被选中，但是当我单击自定义范围"时，会打开一个带有日历的对话框.如果我从日历中选择一个日期，对话框会关闭并且自定义范围"选项也被选中.当我关闭对话框而不从日历中选择任何内容时，自定义范围"选项将再次被选中.我不希望发生此选择，因为我没有从日历中选择任何内容.我该如何调节?

My mat-select has the following options: "yesterday", "today", "tomorrow", "custom range". For example when I click on "yesterday" it just gets selected, but when I click on "custom range" a dialog opens with a calendar. If I select a date from the calendar, dialog closes and the "custom range" option is selected as well. When I close the dialog without selecting anything from the calendar, "custom range" option gets selected again. I would not like this selection to happen since I didn't select anything from calendar. How can I condition this?

mat-options

推荐答案

通过更改 ngModel "filter_defaultSelectedValue" 代码，我设法调整了这种特殊情况.如果对话框内没有选择任何内容，ngModel 将设置为某个先前设置的值:

I've managed to condition this special case by changing in code the ngModel "filter_defaultSelectedValue".If inside the dialog nothing was selected, ngModel is set to some previously set value:

this.filter_defaultSelectedValue = this.lastSelection;

如果选择了对话框内的某些内容，那么我让 mat-select 将我的filter_defaultSelectedValue"更改为所选值.

If something inside dialog was selected, then I let mat-select change my "filter_defaultSelectedValue" to that selected value.

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