Question

当我想隐藏或显示离子1中的div时，我曾经使用过ngshow。

我正在使用离子3，如果indexCount == 0，我试图让按钮什么都不做（没有点击事件）。

我目前有......

<div ng-if=" indexCount == 0">
<button ion-button class="previous"> Previous </button>

<div ng-if=" indexCount != 0">
 <button ion-button class="next" (click)="previousButtonClick"> Next 
</button>

Answer 1

I think that you want to disable or hide the 'previous' button on the page with indexCount == 0 and disable/hide 'next' button on the last page indexCount == length - 1 where length is the number of pages.

You can either disable a button for consistent layout

<button [disabled]="indexCount == 0" ion-button class="previous">Previous</button>
<button [disabled]="indexCount >= length - 1" ion-button class="next" (click)="previousButtonClick()">Next</button>

or remove it with *ngIf

<button *ngIf="indexCount != 0" ion-button class="previous">Previous</button>
<button *ngIf="indexCount < length - 1" ion-button class="next" (click)="previousButtonClick()">Next</button>

Note that [disabled] prevents click events firing.

Answer 2

从Angular2开始，您需要使用*ngIf，您可以看到示例here。
示例：

<div *ngIf=" indexCount == 0"> <button ion-button class="previous"> Previous </button> </div> <div *ngIf=" indexCount != 0"> <button ion-button class="next" (click)="previousButtonClick"> Next </button> </div>

Answer 3

对于这种情况，您还可以使用ng-template.

<强>例：

<ng-template #thenTemplateClick>
  <button ion-button class="next" (click)="previousButtonClick()">
    Next 
  </button>
</ng-template>

<ng-template #elseTemplateClick>
  <button ion-button class="previous"> Previous </button>
</ng-template>

Answer 4

另一种方法是在.ts文件中添加按钮功能的条件。在模板文件中：

<button ion-button (click)='myButtonAction()>Previous</button>

在.ts文件中：

    myButtonAction(){
        if(this.indexCount == 0){
             console.log('No Action');
        } else {
             // Previous Button Desired Action
             // eg NavCtrl action or change value to trigger *ngIf update etc
        }
    }

在Ionic中使用ngIF 3

4 个答案: