垫子扩展面板是默认打开的bug? [英] Mat expansion panel is opened by default bug?

问题描述

自从 Angular 5 发布以来，我的垫子扩展面板出现了一些问题.它们默认打开，我不明白为什么.

我的 html

<div *ngFor="let block of blocks; let i = index;"><mat-expansion-panel *ngIf="selectedIndex == 2" (closed)="onClosed(i)" (opened)="onOpened(i)" [expanded]="expansionPanelIndex === i"><mat-expansion-panel-header><mat-panel-title>....</mat-panel-title><mat-panel-description>...</mat-panel-description></mat-expansion-panel-header></mat-expansion-panel>

在我的组件中

 tabChanged(tabChangeEvent: MatTabChangeEvent): void {this.selectedIndex = tabChangeEvent.index;}onOpened(i) {this.expansionPanelIndex = i;}onClosed(i) {this.expansionPanelIndex = -1;}

我将 Material 更新为 5.1.1 同样的问题编辑 2:我的标签组中有一个selectedTabIndex"

...<垫子扩展面板...></mat-expansion-panel></mat-tab-group>

这里的双向绑定不是一个好主意.但是现在，我有另一个问题(单击 nextStep 按钮不执行任何操作)

解决方案

我终于找到了问题.

是关于这个的:*ngIf="selectedIndex == 2".我用一个布尔值替换它，当我更改选项卡时更新它(MatTabChangeEvent)

 tabChanged( tabChangeEvent: MatTabChangeEvent ): void {this.selectedIndex = tabChangeEvent.index;如果(this.selectedIndex == 2){this.displayBlock = true;}别的 {this.displayBlock = false;}}

Since Angular 5 release, I have some problem with my mat expansion panels. They are opened by default and I don't understand why.

my html

<div *ngFor="let block of blocks; let i = index;">
<mat-expansion-panel *ngIf="selectedIndex == 2" (closed)="onClosed(i)" (opened)="onOpened(i)" [expanded]="expansionPanelIndex === i">
    <mat-expansion-panel-header>
        <mat-panel-title>
           ....
        </mat-panel-title>
        <mat-panel-description>
           ...
        </mat-panel-description>
     </mat-expansion-panel-header>
</mat-expansion-panel>
</div>
        

in my component

    tabChanged(tabChangeEvent: MatTabChangeEvent): void {
        this.selectedIndex = tabChangeEvent.index;
    }

    onOpened(i) {
        this.expansionPanelIndex = i;
    }

    onClosed(i) {
      this.expansionPanelIndex = -1;
    }

EDIT : I updated Material to 5.1.1 same problem EDIT 2 : I had a "selectedTabIndex" in my tab-group

<mat-tab-group [(selectedIndex)]="selectedIndex" (selectedTabChange)="tabChanged($event)">
...
<mat-expansion-panel ...>
</mat-expansion-panel>
</mat-tab-group>

The two way binding wasn't a good idea here. But now, I have another problem (click on nextStep button doesn't do anything)

解决方案

I finally found the problem.

It was about this : *ngIf="selectedIndex == 2". I replaced it by a boolean which is updated when I change tab (MatTabChangeEvent)

    tabChanged( tabChangeEvent: MatTabChangeEvent ): void {
        this.selectedIndex = tabChangeEvent.index;

        if (this.selectedIndex == 2) {
            this.displayBlock = true;
        }
        else {
            this.displayBlock = false;
        }
    }

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