有什么方法可以通过单击外部按钮来扩展特定的垫子扩展面板？
我已尝试链接到面板的 ID，但没有成功...
<mat-expansion-panel id="panel1"> ... </>
...
<button (click)="document.getElementById('panel1').toggle()>Click me</button>
Here is my stackblitz code for example
我的最终计划是使用此方法在从数组生成的列表中打开不同的面板：<mat-expansion-panel *ngFor="let d of data"> ...
【问题讨论】：
标签： html angular angular-material
<mat-nav-list>
<mat-expansion-panel *ngFor="let row of rows" #mep="matExpansionPanel">
<mat-expansion-panel-header>
{{row}}
</mat-expansion-panel-header>
<h2>Test</h2>
<button (click)="mep.toggle()">Toggle</button>
</mat-expansion-panel>
</mat-nav-list>
工作示例： https://stackblitz.com/edit/mat-expansion-panel-vymjsq?file=app%2Fexpansion-overview-example.html
【讨论】：
你可以使用toggle()方法。
首先给元素一个id。
<mat-expansion-panel #matExpansionPanel>接下来，从 javascript 访问元素。导入必要的库（MatExpansionPanel、ViewChild）
@ViewChild(MatExpansionPanel, {static: true}) matExpansionPanelElement: MatExpansionPanel;最后，调用切换函数
this.matExpansionPanelElement.toggle(); //open(), close()【讨论】：
在您的 html 文件中：
<mat-expansion-panel [expanded]="panelOpenState">
<mat-expansion-panel-header>
<mat-panel-title>
TITLE
</mat-panel-title>
</mat-expansion-panel-header>
<p>BODY</p>
</mat-expansion-panel>
<button mat-raised-button (click)="togglePanel">TOGGLE</button>
在您的 TS 文件中：
panelOpenState: boolean = false;
togglePanel() {
this.panelOpenState = !this.panelOpenState
}
如果使用 *ngFor 生成扩展面板：
<mat-expansion-panel [expanded]="isOpen" *ngFor="let d of data">
<mat-expansion-panel-header>
{{ d.header }}
</mat-expansion-panel-header>
<p>{{ d.content }}</p>
</mat-expansion-panel>
<button mat-raised-button (click)="togglePanel">TOGGLE</button>
如果您按下按钮，所有展开的面板都会打开 同时。
要使用一个按钮只打开一个面板，请为每个元素的数据数组添加一个“扩展”属性，如下所示：
data = [
{id:1, header:'HEADER 1', content:'CONTENT 1', expanded: false},
{id:2, header:'HEADER 2', content:'CONTENT 2', expanded: false},
{id:3, header:'HEADER 3', content:'CONTENT 3', expanded: false},
{id:4, header:'HEADER 4', content:'CONTENT 4', expanded: false},
]
然后在你的模板中：
<mat-expansion-panel [(ngModel)]="d.expanded"
[expanded]="d.expanded" *ngFor="let d of data" ngDefaultControl>
<mat-expansion-panel-header>
<button (click)="toggle(d.expanded)">TOGGLE</button>
{{ d.header }}
</mat-expansion-panel-header>
<p>{{ d.content }}</p>
</mat-expansion-panel>
以及按钮点击引发的方法：
toggle(expanded) {
expanded = !expanded;
}
【讨论】：
html:
<mat-accordion >
<mat-expansion-panel #first="matExpansionPanel">
<mat-expansion-panel-header>
<mat-panel-title>...</mat-panel-title>
</mat-expansion-panel-header>
...
</mat-expansion-panel>
<mat-expansion-panel #second="matExpansionPanel" expanded="true">
<mat-expansion-panel-header>
<mat-panel-title>...</mat-panel-title>
</mat-expansion-panel-header>
...
</mat-expansion-panel>
</mat-accordion>
<button (click)="doSomething(first, second)">Click</button>
ts：
import { Component } from '@angular/core';
import { MatExpansionPanel } from '@angular/material';
@Component({
selector: 'app-home',
templateUrl: './home.component.html'
})
export class HomeComponent {
doSomething(first: MatExpansionPanel, second: MatExpansionPanel) {
if (first.expanded ) { // check if first panel is expanded
first.close(); // close first panel
second.open(); // open second panel
// ...
}
}
}
【讨论】：
<link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
<mat-accordion displayMode="flat" multi class="mat-table">
<section matSort class="mat-elevation-z8 mat-header-row">
<span class="mat-header-cell" mat-sort-header="vesselName"></span>
<span class="mat-header-cell" mat-sort-header="vesselName">d</span>
</section>
<mat-expansion-panel [disabled]="true" #mep="matExpansionPanel"
*ngFor="let d of data">
<mat-expansion-panel-header>
<span class="mat-cell" (click)="mep.expanded = !mep.expanded">
<mat-icon class="icon" *ngIf="!mep.expanded">expand_more</mat-icon>
<mat-icon class="icon" *ngIf="mep.expanded">expand_less</mat-icon>
</span>
<span (click)="dClicked(d)" class="mat-cell">{{d.dataSet}}</span>
</mat-expansion-panel-header>
<div><pre>{{d | json}}</pre></div>
</mat-expansion-panel>
<div class="well" *ngIf="!d || d.length == 0">
<p>There are no d for this.</p>
</div>
</mat-accordion>
【讨论】：
在 mat-expansion-panel 的 expanded 属性上使用双向绑定。这是 StackBlitz 中的一个示例：
https://stackblitz.com/edit/angular-gtsqg8
<button (click)='xpandStatus=xpandStatus?false:true'>Toggle it</button>
<p>
<mat-expansion-panel [(expanded)]="xpandStatus">
<mat-expansion-panel-header>
<mat-panel-title>This an expansion panel</mat-panel-title>
<mat-panel-description>xpandStatus is {{xpandStatus}}</mat-panel-description>
</mat-expansion-panel-header>
Two-way binding on the expanded attribute gives us a way to store and manipulate the expansion status.
</mat-expansion-panel>
</p>
【讨论】：
<mat-expansion-panel [disabled]="true"
#mep="matExpansionPanel"
*ngFor="let foo of list">
<mat-expansion-panel-header>
<button (click)="mep.expanded = !mep.expanded">Toggle</button>
</mat-expansion-panel-header>
<p>Text</p>
</mat-expansion-panel>
【讨论】：