Angular 角度4“;无法读取属性';切换';“未定义”的定义;使用*ngIf=";sidemenuu==true";侧边菜单
angular 4“在使用*ngIf=“sidemenuu==true”到侧菜单时无法读取未定义的属性“toggle” side-menu.htmlAngular 角度4“;无法读取属性';切换';“未定义”的定义;使用*ngIf=";sidemenuu==true";侧边菜单,angular,angular-material,Angular,Angular Material,angular 4“在使用*ngIf=“sidemenuu==true”到侧菜单时无法读取未定义的属性“toggle” side-menu.html <button mat-icon-button (click)="snav.toggle()" value="sidebarclosed"> <mat-icon>menu</mat-icon> </button> <span fxFlex></span> <app-hea
<button mat-icon-button (click)="snav.toggle()" value="sidebarclosed">
<mat-icon>menu</mat-icon>
</button>
<span fxFlex></span>
<app-header></app-header>
</mat-toolbar>
<mat-sidenav-container class="example-sidenav-container"
[style.marginTop.px]="mobileQuery.matches ? 0 : 0">
<mat-sidenav #snav id="snav" class="dark-sidebar pl-xs"
[mode]="mobileQuery.matches ? 'side' : 'over'" fixedTopGap="0"
[opened]="mobileQuery.matches" [disableClose]="mobileQuery.matches"
*ngIf="sidemenuu == true" >
<app-sidebar ></app-sidebar>
</mat-sidenav>
<mat-sidenav-content class="page-wrapper">
<div class="page-content">
<router-outlet>
<app-spinner></app-spinner>
</router-outlet>
</div>
</mat-sidenav-content>
</mat-sidenav-container>
这是我为其他路径得到的错误
错误
SideMenuComponent.html:40错误类型错误:无法读取的属性“toggle”
未定义
at Object.eval [as handleEvent] (SideMenuComponent.html:40)
at handleEvent (core.js:13589)
at callWithDebugContext (core.js:15098)
at Object.debugHandleEvent [as handleEvent] (core.js:14685)
at dispatchEvent (core.js:10004)
at eval (core.js:10629)
at HTMLButtonElement.eval (platform-browser.js:2628)
at ZoneDelegate.invokeTask (zone.js:421)
at Object.onInvokeTask (core.js:4751)
at ZoneDelegate.invokeTask (zone.js:420)
由于按钮位于mat sidenav容器的“外部”,因此可以使用ViewChild
//In component.ts
@ViewChild('sidenav') sidenav:any;
toggleSidenav()
{
this.sidenav.toggle();
console.log(this.sidenav.toggle);
}
//In your .html
<button mat-icon-button (click)="toggleSidenav()" value="sidebarclosed">
//在component.ts中
@ViewChild(“侧导航”)侧导航:任何;
toggleSidenav()
{
this.sidenav.toggle();
log(this.sidenav.toggle);
}
//在你的.html文件中
对于那些将跟进此问题的人,添加到您的组件中。ts将解决此错误
@ViewChild(“侧导航”)侧导航:任何 这可能是Viewchild的问题。。。有时viewchild需要两个参数。。 在这种情况下,您可以使用此
@ViewChild('blabla', {static: false})
这是因为
snav
未定义,你在哪里初始化它?你救了我一天!
@ViewChild('blabla', {static: false})