Html MatSidenav中的角度材质UI错误:无法设置属性';固定端隙';未定义的
我试图使用angular 11创建一个angular material工具栏和sidenav。但是当我试图设置sidenav的属性时,如下图所示,它在中给出了以下错误。控制台,并导致第一个菜单列表项(mat nav list)未在初始页面加载中加载Html MatSidenav中的角度材质UI错误:无法设置属性';固定端隙';未定义的,html,angular,angular-material,angular11,Html,Angular,Angular Material,Angular11,我试图使用angular 11创建一个angular material工具栏和sidenav。但是当我试图设置sidenav的属性时,如下图所示,它在中给出了以下错误。控制台,并导致第一个菜单列表项(mat nav list)未在初始页面加载中加载 ERROR TypeError: Cannot set property 'fixedTopGap' of undefined at AppComponent.ngOnInit (app.component.ts:19) at callHook (c
ERROR TypeError: Cannot set property 'fixedTopGap' of undefined
at AppComponent.ngOnInit (app.component.ts:19)
at callHook (core.js:2535)
at callHooks (core.js:2506)
at executeInitAndCheckHooks (core.js:2457)
at refreshView (core.js:9433)
at renderComponentOrTemplate (core.js:9532)
at tickRootContext (core.js:10758)
at detectChangesInRootView (core.js:10783)
at RootViewRef.detectChanges (core.js:22751)
at ApplicationRef.tick (core.js:29491)
下面给出了我的app.component.ts
import { Component,ViewChild, HostListener, OnInit } from '@angular/core';
import { MatSidenav } from '@angular/material/sidenav';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent {
title = 'ui-material';
opened = true;
@ViewChild('sidenav') sidenav: MatSidenav;
ngOnInit() {
console.log(window.innerWidth)
if (window.innerWidth < 768) {
this.sidenav.fixedTopGap = 55;
this.opened = false;
} else {
this.sidenav.fixedTopGap = 55;
this.opened = true;
}
}
@HostListener('window:resize', ['$event'])
onResize(event:any) {
if (event.target.innerWidth < 768) {
this.sidenav.fixedTopGap = 55;
this.opened = false;
} else {
this.sidenav.fixedTopGap = 55
this.opened = true;
}
}
isBiggerScreen() {
const width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
if (width < 768) {
return true;
} else {
return false;
}
}
从'@angular/core'导入{Component,ViewChild,HostListener,OnInit};
从'@angular/material/sidenav'导入{MatSidenav};
@组成部分({
选择器:'应用程序根',
templateUrl:“./app.component.html”,
样式URL:['./app.component.css']
})
导出类AppComponent{
标题='用户界面材料';
开放=真;
@ViewChild('sidenav')sidenav:MatSidenav;
恩戈尼尼特(){
console.log(window.innerWidth)
如果(窗内宽度<768){
this.sidenav.fixedTopGap=55;
this.opened=false;
}否则{
this.sidenav.fixedTopGap=55;
this.opened=true;
}
}
@HostListener('窗口:调整大小',['$event']))
onResize(事件:任意){
如果(event.target.innerWidth<768){
this.sidenav.fixedTopGap=55;
this.opened=false;
}否则{
this.sidenav.fixedTopGap=55
this.opened=true;
}
}
isBiggerScreen(){
常量宽度=window.innerWidth | | document.documentElement.clientWidth | | document.body.clientWidth;
如果(宽度<768){
返回true;
}否则{
返回false;
}
}
app.component.html
<mat-toolbar color="primary" class="header">
<div>Organization Services</div>
<span class="nav-tool-items">
<mat-icon (click)="sidenav.toggle()" class="hamburger">menu</mat-icon>
</span>
</mat-toolbar>
<mat-sidenav-container autosize>
<mat-sidenav #sidenav [mode]="isBiggerScreen() ? 'over' : 'side'" [(opened)]="opened" [fixedInViewport]="true"
[fixedTopGap]>
<mat-nav-list>
<a mat-list-item routerLinkActive="active" routerLink="/search">
<mat-icon>search</mat-icon> Search
</a>
<a mat-list-item routerLinkActive="active" routerLink="/unit">
<mat-icon>add_business</mat-icon>Unit
</a>
<a mat-list-item routerLinkActive="active" routerLink="/add">
<mat-icon>person</mat-icon> Add
</a>
</mat-nav-list>
</mat-sidenav>
<mat-sidenav-content>
<router-outlet></router-outlet>
</mat-sidenav-content>
</mat-sidenav-container>
组织服务
菜单
搜索
添加业务单元
人加
好的,我在angular 11中找到了解决方案,更改了视图子项的sidenav声明,如下所示
@ViewChild('sidenav',{static:true}) sidenav: MatSidenav;
如果您找到更好的方法,请告诉我:)