我正在监听组件中的 queryParam 更改,以便更新和保存活动行的状态。单击行突出显示一个,使用浏览器的后退按钮标记上一个。行为活动。到目前为止,一切都很好。但是还有 IE11 和 Safari。
当我在 IE 11 或 Safari 中使用浏览器后退按钮时,我的组件中的代码会被执行,但不会反映在 DOM 中。当我在 NgZone.run(callback) 回调函数中运行更改时,它会得到反映。
这是重现该行为的 Plunk :
import {Component} from '@angular/core'
import { Http, Response } from '@angular/http';
import {Router, ROUTER_DIRECTIVES} from '@angular/router';
@Component({
selector: 'list-component',
styles: [`
.isActive {
background: gray;
}
`],
template: `
<div class="debuggerBox">
Selected row index: {{ selectedIndex || 'none' }}
<br>
<div>Selected Item: {{ itemDetail | json }}</div>
</div>
<ul>
<li *ngFor="let item of listData; let i = index"
[class.isActive]="selectedIndex == item.index">
<a [routerLink]="['/']" [queryParams]="{selectedIndex: item.index}">Index {{item.index}}, Name {{item.name}}</a><br>
</li>
</ul>
`,
directives: [ROUTER_DIRECTIVES]
})
export class ListComponent {
listData: any = [
{index: 0, name: 'Item #0'},
{index: 1, name: 'Item #1'},
{index: 2, name: 'Item #2'},
{index: 3, name: 'Item #3'},
{index: 4, name: 'Item #4'}
];
selectedIndex: number;
itemDetail: any = {};
constructor(private http: Http, private router: Router) {
}
ngOnInit() {
this.router.routerState.queryParams.subscribe(params => {
if (params.hasOwnProperty('selectedIndex')) {
console.log('queryParams.selectedIndex change detected');
this.selectedIndex = params['selectedIndex'];
this.loadItemDetail(this.selectedIndex);
}
});
}
loadItemDetail(index) {
console.log('load item #' + index);
this.itemDetail = {};
this.itemDetail = this.listData[index];
console.log('loaded item #' + index);
}
}