我从index.html中的url中删除了查询参数,但是我希望在app.component.html中使用这些查询参数,并使用ActivatedRoute处理我的app.component.ts, 现在,当我在index.html中拥有此脚本时,我的app.componen.ts也不会收到那些队列参数,如何让app.component.ts具有查询参数?
这是我index.html中的脚本,用于删除查询参数:
<script type="text/javascript">
var url = window.location.toString();
if(url.indexOf("?") > 0) {
var sanitizedUrl = url.substring(0, url.indexOf("?"));
window.history.replaceState({}, document.title, sanitizedUrl);
}
</script>
这是解析查询参数的我的app.component.ts:
import {ApiService} from './api.service';
import {Component, OnInit} from '@angular/core';
import {ActivatedRoute, Router} from '@angular/router';
import {Converter} from './converter';
import {Title} from '@angular/platform-browser';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
username = '';
department = '';
json;
constructor(
private feedbackService: ApiService,
private titleService: Title,
private route: ActivatedRoute
) {
}
ngOnInit() {
this.route.queryParams.subscribe(params => {
if (params.hasOwnProperty('username')) {
this.username = params['username'];
}
if (params.hasOwnProperty('department')) {
this.department = params['department'];
}
});
}
答案 0 :(得分:3)
您不仅可以将这些查询参数放入会话存储中,然后访问app.component.ts中的会话存储吗?
<script type="text/javascript">
var url = window.location.toString();
if(url.indexOf("?") > 0) {
var [ sanitizedUrl, queryParams ] = url.split('?')
window.history.replaceState({}, document.title, sanitizedUrl);
sessionStorage.setItem('params', queryParams)
}
</script>
//app.component.ts
export class AppComponent implements OnInit {
username = '';
department = '';
json;
constructor(
private feedbackService: ApiService,
private titleService: Title,
private route: ActivatedRoute
) {
}
ngOnInit() {
let params = sessionStorage.getItem('params');
// parse params logic here //
if (params.hasOwnProperty('username')) {
this.username = params['username'];
}
if (params.hasOwnProperty('department')) {
this.department = params['department'];
}
};
}
答案 1 :(得分:1)
经过研究,目前尚无明确的解决方案,但我确实设法创建了一些可行的解决方案。
要使其有效,其背后的想法是使查询参数保持服务状态。
提供将保留数据的服务:
import { Injectable } from '@angular/core';
import { BehaviorSubject, Observable } from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class SampleService {
data: BehaviorSubject<any> = new BehaviorSubject({});
data$: Observable<any> = this.data.asObservable();
}
然后,在您的app.component.ts
constructor(
private activatedRoute: ActivatedRoute,
private router: Router,
private sampleService: SampleService
) {}
ngOnInit(): void {
this.sampleService.data$.subscribe(console.log);
this.activatedRoute.queryParams.subscribe((data: {username: string, departure: string}) => {
if(data.hasOwnProperty('username') || data.hasOwnProperty('departure')) {
this.sampleService.data.next(data);
}
setTimeout(() => { // note this timeout is mandatory and it makes this kinda cheatfix the whole thing
this.router.navigateByUrl('/');
});
});
}
通过这种方式,您可以将参数保存在SampleService的数据行为主题中。如果您想在某个地方使用它,您要做的就是注入服务,并订阅data$
。
请注意,此解决方案包含一些应谨慎处理的订阅,但不是此问题的主题。
可以找到小型的简短演示here。当您打开带有queryParams作为/?username = foo的stackblitz应用程序时,请检查演示控制台。