在Angular 2中有没有聪明的方法返回到最后一页?
类似的
this._router.navigate(LASTPAGE);
例如,C页有一个“返回”按钮,
A页-> C页,点击返回A页。 B页-> C页,点击它,回到B页。
路由器有这个历史信息吗?
在Angular 2中有没有聪明的方法返回到最后一页?
类似的
this._router.navigate(LASTPAGE);
例如,C页有一个“返回”按钮,
A页-> C页,点击返回A页。 B页-> C页,点击它,回到B页。
路由器有这个历史信息吗?
当前回答
也为我工作时,我需要移动回文件系统。 P.S. @angular: "^5.0.0"
<button type="button" class="btn btn-primary" routerLink="../">Back</button>
其他回答
在angular 4中使用preserveQueryParams,例如:
url: /list?page=1
<a [routerLink]="['edit',id]" [preserveQueryParams]="true"></a>
当点击链接时,您将被重定向编辑/10?Page =1,保留参数
裁判:https://angular.io/docs/ts/latest/guide/router.html # !# link-parameters-array
在Angular 2的最终版本中。X / 4。x -这里是文档https://angular.io/api/common/Location
/* typescript */
import { Location } from '@angular/common';
// import stuff here
@Component({
// declare component here
})
export class MyComponent {
// inject location into component constructor
constructor(private location: Location) { }
cancel() {
this.location.back(); // <-- go back to previous location on cancel
}
}
是的,你能做到。在你的typescript组件上编写这段代码,然后享受吧!
import { Location } from '@angular/common'
import { Component, Input } from '@angular/core'
@Component({
selector: 'return_page',
template: `<button mat-button (click)="onReturn()">Back</button>`,
})
export class ReturnPageComponent {
constructor(private location: Location) { }
onReturn() {
this.location.back();
}
}
此外,您还可以在历史记录为空的情况下使用此服务与回退功能
url-back.service.ts
import { Injectable } from '@angular/core';
import { Location } from '@angular/common';
import { Router } from '@angular/router';
const EMPTY_HISTORY_LENGTH = 2;
/**
* This service helps to Navigate back to the prev page, and if no prev page,
* will redirect to the fallback url.
*/
@Injectable()
export class UrlBackService {
constructor(private router: Router, private location: Location) {}
/**
* This method will back you to the previous page,
* if no previous page exists, will redirect you to the fallback url.
* @param href - url, if tryNativeFirst is provided, this is fallback url
* @param tryNativeFirst - try to go back natively using browser history state.
*/
back(href: string, tryNativeFirst: boolean = false) {
if (tryNativeFirst) {
if (history.length === EMPTY_HISTORY_LENGTH) {
this.router.navigate(UrlBackService.urlToArray(href));
} else {
this.location.back();
}
} else {
this.router.navigate(UrlBackService.urlToArray(href));
}
}
/**
* In case that router.navigate method tries to escape all '/' in the string,
* was decided to split string to array, and if URL starts or ends with slash - remove them, eg:
* /my/url will be split to ['', 'my', 'url'], so we need to remove empty spaces use filter function.
* @param href
* @private
*/
private static urlToArray(href: string) {
return href.split('/').filter((notEmpty) => notEmpty);
}
}
url-back.service.spec.ts
import { TestBed } from '@angular/core/testing';
import { UrlBackService } from './url-back.service';
import { Router } from '@angular/router';
import { Location } from '@angular/common';
import { RouterTestingModule } from '@angular/router/testing';
describe('UrlBackService', () => {
let service: UrlBackService;
let router: Router;
let location: Location;
beforeEach(() => {
TestBed.configureTestingModule({
imports: [RouterTestingModule],
providers: [UrlBackService],
});
service = TestBed.inject(UrlBackService);
router = TestBed.inject(Router);
location = TestBed.inject(Location);
});
it('should be created', () => {
expect(service).toBeTruthy();
});
it('no meter what history state is, it should be redirected to the /my/url', () => {
spyOn(router, 'navigate');
service.back('/my/url');
expect(router.navigate).toHaveBeenCalledWith(['my', 'url']);
});
it('in case history is empty push to /my/url', () => {
spyOn(router, 'navigate');
service.back('/my/url', true);
expect(router.navigate).toHaveBeenCalledWith(['my', 'url']);
});
it('in case history is NOT empty push to url1', () => {
spyOn(location, 'back');
window.history.pushState(null, '', 'url1');
service.back('/my/url', true);
expect(location.back).toHaveBeenCalled();
});
});
你可以在你的路由类上实现routerOnActivate()方法,它会提供之前路由的信息。
routerOnActivate(nextInstruction: ComponentInstruction, prevInstruction: ComponentInstruction) : any
然后你可以使用router.navigateByUrl()并传递ComponentInstruction生成的数据。例如:
this._router.navigateByUrl(prevInstruction.urlPath);