Angular-routerLink和状态问题 [英] Angular - Issue with routerLink and state

问题描述

我想从HTML页面使用routerLink和state路由到另一页面.使用标签没有问题，在登录页面的ngOnInit期间，我可以按预期检索状态.使用标签主页也可以导航，但是状态结果未定义.

From an html page I want to route to another page using routerLink and state. With tag there's no issues, during ngOnInit in landing page, I can retrieve state as expected. Using tag home page is navigate as well but state results undefined.

我怎么了?

登录页面的HTML

<button routerLink="/home" [state]="navExtra.state">
    Go Home Page via button
</button>
<a routerLink="/home" [state]="navExtra.state">Go Home Page via a</a>

登录页面的数量

import { Component, OnInit } from '@angular/core';
import { NavigationExtras } from '@angular/router';

@Component({
  selector: 'app-login',
  templateUrl: './login.page.html',
  styleUrls: ['./login.page.scss']
})
export class LoginPage implements OnInit {
  navExtra: NavigationExtras = {
    state: { data: { a: 'a', b: 'b' } }
  };
  constructor() {}

  ngOnInit() {}
}

首页

import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';

@Component({
  selector: 'app-home',
  templateUrl: './home.page.html',
  styleUrls: ['./home.page.scss']
})
export class HomePage implements OnInit {
  constructor(
    private router: Router
  ) {}

  ngOnInit() {
    console.log(this.router.getCurrentNavigation().extras.state);
  }
}

推荐答案

我认为无法通过按钮传递 state .如果我们检查 routerLink 的源代码，我们可以看到...

I don't think it is possible to pass state through a button. If we inspect the source code of routerLink, we can see...

不是一个 a 标记时:

@Directive({selector: ':not(a):not(area)[routerLink]'})

状态不包含在 extras 中:

@HostListener('click')
onClick(): boolean {
  const extras = {
    skipLocationChange: attrBoolValue(this.skipLocationChange),
    replaceUrl: attrBoolValue(this.replaceUrl),
  };
  this.router.navigateByUrl(this.urlTree, extras);
  return true;
}

源

而当我们有一个 a 标记时:

whereas when we have an a tag:

@Directive({selector: 'a[routerLink],area[routerLink]'})

其中包括:

@HostListener('click', [/** .... **/])
onClick(/** .... **/): boolean {
  // .....
  const extras = {
    skipLocationChange: attrBoolValue(this.skipLocationChange),
    replaceUrl: attrBoolValue(this.replaceUrl),
    state: this.state // <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< here!
  };
  this.router.navigateByUrl(this.urlTree, extras);
  return false;
}

源

因此，您的选择是将链接的样式设置为看起来像按钮，或者在按钮单击时调用一个函数来执行导航，如其他答案所示，在这里，我指的是 AbolfazlR :

So your option is to style that link to look like a button, or then call a function on button click which performs the navigation, like presented in other answer, here I kindly refer to that code posted by AbolfazlR:

this.router.navigate(['home'], this.navExtra);

这篇关于Angular-routerLink和状态问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！