Angular 2上的Twitter小部件 [英] Twitter widget on Angular 2
问题描述
我创建了一个Twitter小部件,并试图将其放入Angular 2项目中,但JS文件不起作用.
I created a Twitter widget and I'm trying to put it in my Angular 2 project, but the JS file does not work.
如果我使用JS(这里)可以正常工作,但是当我切换到另一个选项卡并返回(我安装了Angular Routing)时,它消失了,并显示了A标记中的内容(因此,"Tweets by ..." ).
If I insert it with JS (Here) it works, but when I switch to another tab and back (I have Angular Routing installed) it disappears and shows whatever is in A tag (so, "Tweets by ...").
HTML代码(在家庭组件中):
HTML code (it's in home component):
<md-card-content>
<a class="twitter-timeline" data-lang="en" data-height="350" data-theme="light" data-chrome="noborders nofooter noheader noscrollbar transparent" href="https://twitter.com/profile">Tweets by profile</a>
</md-card-content>
home.component.ts中的脚本,该代码由@ Arg0n提供(请看答案部分):
Script in home.component.ts, the code was provided by @Arg0n (look in answers section):
import { Component, OnInit } from '@angular/core';
import { Router, NavigationEnd } from '@angular/router';
@Component({
selector: 'app-home',
templateUrl: './home.component.html',
styleUrls: ['./home.component.css']
})
export class HomeComponent implements OnInit {
constructor(private _router : Router) { }
public ngOnInit() {
this._router.events.subscribe(val => {
if (val instanceof NavigationEnd) {
(<any>window).twttr = (function (d, s, id) {
let js: any, fjs = d.getElementsByTagName(s)[0],
t = (<any>window).twttr || {};
if (d.getElementById(id)) return t;
js = d.createElement(s);
js.id = id;
js.src = "https://platform.twitter.com/widgets.js";
fjs.parentNode.insertBefore(js, fjs);
t._e = [];
t.ready = function (f: any) {
t._e.push(f);
};
return t;
}(document, "script", "twitter-wjs"));
twttr.widgets.load();
}
})
}
}
好吧,我进行了一些研究,发现我必须再次使用twttr.widgets.load();
加载小部件,但是这样做会引发错误.
Alright, I did some research and found out that I have to load the widget again with twttr.widgets.load();
but doing that, it throws me an error.
我已经编辑了上面的代码,因此您可以看到我尝试过的内容.上面的代码返回错误:
I edited the code above, so you can see what I've tried. The code above returns an error:
[ts] Cannot find name 'twttr'
如果我追加(窗口).对此,它引发了我这个问题:
if I append (window). to it, it throws me this:
EXCEPTION: Uncaught (in promise): TypeError: Cannot read property 'load' of undefined
有关负载属性的文档位于此处: https://dev.twitter.com/web/javascript/initialization
The documentation on load property is here: https://dev.twitter.com/web/javascript/initialization
推荐答案
好的,我找到了解决方案.当我们在Angular路由器之间切换时,小部件将卸载.这就是我们放置订户的原因,因此,每次在选项卡之间切换时,我们都会加载小部件.我们可以在此处> 如何加载用于延迟加载内容的小部件.页面准备好后,我们可以使用该功能加载小部件.视图毁坏后,别忘了退订!
Alright, I found a solution to this. When we switch between Angular routers, the widget unloads. That's why we put a subscriber, so we load the widget every time we switch between tabs. We can see here how to load the widget for lazy-loading content. When the page is ready, we can use that function to load the widget. Don't forget to unsubscribe after the view is destroyed!
代码:
import { Component, OnDestroy } from '@angular/core';
import { Router, NavigationEnd } from '@angular/router';
@Component({ ... })
export class HomeComponent implements OnDestroy {
private twitter: any;
constructor(private _router: Router) {
this.initTwitterWidget();
}
initTwitterWidget() {
this.twitter = this._router.events.subscribe(val => {
if (val instanceof NavigationEnd) {
(<any>window).twttr = (function (d, s, id) {
let js: any, fjs = d.getElementsByTagName(s)[0],
t = (<any>window).twttr || {};
if (d.getElementById(id)) return t;
js = d.createElement(s);
js.id = id;
js.src = "https://platform.twitter.com/widgets.js";
fjs.parentNode.insertBefore(js, fjs);
t._e = [];
t.ready = function (f: any) {
t._e.push(f);
};
return t;
}(document, "script", "twitter-wjs"));
if ((<any>window).twttr.ready())
(<any>window).twttr.widgets.load();
}
});
}
ngOnDestroy() {
this.twitter.unsubscribe();
}
}
这篇关于Angular 2上的Twitter小部件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!