Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
529 views
in Technique[技术] by (71.8m points)

javascript - Angular 2.x bind class on body tag

Since Angular 2.x is bootstrapped inside a body how do I add [class.fixed]="isFixed" on body tag (outside my-app)?

<html>
<head>
</head>
<body [class.fixed]="isFixed">
  <my-app>Loading...</my-app>
</body>
</html>

My app component looks like

import {Component} from 'angular2/core';
import {CORE_DIRECTIVES} from 'angular2/common';
import {RouteConfig, ROUTER_DIRECTIVES, Router, Location} from 'angular2/router';
import {About} from './components/about/about';
import {Test} from './components/test/test';

@Component({
    selector: 'my-app',
    providers: [],
    templateUrl: '/views/my-app.html',
    directives: [ROUTER_DIRECTIVES, CORE_DIRECTIVES],
    pipes: []
})

@RouteConfig([
    {path: '/about', name: 'About', component: About, useAsDefault: true},
    {path: '/test', name: 'Test', component: Test}
])

export class MyApp {
    router: Router;
    location: Location;

    constructor(router: Router, location: Location) {
        this.router = router;
        this.location = location;
    }
}
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

Using <body> as app component works fine but you can't use binding on the <body> tag because it attempts to bind `"isFixed" to the parent and there is no parent.

Use @HostBinding instead

@Component(
  selector: 'body',
  templateUrl: 'app_element.html'
)
class AppElement {
  @HostBinding('class.fixed') 
  bool isFixed = true;
}

This is Dart code but it shouldn't be hard to translate it to TS.

See also @HostBinding and @HostListener: what do they do and what are they for?

You can always use plain JS to update the DOM if you don't depend on server side rendering or web workers.

Alternatively you can just use

document.body.classList.add('foo');

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...