AngularJS组件：在控制器中使用绑定对象 [英] AngularJS component: using binding object in controller

问题描述

我使用Angular组件（来自此的第一个示例）。当我在组件中绑定对象时，它可以在模板中访问，但不在控制器中。

I use Angular component (first example from this). When I binding object in component, it is accessible in template, but isn't in controller.

js：

function HeroDetailController() {
  console.log("Here I want to use hero.name: ");
  console.log(hero.name); // I want to use binding object in controller, but doesn't work
}

angular.module('heroApp').component('heroDetail', {
  templateUrl: 'heroDetail.html',
  controller: HeroDetailController,
  controllerAs: 'ctrl',
  bindings: {
    hero: '='
  }
});

html：

<hero-detail hero="ctrl.hero"></hero-detail>

模板html（这里有效）：

template html (here it works):

<span>Name: {{ctrl.hero.name}}</span>

错误：

ReferenceError：未定义英雄

ReferenceError: hero is not defined

Plunker： https://plnkr.co/edit/U9CJLs6jgrlsZH6tUdr0

推荐答案

你将获取绑定 HeroDetailController 上下文的值此

You will get bindings value inside HeroDetailController context which is this

function HeroDetailController() {
  var ctrl = this;
  console.log("Here I want to use hero.name: ");
  console.log(ctrl.hero);
}

虽然上面不起作用。因为它不会在第一个摘要周期中将初始绑定传递给组件。

Though above would not work. Because it would not pass initial binding to component on 1st digest cycle.

获取值可以使用 $ onInit 组件上的生命周期值。

For getting the value you could use $onInit lifecycle value on component.

function HeroDetailController() {
  var ctrl = this;
  console.log("Here I want to use hero.name: ");
  ctrl.$onInit = function(){
    console.log(ctrl.hero);
  }
}

---

即使你没有 $ onInit 也可以直接得到一个值。同样你需要更改 $ compileProvider config，如下所示。（它已经在1.6 +中引入）

---

Even you could get a value directly without $onInit. For the same you have to change $compileProvider config like below.(it has been introduced in 1.6+)

.config(function($compileProvider){
  $compileProvider.preAssignBindingsEnabled(true)
});

注意：理想情况下，您不应在申请中强制执行上述设置，我刚才给出了演示。

Note: Ideally you shouldn't enforce above setting in your application, I just gave it fore demonstration.

Demo Plunkr

这篇关于AngularJS组件：在控制器中使用绑定对象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！