Angular 1.5 中的组件通信 [英] Component communication in angular 1.5

问题描述

Angular 1.5 组件通信建议通常具有输出绑定以调用根控制器上的方法.

Angular 1.5 component communication suggestions usually have output bindings to invoke methods on root controllers.

假设我有一个根组件和两个子组件.

Let's say I have a root component, and two child components.

<root>
    <child-1></child-1>
    <child-2></child-2>
</root>

它想通过读取组件 2 上的值然后在根中执行某些操作来对组件 1 上的按钮单击做出反应.

It'd like to react to a button click on component one by reading a value on component two and then doing something in the root.

例如，child-1 是一个指令，它包装了一个绘图库，该库将一个绘图附加到其 DOM 节点并具有一个变量来控制该绘图.

For example, child-1 is a directive which wraps a drawing library that attaches a drawing to its DOM node and has a variable to control that drawing.

child-2 有一个按钮.当它被点击时，来自 child-1 变量的数据应该传递给 root，它会用它做一些事情.

child-2 has a button. When it is clicked, data from the child-1 variable should be passed on to root which does something with it.

具体来说，child-1 包装了 var graph2d = new vis.Graph2d(container, dataset, options);.稍后，我想从 graph2d 检索一些信息并将其传递给 root 以对其进行处理.

Specifically, child-1 wraps var graph2d = new vis.Graph2d(container, dataset, options);. Later on, I would like to retrieve some information from graph2d and pass it on to root to do something with it.

这归结为:组件如何对其他组件发出的事件做出反应?输入和输出建议似乎没有涵盖这种情况.

This boils down to: how can components react to events issued by other components? The inputs and outputs suggestions don't seem to cover that scenario.

推荐答案

在 angular 1.5 中，您可以使用 require 和/或 属性绑定(输入/输出)进行通信.

In angular 1.5 you can use require and/or property bindings (input/output) to communicate.

如果您使用 require 属性，那么您的根组件将发布一个 api，您的子组件将获得对控制器的引用:

If you use the require property then your root component would publish an api and your child component would get a reference to the controller:

angular.module('app').component('child1', {
   bindings: {},
   require: {api: '^root'}, //your <root> component
   template: '',
   controller: controller
});

然后您可以在子组件中使用根组件的方法:

You can then use the methods of the root component in your child component:

$ctrl.api.addWatchedBook();

这是根组件控制器功能:

This is the root component controller function:

$ctrl.addWatchedBook = addWatchedBook;

function addWatchedBook(bookName){

  booksWatched.push(bookName);

}

这是一个完整的架构概述:组件通信

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