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javascript - AngularJs如何将数据从父组件发送到子组件

转载 作者:塔克拉玛干 更新时间:2023-11-02 21:12:35 24 4
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这似乎是一个非常简单的问题,但我已经有一段时间没有得到它的答案了。问题是,当你有一个组件层次结构时,你如何将数据从父组件传递到子组件,以便子组件能够在它们的范围内(或在其他变量中?)访问该数据。

我正在使用 AngularJs 1.5.5

这是我现在拥有的东西,我在 JavaScript 代码中添加了关于我实际想要实现的注释。 - https://plnkr.co/edit/blY85rvARIqkmfCnRBOV?p=preview

index.html

<!DOCTYPE html>
<html>

<head>
<link rel="stylesheet" href="style.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.5/angular.min.js"></script>
<script src="script.js"></script>
</head>

<body>
<div ng-app="myApp">
<dependency></dependency>
</div>
</body>

</html>

脚本.js

// Code goes here
angular.module('myApp', ['dependency']);

// this is parent component
angular.
module('dependency', ['dependency2']).
component('dependency', {
templateUrl: 'dependency.html',
controller: ['$scope', function dependencyController($scope) {
$scope.dependencyScopedVariable = "Some local variables of dependency";
$scope.childComponentParams = [{ name: "child1"}, { name: "child2"}];
}]
});

// this is child component
angular.
module('dependency2', []).
component('dependency2', {
templateUrl: 'dependency2.html',
controller: ['$scope', function dependency2Controller($scope) {
// How to access childParam from parent here?
$scope.itemGotFromParent = "this should be from parent";
}]
});

依赖.html

<div>{{dependencyScopedVariable}}</div>
<dependency2 ng-repeat="childParam in childComponentParams"></dependency2>

依赖2.html

<!-- How to get the childParam repeated in ng-repeat here? -->
<div>{{itemGotFromParent}}</div>

最佳答案

当您使用组件时,它本身就是指令的糖语法。
你可以
1) require 父组件的 Controller 。有关更多信息,请阅读 intercomponent communication2) 将数据作为 bindings 传递。

看下面的例子:

示例#1:

// Code goes here
angular.module('myApp', ['dependency']);

// this is parent component
angular
.module('dependency', ['dependency2'])
.component('dependency', {
template: '<div>{{$ctrl.dependencyScopedVariable}}</div>' +
'<dependency2 ng-repeat="childParam in ' + '$ctrl.childComponentParams"></dependency2>',
controller: function dependencyController() {
this.dependencyScopedVariable = "Some local variables of dependency";
this.childComponentParams = [{
name: "child1"
}, {
name: "child2"
}];
}
});

// this is child component
angular.
module('dependency2', [])
.component('dependency2', {
require: {
dependencyCtrl: '^dependency'
},
template: '<div>{{$ctrl.itemGotFromParent}}</div>',
controller: function dependency2Controller() {

this.$onInit = function() {
this.itemGotFromParent = this.dependencyCtrl.childComponentParams;
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.5/angular.min.js"></script>
<script src="script.js"></script>

<div ng-app="myApp">
<dependency></dependency>
</div>

示例#2:使用组件的绑定(bind)(指令范围)

// Code goes here
angular.module('myApp', ['dependency']);

// this is parent component
angular
.module('dependency', ['dependency2'])
.component('dependency', {
template: '<div>{{$ctrl.dependencyScopedVariable}}</div>' +
'<dependency2 data="childParam" ng-repeat="childParam in ' + '$ctrl.childComponentParams"></dependency2>',
controller: function dependencyController() {
this.dependencyScopedVariable = "Some local variables of dependency";
this.childComponentParams = [{
name: "child1"
}, {
name: "child2"
}];
}
});

// this is child component
angular.
module('dependency2', [])
.component('dependency2', {
bindings: {
data: '<'
},
template: '<div>{{$ctrl.itemGotFromParent}}</div>',
controller: function dependency2Controller() {

this.$onInit = function() {
this.itemGotFromParent = this.data;
}
}
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.5/angular.min.js"></script>
<script src="script.js"></script>

<div ng-app="myApp">
<dependency></dependency>
</div>

关于javascript - AngularJs如何将数据从父组件发送到子组件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42608083/

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