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?
$scope.itemGotFromParent = "this should be from parent";
}]
});
依赖.html
<div>{{dependencyScopedVariable}}</div>
<dependency2 ng-repeat="childParam in childComponentParams"></dependency2>
依赖2.html
<!-- How to get the childParam repeated in ng-repeat here? -->
<div>{{itemGotFromParent}}</div>
最佳答案
当您使用组件时，它本身就是指令的糖语法。
你可以
1) require 父组件的 Controller 。有关更多信息，请阅读 intercomponent communication
2) 将数据作为 bindings 传递。
看下面的例子:
示例#1:
// Code goes here
angular.module('myApp', ['dependency']);
// this is parent component
angular
.module('dependency', ['dependency2'])
.component('dependency', {
template: '<div>{{$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/