angular数据传递练习
父级像下级传送数据
$scope.$broadcast必须在一个函数中才有效果。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>AngularJS broadcast译为广播，即上级传递下级。</title>
<script src="https://cdn.bootcss.com/angular.js/1.7.0/angular.min.js"></script>
</head>
<body ng-app='app'>
<div ng-controller="parent">
Parent: {{mydata}}
<input type="text" ng-model="mydata">
<button ng-click="sendData()">点击数据</button>
<div ng-controller="child">
{{change}} Child: {{child}}
</div>
</div>
<script>
angular.module("app", [])
.controller("child", function($scope) {
$scope.$on("parentChange", function(e, m) { //获取传过来的值
console.log(e,"元素")
console.log(m,"数据值")
$scope.change = "changed";
$scope.child = m;
})
})
.controller("parent", function($scope) {
// $scope.$watch("mydata", function(n, o) {
// console.log(n,"新值")
// console.log(o,"旧值")
// if (n == o) {
// return;
// }
$scope.mydata="初始化值";
$scope.sendData=function(){ //$scope.$broadcast必须在一个事件中才有效果。
$scope.$broadcast("parentChange", $scope.mydata) //上级向下级传值
}
// })
})
</script>
</body>
</html>
效果图
未点击前
点击后
<!DOCTYPE html> <html ng-app="myApp"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title></title> <meta charset="utf-8" /> <script src="https://cdn.bootcss.com/angular.js/1.7.0/angular.min.js"></script> <script> var myApp = angular.module("myApp", []); //控制器Parent myApp.controller("Parent", function ($scope, $window) { $scope.topData = "我是顶级"; $scope.name = "Parent"; //$on用于事件 $scope.$on("FromSelf", function (event, data) { $scope.topData=data.description+'-----FromSelf'; $window.alert("当前节点" + event.currentScope.name + ",截获到了来自" + data.divName + "的事件：" + event.name + "，它的作用是" + data.description + event.targetScope.name); }); $scope.$on("FromChild", function (event, data) { $scope.topData=data.description+'-----FromChild'; $window.alert("当前节点" + event.currentScope.name + ",截获到了来自" + data.divName + "的事件：" + event.name + "，它的作用是" + data.description); }); }); //控制器Self myApp.controller("Self", function ($scope,$window) { $scope.middleData="我是中间数据"; //button的传播事件 $scope.toParent = function () { //注册一个向上传播的事件，eventName:'FromSelf', data:oneObject $scope.$emit("FromSelf", { divName: "Self", description: "向父传播数据" }); }; $scope.toChild = function () { //注册一个向下传播的事件，eventName:'FromSelf', data:oneObject $scope.$broadcast("FromSelf", { divName: "Self", description: "向子传播数据" }); }; $scope.name = "Self"; $scope.$on("FromChild", function (event, data) { $scope.middleData="我是中间数据："+data.description+'-----FromChild'; $window.alert("当前节点" + event.currentScope.name + "截获到了来自" + data.divName + "的事件：" + event.name + "，它的作用是" + data.description); }); }); //控制器Child myApp.controller("Child", function ($scope, $window) { $scope.name = "Child"; $scope.lastName="我是最里面的"; //$on用于截获来自父级作用域的事件 $scope.$on("FromSelf", function (event, data) { $scope.lastName = "我是最里面的:"+data.description+'-----FromSelf'; $window.alert("当前节点" + event.currentScope.name +"截获到了来自" + data.divName + "的事件：" + event.name + "，它的作用是" + data.description); }); //button的传播事件 $scope.toTop = function () { //注册一个向上传播的事件，eventName:'FromChild', data:oneObject $scope.$emit("FromChild", { divName: "Child", description: "向上播数据" }); }; }); </script> </head> <body> <form name="test"> <div ng-controller="Parent"> 这里是父级Div <br> {{topData}} <hr> <div ng-controller="Self"> 这里是子级SelfDiv <hr> {{middleData}} <input type="button" ng-click="toParent()" value="向ParentDiv传播事件" /> <input type="button" ng-click="toChild()" value="向ChildDiv传播事件" /> <hr> <div ng-controller="Child"> 这里是子级ChildDiv <br> {{lastName}} <input type="button" ng-click="toTop()" value="向上传播事件" /> </div> </div> <hr> <div ng-controller="Brother"> 这里是Self的兄弟BrotherDiv </div> </div> </form> </body> </html>
效果图
参考：https://blog.csdn.net/chpllp/article/details/91969194
