控制器功能中的角度设置 $scope.value 不起作用 [英] angular set $scope.value in controller function is not working

问题描述

我试图在由指令创建的控制器函数中设置一个角度变量值.不知何故，由于某些未知原因，它无法正常工作.该值在独立设置时显示，但在我尝试在控制器函数中分配值时不起作用.

我的代码如下，

<头><meta charset="UTF-8"/><script src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script><script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.5/angular.min.js"></script><身体><div ng-app="mainApp"><div ng-controller="MyController"><div id="Details" class="Details">{{Details}}</div></br><div id="Test" class="Test"><collection collection='testdata'></collection>

<脚本>var mainApp = angular.module("mainApp", [])mainApp.directive('collection', function () {返回 {限制:E"，替换:真的，范围:{collection: '=', showFn : '&'},模板:<ul><member ng-repeat='member in collection' member='member'></member></ul>"}})mainApp.directive('member', function ($compile) {var NewChild = "<li><span ng-click=ShowDetailsFunc()>{{member.TagName}}</span></li>";返回 {限制:E"，替换:真的，范围:{member: '=', ShowHideCtrlFunc : '&', ShowDetailsCtrlFunc : '&'},模板:NewChild，控制器:'我的控制器'，链接:函数(范围、元素、属性){var collectionSt = '<collection collection="member.children"></collection>';如果(angular.isArray(scope.member.children)){$compile(collectionSt)(范围，功能(克隆，范围){element.attr('xml-path', scope.member.TagPath);element.append(克隆);});scope.ShowDetailsFunc = function() {scope.ShowDetailsCtrlFunc(element,event);}}}}})mainApp.controller('MyController', function ($scope) {$scope.testdata = [{"TagName":"MyRootNode","TagPath":">MyRootNode","children":[{"TagName":"LandXML","TagPath":">MyRootNode>ChildItems>LandXML","children":[{"TagName":"Units","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Units","children":[{"TagName":"Imperial","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[1]>Imperial","children":[]},{"TagName":"Project","TagPath":">;MyRootNode>ChildItems>ChildItems[1]>Project","children":[]},{"TagName":"Application","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Application","children":[{"TagName":"Author","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[2]>Author","children":[]},{"TagName":"Alignments","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Alignments","children":[]},{"TagName":"Roadways","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Roadways","children":[{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[1]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[2]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[3]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[4]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[5]","children":[]}]}]}]}]},{"TagName":"Surfaces","TagPath":">MyRootNode>ChildItems>Surfaces","children":[{"TagName":"Surface1","TagPath":">MyRootNode>ChildItems>ChildItems[2]>Surface1","children":[]},{"TagName":"Surface2","TagPath":">;MyRootNode>ChildItems>ChildItems[2]>Surface2","children":[]}]}]}]$scope.Details = "默认值"$scope.ShowDetailsCtrlFunc = 函数(元素，事件){console.log("在函数 ShowDetailsCtrlFunc");var myxmlpath = $(element).attr("xml-path")$scope.Details = getObjects($scope.testdata, 'TagPath', myxmlpath)[0].TagName;console.log($scope.Details)//event.stopImmediatePropagation();};});函数 getObjects(obj, key, val) {var 对象 = [];for (var i in obj) {if (!obj.hasOwnProperty(i)) 继续；if (typeof obj[i] == 'object') {objects = objects.concat(getObjects(obj[i], key, val));} else if (i == key && obj[key] == val) {对象.推(对象)；}}返回对象；}</html>

请帮助我了解我在哪里犯了错误以及如何纠正.

请帮忙.非常感谢.

解决方案

问题在于，当您以这种循环方式创建指令时，您正在嵌套 MyController-controller.结果是 $scope.Details 被设置在特定的嵌套作用域上，而不是在视图中呈现值的作用域.

您可以通过 $emit 将新值发送到上游并最终达到呈现范围值的更改来解决此问题.

这是一个例子

var mainApp = angular.module("mainApp", [])mainApp.directive('collection', function () {返回 {限制:E"，替换:真的，范围:{collection: '=', showFn : '&'},模板:<ul><member ng-repeat='member in collection' member='member'></member></ul>"}})mainApp.directive('member', function ($compile) {var NewChild = "<li><span ng-click=ShowDetailsFunc()>{{member.TagName}}</span></li>";返回 {限制:E"，替换:真的，范围:{member: '=', ShowHideCtrlFunc : '&', ShowDetailsCtrlFunc : '&'},模板:NewChild，控制器:'我的控制器'，链接:函数(范围、元素、属性){var collectionSt = '<collection collection="member.children"></collection>';如果(angular.isArray(scope.member.children)){$compile(collectionSt)(范围，功能(克隆，范围){element.attr('xml-path', scope.member.TagPath);element.append(克隆);});scope.ShowDetailsFunc = function() {scope.ShowDetailsCtrlFunc(element);}}}}})mainApp.controller('MyController', function ($scope) {$scope.testdata = [{"TagName":"MyRootNode","TagPath":">MyRootNode","children":[{"TagName":"LandXML","TagPath":">MyRootNode>ChildItems>LandXML","children":[{"TagName":"Units","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Units","children":[{"TagName":"Imperial","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[1]>Imperial","children":[]},{"TagName":"Project","TagPath":">;MyRootNode>ChildItems>ChildItems[1]>Project","children":[]},{"TagName":"Application","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Application","children":[{"TagName":"Author","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[2]>Author","children":[]},{"TagName":"Alignments","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Alignments","children":[]},{"TagName":"Roadways","TagPath":">MyRootNode>ChildItems>ChildItems[1]>Roadways","children":[{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[1]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[2]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[3]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[4]","children":[]},{"TagName":"Roadway","TagPath":">MyRootNode>ChildItems>ChildItems[1]>ChildItems[3]>Roadway[5]","children":[]}]}]}]}]},{"TagName":"Surfaces","TagPath":">MyRootNode>ChildItems>Surfaces","children":[{"TagName":"Surface1","TagPath":">MyRootNode>ChildItems>ChildItems[2]>Surface1","children":[]},{"TagName":"Surface2","TagPath":">;MyRootNode>ChildItems>ChildItems[2]>Surface2","children":[]}]}]}]$scope.Details = "默认值";$scope.ShowDetailsCtrlFunc = 函数(元素){console.log("在函数 ShowDetailsCtrlFunc");var myxmlpath = angular.element(element).attr("xml-path")var detail = getObjects($scope.testdata, 'TagPath', myxmlpath)[0].TagName;控制台日志(详细信息)；$scope.$emit('detailSelected',detail);//event.stopImmediatePropagation();};$scope.$on('detailSelected',function($event, message){$scope.Details = 消息；});});函数 getObjects(obj, key, val) {var 对象 = [];for (var i in obj) {if (!obj.hasOwnProperty(i)) 继续；if (typeof obj[i] == 'object') {objects = objects.concat(getObjects(obj[i], key, val));} else if (i == key && obj[key] == val) {对象.推(对象)；}}返回对象；}

<头><meta charset="UTF-8"/><script data-require="angularjs@1.6.4" data-semver="1.6.4" src="https://code.angularjs.org/1.6.4/angular.min.js"></脚本><身体><div ng-app="mainApp"><div ng-controller="MyController"><div id="Details" class="Details">{{Details}}</div></br><div id="Test" class="Test"><collection collection='testdata'></collection>

</html>