$scope 未在脚本 2 中定义

Question

无法从下拉列表中获取 ng-change 所选值。

我正在尝试将下拉列表中的选定值传递给脚本 2 中的 API 调用，如下所示，但无法这样做。

在 chrome 开发人员工具中，它在脚本 2( $scope.changedValue = function ()).

中显示错误消息为“$scope is not defined”

  <!DOCTYPE html>
    <html>
    <head>
        <script src="Scripts/angular.js"></script>
        <script src="Scripts/angular-resource.js"></script>
        <script>

            var IM_Mod_app = angular.module('IM_ng_app', []);
    
            // script 1: To fetch all flrs from API call. - working as expected. IM_Mod_app.controller("IM_Ctrl", function ($scope, $http) {
            $http({
                method: 'GET',
                url: 'http://localhost:55762/api/ItemMaintenance/GetAllFlavors',
                params: { Id: 'US06' }
            }).then(function successCallback(response) {
               // alert(response.data);         
                $scope.flavours = response.data;
            }, function errorCallback(response) {
                     // alert(response);
                });           
        });

// 脚本：2 - 获取所选值并将其传递给 API 以获取数据。

               // IM_Mod_app.controller("IM_Ctrl", function ($scope) {
        $scope.changedValue = function () {
            alert("h1111i");
                $scope.selectedvalues = $scope.flv.FLAVOR_ID;
            }.then(function successCallback(response) {
                // success on on change event - call api to get data
                alert("hi");
                $http({
                    method: 'GET',
                    url: 'http://localhost:55762/api/ItemMaintenance/GetAllFlavors',
                    params: { Id: 'US15' }
                }).then(function successCallback(response) {
                    // scuucess on fetching data from api call
                    // alert(response.data);

                    $scope.flavours = response.data;
                }, function errorCallback(response) {
                    // error on fetching data from api call
                    // alert(response);
                });
                $scope.flavours = response.data;
            }, function errorCallback(response) {
                //  error on onchange event
            });
       // });

    </script>

</head>
    
    <body ng-app="IM_ng_app">
        <div ng-controller="IM_Ctrl">
            <select ng-model="flv"
                    ng-options="flv.FLAVOR_ID for flv in flavours"
                    ng-change="changedValue(flv)">
                <option value="">Select Flavor</option>
            </select>
           <h1>{{flv.FLAVOR_ID}}</h1>
           
        </div>  
    </body>
    </html>

看起来它没有进入脚本 2 本身（没有在脚本 2 中触发警报消息）。

任何人都可以帮助我解决上述问题。

Answer 1

这里的问题是你在两个地方有 flv 值，这两个地方似乎是冲突的，即 ng-options 和 flv 在 ng-options.

<select ng-model="flv" ng-options="flv.FLAVOR_ID for flv in flavours" ng-change="changedValue(flv)">
    <option value="">Select Flavor</option>
</select>

将 flv 的值更改为 ng-options 中的 flavor 应该可以解决问题

ng-options="flavor.FLAVOR_ID for flavor in flavours"

Answer 2

IM_Mod_app.controller("IM_Ctrl", function ($scope) { $scope.changedValue = function () { alert("h1111i"); $scope.selectedvalues = $scope.flv.FLAVOR_ID; }.then(function successCallback(response) { // success on on change event - call api to get data alert("hi"); $http({ method: 'GET', url: 'http://localhost:55762/api/ItemMaintenance/GetAllFlavors', params: { Id: 'US15' } }).then(function successCallback(response) { // scuucess on fetching data from api call // alert(response.data); $scope.flavours = response.data; }, function errorCallback(response) { // error on fetching data from api call // alert(response); }); $scope.flavours = response.data; }, function errorCallback(response) { // error on onchange event }); 
});

Answer 3

使用下面的代码。

  IM_Mod_app.controller("IM_Ctrl", function ($scope, $http) {
                $http({
                    method: 'GET',
                    url: 'http://localhost:55762/api/ItemMaintenance/GetAllFlavors',
                    params: { Id: 'US06' }
                }).then(function successCallback(response) {
                   // alert(response.data);         
                    $scope.flavours = response.data;
                }, function errorCallback(response) {
                         // alert(response);
                    });  
     $scope.changedValue = function () {
                   // alert("hgjhhg");
                    alert($scope.flv.FLAVOR_ID);
                    // success on on change event - call api to get data
                    $http({
                        method: 'GET',
                        url: 'http://localhost:55762/api/ItemMaintenance/GetAllFlavors',
                        params: { Id: 'US15' }
                    }).then(function successCallback(response) {
                        alert(response.data);
                        $scope.flavours = response.data;
                    }, function errorCallback(response) {
                        // alert(response);
                    });
                }
            });

右括号是问题所在。希望有用。

$scope 未在脚本 2 中定义

$scope is not defined in script 2

angularjs

angularjs-directive

angularjs-scope

angularjs-controller

angularjs-ng-change

无法从下拉列表中获取 ng-change 所选值。