http调用后如何更新视图中的范围变量值? [英] How to update scope variable value in view after http call?

问题描述

我正在使用 Angularjs 1.4.3 制作我的第一个项目.

在我的控制器中，我正在发出一个 http 请求，在此 http 请求的 success 方法中，我正在更新范围变量.在 http 调用中，我获得了最新值，但在视图端它没有更新值.

Plunker 链接(感谢@rupesh_padhye).(因为它调用的是servlet action，所以Plunker中不会显示任何数据)

app.controller('measuresCtrl', ['$scope', '$modal', '$http', function($scope, $modal, $http) {$scope.groups = []$scope.loadAllMeasure = function() {$http.get("fetchAllMeasure").成功(功能(数据){console.log("插入前");控制台日志($scope.groups)；$scope.groups = data.measures;console.log("插入后");控制台日志($scope.groups)；}).错误(功能(){});};$scope.loadAllMeasure();$scope.submit = 函数(表单){$http({方法:'POST'，网址:'saveMeasure'，数据: {id:form.id，名称:form.name，描述:form.description},标头:{'Content-Type':'application/x-www-form-urlencoded'}}). 成功(功能(数据，状态，标题，配置){$scope.loadAllMeasure();}).错误(功能(数据，状态，标题，配置){});}

})

每当我对度量执行任何 CRUD 操作时，我都会调用一个方法 $scope.loadAllMeasure();.但它没有更新视图(jsp)页面中的值.

我尝试了 $scope.$apply 方法，但我收到 Error: $digest already in progress.

当我在 success 方法中使用 console.log 打印 $scope.groups 的值时，它会显示最新的值.

在我的视图 (jsp) 页面中，我只是使用 ng-repeat 函数以表格格式显示所有记录.

我的视图页面的代码(最少代码)-

<div><input type="checkbox" id="checkbox-{{group.id}}" class="ui-checkbox"/><label for="checkbox-{{group.id}}">{{group.name}}</label>
<div>{{group.description}}</div><div><div class="fa fa-pencil button" data="{{group.id}}" id="{{::elementId}}" ng-click="showEditForm(group.id, $event)"></div><div class="fa fa-trash button" data="{{group.id}}" ng-click="deleteGroup(group.id)"></div><div class="fa fa-clone button" data="{{group.id}}" id="{{::elementId}}" ng-click="showCloneForm(group.id, $event)"></div>

console.log 中的值是

插入前Object { id=1, description="Measure Description1", name="Demo"}]

和

插入后[对象{ id=1，描述=度量描述1"，名称=演示"}，对象{ id=2，描述=描述2"，名称=演示2"}]

如何在http调用后更新view中的scope变量值?

解决方案

我看不出你的示例代码有什么问题.

我创建了一个 JSFiddle 来尝试帮助您.

服务器调用已被一个返回承诺的 setTimeout 函数取代.

请参阅 JSFiddle https://jsfiddle.net/sjwkbzxa/

请看下面的例子:

<button data-ng-click="loadAllMeasure()">从服务器加载列表</button><ul><li data-ng-repeat="分组 | orderBy:'name'"><span>{{group.description}}</span>

JavaScript:

angular.module('application',[]).controller("TestController", ['$scope', '$q', function($scope, $q){$scope.groups = [{ id:1, description:"Initial List", name:"Demo"}];$scope.loadAllMeasure = function(){加载数据().然后(功能(数据){$scope.groups = 数据；});};函数加载数据(){var deferred = $q.defer();设置超时(功能(){var data = [{ id:1, description:"Measure Description1", name:"Demo"}, { id:2, description:"Description2", name:"Demo2"}];deferred.resolve(data);}, 3000);返回 deferred.promise;}}]);

也许您遗漏了一些我们看不到的东西?

I am making my first project using Angularjs 1.4.3.

In my controller I am making a http request, in the success method of this http request I am updating a scope variable. In http call I am getting the latest values but in the view side its not updating the values.

Plunker Link (@rupesh_padhye thanks). (Since it is calling the servlet action, so no data will be shown in Plunker)

app.controller('measuresCtrl', ['$scope', '$modal', '$http', function($scope, $modal, $http) {



    $scope.groups = []
        $scope.loadAllMeasure = function() {
            $http.get("fetchAllMeasure")
            .success(function(data) {
                console.log("Before insert");
                console.log($scope.groups);

                $scope.groups = data.measures;

                console.log("After insert");
                console.log($scope.groups);
            })
            .error(function() {
            });
        };

        $scope.loadAllMeasure();

$scope.submit = function (form) {
$http({
        method: 'POST',
        url: 'saveMeasure',
        data: {
               id: form.id,
               name: form.name,
               description: form.description
              },
        headers: {'Content-Type': 'application/x-www-form-urlencoded'}
        }).success(function(data, status, headers, config) {
           $scope.loadAllMeasure();
        }).error(function(data, status, headers, config) {
   });
 }

})

And whenever I am performing any CRUD operation on measures I am calling a method $scope.loadAllMeasure();. But its not updating the values in the view (jsp) page.

I have tried $scope.$apply method but I am getting Error: $digest already in progress.

When I printed the value for $scope.groups using console.log inside success method, then its showing the latest values.

In my view (jsp) page I am just using ng-repeat function to show all the records in table format.

Code for my view page (minimal code) -

<div ng-repeat="group in groups | orderBy:'name'">
    <div>
        <input type="checkbox" id="checkbox-{{group.id}}" class="ui-checkbox" /><label for="checkbox-{{group.id}}">{{group.name}}</label>
    </div>
    <div>{{ group.description}}</div>
    <div>   
            <div class="fa fa-pencil button" data="{{group.id}}" id="{{::elementId}}" ng-click="showEditForm(group.id, $event)"></div>
            <div class="fa fa-trash button" data="{{group.id}}" ng-click="deleteGroup(group.id)"></div>
            <div class="fa fa-clone button" data="{{group.id}}" id="{{::elementId}}" ng-click="showCloneForm(group.id, $event)"></div>
    </div>
</div>

Values in console.log are

Before insert
Object { id=1,  description="Measure Description1",  name="Demo"}]

And

After Insert
 [Object { id=1,  description="Measure Description1",  name="Demo"}, Object { id=2,  description="Description2",  name="Demo2"}]

How to update scope variable value in view after http call?

解决方案

I cant see anything wrong with your example code.

I have created a JSFiddle to try and help you.

The server call has been replaced by a setTimeout function that returns a promise.

Please see JSFiddle https://jsfiddle.net/sjwkbzxa/

Please see example below:

<div data-ng-controller="TestController as vm">
    <button data-ng-click="loadAllMeasure()">Load List from Server</button>
    <ul>
        <li data-ng-repeat="group in groups | orderBy:'name'">
            <span>{{group.description}}</span>
        </li>
    </ul>
</div>

The javascript:

angular.module('application',[]).controller("TestController", ['$scope', '$q', function($scope, $q){    
    $scope.groups = [{ id:1,  description:"Initial List",  name:"Demo"}];

    $scope.loadAllMeasure = function(){
       loadData().then(function(data){
         $scope.groups = data;
       });
     };

    function loadData(){
        var deferred = $q.defer();
        setTimeout(function(){
            var data = [{ id:1,  description:"Measure Description1",  name:"Demo"}, { id:2,  description:"Description2",  name:"Demo2"}];
            deferred.resolve(data);
        }, 3000);
       return deferred.promise;
    }
}]);

Maybe you are missing something on your side that we cant see?

这篇关于http调用后如何更新视图中的范围变量值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！