Angular - 数据在 ng-init 中不可用 [英] Angular - data not available inside ng-init

问题描述

Angular 部分 - HTML.基本控件

 
<input type="text" ng-init="setTags(viewData['users'])" ui-select2="tagAllOptions" ng-model="tagsSelection" name="users"/>{{viewData['users']}} 正确响应.但是在 ng-init 回调中传递时未定义.
<input type="text" class="span12" placeholder="Brief Description" name="description" value="{{viewData['description']}}">正确回声.

Controller.js

function SelectTagCtrl(){$scope.setTags = 函数(数据){//使用 viewData['users'] 时未定义数据.<-- 问题//当我传递一些静态字符串时更正.}}//填充要在视图部分中使用的视图数据.函数 BaseCtrl(){$http.get(url).success(function(data){$scope.viewData = data.data ||[];$scope.view_type = $scope.viewData['view_type'];$scope.fields = data.data.fields;console.log($scope);}).错误();}

解决方案

使用 timeout 将是一种解决方法，相反我会在控制器中使用一个 $scope 变量来知道 ajax 调用是否已完成.

问题是 ng-init 可能在 ajax 完成之前被调用.

我已经在我的 angular 项目中配置了 ui-if 指令，所以我将它与 $scope 变量的组合一起使用以使事情正常工作.

<input type="text" ng-init="setTags(viewData['users'])" ui-select2="tagAllOptions" ng-model="tagsSelection" name="users"/>

在控制器内部，

 $http.get(gurl + '.json').success(function(data,status){//一些东西$scope.ajax_done = true;}).错误();

由于 angular 的神奇双向绑定，元素将得到更新.现在它看到 ajax 请求已完成，ui-if 将获得一个真值，元素的 ng-init 指令将有机会执行其回调.

EDIT:ui-if 已从 Angular 中删除UI 支持 ng-if 现在内置.

Angular partial - HTML. BaseCtrl

 <div ng-controller="SelectTagCtrl">       
     <input type="text" ng-init="setTags(viewData['users'])" ui-select2="tagAllOptions" ng-model="tagsSelection" name="users"  />   
     {{viewData['users']}} ECHOES CORRECTLY. 
     But undefined when passed inside ng-init callback.
 </div>

 <input type="text" class="span12" placeholder="Brief Description" name="description" value="{{viewData['description']}}">
 ECHOES CORRECTLY.     

Controller.js

function SelectTagCtrl(){
 $scope.setTags = function(data){       
    // data is undfined when viewData['users'] is used. <-- PROBLEM
    // correct when I pass some static string. 
 }     
}


//POPULATING viewData to be used inside view partial.  

function BaseCtrl(){
    $http.get(url).success(function(data){   
    $scope.viewData = data.data || [];        
    $scope.view_type = $scope.viewData['view_type'];
    $scope.fields = data.data.fields;                   
    console.log($scope);

  }).error();
}

解决方案

Using timeout would be a workaround, instead I would take a $scope variable inside the controller to know if the ajax call has completed.

The problem is ng-init might get called before ajax completion.

I already had ui-if directive configured in my angular project, so I used it with the combination of $scope variable to get the things working.

<div ng-controller="SelectTagCtrl" ui-if="ajax_done">       
     <input type="text" ng-init="setTags(viewData['users'])" ui-select2="tagAllOptions" ng-model="tagsSelection" name="users"  />  
</div>

And inside controller,

 $http.get(gurl + '.json').success(function(data,status){
      // some stuff
      $scope.ajax_done = true;
 }).error();

Because of angular's magical two-way binding, the element will get updated. Now it sees that ajax request is completed, ui-if will get a truthy value and ng-init directive of the element will get a chance to execute its callback.

EDIT: ui-if was removed from Angular UI in favour of ng-if which is now built in.

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