AngularJS错误:$apply已经在进行中

Question

我有这个AngularJS 1.0.7代码，它使用角度文件上传插件上传照片：

.HTML：

<div ng-hide="user.mainPhoto" style="margin-top: 20px">
    <center>
        <div ng-controller="FileUploadCtrl">
             <button class="btn btn-success btn-primary" ng-click="clickFileInput('addMainPhoto')"><i class="fa-icon-picture"  style="vertical-align: middle"></i> {{'ADD_PROFILE_PHOTO' | translate}}</button>
        </div>
    </center>                       
    <input id="addMainPhoto" type="file" ng-file-select="onFileSelect($files, 'user', user.id)" class="hidden" accept="image/*">                        
</div>

控制器：

.controller('FileUploadCtrl', function ($scope, $upload, growl, API_SERVER_URL, ngProgress, PhotoService) {
      $scope.clickFileInput = function(id){
        $('#' + id).trigger('click');
      };
      $scope.onFileSelect = function($files, entity, id, action) {
        //$files: an array of files selected, each file has name, size, and type.
        console.log("BoatPhotoUploadCtrl-->entity:" + entity + "; id:" + id);
  ...

当我单击上传按钮时，出现下一个错误：

Error: $apply already in progress
        at Error (native)
        at beginPhase (http://localhost/lib/angular/angular.js:8334:40)
        at Object.$get.Scope.$digest (http://localhost/lib/angular/angular.js:7913:9)
        at HTMLDocument.link.T (http://localhost/lib/bootstrap/ui-bootstrap-tpls-0.6.0.min.js:1565:34)
        at HTMLDocument.x.event.dispatch (http://code.jquery.com/jquery-1.10.2.min.js:5:14129)
        at HTMLDocument.x.event.add.v.handle (http://code.jquery.com/jquery-1.10.2.min.js:5:10873)
        at Object.x.event.trigger (http://code.jquery.com/jquery-1.10.2.min.js:5:13255)
        at HTMLInputElement.<anonymous> (http://code.jquery.com/jquery-1.10.2.min.js:5:20776)
        at Function.x.extend.each (http://code.jquery.com/jquery-1.10.2.min.js:4:5347)
        at x.fn.x.each (http://code.jquery.com/jquery-1.10.2.min.js:4:1999)

我没有自己使用$apply，这很奇怪，因为我使用相同的插件在应用程序的其他部分上传照片并且它工作正常。

Answer 1

$('#' + id).trigger('click'); - this line causes an error