PUT reader上的ng-file-upload角度未定义

Question

我正在尝试更新模块而不上传新图像。 问题是，如果我不上传新图像，而是尝试使用从api中读取的图像，则在调试时会显示read.result is undefined 。 我认为读者期待图像流，而我给它一个URL。 不确定如何解决此问题。

该API接收作为图像的DataURL ，然后存储它，并将图像路径/ URL放入ImageURLPATH 。

码：

 angular.module('Services.modulesPUT', []) .service('modulesPUTSrvc', function (baseSrvc, $http,modulesGETSrvc,$rootScope,$state, myConfig) { var fObject = {}; fObject.myForm = {}; fObject.details = {}; fObject.imgObject = {}; fObject.put = function () { var imageData; if (fObject.myForm.$valid) { var reader = new window.FileReader(); reader.readAsDataURL(fObject.details.ImageURLPath); reader.onloadend = function () { $rootScope.loading = true; var result = $http({ method: "PUT", dataType: 'json', data: { "DataURI": reader.result }, url: myConfig.baseURL + 'odata/Modules(' + fObject.details.ModuleId + ')' }); result.success(function (data) { $rootScope.loading = false; baseSrvc.toastMessage('Module has successfully been updated.'); $state.go('base.modules.get'); }); result.error(function (data) { $rootScope.loading = false; baseSrvc.returnError(data); }); }; } else { baseSrvc.toastMessage('Please input all required fields.'); }; }; return fObject; }); 

 <div class="md-block" flex-gt-sm> <div class="imageUpload"> <md-tooltip md-direction="left"> Click here to select your image </md-tooltip> <div class="button" required ngf-select ng-model="srvcObject.details.DataURI" name="file" ngf-pattern="'image/*'" ngf-accept="'image/*'" ngf-max-size="20MB" ><span ng-show="!srvcObject.details.DataURI">Select <br/> Course Image</span></div> <div class="preview" ngf-src="srvcObject.details.ImageURLPath" ngf-background="srvcObject.details.ImageURLPath"></div> </div> </div>