AngularJS实现图片上传和预览功能的方法分析

// <img id="img-preview">
var imgPreview = document.getElementById("img-preview");
// <input id="img-input" type="file">
var imgInput= document.getElementById("img-input");
imgInput.addEventListener("change", function(e){
 var imgFile = e.target.files[0]; // 获取上传的图片
 var reader = new FileReader();
 reader.readAsDataURL(imgFile ); // 将图片转成dataUri
 reader.onload = function(e) {
  imgPreview.src = e.target.result; //更新图片链接
 }
});

bower install angular-file-upload --save

var app = angular.module('my-app', [
  'angularFileUpload'
]);

<!--文件上传指令-->
<input type="file" nv-file-select="" uploader="uploader" />
<!--图片预览-->
<img id="img-preview" ng-src="{{iconUrl}}">

.controller('AppController', ['$scope', 'FileUploader', function($scope, FileUploader) {
    var uploader = $scope.uploader = new FileUploader({
      url: 'upload.php' //换成自己的上传地址，本地演示不换也行
    });
    uploader.onAfterAddingFile = function(fileItem) {
      var reader = new FileReader();
      reader.addEventListener("load", function (e) {
        //文件加载完之后，更新angular绑定
        $scope.$apply(function(){
          $scope.iconUrl = e.target.result;
        });
      }, false);
      reader.readAsDataURL(fileItem._file);
    };
}]);