angular下H5上传图片（可多张上传）

最近做的项目中用到了angular下上传图片功能，在做的过程中遇到了许多问题，最终都得以解决

angular上传时和普通上传时过程差不多，只不过是要不一些东西转化为angular的东西。

1.ng-file-select,指令angular是没此功能的，其实也是转化成了change事件，不多说，直接上代码

angular.module('myApp')
.directive('ngFileSelect', [ '$parse', '$timeout', function($parse, $timeout) {

        return function(scope, elem, attr) {

            var fn = $parse(attr['ngFileSelect']);

            elem.bind('change', function(evt) {

                var files = [], fileList, i;

                fileList = evt.target.files;

                if (fileList != null) {

                    for (i = 0; i < fileList.length; i++) {

                        files.push(fileList.item(i));

                    }

                }

                $timeout(function() {

                    fn(scope, {

                        $files : files,

                        $event : evt

                    });

                });

            });

        };

    }])

2.服务上传文件前预览并压缩图片功能

//上传文件预览

angular.module('myServers',[])

    .factory('fileReader', ['$q', '$log', function($q, $log) {

        var dataURItoBlob = function(dataURI) {

            // convert base64/URLEncoded data component to raw binary data held in a string

            var byteString;

            if (dataURI.split(',')[0].indexOf('base64') >= 0)

                byteString = atob(dataURI.split(',')[1]);

            else

                byteString = unescape(dataURI.split(',')[1]);  

            // separate out the mime component

            var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];  

            // write the bytes of the string to a typed array

            var ia = new Uint8Array(byteString.length);

            for (var i = 0; i < byteString.length; i++) {

                ia[i] = byteString.charCodeAt(i);

            }  

            return new Blob([ia], {

                type: mimeString

            });

       }; 

        var onLoad = function(reader, deferred, scope,file) {

            return function() {

                scope.$apply(function() {

                     var img = new Image();

                    //前端压缩图片

                    img.onload = function(){

                        //resize the image using canvas

                        var canvas = document.createElement("canvas");

                        var ctx = canvas.getContext("2d");

                        var width = img.width;

                        var height = img.height; 

                        var MAX_WIDTH = width>2500 ?  width/2 : 2500;

                        var MAX_HEIGHT = height>2500 ? height/2 : 2500;

                        if (width > height) {

                            if (width > MAX_WIDTH) {

                                height *= MAX_WIDTH / width;

                                width = MAX_WIDTH;

                            }

                        } else {

                            if (height > MAX_HEIGHT) {

                                width *= MAX_HEIGHT / height;

                                height = MAX_HEIGHT;

                            }

                        }

                        canvas.width = width ;

                        canvas.height = height; 

                        ctx.drawImage(img, 0, 0, width, height);  

                        var dataURL = canvas.toDataURL('image/jpeg', 1);

                        var blob = dataURItoBlob(dataURL);

                        if(blob.size > 2000 * 1024){

                            dataURL = canvas.toDataURL('image/jpeg', .2);

                        }else if(blob.size > 1000 * 1024){

                            dataURL = canvas.toDataURL('image/jpeg', .5);

                        }else{

                            dataURL = canvas.toDataURL('image/jpeg', .8);

                        }

                        blob = dataURItoBlob(dataURL);

                        deferred.resolve(blob);

                    }

                    img.src = URL.createObjectURL(file);

                });

            };

        };

        var onError = function(reader, deferred, scope) {

            return function() {

                scope.$apply(function() {

                    deferred.reject(reader.result);

                });

            };

        };

        var onProgress = function(reader, scope) {

            return function(event) {

                scope.$broadcast("fileProgress", {

                    total: event.total,

                    loaded: event.loaded

                });

            };

        };

        var getReader = function(deferred, scope, file) {

            var reader = new FileReader();

            reader.onload = onLoad(reader, deferred, scope,file);

            reader.onerror = onError(reader, deferred, scope);

            reader.onprogress = onProgress(reader, scope);

            return reader;

        };

        var readAsDataURL = function(file, scope) {

            var deferred = $q.defer();

            var reader = getReader(deferred, scope,file);

            reader.readAsDataURL(file);

            return deferred.promise;

        };

        return {

            readAsDataUrl: readAsDataURL

        };

    }]);

这里说明一下，部分代码是参考别人的代码（http://blog.csdn.net/zx007fack/article/details/41073601），但是对其中内容做了修改，因为用原来的代码，如果不加前端压缩功能是正常的，前端压缩的话因为要用到canvas, 直接用reader.result在ios上图片的宽高拿到的直接是0，android上是可以的，具体原因不是很确定是不是base64的问题，所以我又直接把file传了进来，然后用原生js的方法新建图片元素拿到宽高，再用Canvas进行压缩，最后转成blob，通过formData传给后台。

3.controller代码

//选择图片后执行的方法

        $scope.fileArr = [];

        $scope.imgSrcArr = [];var i = 0; //为ios上图片都为image时添加序号

        $rootScope.onFileSelect = function(files, event) {

            //预览上传图片开始

            $rootScope.startLoading();

            var $this = angular.element(event.target);

            angular.forEach(files, function(value, index) {

                var fileIn = value;

                var fileInName = fileIn.name;

                var fileType = fileInName.substring(fileInName.lastIndexOf(".") + 1, fileInName.length);

                //解决ios下所有图片都为image.jpg的bug

                if(fileIn) {

                    fileInName = fileInName.split('.')[0] + i + '.' + fileType;

                    i++;

                }

                attachvo.push({

                    name: fileInName,

                    type: fileType

                });

                fileReader.readAsDataUrl(fileIn, $scope)

                    .then(function(result) {

                        result.name = fileInName;

                        $scope.fileArr.push(result);

                        $scope.imgSrcArr.push(URL.createObjectURL(result));
　　　　　　　　　　　　　　//每次上传后清空file框，确保每次都能调用change事件

                        document.querySelector('.upload').reset();

                    });

                $scope.$on('fileProgress', function(event, data) {

                    if(data.total == data.loaded) {

                        $timeout(function() {

                            //上传图片结束

                            $rootScope.endLoading();

                        }, 200)

                    }

                });            

            });

            $rootScope.showAttachment = false;

        };return false;

        }

这里处理了下图片，在名字上加了序号，因为在ios上每次选择的图片名字都叫image,查找了很多资料，说是safari的bug,后面版本才会解决，暂时只能以这种方式解决了。循环是上传多张图片

3.html代码

<ul class="upload-view-ul">

        <li ng-repeat="src in imgSrcArr" class="pull-left" ng-click="delCurUpload(src)"

            ng-class="{'row-last': (($index+1) % 5==0)}">

            <span>x</span>

            <em ng-if='nrc'>{{formData.attachvo[$index].attachmentType}}</em>

            <img ng-src="{{src}}">

        </li>

        <div class="attachment" pop-type-select ng-if="nrc">+</div>

        <div class="attachment" ng-if="!nrc">

            +

            <form class="upload">

                <input type="file" name="file[]"  ng-file-select="onFileSelect($files, $event)" multiple>

            </form>

        </div>

    </ul>

4.顺便把formdata时代码贴一下，采用H5上传图片的方式

this.FormdataPost = function(pathUrl, formId, formData, files) {

        var fd = new FormData();

        fd.append('formId', formId);

        if(files && angular.isArray(files)) {

            files.forEach(function(item) {

                fd.append('file', item, item.name);

            });

        }

        fd.append('formData', angular.toJson(formData, true));

        var httpConfig = {

            headers: {

                'Authorization': 'Bearer ' + this.token,

                'Content-Type': undefined

            },

            transformRequest: angular.identity

        };

        return $http.post(rootUrl + pathUrl, fd, httpConfig).then(function(data) {

            return data;

        }).catch(function(error) {

            $rootScope.interfaceName = pathUrl;

            $rootScope.setNewWortStatus({

                status: error.status,

                errInfo: error.data && error.data.statusInfo || ''

            });

            return error;

        });

    }

思路有一点混乱，不知道讲清楚了没有，想起来再添加吧

巴特西

angular下H5上传图片（可多张上传）

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