html5 多图预览

html5 多图预览

 

如何实现呢?

页面加载完成之后,绑定事件:

 //预览图片,没有真正上传
            com.whuang.hsj.previewLocalDiskImageMultiple($('#pic-file'), $("#previewImage"),function () {
                if(uploadStatus==0) {//只要ajax上传成功一次,则不再校验.防止点击了选择图片,忘了ajax上传图片的情况
                    uploadStatus=1;
                }
            },6/*单位是M*/);

 com.whuang.hsj.previewLocalDiskImageMultiple的实现如下:

com.whuang.hsj.imgURL = null;
var URL = null;
var getImgUrl = function (file) {
    URL = window.URL || window.webkitURL;
    /*if (com.whuang.hsj.imgURL != null) {
     URL.revokeObjectURL(com.whuang.hsj.imgURL);//free the memory;
     }*/
    com.whuang.hsj.imgURL = URL.createObjectURL(file);
//                    $('body').append($('<img/>').attr('src', imgURL));
    var imgUrl2 = com.whuang.hsj.imgURL;
    return imgUrl2;
};

com.whuang.hsj.previewLocalDiskImageMultiple = function ($fileElement, $previewImage, callback, maxSizeM) {
    $fileElement.change(function (event) {
        var eventTarget = com.whuang.hsj.getSrcElement(event);
        var files = eventTarget.files;
        if (!maxSizeM) {
            maxSizeM = 2;
        }
        if (files && files.length > 0) {
            var $parentDiv = $previewImage.parent();
            $parentDiv.empty();
            for (var i = 0; i < files.length; i++) {
                var file = files[i];
                //console.log(file);

                /*if (file.size > 1024 * 1024 * maxSizeM) {
                 alert('image size Can\'t be more than ' + maxSizeM + 'MB');
                 event.returnValue = false;
                 return false;
                 }*/
                var imgUrl2 = getImgUrl(file);
                if ($parentDiv && $parentDiv.length && imgUrl2) {
                    $parentDiv.append($('<img style="max-width: 100%;" alt="暂无预览图片" id="previewImage" src="' + imgUrl2 + '"><hr color="red">'));
                }
            }

            if (typeof callback === 'function') {
                callback(com.whuang.hsj.imgURL);
            }
        }
    });
};

 上传图片的表单:

<form action="/image/upload" id="pic-form"  method="post" enctype="multipart/form-data" >
                            <input type="file" id="pic-file" name="image223" multiple > <br><br>
                            <input type="button" onclick="ajaxUploadFile(this)" id="upload_pic" value="ajax上传图片" > <span  id="upload_result_tip" ></span>
                        </form>

 

可以直接调用js:

http://blog.yhskyc.com/convention2/static/js/common_util.js