/**
 * Created by joesbell on 2016/10/21.
 */
/**/

var ZXXFILE = {
    fileInput: null,                //html file控件
    dragDrop: null,                    //拖拽敏感区域
    upButton: null,                    //提交按钮
    url: "",                        //ajax地址
    fileFilter: [],                    //过滤后的文件数组
    filter: function(files) {        //选择文件组的过滤方法
        return files;
    },
    onSelect: function() {},        //文件选择后
    onDelete: function() {},        //文件删除后
    onDragOver: function() {},        //文件拖拽到敏感区域时
    onDragLeave: function() {},    //文件离开到敏感区域时
    onProgress: function() {},        //文件上传进度
    onSuccess: function() {},        //文件上传成功时
    onFailure: function() {},        //文件上传失败时,
    onComplete: function() {},        //文件全部上传完毕时

    /* 开发参数和内置方法分界线 */

    //文件拖放
    funDragHover: function(e) {
        e.stopPropagation();
        e.preventDefault();
        this[e.type === "dragover"? "onDragOver": "onDragLeave"].call(e.target);
        return this;
    },
    //获取选择文件，file控件或拖放
    funGetFiles: function(e) {
        // 取消鼠标经过样式
        this.funDragHover(e);

        // 获取文件列表对象
        var files = e.target.files || e.dataTransfer.files;
        //继续添加文件
        this.fileFilter = this.fileFilter.concat(this.filter(files));
        this.funDealFiles();
        return this;
    },

    //选中文件的处理与回调
    funDealFiles: function() {
        for (var i = 0, file; file = this.fileFilter[i]; i++) {
            //增加唯一索引值
            file.index = i;
        }
        //执行选择回调
        this.onSelect(this.fileFilter);
        return this;
    },

    //删除对应的文件
    funDeleteFile: function(fileDelete) {
        var arrFile = [];
        for (var i = 0, file; file = this.fileFilter[i]; i++) {
            if (file != fileDelete) {
                arrFile.push(file);
            } else {
                this.onDelete(fileDelete);
            }
        }
        this.fileFilter = arrFile;
        return this;
    },

    //文件上传
    funUploadFile: function() {
        var self = this;
        if (location.host.indexOf("sitepointstatic") >= 0) {
            //非站点服务器上运行
            return;
        }
        for (var i = 0, file; file = this.fileFilter[i]; i++) {
            (function(file) {
                var xhr = new XMLHttpRequest();
                if (xhr.upload) {
                    // 上传中
                    xhr.upload.addEventListener("progress", function(e) {
                        self.onProgress(file, e.loaded, e.total);
                    }, false);

                    // 文件上传成功或是失败
                    xhr.onreadystatechange = function(e) {
                        if (xhr.readyState == 4) {
                            if (xhr.status == 200) {
                                self.onSuccess(file, xhr.responseText);
                                self.funDeleteFile(file);
                                if (!self.fileFilter.length) {
                                    //全部完毕
                                    self.onComplete();
                                }
                            } else {
                                self.onFailure(file, xhr.responseText);
                            }
                        }
                    };

                    // 开始上传
                    xhr.open("POST", self.url, true);
                    xhr.setRequestHeader("X_FILENAME", encodeURIComponent(file.name));
                    xhr.send(file);
                }
            })(file);
        }

    },

    init: function() {
        var self = this;
        if (this.dragDrop) {
            this.dragDrop.addEventListener("dragover", function(e) { self.funDragHover(e); }, false);
            this.dragDrop.addEventListener("dragleave", function(e) { self.funDragHover(e); }, false);
            this.dragDrop.addEventListener("drop", function(e) { self.funGetFiles(e); }, false);
        }

        //文件选择控件选择
        if (this.fileInput) {
            this.fileInput.addEventListener("change", function(e) { self.funGetFiles(e); }, false);
        }

        //上传按钮提交
        if (this.upButton) {
            this.upButton.addEventListener("click", function(e) { self.funUploadFile(e); }, false);
        }
    }
};

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <style>
        .upload_box{width:800px; margin:1em auto;}
        .upload_main{border-width:1px 1px 2px; border-style:solid; border-color:#ccc #ccc #ddd; background-color:#fbfbfb;}
        .upload_choose{padding:1em;}
        .upload_drag_area{display:inline-block; width:60%; padding:4em 0; margin-left:.5em; border:1px dashed #ddd; background:#fff url(./drag.png) no-repeat 20px center; color:#999; text-align:center; vertical-align:middle;}
        .upload_drag_hover{border-color:#069; box-shadow:inset 2px 2px 4px rgba(0, 0, 0, .5); color:#333;}
        .upload_preview{border-top:1px solid #bbb; border-bottom:1px solid #bbb; background-color:#fff; overflow:hidden; _zoom:1;}
        .upload_append_list{height:300px; padding:0 1em; float:left; position:relative;}
        .upload_delete{margin-left:2em;}
        .upload_image{max-height:250px; padding:5px;}
        .upload_submit{padding-top:1em; padding-left:1em;}
        .upload_submit_btn{display:none; height:32px; font-size:14px;}
        .upBtnWarp{
            position: relative;
            display: inline-block;
            width: 100px;
            height: 40px;
            overflow: hidden;
            background:deepskyblue;
            color: white;
            text-align: center;
            line-height: 40px;
            border-radius: 5px;
        }
        .upBtn{
            position: absolute;
            font-size: 100px;
            right: 0;
            top: 0;
            bottom: 0;
            cursor: pointer;
        }
        .upload_loading{height:250px; background:url(/study/image/preload.gif) no-repeat center;}
        .upload_progress{display:none; padding:5px; border-radius:10px; color:#fff; background-color:rgba(0,0,0,.6); position:absolute; left:25px; top:45px;}
    </style>
</head>

<body>
<div id="main">
    <h1>基于HTML5的多图Ajax上传实例页面</h1>
    <div id="body" class="light">
        <div id="content" class="show">
            <div class="demo">
                <form id="uploadForm" action="upload.php" method="post" enctype="multipart/form-data">
                    <div class="upload_box">
                        <div class="upload_main">
                            <div class="upload_choose">
                                <div class="upBtnWarp">
                                    上传图片
                                    <input id="fileImage" class="upBtn" type="file" size="30" name="fileselect[]" multiple />
                                </div>
                                <span id="fileDragArea" class="upload_drag_area">或者将图片拖到此处</span>
                            </div>
                            <div id="preview" class="upload_preview"></div>
                        </div>
                        <div class="upload_submit">
                            <button type="button" id="fileSubmit" class="upload_submit_btn">确认上传图片</button>
                        </div>
                        <div id="uploadInf" class="upload_inf"></div>
                    </div>
                </form>
            </div>
        </div>
    </div>
</div>
<script src="http://libs.baidu.com/jquery/1.4.4/jquery.js"></script>
<script src="./FileLoader.js"></script>
<script>
    var params = {
        fileInput: $("#fileImage").get(0),
        dragDrop: $("#fileDragArea").get(0),
        upButton: $("#fileSubmit").get(0),
        url: $("#uploadForm").attr("action"),
        filter: function(files) {
            var arrFiles = [];
            for (var i = 0, file; file = files[i]; i++) {
                if (file.type.indexOf("image") == 0) {
                    if (file.size >= 512000) {
                        alert(‘您这张"‘+ file.name +‘"图片大小过大，应小于500k‘);
                    } else {
                        arrFiles.push(file);
                    }
                } else {
                    alert(‘文件"‘ + file.name + ‘"不是图片。‘);
                }
            }
            return arrFiles;
        },
        onSelect: function(files) {
            var html = ‘‘, i = 0;
            $("#preview").html(‘<div class="upload_loading"></div>‘);
            var funAppendImage = function() {
                file = files[i];
                if (file) {
                    var reader = new FileReader()
                    reader.onload = function(e) {
                        html = html + ‘<div id="uploadList_‘+ i +‘" class="upload_append_list"><p><strong>‘ + file.name + ‘</strong>‘+
                                ‘<a href="javascript:" class="upload_delete" title="删除" data-index="‘+ i +‘">删除</a><br />‘ +
                                ‘<img id="uploadImage_‘ + i + ‘" src="http://www.mamicode.com/‘ + e.target.result + ‘" class="upload_image" /></p>‘+
                                ‘<span id="uploadProgress_‘ + i + ‘" class="upload_progress"></span>‘ +
                                ‘</div>‘;

                        i++;
                        funAppendImage();
                    }
                    reader.readAsDataURL(file);
                } else {
                    $("#preview").html(html);
                    if (html) {
                        //删除方法
                        $(".upload_delete").click(function() {
                            ZXXFILE.funDeleteFile(files[parseInt($(this).attr("data-index"))]);
                            return false;
                        });
                        //提交按钮显示
                        $("#fileSubmit").show();
                    } else {
                        //提交按钮隐藏
                        $("#fileSubmit").hide();
                    }
                }
            };
            funAppendImage();
        },
        onDelete: function(file) {
            $("#uploadList_" + file.index).fadeOut();
        },
        onDragOver: function() {
            $(this).addClass("upload_drag_hover");
        },
        onDragLeave: function() {
            $(this).removeClass("upload_drag_hover");
        },
        onProgress: function(file, loaded, total) {
            var eleProgress = $("#uploadProgress_" + file.index), percent = (loaded / total * 100).toFixed(2) + ‘%‘;
            eleProgress.show().html(percent);
        },
        onSuccess: function(file, response) {
            $("#uploadInf").append("<p>上传成功，图片地址是：" + response + "</p>");
        },
        onFailure: function(file) {
            $("#uploadInf").append("<p>图片" + file.name + "上传失败！</p>");
            $("#uploadImage_" + file.index).css("opacity", 0.2);
        },
        onComplete: function() {
            //提交按钮隐藏
            $("#fileSubmit").hide();
            //file控件value置空
            $("#fileImage").val("");
            $("#uploadInf").append("<p>当前图片全部上传完毕，可继续添加上传。</p>");
        }
    };
    ZXXFILE = $.extend(ZXXFILE, params);
    ZXXFILE.init();
</script>
</body>
</html>