深入学习jquery源码之上传附件插件的实现
/**
* 上传附件通用JS （基于layerUI）
*/
;(function($){
var defaults = {
url : "/attach/upload",
fieldCode : "aboutDocument", //业务字段编码
fieldName : "相关文件", //业务字段名称
entityName : "template", //业务实体
};
function renderUpload(options){
this.settings = $.extend({},defaults,options);
this.settings.elem = "#" + this.settings.fieldCode;
this.settings.bindAction = "#" + this.settings.fieldCode + "_Action"; //上传操作按钮
this.settings.layuiUploadPreview = "#"+ this.settings.fieldCode +"_preview";
this.settings.previewTableBody = "#"+ this.settings.fieldCode +"_Preview_Table"; //上传预览表格
this.init();
}
//为函数添加原型链上的方法
renderUpload.prototype = {
init: function(){
var that = this;
var uploadInst = layui.upload.render({
elem: that.settings.elem //绑定元素
,url: CONTEXT_PATH + that.settings.url //上传接口
,accept:'file'
,data:{ //上传参数
"entityName" : that.settings.entityName, //业务实体
"fieldCode" : that.settings.fieldCode, //业务字段编码
"fieldName" : that.settings.fieldName, //业务字段名称
}
,auto:false //是否选完文件后自动上传 如果设定 false，那么需要设置 bindAction 参数来指向一个其它按钮提交上传
,size:0 //设置文件最大可允许上传的大小，单位 KB。不支持ie8/9; 0（即不限制）
,multiple:true
//是否允许多文件上传。设置 true即可开启。不支持ie8/9
,bindAction: that.settings.bindAction //指向一个按钮触发上传，一般配合 auto: false 来使用。值为选择器或DOM对象，如：bindAction: '#btn'
,choose: function(res){ //选择文件后的回调函数
var layIndex = layer.open({
type: 1,
title: "预览",
maxmin: false,
area : ['40%', '40%'],
content:$(that.settings.layuiUploadPreview).removeAttr('style'), //$.loadHtml(preUrl),
success: function(layero){
var demoListView = $(that.settings.previewTableBody).empty();
var files = that.settings.selfFiles = res.pushFile(); //将每次选择的文件追加到文件队列
//读取本地文件
res.preview(function(index, file, result){
var tr = $(['<tr id="upload-'+ index +'">'
,'<td>'+ file.name +'</td>'
,'<td>'+ (file.size/1024).toFixed(1) +' kb</td>'
,'<td name="upload-status">等待上传</td>'
,'<td>'
,'<button class="layui-btn layui-btn-mini demo-reload layui-hide">重传</button>'
,'<button class="layui-btn layui-btn-mini layui-btn-danger demo-delete">删除</button>'
,'</td>'
,'</tr>'].join(''));
//单个重传
tr.find('.demo-reload').on('click', function(){
res.upload(index, file);
});
//删除
tr.find('.demo-delete').on('click', function(){
delete files[index]; //删除对应的文件
tr.remove();
uploadInst.config.elem.next()[0].value = ''; //清空 input file 值，以免删除后出现同名文件不可选
if(Object.getOwnPropertyNames(files).length == 0){ //当上传预览没有文件时，关闭弹出框
layer.close(layIndex);
}
});
demoListView.append(tr);
});
},
end : function(){ //layer销毁回调
$(that.settings.layuiUploadPreview).attr('style','display:none;');
$(that.settings.previewTableBody).empty();
},
cancel: function(){ //右上角关闭回调
}
});
}
,before: function(res){ //文件提交上传前的回调
$("tr",$(that.settings.previewTableBody)).find("td[name='upload-status']").text("上传中...");
}
,done: function(res, index, upload){ //执行上传请求后的回调。返回三个参数，分别为：res（服务端响应信息）、index（当前文件的索引）、upload（重新上传的方法，一般在文件上传失败后使用）
//上传完毕回调 "dealPicture_list_table"
if(res && res.status == WebConst.SUCCESS){
$(that.settings.bindAction).text("").text("上传成功");
delete that.settings.selfFiles[index];
//改变预览状态,将上传附件id存在 隐藏域中
$("tr[id='upload-"+ index +"']",$(that.settings.previewTableBody)).find("td[name='upload-status']").text("附件缓存完毕，请点击提交上传附件");
var unupload = $("#uploadAttachmentIds").data("uploadAttachmentIds");
if(unupload){
unupload.push(res.data['attachmentId']);
$("#uploadAttachmentIds").data("uploadAttachmentIds",unupload);
}else{
if(res.data){
$("#uploadAttachmentIds").data("uploadAttachmentIds",[res.data['attachmentId']]);
/**
* 第一个方法赋不了值，通过下面的赋值
*/
$("#uploadAttachmentIds").val([res.data['attachmentId']]);
}
}
//处理卡片页面列表展示问题
var afile = res.data;
var attachImg = "";
if(!$.isEmptyStr(afile.fileName) && (afile.fileName.indexOf('docx')!=-1
|| afile.fileName.indexOf('doc')!=-1))
{
//attachImg = '<td><img src="' + CONTEXT_PATH +"platform/common/images/word.png" /></td>';
attachImg = '<td><img src="'+CONTEXT_PATH+ '/platform/common/images/word.png"' +'width="100" height="60" style="cursor:pointer;"/></td>';
}
else if(!$.isEmptyStr(afile.fileName) && afile.fileName.indexOf('pdf')!=-1)
{
attachImg = '<td><img src="'+CONTEXT_PATH+ '/platform/common/images/pdf.png"' +'width="100" height="60" style="cursor:pointer;"/></td>';
}
else
{
attachImg = '<td><img src="' + CONTEXT_PATH + '/attach/showPicture?attachmentId='
+ afile.attachmentId + '&isThumbnail=true" max-width="120" width="100" height="60" style="cursor:pointer;"/></td>';
}
var $tr = $(['<tr id="upload-'+ afile.attachmentId +'" attatchmentId="'+ afile.attachmentId +'">'
, attachImg
,'<td>'+ afile.fileName +'</td>'
,'<td>'+ afile.fileSize +' kb</td>'
,'<td>'+ afile.createDate +'</td>'
,'<td>'
,'<a class="layui-btn layui-btn-mini demo-reload" href="'+ CONTEXT_PATH +'/attach/download?attachmentId='+ afile.attachmentId +'">下载</a> '
,'<button class="layui-btn layui-btn-mini layui-btn-danger">删除</button>'
,'</td>'
,'</tr>'].join(''));
$tr.find('button').on('click',function(){
var attId = $(this).closest("tr").attr('attatchmentId');
var url = CONTEXT_PATH + '/attach/delete/datafile';
var rlt = $.getData(url,{'attachmentIds':attId});
if(rlt && rlt.status == WebConst.SUCCESS){
$(this).closest("tr").remove();
$("#uploadAttachmentIds").data("uploadAttachmentIds").removeByValue(attId);
}
return false;
});
$("#" + afile.fieldCode + "_list_table").append($tr);
}
}
,error: function(index, upload){ //执行上传请求出现异常的回调（一般为网络异常、URL 404等）。返回两个参数，分别为：index（当前文件的索引）、upload（重新上传的方法）
//请求异常回调
}
});
}
}
//扩展jquery类方法
$.extend({
renderUpload : function(options){
return new renderUpload(options);
}
});
})(jQuery);
如何使用:
//执行实例
$.renderUpload({
fieldName : "上传附件", //业务字段名称
fieldCode : "dealPicture", //业务字段编码
entityName : "add", //业务实体
selfFiles : _self.files
});
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