1 概述
编写后台网站程序大多数用到文件上传,可是传统的文件上传控件不是外观不够优雅,就是性能不太好看,翻阅众多文件上传控件的文章,发现可以这样去定义一个文件上传控件,实现的文件上传的效果图如下:
2、该图片上传插件实现功能如下:
1>能够异步上传,上传成功之后,服务器返回响应结果;能够定义上传前和上传后自定义处理方式;
2>能够实现文件格式判断,过滤非图片文件;
3>服务端能够过滤重复上传的图片;
3、页面代码分析:
1>、Jquery图片上传插件代码如下:
// 选中文件, 提交表单(开始上传) (function ($) { var iframe; var form; var opeartData=null; $.uploadDefault = { url: \'\', fileName: \'filedata\', dataType: \'json\', imgshow: \'\', onSend: function(){ return true; }, onSubmit: function () { return true; }, onComplate: function () { return true; } }; $.UpLoadForm = { //图片格式验证 $PicChange: function (obj) { if (opeartData.imgshow != null && opeartData.imgshow != \'\') { $("#" + opeartData.imgshow).val($(obj).val()); } }, //判断pic格式是否正确 $IsPicCheck: function (fileName) { if (fileName != null && fileName != "") { //lastIndexOf如果没有搜索到则返回为-1 if (fileName.lastIndexOf(".") != -1) { var fileType = (fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length)).toLowerCase(); var suppotFile = new Array(); suppotFile[0] = "jpg"; suppotFile[1] = "gif"; suppotFile[2] = "bmp"; suppotFile[3] = "png"; suppotFile[4] = "jpeg"; for (var i = 0; i < suppotFile.length; i++) { if (suppotFile[i] == fileType) { return true; } else { continue; } } return false; } else { return false; } } }, $ImgUpLoad: function () { if (opeartData == null) { //没有选择图片或者图片已经上传 return; } opeartData = $.extend($.uploadDefault, opeartData); var canSend = opeartData.onSend(); if (!canSend) { return; } if (!opeartData.onSubmit())//图片验证 { return; } form.submit(); iframe.load(function() { var contents = $(this).contents().get(0); var data = $(contents).find(\'body\').text(); if (\'json\' == opeartData.dataType) { data = window.eval(\'(\' + data + \')\'); } opeartData.onComplate(data); setTimeout(function() { iframe.remove(); form.remove(); opeartData = null; }, 5000); }); }, $OpenFIle: function (options) { opeartData = $.extend($.uploadDefault, options); if (opeartData.url == \'\') { return; } var frameName = \'upload_frame_0\'; var formName = \'upload_form_0\'; if ($("#" + formName).length > 0) { iframe = $("#" + frameName); form = $("#" + formName); } else { iframe = $(\'<iframe style="position:absolute;top:-9999px" id="\' + frameName + \'" />\').attr(\'name\', frameName); form = $(\'<form method="post" style="display:none;" id="\' + formName + \'" enctype="multipart/form-data" />\').attr(\'name\', \'form_\' + frameName); form.attr("target", frameName).attr(\'action\', opeartData.url); // form中增加数据域 var formHtml = \'<input type="file" name="\' + opeartData.fileName + \'" onchange="$.UpLoadForm.$PicChange(this)")"/>\'; form.append(formHtml); iframe.appendTo("body"); form.appendTo("body"); } var fileInput = $(\'input[type=file][name=\' + opeartData.fileName + \']\', form); fileInput.click(); } } })(jQuery);
2>前台页面调用代码如下,Jquery插件,别忘记引入Jquery对应js:
<script type="text/javascript"> $(function () { $("#imagetx").bind("click", function () { $.UpLoadForm.$OpenFIle({ // 上传地址 url: \'../upload/UploadImg\', // 文件域名字 fileName: \'upimage\', // 其他表单数据 imgshow: \'imagetx\', // 上传完成后, 返回json, text dataType: \'json\', // 上传之前回调,return true表示可继续上传 onSend: function () { $.ShowLoadDialog(); return true; }, onSubmit: function () { var picpath = $("#imagetx").val(); console.log(picpath); if (!$.UpLoadForm.$IsPicCheck(picpath)) { $.ShowLoadDialogClose(); $TipDialog("图片上传", "请上传jpg、gif、bmp、png、jpeg格式的图片!"); return false; } return true; }, // 上传之后回调 onComplate: function (data) { $.ShowLoadDialogClose(); if (data != null) { console.log(data) if (data.errorcode == "200") { $("#showpic").attr("src", data.picurl); } else { $TipDialog("图片上传", "图片上传失败"); } } } }); }); $("#btnupload").bind("click", function () { $.UpLoadForm.$ImgUpLoad(); }) }); </script>
3>后台服务器验证:
[HttpPost] public JsonResult UploadImg(HttpPostedFileBase upimage) { string pic = "", error = "001",pcode=""; try { if (upimage != null) { string fileName = DateTime.Now.ToString("yyyyMMdd") + System.IO.Path.GetFileName(upimage.FileName); string[] pictext = { ".jpg",".gif",".bmp",".png",".jpeg" }; string extenname= System.IO.Path.GetExtension(fileName); if (pictext.Contains(extenname)) { string filePhysicalPath = Server.MapPath("~/Upload/Images/" + fileName); upimage.SaveAs(filePhysicalPath); pic = "/Upload/Images/" + fileName; } else { error = "200"; pic =pic ; } } } } catch (Exception ex) { error = ex.Message; } return Json(new { errorcode = error, picurl = pic, piccode = pcode }); }
图片上传也就完成,展示的效果也如上面所示;