Django实现图片文字同时提交的方法
本文实例讲述了Django实现图片文字同时提交的方法。分享给大家供大家参考。具体分析如下:
jQuery为我们网站开发解决了很多问题,使我们的网站用户体验大大的提高了。举个简单的例子,我们用AJAX技术来实现对表单的异步提交,使用户在体验上有了很大的改观,用户在提交数据的同时还可以干一些其他的事情。
不过,今天在开发中遇到一个特别头痛的问题,刚开始不知道,以为可以实现,纠结了将近4个小时之久,但结果很是令人失望。
问题是这样的:为了提高用户体验,我决定使用AJAX异步提交,于是我用jQuery的$.post去异步提交表单数据,文本信息可以很轻松的提交,但是,却怎么也无法提交图片数据。怎么办呢?
在网上查了很多资料,后来发现jQuery不支持图片上传(附件上传),但是有相关的插件,于是我开始慢慢琢磨,开始用另一个专门上传文件的插件jquery.ajaxfileupload.js,折腾了很久,总可以上传图片了。但是新的问题有产生了。
通过ajaxfileupload来异步上传图片的同时,却不能提交文本数据。囧啊…….
在网上查了很多资料,折腾了许久,没有Django开发的相关资料,怎么办?自己想办法…….
后来找到了解决方案,跟大家分享一下:
思路:
由于使用jquery.ajaxfileupload.js插件不能传递自定义的参数,肿么办?自己改写插件呗。碰巧,网上有别人改过的现成代码,二话不说,先拿来试试。以下即是我试验的过程。
1. 前台页面(部分代码):
<table border="0" width="100%"> <form action="." method="post" id="annex_form_2"></form> <tbody> <tr> <td class="col_name" nowrap="nowrap" width="26%">证书名称:</td> <td width="64%"><input size="65" class="input_general" id="prove_name_2" maxlength="50" name="prove_name" type="text"></td> <td nowrap="nowrap" width="7%"></td> <td nowrap="nowrap" width="3%"><a href="javascript:void(0);" onclick="SubmitAnnexInfo(2)" title="保存"><img src="/static/img/hr_manage/btn_save.gif" alt="点此保存"></a></td> </tr> <tr> <td class="col_name">证件类型:</td> <td><select id="prove_type_2" name="prove_type"> <option selected="selected" value="1">身份证</option> <option value="2">学位证</option> <option value="3">其他证</option> </select></td> <td> </td> <td> </td> </tr> <tr> <td class="col_name">证书描述:</td> <td><input size="80" class="input_general" id="prove_desc_2" maxlength="60" name="prove_desc" type="text"></td> <td> </td> <td> </td> </tr> <tr> <td class="col_name">附件地址:</td> <td><input size="45" class="input_general" id="prove_url_2" maxlength="45" name="prove_url" style="border:0px;" type="file"></td> <td> </td> <td> </td> </tr> <tr> <td colspan="4"> <hr> </td> </tr> </tbody> </table>
2. 更改后的jquery.ajaxfileupload.js:
jQuery.extend({ createUploadIframe: function(id, uri) { //create frame var frameId = 'jUploadFrame' + id; if(window.ActiveXObject) { var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />'); if(typeof uri== 'boolean'){ io.src = 'javascript:false'; } else if(typeof uri== 'string'){ io.src = uri; } } else { var io = document.createElement('iframe'); io.id = frameId; io.name = frameId; } io.style.position = 'absolute'; io.style.top = '-1000px'; io.style.left = '-1000px'; document.body.appendChild(io); return io }, createUploadForm: function(id, fileElementId, data) { //create form var formId = 'jUploadForm' + id; var fileId = 'jUploadFile' + id; var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>'); var oldElement = $('#' + fileElementId); var newElement = $(oldElement).clone(); $(oldElement).attr('id', fileId); $(oldElement).before(newElement); $(oldElement).appendTo(form); //增加文本参数的支持 if (data) { for (var i in data) { $('<input type="hidden" name="' + i + '" value="' + data[i] + '" />').appendTo(form); } } //set attributes $(form).css('position', 'absolute'); $(form).css('top', '-1200px'); $(form).css('left', '-1200px'); $(form).appendTo('body'); return form; }, ajaxFileUpload: function(s) { // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout s = jQuery.extend({}, jQuery.ajaxSettings, s); var id = new Date().getTime() var form = jQuery.createUploadForm(id, s.fileElementId, s.data); var io = jQuery.createUploadIframe(id, s.secureuri); var frameId = 'jUploadFrame' + id; var formId = 'jUploadForm' + id; // Watch for a new set of requests if ( s.global && ! jQuery.active++ ) { jQuery.event.trigger( "ajaxStart" ); } var requestDone = false; // Create the request object var xml = {} if ( s.global ) jQuery.event.trigger("ajaxSend", [xml, s]); // Wait for a response to come back var uploadCallback = function(isTimeout) { var io = document.getElementById(frameId); try { if(io.contentWindow) { xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null; xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document; }else if(io.contentDocument) { xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null; xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document; } }catch(e) { jQuery.handleError(s, xml, null, e); } if ( xml || isTimeout == "timeout") { requestDone = true; var status; try { status = isTimeout != "timeout" ? "success" : "error"; // Make sure that the request was successful or notmodified if ( status != "error" ) { // process the data (runs the xml through httpData regardless of callback) var data = jQuery.uploadHttpData( xml, s.dataType ); // If a local callback was specified, fire it and pass it the data if ( s.success ) s.success( data, status ); // Fire the global callback if( s.global ) jQuery.event.trigger( "ajaxSuccess", [xml, s] ); } else jQuery.handleError(s, xml, status); } catch(e) { status = "error"; jQuery.handleError(s, xml, status, e); } // The request was completed if( s.global ) jQuery.event.trigger( "ajaxComplete", [xml, s] ); // Handle the global AJAX counter if ( s.global && ! --jQuery.active ) jQuery.event.trigger( "ajaxStop" ); // Process result if ( s.complete ) s.complete(xml, status); jQuery(io).unbind() setTimeout(function() { try { $(io).remove(); $(form).remove(); } catch(e) { jQuery.handleError(s, xml, null, e); } }, 100) xml = null } } // Timeout checker if ( s.timeout > 0 ) { setTimeout(function(){ // Check to see if the request is still happening if( !requestDone ) uploadCallback( "timeout" ); }, s.timeout); } try { // var io = $('#' + frameId); var form = $('#' + formId); $(form).attr('action', s.url); $(form).attr('method', 'POST'); $(form).attr('target', frameId); if(form.encoding) { form.encoding = 'multipart/form-data'; } else { form.enctype = 'multipart/form-data'; } $(form).submit(); } catch(e) { jQuery.handleError(s, xml, null, e); } if(window.attachEvent){ document.getElementById(frameId).attachEvent('onload', uploadCallback); } else{ document.getElementById(frameId).addEventListener('load', uploadCallback, false); } return {abort: function () {}}; }, uploadHttpData: function( r, type ) { var data = !type; data = type == "xml" || data ? r.responseXML : r.responseText; // If the type is "script", eval it in global context if ( type == "script" ) jQuery.globalEval( data ); // Get the JavaScript object, if JSON is used. if ( type == "json" ) eval( "data = " + data ); // evaluate scripts within html if ( type == "html" ) jQuery("<div>").html(data).evalScripts(); //alert($('param', data).each(function(){alert($(this).attr('value'));})); return data; } })
3. 调用方法
//保存附件信息 function SaveAnnexInfo() { var prove_name = $("#id_prove_name").val(); //从界面得到值 var prove_type = $("#id_prove_type").val(); var prove_desc = $("#id_prove_desc").val(); $.ajaxFileUpload({ url: "/test/annex_info /", //请求的Url地址 secureuri:false, fileElementId:'id_prove_url', dataType: 'json', data: { //加入的文本参数 "prove_name":prove_name, "prove_type":prove_type, "prove_desc":prove_desc }, success: function(data) { asyncbox.tips('操作成功!', 'success'); }, error: function() { asyncbox.tips("上传失败,请检查文件是否符合格式要求。"); } }); }
4. Python后台处理(代码片段)
if annex_form.is_valid(): annex_info = annex_form.save(commit=False) #获取上传 annex_url = request.FILES.get('prove_url','') #取附件 annex_info.entry = entry_info annex_info.prove_url = annex_url annex_info.save() return HttpResponse(1) #操作成功 return HttpResponse(0) #操作失败
希望本文所述对大家的Python程序设计有所帮助。