按鈕點選觸發Ajax非同步上傳檔案(附加:table點選按鈕刪除行)
阿新 • • 發佈:2019-01-07
一、使用背景
1、在專案中需要點選按鈕即上傳檔案,提交表單時只需要儲存檔案ID即可;
2、同一個表單中有多處需要上傳檔案,多個按鈕非同步上傳檔案互不影響;
3、java後臺使用同一個檔案上傳介面。
二、利用ajaxfileupload.js實現檔案非同步上傳
ajaxfileupload.js在網上很多地方都有下載,但是很多都是經過別人修改之後的,不一定會適用。此處的ajaxfileupload.js也是本人為適應需求修改之後的,請認真閱讀後再自行選擇下載。
注:文章最後會以程式碼形式貼出來原始碼,並對修改處做解釋。
三、前端頁面程式碼
在引入ajaxfileupload.js之前需要引入jquery.js,下面提供了jquery-3.3.1的下載路徑。
<!-- 引入jquery --> <script src="${basepath}/static/jquery-3.3.1/jquery-3.3.1.js" type="text/javascript"></script> <!-- 引入ajaxfileupload --> <script src="${basepath}/static/ajaxfileupload.js" type="text/javascript"></script> <!-- 引入layer外掛 --> <script src="${basepath}/layer-v3.1.1/layer/layer.js"></script> <script src="${basepath}/layer-v2.3/layer/laydate/laydate.js"></script> <!-- 表單部分 --> <form action="" method="post"> <table cellpadding="0" cellspacing="0" border="0" class="table_fix tzdl_table_style"> <tr> <td class=" common_label_title_r"> <font style="color:red;">* </font>專案名稱: </td> <td colspan="3"> <input id="xmmc" name="xmmc" value="" class="form-control" /> </td> </tr> <tr> <td class=" common_label_title_r"> <font style="color:red;">* </font>專案總投資: </td> <td> <input id="zmztz" name="zmztz" value="" class="form-control" /> </td> <td class=" common_label_title_r"> <font style="color:red;">* </font>年度報告時間: </td> <td> <input id="ndbgsj" name="ndbgsj" value="" class="form-control" /> </td> <tr height="80px;"> <input type="hidden" id="jdbg" name="jdbg"" value=""/> <td class=" common_label_title_r"> <font style="color:red;">* </font>季度報告檔案: </td> <td colspan="3" id="name_jdbg""> <input type="file" id="upload_jdbg" name="upload_jdbg" style="display:inline-block;"/> <a onclick="ajaxUpload('jdbg')" class="btn btn-success btn-sm pull-right">上 傳</a> </td> </tr> <tr height="80px;"> <input type="hidden" id="ndbg" name="ndbg"" value=""/> <td class=" common_label_title_r"> <font style="color:red;">* </font>年度報告檔案: </td> <td colspan="3" id="name_ndbg""> <input type="file" id="upload_ndbg" name="upload_ndbg" style="display:inline-block;"/> <a onclick="ajaxUpload('ndbg')" class="btn btn-success btn-sm pull-right">上 傳</a> </td> </tr> </form> <!-- 檔案上傳js部分 --> <script type="text/javascript"> function ajaxUpload($id){ var file = $("#upload_" + $id).val(); if (file == null || file == "") { layer.msg("請先選擇檔案!", {icon: 3}); } else { $.ajaxFileUpload({ fileElementId: "upload_" + $id, // 需要上傳的檔案域的ID,即<input type="file">的ID。 url: '/uploadFile', // 後臺方法的路徑 type: 'post', // 當要提交自定義引數時,這個引數要設定成post dataType: 'text', //伺服器返回的資料型別。可以為xml,script,json,html。如果不填寫,jQuery會自動判斷。 secureuri: false, //是否啟用安全提交,預設為false。 async : true, //是否是非同步 success: function(data) { //提交成功後自動執行的處理函式,引數data就是伺服器返回的資料。 var jsonStr = data.substring(data.indexOf("{"), data.lastIndexOf("}") + 1); var jsonObject = JSON.parse(jsonStr); if (jsonObject.success == true) { var data = jsonObject.body; layer.msg("上傳附件成功!", {icon: 6}); changeStatus($id, data); } else { layer.msg("上傳附件失敗!", {icon: 5}); } }, error: function(data, status, e) { //提交失敗自動執行的處理函式。 layer.msg("上傳附件失敗!", {icon: 5}); } }); } } function changeStatus($id, data){ var fileName = data.names[0]; var fileId = data.ids[0]; var tdName = $("#name_" + $id); tdName.html(fileName + "<button onclick=downLoadFile('"+fileId+"') class='btn btn-info btn-sm pull-right'>下 載</button> " + "<a onclick='deleteTr(this)' class='btn btn-danger btn-xs'> 刪 除 </a>" ); } function deleteTr($this){ var tr = $this.parentNode.parentNode; var tbody = tr.parentNode; tbody.removeChild(tr); } </script>
注:
1、檔案上傳按鈕點選事件傳入的ID,一定是與按鈕相對應的type="file"檔案域的ID;
2、dataType: 'text':雖然我後臺返回的是json,若此處設定為json,則檔案上傳成功也會進入error的回撥函式;
3、由於我這裡有多處檔案上傳,為了後臺統一介面實現,我在ajaxfileupload.js中修改了type="file"檔案域的name,統一為file,後臺接收引數名為file。
四、後臺java程式碼
@RequestMapping(value="uploadFile") @ResponseBody public AjaxJson uploadFile(@RequestParam(value="file", required=true) MultipartFile[] file){ AjaxJson result = new AjaxJson(); try { Map<String, String> map = fileService.uploadFile(file); String[] names = map.get("names").split(":"); String[] ids = map.get("ids").split(":"); result.put("names", names); result.put("ids", ids); result.setSuccess(true); } catch (Exception e) { result.setSuccess(false); e.printStackTrace(); } return result; }
五、ajaxfileupload.js原始碼(修改之後的)
jQuery.extend({
handleError: function( s, xhr, status, e ){
// If a local callback was specified, fire it
if ( s.error ) {
s.error.call( s.context || s, xhr, status, e );
}
// Fire the global callback
if ( s.global ) {
(s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
}
},
createUploadIframe: function(id, uri)
{
//create frame
var frameId = 'jUploadFrame' + id;
if(window.ActiveXObject) {
if(jQuery.browser.version=="9.0" || jQuery.browser.version=="10.0"){
var io = document.createElement('iframe');
io.id = frameId;
io.name = frameId;
}else if(jQuery.browser.version=="6.0" || jQuery.browser.version=="7.0" || jQuery.browser.version=="8.0"){
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)
{
//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);
oldElement.attr("name", "file");
var newElement = $(oldElement).clone(true);
// 修改舊元素的id
$(oldElement).attr('id', fileId);
// 將新元素的值賦空
$(newElement).attr("value", "");
// 將新元素放在舊元素的位置
$(oldElement).before(newElement);
// 將舊元素移動到目標表單
$(oldElement).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 = s.fileElementId;
var form = jQuery.createUploadForm(id, s.fileElementId);
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;
}
})
注:點選按鈕實現檔案下載將在下一篇文章中體現