打開google 搜索 ‘ajaxFileupload’ ‘多文件上傳’ 可以搜到許許多多類似的,那我爲什麼還要寫一下呢?
一個是對之前大神的貢獻表示感謝;二個是自己知識的總結;三個是自己在原有的基礎上改動了下,在此記錄,可能幫助其他朋友。
用過這個插件的都知道這個插件的基本用法,我就不廢話,直接上代碼。
我需要實現多個文件上傳,之前的做法是定義多個不同id的input,然後把ajaxfileuplod方法放在for循環裏,這個方法是在網上看到的,我覺得不怎麼好,後面在網上找到的,就高級點了,直接改源碼(因爲作者好久沒有跟新了,也確實滿足不了要求了)。接下來看看我是怎麼改的。
引用網上的做法:
1,看沒有修改前的代碼
- var oldElement = jQuery('#' + fileElementId);
- var newElement = jQuery(oldElement).clone();
- jQuery(oldElement).attr('id', fileId);
- jQuery(oldElement).before(newElement);
- jQuery(oldElement).appendTo(form);
很容易看出,這個就是把id爲什麼的input加到from裏去,那麼要實現多個文件上傳,就改成下面的樣子:
- if(typeof(fileElementId) == 'string'){
- fileElementId = [fileElementId];
- }
- for(var i in fileElementId){
- var oldElement = jQuery('#' + fileElementId[i]);
- var newElement = jQuery(oldElement).clone();
- jQuery(oldElement).attr('id', fileId);
- jQuery(oldElement).before(newElement);
- jQuery(oldElement).appendTo(form);
- }
這樣改之後,初始化的代碼就要這麼寫:
- $.ajaxFileUpload({
- url:'/ajax.php',
- fileElementId:['id1','id2']//原先是fileElementId:’id’ 只能上傳一個
- });
到這裏,確實可以上傳多個文件,但是對於我來說新問題又來,多個id,我的界面的文件不是固定的,是動態加載的,那麼id要動態生成,我覺得太麻煩,爲什麼不取name呢?然後把以上代碼改爲如下:
- if(typeof(fileElementId) == 'string'){
- fileElementId = [fileElementId];
- }
- for(var i in fileElementId){
- //按name取值
- var oldElement = jQuery("input[name="+fileElementId[i]+"]");
- oldElement.each(function() {
- var newElement = jQuery($(this)).clone();
- jQuery(oldElement).attr('id', fileId);
- jQuery(oldElement).before(newElement);
- jQuery(oldElement).appendTo(form);
- });
- }
這樣改了 那麼就可以實現多組多個文件上傳,接下來看我是怎麼應用的。
html:
- <div>
- <img id="loading" src="scripts/ajaxFileUploader/loading.gif" style="display:none;">
- <table cellpadding="0" cellspacing="0" class="tableForm" id="calculation_model">
- <thead>
- <tr>
- <th>多組多個文件</th>
- </tr>
- </thead>
- <tbody>
- <tr>
- <td>第一組</td>
- <td>第二組</td>
- </tr>
- <tr>
- <td><input type="file" name="gridDoc" class="input"></td>
- <td><input type="file" name="caseDoc" class="input"></td>
- </tr>
- </tbody>
- <tfoot>
- <tr>
- <td><button class="button" id="up1">Upload</button></td>
- <td><button class="button" id="addInput" >添加一組</button></td>
- </tr>
- </tfoot>
- </table>
- </div>
js:
- /**
- * Created with IntelliJ IDEA.
- * User: Administrator
- * Date: 13-7-3
- * Time: 上午9:20
- * To change this template use File | Settings | File Templates.
- */
- $(document).ready(function () {
- $("#up1").click(function(){
- var temp = ["gridDoc","caseDoc"];
- ajaxFileUpload(temp);
- });
- $("#addInput").click(function(){
- addInputFile();
- });
- });
- //動態添加一組文件
- function addInputFile(){
- $("#calculation_model").append(" <tr>"+
- "<td><input type='file' name='gridDoc' class='input'></td> "+
- "<td><input type='file' name='caseDoc' class='input'></td> "+
- "</tr>");
- }
- //直接使用下載下來的文件裏的demo代碼
- function ajaxFileUpload(id)
- {
- //starting setting some animation when the ajax starts and completes
- $("#loading").ajaxStart(function(){
- $(this).show();
- }).ajaxComplete(function(){
- $(this).hide();
- });
- /*
- prepareing ajax file upload
- url: the url of script file handling the uploaded files
- fileElementId: the file type of input element id and it will be the index of $_FILES Array()
- dataType: it support json, xml
- secureuri:use secure protocol
- success: call back function when the ajax complete
- error: callback function when the ajax failed
- */
- $.ajaxFileUpload({
- url:'upload.action',
- //secureuri:false,
- fileElementId:id,
- dataType: 'json'
- }
- )
- return false;
- }
我後臺是用的struts2,strtus2的上傳是比較簡單的,只要聲明約定的名字,即可得到文件對象,和名稱,代碼如下:
- package com.ssy.action;
- import com.opensymphony.xwork2.ActionSupport;
- import org.apache.commons.io.FileUtils;
- import org.apache.struts2.util.ServletContextAware;
- import javax.servlet.ServletContext;
- import java.io.*;
- import java.text.SimpleDateFormat;
- import java.util.Date;
- import java.util.Random;
- /**
- * Created with IntelliJ IDEA.
- * User: Administrator
- * Date: 13-7-2
- * Time: 下午4:08
- * To change this template use File | Settings | File Templates.
- */
- public class Fileupload extends ActionSupport implements ServletContextAware {
- private File[] gridDoc,caseDoc;
- private String[] gridDocFileName,caseDocFileName;
- private ServletContext context;
- public String execute(){
- for (int i = 0;i<gridDocFileName.length;i++) {
- System.out.println(gridDocFileName[i]);
- }
- for (int i = 0;i<caseDocFileName.length;i++) {
- System.out.println(caseDocFileName[i]);
- }
- //System.out.println(doc1FileName);
- //System.out.println(doc2FileName);
- String targetDirectory = context.getRealPath("/uploadFile");
- /*
- *這裏我只取得 第一組的文件進行上傳,第二組的類似
- */
- try{
- for (int i = 0; i < gridDoc.length; i++) {
- String targetFileName = generateFileName(gridDocFileName[i]);
- File target = new File(targetDirectory, targetFileName);
- FileUtils.copyFile(gridDoc[i], target);
- }
- }catch (Exception e){
- e.printStackTrace();
- }
- return SUCCESS;
- }
- public File[] getGridDoc() {
- return gridDoc;
- }
- public void setGridDoc(File[] gridDoc) {
- this.gridDoc = gridDoc;
- }
- public File[] getCaseDoc() {
- return caseDoc;
- }
- public void setCaseDoc(File[] caseDoc) {
- this.caseDoc = caseDoc;
- }
- public String[] getGridDocFileName() {
- return gridDocFileName;
- }
- public void setGridDocFileName(String[] gridDocFileName) {
- this.gridDocFileName = gridDocFileName;
- }
- public String[] getCaseDocFileName() {
- return caseDocFileName;
- }
- public void setCaseDocFileName(String[] caseDocFileName) {
- this.caseDocFileName = caseDocFileName;
- }
- /**
- * 用日期和隨機數格式化文件名避免衝突
- * @param fileName
- * @return
- */
- private String generateFileName(String fileName) {
- System.out.println(fileName);
- SimpleDateFormat sf = new SimpleDateFormat("yyMMddHHmmss");
- String formatDate = sf.format(new Date());
- int random = new Random().nextInt(10000);
- int position = fileName.lastIndexOf(".");
- String extension = fileName.substring(position);
- return formatDate + random + extension;
- }
- }
寫到這裏,我就有疑問了,之前的大神改的多文件,爲什麼還是取id,而且後臺是怎麼取的,我還是沒怎麼弄明白,我改的這個代碼可行麼?是不是存在bug呢?這個還有待考驗,如果看出問題,請指出,共同學習
最後附上,我修改後的插件
- ajaxfileupload.rar (2.4 KB)