使用swfupload仿赶集的图片上传
SWFUpload是一个基于flash与javascript的客户端文件上传组件。
handlers.js文件
完成文件入列队(fileQueued) →
完成选择文件(fileDialogComplete) → 开始上传文件(uploadStart) → 上传处理(uploadProgress) → 上传成功(uploadSuccess) → 上传完成(uploadComplete) →
列队完成(queueComplete)
如上所示,单选文件顺序执行以上回调函数,需要注意的是选择多个文件,fileQueued、queueComplete只会执行一次,而fileDialogComplet...→ uploadComplete每个文件都执行一次。
参考官方例子完成基本功能后,仿赶集采用iframe的方式
为了实现缩略图预览 以及删除 和上传图片个数的限制
显示缩略图,生成删除缩略图的按钮,
thumbImages为父页面显示缩略图的div
src_s为生成的缩略图地址
src_b为原图地址
serverData是图片上传处理页面返回的数据 成功则以 success|缩略图地址|原图地址 这样的格式返回
[javascript] view plaincopy
- function uploadSuccess(file, serverData) {
- try {
- var result = serverData.split(‘|‘);
- if(result[0] != ‘success‘) {
- var progress = new FileProgress(file, this.customSettings.progressTarget);
- progress.setError();
- progress.setStatus(serverData);
- progress.toggleCancel(false);
- } else {
- var progress = new FileProgress(file, this.customSettings.progressTarget);
- progress.setComplete();
- progress.setStatus("上传完成");
- progress.toggleCancel(false);
- var img_url_s = result[1];
- var img_url_b = result[2];
- addImage(img_url_s,img_url_b);
- }
- } catch (ex) {
- this.debug(ex);
- }
- }
[javascript] view plaincopy
- function addImage(src_s,src_b) {
- var newDiv = parent.document.createElement("div");
- newDiv.style.margin = "5px";
- newDiv.style.height = "60px";
- newDiv.style.width = "80px";
- newDiv.style.border = "1px solid #7F9DB9";
- newDiv.style.cssFloat = "left";
- newDiv.style.styleFloat = "left";
- newDiv.style.position = "relative";
- var newA = parent.document.createElement("a");
- newA.className = "delete";
- newA.title = "删除";
- newA.href = "javascript::";
- newA.onclick = function(){delDiv(newDiv);};
- var newInput_s = parent.document.createElement("input");
- newInput_s.type = "hidden";
- newInput_s.value = src_s;
- newInput_s.name = "image_s[]";
- newA.appendChild(newInput_s);
- var newInput_b = parent.document.createElement("input");
- newInput_b.type = "hidden";
- newInput_b.value = src_b;
- newInput_b.name = "image_b[]";
- newA.appendChild(newInput_b);
- var newImgDiv = parent.document.createElement("div");
- var newImg = parent.document.createElement("img");
- newImg.style.height = "60px";
- newImg.style.width = "80px";
- newImgDiv.appendChild(newImg);
- newDiv.appendChild(newImgDiv);
- newDiv.appendChild(newA);
- parent.document.getElementById("thumbImages").appendChild(newDiv);
- if (newImg.filters) {
- try {
- newImg.filters.item("DXImageTransform.Microsoft.Alpha").opacity = 0;
- } catch (e) {
- // If it is not set initially, the browser will throw an error. This will set it if it is not set yet.
- newImg.style.filter = ‘progid:DXImageTransform.Microsoft.Alpha(opacity=‘ + 0 + ‘)‘;
- }
- } else {
- newImg.style.opacity = 0;
- }
- newImg.onload = function () {
- fadeIn(newImg, 0);
- };
- newImg.src = src_s;
- }
- function fadeIn(element, opacity) {
- var reduceOpacityBy = 5;
- var rate = 30; // 15 fps
- if (opacity < 100) {
- opacity += reduceOpacityBy;
- if (opacity > 100) {
- opacity = 100;
- }
- if (element.filters) {
- try {
- element.filters.item("DXImageTransform.Microsoft.Alpha").opacity = opacity;
- } catch (e) {
- // If it is not set initially, the browser will throw an error. This will set it if it is not set yet.
- element.style.filter = ‘progid:DXImageTransform.Microsoft.Alpha(opacity=‘ + opacity + ‘)‘;
- }
- } else {
- element.style.opacity = opacity / 100;
- }
- }
- if (opacity < 100) {
- setTimeout(function () {
- fadeIn(element, opacity);
- }, rate);
- }
- }
关于剩余可上传文件个数的处理
[javascript] view plaincopy
- function queueComplete(numFilesUploaded) {
- this.setButtonDisabled(false);
- var stats = this.getStats();
- var status = document.getElementById("divStatus");
- status.innerHTML = "已上传 " + stats.successful_uploads + " 个文件,还可以上传"+ parseInt(this.settings[‘file_upload_limit‘]-stats.successful_uploads) +"个文件";
- }
- function delDiv(mydiv) {
- mydiv.parentNode.removeChild(mydiv);
- //swfu参见iframe页面中的 swfu = new SWFUpload(settings);
- var stats = swfu.getStats();
- stats.successful_uploads--;
- swfu.setStats(stats);
- var status = document.getElementById("divStatus");
- status.innerHTML = "已上传 " + stats.successful_uploads + " 个文件,还可以上传"+ parseInt(swfu.settings[‘file_upload_limit‘]-stats.successful_uploads) +"个文件";
- }
可能是由于使用iframe的关系
delDiv函数里的swfu不能用this代替
整体效果如下图:
当上传完图片后,再次修改信息时,需要取已经上传了多少个图片,结合到swfupload里
通过php从后台取到已上传的图片路径,通过smarty给到一个js数组里
[javascript] view plaincopy
- var img_arr = new Array();
- {if isset($img_arr)}
- {section name=‘img_arr‘ loop=$img_arr}
- img_arr[{$smarty.section.img_arr.index}] = new Array(‘{$img_arr[img_arr].images_s}‘,‘{$img_arr[img_arr].images_b}‘);
- {/section}
- {/if}
查询swfupload文档得到如下资料
flashReady()
该事件函数是内部事件,因此不能被重写。当SWFupload实例化,加载的FLASH完成所有初始化操作时触发此事件。
提醒:对应设置中的自定义事件swfupload_loaded_handler
于是通过swfupload的settings里设置 swfupload_loaded_handler
[javascript] view plaincopy
- swfupload_loaded_handler : loaded,
再在handlers.js定义loaded函数
[javascript] view plaincopy
- function loaded() {
- if(img_arr.length != 0) {
- for( val in img_arr ) {
- addImageFromDb(img_arr[val][0],img_arr[val][1],this);
- }
- }
- }
调用addImageFromDb函数 修改已上传的图片数量 并且生成已上传的图片的缩略图
[javascript] view plaincopy
- //初始化已经上传过的图片
- function addImageFromDb(src_s,src_b,swfu) {
- var stats = swfu.getStats();
- stats.successful_uploads++;
- swfu.setStats(stats);
- var status = document.getElementById("divStatus");
- status.innerHTML = "已上传<font color=‘green‘>" + stats.successful_uploads + "</font>张,还可以上传<font color=‘red‘>"+ parseInt(swfu.settings[‘file_upload_limit‘]-stats.successful_uploads) +"</font>张";
- addImage(src_s,src_b);
- }
参考博客:http://blog.csdn.net/keyunq/article/details/7191590
参考文档:http://leeon.me/upload/other/swfupload.html
http://hi.baidu.com/e_polo/blog/item/232745182e3dbbb84aedbcf7.html
http://addcn.blogbus.com/logs/157496180.html
SWFUpload多文件上传 文件个数限制 setStats()