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
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); } }
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
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"; }
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
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}
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
swfupload_loaded_handler : loaded,
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
//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