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 = 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 = document.createElement("a");
newA.className = "delete";
newA.title = "删除";
newA.href = " ";
newA.onclick = function(){delDiv(newDiv);};
var newInput_s = document.createElement("input");
newInput_s.type = "hidden";
newInput_s.value = src_s;
newInput_s.name = "image_s[]";
newA.appendChild(newInput_s);
var newInput_b = document.createElement("input");
newInput_b.type = "hidden";
newInput_b.value = src_b;
newInput_b.name = "image_b[]";
newA.appendChild(newInput_b);
var newImgDiv = document.createElement("div");
var newImg = 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_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";}
可能是由于使用iframe的关系
delDiv函数里的swfu不能用this代替
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}
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
swfupload_loaded_handler : loaded,//再在handlers.js定义loaded函数[javascript]view plaincopyfunction 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);}
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