关于swfupload的handle.js

[wrost]

问题： file.id = "singlefile"; // This makes it so FileProgress only makes a single UI element, instead of one for each file
好像这样设置后，每次只能上传一个文件。 原理是什么？

//当文件上传完毕并且服务器返回200状态时，uploadSuccess事件将触发。
function uploadSuccess(file, serverData) {
    try {
        file.id = "singlefile"; // This makes it so FileProgress only makes a single UI element, instead of one for each file
        var progress = new FileProgress(file, this.customSettings.progress_target);    //？？没看到定义啊this.customSettings.progress_target
        progress.setComplete();
        progress.setStatus("正在转换视频，请稍候...");
        progress.toggleCancel(false);

        if (serverData === " ") { this.customSettings.upload_successful = false; } 
        else {this.customSettings.upload_successful = true;
        //alert(serverData);
            var txtVname = document.getElementById("vname");
            if (txtVname != null)
                txtVname.value = serverData;
            else
                progress.setStatus("视频上传并转换成功");
        }
    } catch (e) { this.debug(e); }
}



function uploadComplete(file) {
    try {
        if (this.customSettings.upload_successful) {
            this.setButtonDisabled(true);
            if(typeof(submitRequired)!="undefined"&&submitRequired)
            uploadDone();
        } else {
            file.id = "singlefile"; // This makes it so FileProgress only makes a single UI element, instead of one for each file
            var progress = new FileProgress(file, this.customSettings.progress_target);
            progress.setError();
            progress.setStatus("文件被拒收");
            progress.toggleCancel(false);
            var txtFileName = document.getElementById("videoPath");
            txtFileName.value = "";
            validateForm();
            alert("上传文件出错，服务器拒绝接收文件");
        }
    } catch (e) {this.debug(e); }
}


//根据error code参数的值你可以得出SWFUpload.UPLOAD_ERROR中的一个常量（译者注：表示具体错误）
function uploadError(file, errorCode, message) {
    try {

        if (errorCode === SWFUpload.UPLOAD_ERROR.FILE_CANCELLED) {
            // Don't show cancelled error boxes                                 //如果是用户取消上传，不显示错误信息
            return;
        }

        var txtFileName = document.getElementById("videoPath");                 
        txtFileName.value = "";                                                 //将文本框内的文件名清空
        validateForm();                                                         //验证表单
        // Handle this error separately because we don't want to create a FileProgress element for it.
        switch (errorCode) {
            case SWFUpload.UPLOAD_ERROR.MISSING_UPLOAD_URL:
                alert("配置出错：上传路径丢失");                                //估计是upload_url:没有设置
                this.debug("Error Code: No backend file, File name: " + file.name + ", Message: " + message);
                return;
            case SWFUpload.UPLOAD_ERROR.UPLOAD_LIMIT_EXCEEDED:                  //file_upload_limit:超过这个设置
                alert("您只可以上传一个文件");
                this.debug("Error Code: Upload Limit Exceeded, File name: " + file.name + ", File size: " + file.size + ", Message: " + message);
                return;
            case SWFUpload.UPLOAD_ERROR.FILE_CANCELLED:                         //取消上传
            case SWFUpload.UPLOAD_ERROR.UPLOAD_STOPPED:                         //停止上传
                break;
            default:
                alert("上传出错，请稍后重试");                                  //
                this.debug("Error Code: " + errorCode + ", File name: " + file.name + ", File size: " + file.size + ", Message: " + message);
                return;
        }

        file.id = "singlefile"; // This makes it so FileProgress only makes a single UI element, instead of one for each file
        var progress = new FileProgress(file, this.customSettings.progress_target);      //？？progress_target  没有设置啊
        progress.setError();
        progress.toggleCancel(false);

        switch (errorCode) {
            case SWFUpload.UPLOAD_ERROR.HTTP_ERROR:
                progress.setStatus("上传出错");
                this.debug("Http错误，文件名：" + file.name + ", 错误消息： " + message);
                break;
            case SWFUpload.UPLOAD_ERROR.UPLOAD_FAILED:
                progress.setStatus("上传失败");
                this.debug("上传失败，文件名： " + file.name + ", 文件大小: " + file.size + ", 错误消息: " + message);
                break;
            case SWFUpload.UPLOAD_ERROR.IO_ERROR:
                progress.setStatus("服务器（IO）错误");
                this.debug("IO错误, 文件名: " + file.name + ", 错误消息: " + message);
                break;
            case SWFUpload.UPLOAD_ERROR.SECURITY_ERROR:
                progress.setStatus("安全性错误");
                this.debug("安全性错误, 文件名: " + file.name + ", 错误消息: " + message);
                break;
            case SWFUpload.UPLOAD_ERROR.FILE_CANCELLED:
                progress.setStatus("上传被取消");
                this.debug("上传被取消, 文件名: " + file.name + ", 错误消息: " + message);
                break;
            case SWFUpload.UPLOAD_ERROR.UPLOAD_STOPPED:
                progress.setStatus("上传停止");
                this.debug("上传停止, 文件名: " + file.name + ", 错误消息: " + message);
                break;
        }
    } catch (ex) {
    }
}