SWFUpload多文件上传及文件个数限制的方法

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);
  }
}

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";
}

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}

function loaded() {
  if(img_arr.length != 0) {
    for( val in img_arr ) {
      addImageFromDb(img_arr[val][0],img_arr[val][1],this);
    }
  }
}

//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" + stats.successful_uploads + "张,还可以上传"+ parseInt(swfu.settings['file_upload_limit']-stats.successful_uploads) +"张";
  addImage(src_s,src_b);
}