我做了一个ajax文件上传，但上传后表格显示两次

I doing an ajax file uploadusing jquery.form.js.

After uploading I send back the uploaded files' id from PHP to tpl(Smarty).

Problem is that now I'm getting the tpl twice. When I put an exit command in the php file I can solve this problem, but then I will not get the value of the returned file's id to tpl.

Now I would like to get the returned file key in tpl, and also want to display the tpl only once.

if(isset($input['act']) and trim($input['act']) == "uplaodFile") {

    $valid_formats = array("jpg", "png", "gif", "bmp");
    $name = $_FILES['photoimg']['name'];
    $size = $_FILES['photoimg']['size'];
    if(strlen($name))
    {
        list($txt, $ext) = explode(".", $name);
        if(in_array($ext,$valid_formats))
        {
          if($size<(1024*1024))
          {
            $actual_image_name = time().substr(str_replace(" ", "_", $txt), 5).".".$ext;
            $tmp = $_FILES['photoimg']['tmp_name'];

            if($filekey = $files->uploadFile($contact_id, $wrkspace_id, $_FILES['photoimg'], "files", null))
            {
             $smarty->assign("filekey",$filekey);
            } 
           }
           else
              Error::setError ("Image file size max 1 MB"); 
        }
        else
          Error::setError("Invalid file format..");
       }
       else
        Error::setError("Please select image..!");
        //EXIT;
     }
display("schedule_event");