File upload problem in php using ajax

[gurjar_raj]

Dear All,

I am having problem in file uploading in php using ajax.

I am using zend framework i have to upload blob image in mysql. I am using ajax for
without page refreshing form will submit. but when i print $_FILES in controller than array print null value.
If you have any solution so please help me.

Thanks
Rajesh Gurjar

[dagon]

need to see some actual code.

[gurjar_raj]

index.phtml

<form enctype="multipart/form-data" name="bidtask_form" method="POST">
<input type="hidden" name="MAX_FILE_SIZE" value="1000000000" />
Send this file: <input name="thumbnail" type="file" />
<input type="button" value="Send File" onclick="saveRecord();"/>
</form>

bidtask.js

function GetXmlHttpObject()
{
    var xmlHttp=null;
    try{
    // Firefox, Opera 8.0+, Safari
        xmlHttp=new XMLHttpRequest();
    }
    catch (e){
    //Internet Explorer
        try    {
            xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
        }
        catch (e){
            xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
    }
    return xmlHttp;
}

function saveRecord() {
ajaxObj=GetXmlHttpObject();

if (ajaxObj) {
	thumbnail = document.bidtask_form.thumbnail.value;
	var postStr = "thumbnail=" + encodeURIComponent(thumbnail) + "&MAX_FILE_SIZE=" + encodeURIComponent("1000000000");
	var url="save";
	ajaxObj.open("POST",url,true);
	ajaxObj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	ajaxObj.setRequestHeader("Content-length", postStr.length);
	ajaxObj.setRequestHeader("Connection", "close");
	ajaxObj.send(postStr);
	ajaxObj.onreadystatechange = stateChanged;
} else {
	alert("Your browser does not support ajax!");
}
}

function stateChanged(transport)
{
	if (ajaxObj.readyState == 4) {
		var resultStr = ajaxObj.responseText;
		document.getElementById("deleteMsg").innerHTML = resultStr;
		 var t = setTimeout("clearMessage()",3000);
	}
}

bidController.php

public function saveAction()
	{	
		if($_SESSION['status'] == 'login')
    	{
			$this->_helper->viewRenderer->setNoRender();
			$db = CommonServices::getDbFactory();
			print_r($_FILES); // I have problem in this line it is returning null.
			exit;
			$tmpName  = $_FILES['thumbnail'];
			if($tmpName!=''){
				if(filesize($tmpName) <= 3200){
			 		$fp      = fopen($tmpName, 'r+');
					$content = fread($fp, filesize($tmpName)); 
					fclose($fp);
			 	}else{
			 		echo "Maximum file size 25 KB only";
					exit;
				 }
			}else{
				$content = "";
			}

			$data = array(
				'thumbnail' => $content
			);

			$db->insert('shottask',$data);
			echo 'Data inserted successfully';
	}
	else
	{
		$this->_redirect("/");
	}
}

[gurjar_raj]

This is my original code please help me.

I am facing big problem with this.