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Filename : fileupload_page.php
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<?php
error_reporting(E_ERROR);
$fileTypesImages  = "jpg,bmp,gif,png,jpeg"; // images
$fileTypesDocuments  = "csv,doc,xls,docx,xlsx,txt,ppt,pptx,rtf,pdf,xml"; // documents
if($_REQUEST['file_type']=="image"){
	$fileTypes = $fileTypesImages;
}else if($_REQUEST['file_type']=="doc"){
	$fileTypes = $fileTypesDocuments;
}else if($_REQUEST['file_type']=="all"){
	$fileTypes = $fileTypesDocuments.",".$fileTypesImages;
}else{

	$clist = explode(",", $_REQUEST['file_type']);
	$supportedList = explode(",", $fileTypesDocuments.",".$fileTypesImages);

	if(count(array_intersect($clist, $supportedList)) == count($clist)){
		$fileTypes = $_REQUEST['file_type'];
	}else{
		$fileTypes = $fileTypesDocuments.",".$fileTypesImages;
	}
}
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<script type="text/javascript" src="<?=BASE_URL?>js/jquery.js"></script>
<script type="text/javascript" src="<?=BASE_URL?>js/jquery.form.js"></script>
<script type="text/javascript" src="<?=BASE_URL?>js/date.js"></script>
<script type="text/javascript" src="<?=BASE_URL?>js/json2.js"></script>

</head>
<body>
<script>
function uploadfile(){
	var form = document.getElementById('upload_data');
	form.submit();
}

function checkFileType (elementName, fileTypes) {
	var fileElement = document.getElementById(elementName);
	var fileExtension = "";
	if (fileElement.value.lastIndexOf(".") > 0) {
		fileExtension = fileElement.value.substring(fileElement.value.lastIndexOf(".") + 1, fileElement.value.length);
	}

	fileExtension = fileExtension.toLowerCase();

	var allowed = fileTypes.split(",");

	if (allowed.indexOf(fileExtension) < 0) {
		fileElement.value = "";
		alert('Selected file type is not supported');
		clearFileElement(elementName);
		return false;
	}

	return true;

}

function clearFileElement (elementName) {

	var control = $("#"+elementName);
	control.replaceWith( control = control.val('').clone( true ) );
}
</script>
	<div id="upload_form">
	<form id="upload_data" method="post" action="<?=CLIENT_BASE_URL?>fileupload.php" enctype="multipart/form-data">
	<input id="file_name" name="file_name" type="hidden" value="<?=$_REQUEST['id']?>"/>
	<input id="file_group" name="file_group" type="hidden" value="<?=$_REQUEST['file_group']?>"/>
	<input id="user" name="user" type="hidden" value="<?=$_REQUEST['user']?>"/>
	<label id="upload_status"><?=$_REQUEST['msg']?></label><input id="file" name="file"  type="file" onChange="if(checkFileType('file','<?=$fileTypes?>')){uploadfile();}"></input>
	</form>
	</div>
	<div id="upload_result" style="display:none;text-align: center;">
		<p id="upload_result_header"></p>
		<p id="upload_result_body"></p>
	</div>
<script type="text/javascript">document.body.style.overflow = 'hidden';</script>
</body>
</html>