jQuery和Ajax中的错误

Question

I write the code for uploading image in local machine in ajax and jquery. And if condition is not executed.

Here is the fnUploadImage script.

function fnUploadPhoto()
{
var image = $("#txtUploadImage").val();

var objUploadImage = new Object();
objUploadImage.ImageName = image;
objUploadImage.UserID = <?php echo $_SESSION['UserId']; ?>

$.ajax({
    type:"POST",
    url:"db.php?UploadImage",
    data: {data:objUploadImage},
    dataType:"json",
    async:false,
    success: function(response)
    {
        alert(response.ErrorMessage);
        if(response.IsError)
            $("#errorUploadPhoto")[0].innerHTML = response.ErrorMessage;
        else
            $("#errorUploadPhoto")[0].innerHTML = response.SuccessMessage;
    },
    error:function(response)
    {
        alert("Error: " + response.ErrorMessage);
    }
});
}

And this function calls the db.php UploadImage function which is as follows:

function UploadImage($data)
{
$allowedExts = array("gif", "jpeg", "jpg", "png");
$temp = explode(".", $_FILES["file"]["txtUploadImage"]);
$extension = end($temp);
if ((($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
|| ($_FILES["file"]["type"] == "image/jpg")
|| ($_FILES["file"]["type"] == "image/pjpeg")
|| ($_FILES["file"]["type"] == "image/x-png")
|| ($_FILES["file"]["type"] == "image/png"))
&& in_array($extension, $allowedExts))
    {
        if ($_FILES["file"]["error"] > 0)
        {
            die(json_encode(array("IsError" => true, "ErrorMessage" => "Error")));
            //echo "Return Code: " . $_FILES["file"]["error"] . "<br>";
            json_encode(array("IsError" => true, "ErrorMessage" => "Return Code: " . $_FILES["file"]["error"]));
        }
        else
        {
            if (file_exists("profile_images/" . $_FILES["file"]["txtUploadImage"]))
            {
                //echo $_FILES["file"]["name"] . " already exists. ";
                json_encode(array("IsError" => true, "ErrorMessage" => "Filename already exists."));
            }
            else
            {
                if($_FILES["file"]["size"]/1024 < 20)
                {
                    move_uploaded_file($_FILES["file"]["tmp_name"], "profile_images/" . $_FILES["file"]["txtUploadImage"]);
                    //echo "Stored in: " . "profile_images/" . $_FILES["file"]["name"];
                    json_encode(array("IsError" => false, "SuccessMessage" => "Image uploaded successfully."));
                }
                else
                {
                    json_encode(array("IsError" => true, "ErrorMessage" => "Minimum image size is 20 kb."));
                }
            }
        }
    }
else
{
    //echo "Invalid file.";
    json_encode(array("IsError" => true, "ErrorMessage" => "Invalid file."));
}
}

When i run this script it shows in me the Error called undefined. Please help me to solve this.

Answer 1

quotes are metter here. If you dont use codes it understands it is a variable which is undefined