jquery form plugin, no error handling

Question

Hi,

It seems that there are no error handling facility in the Jquery.Form plugin, which is very frustrating. Even though the documentation says we can use the $.ajax options, I still cannot make use of the 'error' option when the server returns an error, especially the 500 and 400 series. Is it that this plugin cannot handle any error at all from the server or is it a bug, etc? Can someone please tell me how I can handle errors (400, 500, etc) with this plugin? I need your help... All I want is a simple error handling... Thank you.

$("#uploadingImg").hide();

var options = {//Define ajax options
    type: "post",
    target: "#responsePanel",
    beforeSend: function(){
        $("#uploadingImg").show();
    },
    complete: function(xhr, textStatus){
        $("#uploadingImg").hide();
    },
    success: function(response, statusString, xhr, $form){
        // I know what to do here since this option works fine
    },
    error: function(response, status, err){
        // This option doesn't catch any of the error below, 
        // everything is always 'OK' a.k.a 200
        if(response.status == 400){
            console.log("Sorry, this is bad request!");
        }
        if(response.status == 601){
            sessionTimedOut();
        }
    }
}
$("#polygonUploadForm").submit(function(){
    $(this).ajaxSubmit(options); // Using the jquery.form plugin
    return false;
});

Answer 1

The form plugin doesn't manipulate the response code in any way, if you're seeing a status code of 200 then your server is returning a status code of 200, which means there was no HTTP error.

You can either:

• Make your server return something other than a 200
• Or, do the check in your success handler for whatever error comes back, searching for an #error, etc.

Though, apart from the response code do note that the form plugin will call your error handler when any other error occurs that it can't handle, even if it's handling the response after it comes back.

Answer 2

Just found out that the jquery.form plugin itself doesn't handle server error, because it doesn't have access to response headers due to the way 'file input' tag handles file upload. So I think the W3C needs to review that troublesome tag that not only doesn't let you style it with CSS but also doesn't make server response handling easy.

There must be a way around it though...

Let me know if I said something wrong and let me know your thoughts about this 'file input' tag...