How to submit form in jquery ui dialog and display its response

Suppose you have the following markup

<div id="__DialogPanel" style="display:none" title=""></div>

With this code you setup the dialog

$("#__DialogPanel").dialog({
    autoOpen: false,
    resizable: false,
    position: 'center',
    stack: true,
    height: 'auto',
    width: 'auto',
    modal: true
});

With this code you show the dialog and include the results of an ajax call

$.ajax({
    type: "get",
    dataType: "html",
    url: 'some/url',
    data: {},
    success: function(response) {
        $("#__DialogPanel").empty().html(response).dialog('open');
    }
});

With this code you submit the form in the dialog and then close it if everything is ok or display again the form if has errors

$.ajax({
    type: 'post',
    dataType: 'html',
    url: '/someother/url',
    async: false,
    data: $("#myform").serialize(),
    success: function (response, status, xml) {
        //Check for error here
        if (error) {
            $("#myform").parent().html('').html(response);
        }
        else {
            $("#__DialogPanel").dialog('close');
        }
    }
});

Hope it helps!

I guess you open your dialog like this:

$.post('xyz.htm', function(data) { $('#mydialog .mytarget').html(data).slideDown(); });

The trick is using the callback function (which gets as parameter the response), and dumping the response into your desired element.