Returning value from confirmation dialog using JQuery UI dialog

I am using jQuery UI dialog to display a confirmation dialog when a button is clicked. I want to return true, when OK is clicked and false otherwise.

Associating dialog open call in onClick (as given here, $dialog.dialog('open');) event does not serve the purpose. So, as a workaround, I followed an approach, which is similar to this: http://www.perfectline.co.uk/blog/unobtrusive-custom-confirmation-dialogs-with-jquery. There are two differences between this approach and mine:

  1. The example uses anchor tag and,
  2. It does not use jQuery UI dialog.

I have modified the code given in the example link, but it does not work. I wonder what I am doing wrong. Is there any cheaper way to do this?

Here is the code, all the CSS/JS are referencing to jQuery CDN, so you should be able to copy the code to see the behavior.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

  <head>
    <link type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/themes/blitzer/jquery-ui.css" rel="stylesheet" />
    <script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.4/jquery-ui.min.js"></script>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Control Panel</title>
  </head>

  <body>
    <form action="http://google.com">
      <button class="es-button ui-state-default ui-corner-all" name="changeSem" id="id2">Start Thermonuclear War</span>
      </button>
    </form>
    <div title="Why so serious?" id="id3" style="display:none;">
      <p>You are about to start a war.
        <p>Click OK to confirm. Click Cancel to cancel this action.</p>
    </div>
  </body>
  <script type="text/javascript">
    $('#id2').click(function (event) {

      if ($(this).data('propagationStopped')) {
        //alert('true');
        $(this).data('propagationStopped', false);
        return true;
      } else {

        event.stopImmediatePropagation();

        $('#id3').dialog({
          //autoOpen: false,
          width: 600,
          buttons: {
            "Ok": function () {
              $(this).dialog("close");
              $('#id2').data('propagationStopped', true);
              $('#id2').triggerHandler(event);
            },
            "Cancel": function () {
              $(this).dialog("close");
              return false;
            }
          }
        });
        //alert('false');
        return false;
      }
    });
  </script>

</html>

Clarification: Please note that it's very simple (see the solution by bryan.taylor) to do a form submission. What I want to do here is to simulate submission by button click. More like JavaScript's confirm() method.

Answers:

Answer

JavaScript is asynchronous. The call to

$myDialog.dialog('open'); 

will not block, but rather will return immediately.

Instead, one must use event callbacks that you provide in the buttons option of dialog.

This near-duplicate provides a good example:

jquery ui dialog box need to return value, when user presses button, but not working

Answer

Your code is a bit convoluted, I think there is a much easier way to do this. You should instantiate the dialog first, then open it on the click event for your button. Code would look similar to this:

<script>
$(document).ready(function () {
  var $myDialog = $('<div></div>')
    .html('You are about to start a war.<br/>Click OK to confirm.  Click Cancel to stop this action.')
    .dialog({
    autoOpen: false,
    title: 'Why so serious?',
    buttons: {
      "OK": function () {
        $(this).dialog("close");
        window.open('http://google.com/');
        return true;
      },
      "Cancel": function () {
        $(this).dialog("close");
        return false;
      }
    }
  });

  $('#myOpener').click(function () {
    return $myDialog.dialog('open'); //replace the div id with the id of the button/form
  });
});
</script>

<div id="myOpener"></div>

Here is the jQuery UI Dialog API documentation, so you can see all your options:

http://api.jqueryui.com/dialog/

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