jQuery UI Dialog - missing close icon

Question

I am late to this one by a while, but I'm going to blow your mind, ready?

The reason this is happening, is because you are calling bootstrap in, after you are calling jquery-ui in.

Literally, swap the two so that instead of:

<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<script src="js/bootstrap.min.js"></script>

it becomes

<script src="js/bootstrap.min.js"></script>
<script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>

:)

Edit - 26/06/2015 - this keeps attracting interest months later so I thought it was worth an edit. I actually really like the noConflict solution offered in the comment underneath this answer and clarified by user Pretty Cool as a separate answer. As some have reported issues with the bootstrap tooltip when the scripts are swapped. I didn't experience that issue however because I downloaded jquery UI without the tooltip as I didn't need it because bootstrap. So this issue never came up for me.

Edit - 22/07/2015 - Don't confuse jquery-ui with jquery! While Bootstrap's JavaScript requires jQuery to be loaded before, it doesn't rely on jQuery-UI. So jquery-ui.js can be loaded after bootstrap.min.js, while jquery.js always needs to be loaded before Bootstrap.

This is a comment on the top answer, but I felt it was worth its own answer because it helped me answer the problem.

If you want to keep Bootstrap declared after JQuery UI (I did because I wanted to use the Bootstrap tooltip), declaring the following (I declared it after $(document).ready) will allow the button to appear again (answer from https://stackoverflow.com/a/23428433/4660870)

var bootstrapButton = $.fn.button.noConflict() // return $.fn.button to previously assigned value
$.fn.bootstrapBtn = bootstrapButton            // give $().bootstrapBtn the Bootstrap functionality

This appears to be a bug in the way jQuery ships. You can fix it manually with some dom manipulation on the Dialog Open event:

$("#selector").dialog({
    open: function() {
        $(this).closest(".ui-dialog")
        .find(".ui-dialog-titlebar-close")
        .removeClass("ui-dialog-titlebar-close")
        .html("<span class='ui-button-icon-primary ui-icon ui-icon-closethick'></span>");
    }
});

I found three fixes:

1. You can just load bootsrap first. And them load jquery-ui. But it is not good idea. Because you will see errors in console.

2. This:

   var bootstrapButton = $.fn.button.noConflict();
   $.fn.bootstrapBtn = bootstrapButton;
   

   helps. But other buttons look terrible. And now we don't have bootstrap buttons.

3. I just want to use bootsrap styles and also I want to have close button with an icon. I've done following:

   How close button looks after fix

   .ui-dialog-titlebar-close {
       padding:0 !important;
   }
   
   .ui-dialog-titlebar-close:after {
       content: '';
       width: 20px;
       height: 20px;
       display: inline-block;
       /* Change path to image*/
       background-image: url(themes/base/images/ui-icons_777777_256x240.png);
       background-position: -96px -128px;
       background-repeat: no-repeat;
   }