Jquery Mobile: Dynamically change the text of the header of a collapsible div?

Question

<div data-role="collapsible" data-content-theme="e" id="collapsePlace">
    <h3>Place:</h3>
    <!--things...-->
</div>

How can I dynamically change the text of the <h3> header ('Place:') in the collapsible div?

I tried:

$('#collapsePlace').children('h3').text('new text');

And it changes the text - but loses all of the styling!

Answer 1

The actual HTML structure of a collapsible in jQuery Mobile 1.0RC2 is the following (after the framework has made its pass on the HTML):

<div id="collapsePlace" data-content-theme="e" data-role="collapsible" class="ui-collapsible ui-collapsible-collapsed">
    <h3 class="ui-collapsible-heading ui-collapsible-heading-collapsed">
        <a class="ui-collapsible-heading-toggle ui-btn ui-btn-icon-left ui-corner-top ui-corner-bottom ui-btn-up-c" href="#" data-theme="c">
            <span aria-hidden="true" class="ui-btn-inner ui-corner-top ui-corner-bottom">
                <span class="ui-btn-text">Place:
                    <span class="ui-collapsible-heading-status"> click to expand contents</span>
                </span>
                <span class="ui-icon ui-icon-plus ui-icon-shadow"></span>
            </span>
        </a>
    </h3>
    <div class="ui-collapsible-content ui-body-e ui-collapsible-content-collapsed" aria-hidden="true">
        <!--things...-->
    </div>
</div>

The nested <span> element within the <span class="ui-btn-text"> element makes this a little tricky. If you want to preserve the structure of the <span class="ui-btn-text"> element you will need to save the nested <span> element, overwrite it, and then replace it:

//run code on document.ready
$(function () {
    var num = 1;
    //add click handler to link to increment the collapsible's header each click
    $('a').bind('click', function () {
        //cache the `<span class="ui-btn-text">` element and its child
        var $btn_text  = $('#collapsePlace').find('.ui-btn-text'),
            $btn_child = $btn_text.find('.ui-collapsible-heading-status');
        //overwrite the header text, then append its child to restore the previous structure
        $btn_text.text('New String (' + num++ + ')').append($btn_child);
    });
});

Here is a jsfiddle of the above solution: http://jsfiddle.net/jasper/4DAfn/2/