Question

I have tried to follow the specs on jquery documentation but i cannot initialize the label of the button programmatically and add/remove classes to it.

Please have a look at the few lines in this jsbin.

http://jsbin.com/akinod/2/edit

HTML

<label for="xAxisToggleBtn"></label>
<input type="checkbox" id="xAxisToggleBtn"/>

CSS

.on {
    background-color: green;
    color: white;   
}

.off {
    background-color:brown;
    color: white;   
}

Javascript

    $(window).load(function() {

      $("#xAxisToggleBtn").button();


      $('#xAxisToggleBtn').die('click').live('click', function(){

                if($(this).is(':checked')){
                    $(this).button('option', 'label', 'Turn Off');

                  //why I cannot add/remove classes to change the theme?
                    $(this).addClass('on');
                    $(this).removeClass('off');

                } else {
                    $(this).button('option', 'label', 'Turn On');

                   //why I cannot initialize add/remove classes to change the theme?
                    $(this).addClass('off');
                    $(this).removeClass('on');

                }
        });

});


//why I cannot initialize the label here?
$("#xAxisToggleBtn").button('option', 'label', 'Turn Off');
$("#xAxisToggleBtn").attr('checked', true);
$("#xAxisToggleBtn").addClass('on');

Answer 1

You have to add the class to the button widget, your styles will need to overwrite jQuery-UI own, and make sure the elements are loaded before you try to manipulate them.

$(function() {
    $("#xAxisToggleBtn").attr('checked', true)
      .addClass('on').button({'label': 'Turn Off'})
      .button('widget')
      .addClass('off');        

      $('#xAxisToggleBtn').on('click', function(){                
                if($(this).is(':checked')){
                    $(this).button('option', 'label', 'Turn Off');
                } else {
                    $(this).button('option', 'label', 'Turn On');
                }
                $(this).button('widget').toggleClass('on off');
        });

});

.on {
    background: green!important;
    color: white!important;    
}

.off {
    background:brown !important;
    color: white !important;    
}

DEMO