You have $('#sizer').
but no object with the id of "size" in your markup.... where is the slider at? On Jan 21, 4:20 pm, Mircea <i...@amsterdamsat.com> wrote: > Hi, > I want to make the UI slider to set a font-size to a .cica class. The > setfontsize variable works but I can not succeed to make the slider > change the value on slide. > > Here is the function > > $('#sizer').slider({ > slide: function(event, ui) { > var setfontsize = $('#sizer:selected').text(); > $('.cica').css("font-size", setfontsize + "px"); > } > > Here is the markup > > <form action="#"> > <!-- Slider --> > <fieldset> > <select name="speed" id="speed"> > <option value="10">10</option> > <option value="15">15</option> > <option value="21" > selected="selected">21</option> > <option value="30">30</option> > <option value="40">40</option> > </select> > </fieldset> > </form> > > Thank you.