php - Cascading Select Boxes - Jquery -


having problem dynamically populated select boxes using jquery.

basically, code calls php script populates select box (utilitymainchart). let's brings 2 options the select box utilitymainchart, want next select box (parametermainchart) populated options whichever option first in utilitymainchart select box.

as right now, select boxes populate initially, line var building = $('#utilitymainchart').val(); never returns value of select box. means change select box result in ones below becoming blank, since no value picked up.

my code javascript shown below:

var data = "1" + "_" + building + "_"; var url = "/charts/data/utilitymanagermenupopulate.php?data=" + data; $('#utilitymainchart').load(url);  var building = $('#utilitymainchart').val(); var data = "2" + "_" + building + "_" + utility; var url = "/charts/data/utilitymanagermenupopulate.php?data=" + data; $('#parametermainchart').load(url);

my php code returns data in form:

<select id="utilitymainchart" name="utilitymainchart">     <option selected value=1>electricity</option>     <option value=3>water</option> </select>

any advice awesome. i've been playing around hours , can't work

try changing 

var building = $('#utilitymainchart').val();

to

var building = $('#utilitymainchart :selected').val();

edit: #utilitymainchart not unique id on both select , selects containing div. when run above code gets div. if try help.

var building = $('select#utilitymainchart').val();

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