php - related width of tow elements -

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i have problem ,i want relate width of tow elements, first simpl div , second span ... write code:

<div id="wb_name_to_menu" style="position:absolute;left:768px;top:20px;width:171px;height:18px;z-index:4;"> <span id="sp_name_to_menu" style="color:#ff0000;font-family:arial;font-size:16px;">love me!</span></div>     <div id="layer_to_mainu" style="visibility: hidden;position:absolute;text-align:left;left:772px;top:22px;width:132px;height:135px;z-index:132;" title="">     <div id="wb_main_mainu" style="position:absolute;left:8px;top:9px;width:123px;height:28px;z-index:1128;padding:0;">     <div id="main_mainu">     <ul style="display:none;">     <li><span></span><span id="id_full_name_from_main_menu">love&nbsp;meeeeee</span>     <ul>     <li><span></span><span>account&nbsp;sitting</span></li>     <li><span></span><span>help</span></li>     <li><span></span><span>log&nbsp;out</span></li>     </ul>     </li>     </ul>     </div>

in javascript , do:

$(document).ready(function(){   $("#wb_name_to_menu").hover(function(){      $("#layer_to_mainu").css("visibility","visible");       $("#layer_to_mainu").css("width",$("#id_full_name_from_main_menu").width()+"px");   }); });  $(document).ready(function(){   $("#layer_to_mainu").mouseleave(function(){     $("#layer_to_mainu").css("visibility","hidden");   }); });

it doesnt work !! , konw cause : causde $("#id_full_name_from_main_menu").width() gived null value !!! can 1 me please :)

$("#id_full_name_from_main_menu").width() returns 0 because ancestor <ul> has display:none set. read width might want remove attribute, or temporarily change in js, depending on you're trying do

$(document).ready(function(){   $("#wb_name_to_menu").hover(function(){    $("#layer_to_mainu").css("visibility","visible");    $("#main_mainu > ul").css("display","block");   $("#layer_to_mainu").css("width",$("#id_full_name_from_main_menu").width()+"px");   $("#main_mainu > ul").css("display","none"); });

that won't display text update width of #id_full_name_from_main_menu, need remove display:none see text appear.


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