javascript - Add a span in a span with JQuery -

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i'm trying put <span> in other <span> in title of jquery's modal doesn't work.

here's html code :

<div class="ui-dialog-titlebar...">   <span class="ui-dialog-title">info title</span>   ... </div> <div id="1">

and want put <span class="glyphicon glyphicon-info-sign"></span> inside ui-dialog-title <span>.

i tried : 

$(".ui-dialog-title").prepend('<span class="glyphicon glyphicon-info-sign"></span>');

and works !

<div class="ui-dialog-titlebar...">   <span class="ui-dialog-title">     <span class="glyphicon glyphicon-info-sign"></span>info title   </span>   ... </div> <div id="1">

but, have multiple <span> class ui-dialog-title in document , want access <span> using id of next <div>.

i tried :

$("#"+myid).prev("div").first("span").prepend('<span class="glyphicon glyphicon-info-sign"></span>');

but glyphicon <span> placed before ui-dialog-title <span> :

<div class="ui-dialog-titlebar...">   <span class="glyphicon glyphicon-info-sign"></span>   <span class="ui-dialog-title">info title</span>   ... </div> <div id="1">

i don't understand why placed here because other method, works.

i hope understand problem , thank !

you can do: 

$("#"+myid).prev("div").find(".ui-dialog-title").prepend('<span class="glyphicon glyphicon-info-sign"></span>');

working example

structure:

<div class="ui-dialog-titlebar">   <span class="ui-dialog-title"><span class="glyphicon glyphicon-info-sign"></span>info title</span>  </div>

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