javascript - Problems with Extjs.getBody -

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i have line of code 

 var width_client = ext.getbody().getwidth(true);

and ext.getbody() null. asume check doen before ext.getbody() becames not null, dont' know or change.

any idea how solve this?

i use extjs 4.0.7

you can access document.body when rendered. question made conclusion code located inside <head>. when code executed there no <body> rendered yet. have wrap code function , pass function ext.onready (or ext.ondocumentready) method:

ext.onready(function() {     alert(ext.getbody().getwidth(true)); });

here demo.


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