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How to solve "it is impossible to call a method ... until undefined" in closing Google (creating a simple toolbar)?

below is the complete HTML source for creating a simple toolbar with google closing.

Gives an error message in Chrome: Uncaught TypeError: Cannot call method 'addChild' of undefinedin the place marked by the comment // ERROR.

Can anyone suggest a tip fixing this? Thank!!!

edit: right, I missed the new one , but another mistake was that I had to use render()instead decorate(), because it decorate()requires that all dom elements are in place (and I don’t have placeholders for certain buttons), but it render()creates new ones.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html lang="en-US" xml:lang="en-US" xmlns="http://www.w3.org/1999/xhtml"> 
<head> 


<script type="text/javascript" src="/m/google-closure/closure/goog/base.js"></script> 
<script type="text/javascript"> 
    goog.require('goog.dom');
    goog.require('goog.ui.Toolbar');
    goog.require('goog.ui.ToolbarButton');
</script> 
<script type="text/javascript"> 
    var load_sketcher = function(){
        var tb = goog.ui.Toolbar();
        tb.addChild(new goog.ui.ToolbarButton('A'), true);// ERROR!!!
        tb.addChild(new goog.ui.ToolbarButton('B'), true);
        tb.decorate(goog.dom.getElement('sk_toolbar'));// should have used render() here
    };
</script> 

</head> 
<body onload='load_sketcher();'> 

<div id="sketcher"> 
    <div id="sk_toolbar"></div> 
    <div id="sk_canvas"></div> 
</div> 

</body> 
</html>
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, , , :

 var tb = new goog.ui.Toolbar();
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Source: https://habr.com/ru/post/1733776/

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