varX = 2;
varY = 3;
var txt = '#div' + varX+ varY;
alert($(txt).innerHtml);
A couple of things are going on here.
1) If you meant '#div' + varX+ varY; to come out to #div5 then you
have to do '#div' + (varX+ varY); because javascript thinks you are
attempting string concatenation on '#div' + varX+ varY; and treats
them all as strings because one of them is a string. if you wanted
#div23 then you are doing the right thing.
2) $(selector) does not return a DOM node or NodeList, it returns a
jQuery collection. If you want access to the nodes inside you can do $
(selector)[0] to access the first node, or $(selector).get(0). and
then get the innerHTML like $(selector)[0].innerHTML. jQuery also
provide a shortcut for getting/setting the html: $(selector).html
('content here');
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