Topic: My global variable - why is it undefined? (Page 1 of 1)

I code my global variables first,
then my window.onload function, like this:

var globvar = {
  oneTimeSwitch: "0",	
  kbinput: document.createElement("INPUT"),
  kbdivision: document.createElement("DIV"),
etc.
}

window.onload = function() {
  if (kbinput==undefined) alert("NO KBINPUT");
  setTriggers();
}

Why do I get the error:
"KBINPUT IS NOT DEFINED"?
and
Why doesn't the IF statement for UNDEFINED element
catch the problem?

kbinput is only defined in globvar. kbinput itself does not exit. It is undefined. But globvar.kbinput exists.

As poi said, kbinput is undefined because you never defined it. The reason you received the error rather than seeing "NO KBINPUT", however, is because you can't check for undefined global variables using the == operator unless you check them in terms of the window object. E.x. kbinput==undefined throws an error, but window.kbinput==undefined would show your error message. Object properties need not be prepended with "window.", however -- globvar.kbinput==undefined would work just fine.

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