javascript - null pointer expection in IE and not in Firefox, why does this happen? -

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i have script loops through array of html tag id's, elements in array empty. have if statement works fine in firefox throws null pointer or not object error in ie 

if((storedvars.id) != ("")){selenium.browserbot.getcurrentwindow().document.getelementbyid(storedvars.id).type;}

why fail in ie , not in firefox , proper syntax ie?

in ie might undefined or null rather empty string, try instead:

if(storedvars.id && storedvars.id !== "")

(also bit more efficient due !== operator comparing 2 strings)


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