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check valid tag id

 
Ranch Hand
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I'd like to check if a given tag ID exists or not. I tried
typeof document.getElementById(givenID).innerHTML != "string"
or
document.getElementById(givenID).innerHTML != null

but both of them fail. Does someone know how to check if the given tag id is valid?

thanks.
 
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if(typeof(document.getElementById("someId")) != "undefined")alert("I am here");
 
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