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The JavaScript FAQ
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Canceled prompt

Question: What value does prompt() return if the user clicked the Cancel button?

Answer: The return value of canceled prompt() depends on the browser. In some browsers the return value is null, in others it's '' (empty string). Therefore, you might want to use the following code when calling the prompt() method:

userInput = prompt('Prompt text','Suggested input');
if (userInput != '' && userInput != null) {
 // do something with the input
} Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
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  Mirrored with kind permission of Alexei Kourbatov Design by Interspire