TypeError: getElementById is null

Answer 1

You are executing javascript before your 'body' rendered. Thus document.getElementById("submit") would return null. Because there are no "submit" DOM element yet.

One solution is to move your javascripts under 'body', Or use JQuery with

$(document).ready(function() {
    ...
});

Your variable also has scope problem, your function cannot access variable declared outside this function with 'var' declaration. If you really need that variable, you should remove 'var' declaration. A better way is to move all your variable inside clicked function. like following code

    
    

    
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 | herbykit
    

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