Uncaught ReferenceError: Invalid left-hand side in assignment

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You can’t assign a new value to the result of a function

$('input#q').val() = urlencode($('input#q').val());

Use this instead:

$('input#q').val(urlencode($('input#q').val()))

It wouldn’t work with the keypress either – maybe the page is simply submitted after the same js error occurs.

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