javascript - How to decrease number [value] before post? -

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i not sure possible if user type numbers in input, want decrease number in hidden before post? example if type 1 output 0 or if type 2 output 1 

<input class="decrease" type="text" name="number" value="" /> <input class="output" type="hidden" name="number" value="//decrease number//" />

hope 1 helps. 

$(document).ready(function(){     $('.decrease').keyup(function(){         if($('.decrease').val()!="")         {             $('.output').val($('.decrease').val()-1);         }         else         {             $('.output').val("");         }      }); });

you have make sure user types in numbers. if user types in character, value of hidden input nan.

see documentation more examples , information.


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