html - check number of digits onchange javascript -

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Hi I have a number input, so it works well in Explorer because there is no arrow in it and Chrome and new browsers It does not take into account the maximum length. 

  & lt; Input type = "text" id = "amount2" name = "quantity2" class = "amountBox" value = "0" onchange = "changecountmount (this.value)" maxlength = "4" onkeypress = "return / / dd.test (String.fromCharCode ((event || window.event) .which || (event || window .event) .which))); "/>

Maybe I can change the onkeypress function to check the quantity of digits?

Thank you very much.

Use the 'maximum' attribute to specify the length.


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