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Asked: 2026-05-11T13:36:24+00:00

I;m trying yo implement a javacript function which will not allow to the user

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I;m trying yo implement a javacript function which will not allow to the user to input anything else than float numbers (digits)

This is my approach but I don’t know how to improve it in order to allow submition of negatives numbers also (allow ‘-‘ key) and work on IE also. 

function digits_only(evt, form) {     var evt = evt || window.event,         targ = evt.target || evt.srcElement,         charCode = evt.which || evt.keyCode,         keyChar = String.fromCharCode(charCode),         isValid = true;     if (charCode > 13) {         isValid = /[0-9.]/.test(keyChar);         //if a dolt is already in input         if (keyChar === '.' && /\./.test(targ.value)) {             isValid = false;         }     }     return isValid; }
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1 Answer

  1. I think you are looking for so called ‘input masks’. They are a lot more powerful then just allowing numbers. But you can surly use them for that. Google ‘javascript input mask’ or check out this jQuery Plugin.

    EDIT: Seems like the linked plugin only supports fixed length masks, but the term may be a good starting point…

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