cryptoanarchywiki.github.io/_posts/2016-04-26-javascript-validator-for-input-number.markdown

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layout	title	date	categories
post	Javascript Validator for Input Number	2016-04-26 04:19:22 +0700	others

This javascript will validate/allow the number only when event key is pressed. For example result of it:

tutorial above, when you can not directly add the attribute inside html tag. but if you can add it, you can following this tutorial bellow:

{% highlight html %}

<script type="text/javascript"> function isNumber(evt) { evt = (evt) ? evt : window.event; var charCode = (evt.which) ? evt.which : evt.keyCode; if (charCode > 31 && (charCode < 48 || charCode > 57)) { return false; } return true; } </script>

{% endhighlight %}

Refference: http://stackoverflow.com/a/7295864

hope it usefull.