How to validate integer for a textbox via javascript in asp.net

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C#

C#4.0

How to validate integer for a textbox via javascript in asp.net

Posted 21-Jun-13 4:54am

Korathu 2

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Bilashcse · Answer 1 · 2013-06-21T19:16:00

function isNumberKey(textboxvalue)
{
evt=textboxvalue.text;
var charCode = (evt.which) ? evt.which : event.keyCode
if (charCode > 31 && (charCode < 48 || charCode > 57))
textboxvalue.text="Enter in Integer Only";
return false;

return true;
}

José Amílcar Casimiro · Answer 2 · 2013-06-21T06:58:00

Solution 1

Hello,

C#

var intRegex = /^\d+$/;
if(intRegex.test(someNumber)) {
   alert('I am an int');
   ...
}

Cya

Posted 21-Jun-13 6:58am

José Amílcar Casimiro

Balimusi · Answer 3 · 2013-06-21T11:01:00

Try this. Please note that the "===" is placed there on purpose.

JavaScript

function isInteger(value) {
    if ($.trim(value) === "") { return true; }
    if ((parseFloat(value) == parseInt(value)) && !isNaN(value) && parseInt(value) > 0) {
        return true;
    } else {
        return false;
    }
}

How to validate integer for a textbox via javascript in asp.net

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