Validating Number.

Posted by vishalneeraj-24503 under JavaScript category on 11/24/2014 | Points: 40 | Views : 861

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function Validate_Numbers(a)
{
            var numStr = "1234567890";
            var thisChar;
            var counter = 0;
            for (var i = 0; i <= a.length-1; i++)
            {
                thisChar = a.substring(i, i + 1);

                if (numStr.indexOf(thisChar) != -1)
                {
                    counter++;
                }
            }
            if (counter == (a.length))
            {
                alert("valid  Number"); 
                return true;
            }
            else
            {
                alert("Enter valid  Number");                
            }
}

<asp:Button ID="Button3" runat="server" Text="Button" 
OnClientClick="Validate_Numbers('vishalkumar'); return false;"/>
<asp:Button ID="Button4" runat="server" Text="Button" 
OnClientClick="Validate_Numbers('84235423535'); return false;"/>

Output:- valid number
Enter valid Number

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Comments or Responses

Posted by: kgovindarao523-21772 on: 12/4/2014 Level:Bronze | Status: [Member] [MVP] | Points: 10

Hi,

Why shouldn't we check whether the given text is number or not using JavaScript isNaN() Function.

function Validate_Numbers(a)
{
 var isNotNumber=isNaN(a);
if(isNotNumber)
{
 alert("Enter valid  Number");
}else alert("Valid  Number");
return isNotNumber;
}

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