javascript for entring numerics and dot(.) also allow backspace for a textbox

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heyyy...

I want a javascript that allows only numerics and dot(.) also allow backspace ..

the purpose is to enter amount(price) in a txtbox...

I used a javascript but it does not allow backspace ...check it... and give a solution

XML

<asp:TextBox ID="txtCloseReading" runat="server" attr-identity="CloseReading" MaxLength="10" CausesValidation="true"
                                            oncopy="return false" onpaste="return false" onkeypress="return NumberKeyAndDotKey(this.value,event);"></asp:TextBox>

C#

function NumberKeyAndDotKey(StringValue, evt)
           {
               var status = false;
               var charCode = (evt.which) ? evt.which : event.keyCode;

               if (charCode == '46' ||  (charCode >= '48' && charCode <= '57')) {

                   status = true;
                   if (contains(StringValue, '.')) {

                   if(  (charCode >= '48' && charCode <= '57'))
                   {
                   status = true;
                   }
                   else
                   {
                   status = false;
                   }




                   }
               }
               return status;

           }

Posted 21-Jan-13 18:03pm

aravindnass

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2 solutions

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Renju Vinod · Accepted Answer · 2013-01-21T18:53:00

Solution 2

ASP.NET

<asp:TextBox ID="txtCloseReading" runat="server" attr-identity="CloseReading" MaxLength="10" CausesValidation="true"oncopy="return false" onpaste="return false"></asp:TextBox>

JavaScript

$('#txtCloseReading').keypress(function (e) {
        if ((e.which != 8 && e.which != 0 && (e.which < 48 || e.which > 57)) && e.which != 46) {
            return false;
        }
});

Posted 21-Jan-13 18:53pm

Renju Vinod

Updated 21-Jan-13 18:54pm

v2

Comments

aravindnass 23-Jan-13 5:40am

haii...now I have a problem if I enter only '.' then it will not checked ..it is prcossed

aravindnass 23-Jan-13 5:41am

plz help ..it allow or accepts '.' dot without entering the any numerics

Vishal.Shimpi144 · Accepted Answer · 2013-01-21T18:12:00

Solution 1

allow the ascii for backspace also like you have written for dot(.) and all numbers.
write your if condition as give bellow

if (charCode == '8' || charCode == '46' ||  (charCode >= '48' && charCode <= '57'))

Posted 21-Jan-13 18:12pm

Vishal.Shimpi144

Comments

aravindnass 23-Jan-13 5:40am

haii...now I have a problem if I enter only '.' then it will not checked ..it is prcossed

aravindnass 23-Jan-13 5:41am

plz help ..it allow or accepts '.' dot without entering the any numerics