validation of characters and phone numbers in javascript on keypress event

Question

1.00/5 (1 vote)

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i am making a form in which when user enters any digits in name field nothing will happen and i know that i have to use onkeypress event in textbox but it is not working why? my code is as :

XML

<html>
<head>
<title>string</title>
<script language=javascript>
{
function f(){

var el=document.f1.t1.value;
var re=/^[A-z]+$/;
if(!re.test(el.value) )
 {
alert("please enter char only");
 }

}

 </script>
</head>
<body>
<form name = f1>
<input type = text onkeypress="return f()" name = t1>
<input type=button value=ok >
</form>
</body>
</html>

also i want to validate a user entering only 97 or 98 at first two positions like if user enters 9898569854 or 9756985698 they are acceptable but if user enters 9565896589 then it alerts but this should happen on button click why my code is not working although it seems to me corect. code is as follows:

C#

function phnoValidation()
        {
           var b;
           b = document.form1.TextBox4.value;
            if (b.charCodeAt(0) == 57 && b.charCodeAt(1) == 56)
             {
               return true;
            }
            else if (b.charCodeAt(0) == 57 && b.charCodeAt(1) == 55)
            {
               alert("this number is acceptable");
                return true;
           }
            else
               alert("this number is not acceptable");
            return false;
      }

Thank u.

Posted 23-Jun-13 19:32pm

Rambo_Raja

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2 solutions

Solution 1

SQL

IS javascript is the only solution you want or would you like to try the following....

http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/FilteredTextBox/FilteredTextBox.aspx

and further to restrict the user entry's startingpoint.. ie. to be start with some specific numbers.. you can use the regular expresssions..

https://www.google.com.pk/search?q=regular+expression+to+restrict+number+starting+from+97&oq=regular+expression+to+restrict+number+starting+from+97&aqs=chrome.0.57.9790j0&sourceid=chrome&ie=UTF-8#sclient=psy-ab&q=only+number+starting+with+10+regular+expression&oq=only+number+starting+with+10+regular+expression&gs_l=serp.3..33i21l2.14704.23117.0.23300.47.45.0.2.2.1.474.10943.2-39j3j1.43.0...0.0.0..1c.1.17.psy-ab.28LML896i6A&pbx=1&bav=on.2,or.r_qf.&bvm=bv.48293060,d.ZGU&fp=8dc10a1e8187e983&biw=1280&bih=880[^]

Posted 24-Jun-13 2:39am

VICK

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Rambo_Raja · Accepted Answer · 2013-06-25T21:20:00

Its easy:
For Validation of Phone Number that starts with only 97,98.

C#

function phval() {
            var a;
            a = document.getElementById("TextBox5").value;
            if (a.charCodeAt(0) == 57 && (a.charCodeAt(1) == 56 || a.charCodeAt(1) == 55)) {
                alert("valid");
            }
            else {
                alert("invalid");
            }
        }

For Character validation that is user cannot enter numbers in name field. code is in( JSP.)

C#

function isNumberKey(evt)
 {
     var charCode = (evt.which) ? evt.which : event.keyCode
     if (charCode > 31 && (charCode < 48 || charCode > 57))
         return true;

     return false;
 }

Thank u all. ;)