Hi all,
I would like to get the Javascript code to check the textbox contains only numeric values or numbers..
I am using asp.net and c#.net..
Please help me..
Regards,
Mathew
23  138258  gits 5,390
Recognized Expert Moderator Expert
hi ...
you may use javascript built in isNaN() method for that ... it returns true in case it is NotaNumber else you get a false ...
kind regards
hi ...
you may use javascript built in isNaN() method for that ... it returns true in case it is NotaNumber else you get a false ...
kind regards
Hi Gits,
Can you please give an example for that???
regards,
Mathew
gits 5,390
Recognized Expert Moderator Expert
ok ... lets assume following example: - <html>
-
<head>
-
<script type="text/javascript">
-
function check_field(id) {
-
var field = document.getElementById(id);
-
-
if (isNaN(field.value)) {
-
alert('not a number');
-
}
-
}
-
</script>
-
</head>
-
<body>
-
<form>
-
<input type="text" id="t_field"/>
-
<input type="button" value="check" onclick="check_field('t_field');"/>
-
</form>
-
</body>
-
</html>
-
kind regards
HI ,
The code above using NAN will not work properly try this. - function checkNum(x)
-
{
-
-
var s_len=x.value.length ;
-
var s_charcode = 0;
-
for (var s_i=0;s_i<s_len;s_i++)
-
{
-
s_charcode = x.value.charCodeAt(s_i);
-
if(!((s_charcode>=48 && s_charcode<=57)))
-
{
-
alert("Only Numeric Values Allowed");
-
x.value='';
-
x.focus();
-
return false;
-
}
-
}
-
return true;
-
}
-
-
<input type="text" id="t_field" onChange='checkNum(this)'/>
This will execute on the field exit or tabbing out of the field.
Hope this would be useful.
gits 5,390
Recognized Expert Moderator Expert
HI ,
The code above using NAN will not work properly try this.
nope ... it is working properly for the requirement. it checks for numeric values and it works! you didn't say why or what is not working properly!
your code should check for only Integers? you simply could use one line for that: - // in case value is an integer test_result will be true
-
// otherwise it will be false
-
var test_result = /^\d+$/.test(value);
-
kind regards
Hi all,
I would like to check whether the textbox contains only nmumberic values by using javascript...
Please help me...
Regards,
Mathew
iam_clint 1,208
Recognized Expert Top Contributor
I would use something similar to this and just call this function everytime you need to know if its numeric -
<script>
-
function isNumeric(val) {
-
var numeric = true;
-
var chars = "0123456789.-,+";
-
var len = val.length;
-
var char = "";
-
for (i=0; i<len; i++) { char = val.charAt(i); if (chars.indexOf(char)==-1) { numeric = false; } }
-
return numeric;
-
}
-
</script>
-
so I would say if (isNumeric("wha tever value here")) { alert("Its Numeric!!!"); }
acoder 16,027
Recognized Expert Moderator MVP
Or use regular expressions: - function isNumeric(str) {
-
return /^\d$/.match(str);
-
}
iam_clint 1,208
Recognized Expert Top Contributor
Acoders way is better. Never even thought to do that :)
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