In your html page add the control you want to
validate but for this sample I used textbox to demonstrate this code, in my
textbox control I used onkeyup event to validate whether recently entered
charecter is numeric or not. so you can call this JavaScript code as your
requirement in your project
Test.html
<input type="text" id="txt" name="txt" onkeyup="txtValidate(this.id)"/>
JavaScript Code
function
txtValidate(txtid) {
var ok = 0;
var a = document.getElementById(txtid).value;
for (var i = 0;
i <= a.length - 1; i++) {
var j = a.charCodeAt(i);
for (var k = 48;
k <= 57; k++) {
ok = 0;
if (k == j) {
ok = 1;
break;
}
}
}
if (ok == 0) {
alert("Only
Numeric Values Allowed");
document.getElementById(txtid).value = "";
for (var i = 0;
i < a.length - 1; i++) {
var j = a.charCodeAt(i);
for (var k = 48;
k <= 57; k++) {
ok = 0;
if (k == j) {
document.getElementById(txtid).value += a.charAt(i);
}
}
}
}
}
I hope this code helps you.
Thank you.