Allow Only Numbers to Enter From Input field

HTML Code

<input type=”text” class=”form-control” name=”phone” id=”phone” value=”” onkeypress=”return onlyNos(event,this);” maxlength=”13″ />

JavaScript Code

function onlyNos(e, t) {
try {
if (window.event) {
var charCode = window.event.keyCode;
}
else if (e) {
var charCode = e.which;
}
else { return true; }
if (charCode > 31 && (charCode < 48 || charCode > 57)) {
return false;
}
return true;
}
catch (err) {
alert(err.Description);
}
}

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