From a question in this site I found the following code of romaintaz:
<script type="text/javascript">
function testField(field) {
var regExpr = new RegExp("^\d*\.?\d*$");
if (!regExpr.test(field.value)) {
// Case of error
field.value = "";
}
}
</script>
My question now is: How can I make this validator only accept numbers and nothing else? Any integer.
You can chance your regular expression to accept only numeric digits (only integer numbers):
function testField(field) {
var regExpr = /^[0-9]+$/;
if (!regExpr.test(field.value)) {
// Case of error
field.value = "";
}
}
- character to the RegExp: /^-?[0-9]+$/This will accept positive and negative integer number with not more than 17 digits.
<script type="text/javascript">
function testField(field) {
var regExpr = new RegExp("^-?\d{1,17}$");
if (!regExpr.test(field.value)) {
// Case of error
field.value = "";
}
}
</script>
To allow the possibly of signed integers:
function testField(field) {
var regExpr = new RegExp("^(\+|-)?\d+$");
if (!regExpr.test(field.value)) {
// Not a number
field.value = "";
}
}
