Question

How to restrict my text field to numbers only and limit them in two with a single function.

Answer 1

<script type="text/javascript">
    function ValidateField(FieldName){

        // Get fields value
        var FieldVal = document.GetElementById(FieldName).value;

        // Check it's a number, and then check it's range is correct
        // Alternatively you could do FieldVal.length
        if(!isNaN(FieldVal) && (FieldVal < 100 && FieldVal > -100))
            alert("Valid!");
        else
            alert("Invalid");
    }
</script>    

<input type="text" name="MyField" />
<button onclick="ValidateField('MyField')">Test</button>

I’ve interpreted ‘limit to 2’ to mean a number ranging from -99 to 99.