Hi Josh,

If you use range, then I think, there is no need for any validation checks on client, because value in editor should be always valid (well, until end user will find a way to submit without leaving focus while editing). I assume that you use NumericEditorFor or CurrencyEditorFor or similar for your Qty field in model, othewise, range validation will have no effect or it will have unpredictable results. The range is converted by Mvc server to min/maxValue options. If initial value is not in range, then editor will set closest value: in your particular example it will be 12. When end user will enter invalid number, then error message should appear and if end user leaves focus, then editor should adjust its value to min/max limit automatically. Application may check if value is valid, but it may return false only while editor has invalid value and focus at the same time. I wrote for you example, which does validation onmouseover a button. To test, you may enter wrong value and move mouse over button.

Note: you should not use something like
var isValid = $('#Qty').igValidator('isValidState');
because it may work only when INPUT of igEditor has the id=Qty. That will fail if editor has buttons, because that id is applied to outer SPAN and INPUT has no id at all.
You should get reference to igValidator directly from igEditor.

<%: Html.Infragistics().NumericEditorFor(m => m.Qty).
    // example to enable spin buttons
    //ButtonType(TextEditorButtonType.Spin).
    // example to customize igValidator on server
    //ValidatorOptions(vo => vo.KeepFocus(ValidatorKeepFocus.Always)).
    Render() %>

<script type="text/javascript">
   function validateQty() {
    var vld = $('#Qty').igEditor('validator');
    var isValid = vld ? vld.isValidState() : '?';
    alert('isValid:' + isValid);
   }
</script>
<input type="button" value="check" onmouseover="validateQty()" />

Thanks Tsvetelina.  However, the online sample link you provided is broken.

Also, if I've included the entire infragistics.js file, do I still need to use the loader?