Hi,

Thank you for posting in the Infragistics community !

First, let me know that with 15.2 release all Ignite UI editors  have been re-architected to optimize their usability. Thus the behavior of the maxDecimals property was changed as per your observations show. This change is by design and is the expected behavior of the new editors suite. If you want to keep the other behavior , you can achieve this using the following workaround, which rounds the value in the valueChanging event:

$("#federalTax").igCurrencyEditor({
 listItems: listValues,
 maxDecimals: 4,
 value: 600,
 valueChanging: function (evt, ui) {
    var pos = ui.owner.options.maxDecimals;
    num = parseFloat(ui.editorInput.val());
    ui.newValue = Math.round(num * Math.pow(10,pos)) / Math.pow(10,pos);
    ui.owner.value(ui.newValue);
 }
});

Please let me know if you have further questions on the matter, I will be glad to help.

Based on your own JSFiddle examples, I have created one with the code you suggest.  To see it in action, enter 0.12345999 into the textbox, then click out of it.  If you open the console, you will see that the actual value for the editor changed to 0.12346, but the displayed value still shows $0.12345.  If you edit the textbox again, the edited value will again display 0.12345.

How can we permanently set the underlying value and have the displayed value update correctly?

Thank you.

For anyone else whom might need this at a later time, this is how I did it:

$(function () {
    
    // redefine the igCurrencyEditor widget to override methods
    // with our own functionality
    $.widget("ui.igCurrencyEditor", $.ui.igCurrencyEditor, {

        _triggerInternalValueChange: function (value) {
            // wrap value in an object so we can pass by-reference
            var valueRef = { ref: value };
            
            var noCancel = this._triggerValueChanging(valueRef);
            
            // pull the reference value back out and
            //continue passing it along
            value = valueRef.ref;
            
            if (noCancel) {
                this._processInternalValueChanging(value);
                this._triggerValueChanged(value)
            }
        },
    });
    
    $("#medicare").igCurrencyEditor({
        allowNullValue: true,
        dataMode: 'double',
        maxDecimals: 5,
        minDecimals: 5,
        scientificFormat: false,
        selectionOnFocus: 'selectAll',
        spinDelta: 0,
        suppressNotifications: true,
        textAlign: 'right',
        valueChanging: function (evt, ui) {
            var pos = ui.owner.options.maxDecimals;
            num = parseFloat(ui.editorInput.val());
            
            // use ui.newValue.ref, rather than
            // ui.newValue, to utilize the reference we
            // set up in the igCurrency Editor override
            ui.newValue.ref = Math.round(num * Math.pow(10,pos)) / Math.pow(10,pos);
            ui.owner.value(ui.newValue.ref);
        }
    });
    
});

Thanks