Building on the setRenderer error getFieldsUsedInExpressions is not a function question, I built a ClassBreakRenderer widget that has a classification field and a normalization field, plus a legend. Normalization works with attributes from the feature class.
I'm trying to build in a NULL value to the normalization field so that it can be set to null by default, leaving just the classification to set the map symbology.
var noSelect = {
value: null,
label: "none"
};
I push this to an array that holds the field values, then loop through the field values to add to the array.
var normFields = []; //normalization fields
normFields.push(noSelect); //add NULL value
