Some time ago I needed to find all dirty attributes on form. Easy I thought. It occurs that some at some entitites getIsDirty() flag for field statuscode is always set – check on clean form load. To get all changed fields I’ve written method that read all dirty fields on form excluding specified fields.

GetDirtyFields: function() {
    /// <summary>
    /// Returns array of dirty attributes info.
    /// </summary>

    var excludedFields = arguments;

    function IsFieldExcluded(fieldName) {

        for (var i = 0; i < excludedFields.length; i++) {
            if (excludedFields[i] == fieldName)
                return true;
        }

        return false;
    };

    var attributes = Xrm.Page.getAttribute();
    var dirtyAttributes = new Array();

    attributes.forEach(function(formAttribute, index) {

        var attributeName = formAttribute.getName();

        if (formAttribute.getIsDirty() && !IsFieldExcluded(attributeName)) {
            debugger;
            var attributeTextValue = formAttribute.getValue().toString();
            var attributeLabel = Xrm.Page.ui.controls.get(attributeName).getLabel();

            dirtyAttributes.push({
                Name: attributeName,
                TextValue: attributeTextValue,
                Label: attributeLabel,
                Index: index
            });
        }
    });

To be sure all fields has its ‘dirty’ flag please do read this.