Update sliding-child.js

Added ajax beforeSend to allow caller to specify data for request.

features/slidingChild/js/sliding-child.js

@@ -56,7 +56,11 @@
                 $.ajax({
                     type: opts.ajax.requestType,
                     url: opts.ajax.requestUrl,
-                    data: opts.ajax.requestData,
+                    beforeSend: function(xhr, settings) {
+                        if (opts.ajax.getRequestData) {
+                            this.data = opts.ajax.getRequestData(dtRow);
+                        }
+                    },
                     contentType: opts.ajax.contentType,
                     dataType: opts.ajax.dataType,
                     success: function (response) {