Rewritten infinite scrolling

utils/infinitescroll/NextIndex.go

@@ -0,0 +1,21 @@
+package infinitescroll
+
+import (
+	"strconv"
+
+	"github.com/aerogo/aero"
+)
+
+// NextIndex calculates the next index and sends HTTP header
+func NextIndex(ctx *aero.Context, allElementsLength int, elementsPerScroll int, index int) int {
+	nextIndex := index + elementsPerScroll
+
+	if nextIndex >= allElementsLength {
+		nextIndex = -1
+	}
+
+	// Send the index for the next request
+	ctx.Response().Header().Set("X-LoadMore-Index", strconv.Itoa(nextIndex))
+
+	return nextIndex
+}