From 31d5d12625b7961d9028e25a98f9142af4a903d0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mai=20Minh=20Ho=C3=A0ng?=
 <135428813+Hoang130203@users.noreply.github.com>
Date: Thu, 26 Mar 2026 14:53:18 +0700
Subject: [PATCH] fix(prefill): respect loadOnScroll flag in _prefillNext to
 prevent auto-load in trigger mode (#886)

When using trigger mode, Trigger.bind() calls ias.disableLoadOnScroll()
during the BINDED event. However, prefill._prefillNext() was calling
ias.next() directly without checking the loadOnScroll flag, bypassing
trigger mode entirely.

This caused an unwanted automatic page load on reload when:
1. The user configured trigger mode (no loadOnScroll: false explicitly)
2. The browser restored scroll position near the sentinel
3. Prefill ran and saw distance <= 0, firing next() unconditionally

Fix: guard _prefillNext() with a loadOnScroll check so that when trigger
mode (or any other mechanism) disables auto-loading, prefill respects it.
---
 src/prefill.js | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/prefill.js b/src/prefill.js
index 292c75d4..aea6acc3 100644
--- a/src/prefill.js
+++ b/src/prefill.js
@@ -22,6 +22,16 @@ export default class Prefill {
   }
 
   _prefillNext() {
+    // Respect the loadOnScroll flag. When trigger mode is active,
+    // Trigger.bind() calls disableLoadOnScroll() during the BINDED event,
+    // which fires before prefill runs. Without this guard, prefill would
+    // call next() unconditionally and bypass trigger mode, causing an
+    // unexpected auto-load on reload when the scroll position is restored
+    // near the sentinel. See: https://github.com/webcreate/infinite-ajax-scroll/issues/886
+    if (!this.ias.loadOnScroll) {
+      return;
+    }
+
     let distance = this.ias.distance();
 
     if (distance > 0) {