fix(List): skip check when inside an inactive tab (#8741)

src/composables/use-tab-status.ts

@@ -0,0 +1,8 @@
+import { inject, ComputedRef } from 'vue';
+
+// eslint-disable-next-line
+export const TAB_STATUS_KEY = Symbol();
+
+export function useTabStatus() {
+  return inject<ComputedRef<boolean> | null>(TAB_STATUS_KEY, null);
+}

src/list/List.tsx

@@ -14,6 +14,7 @@ import { isHidden, truthProp, createNamespace } from '../utils';
 // Composables
 import { useRect, useScrollParent, useEventListener } from '@vant/use';
 import { useExpose } from '../composables/use-expose';
+import { useTabStatus } from '../composables/use-tab-status';
 
 // Components
 import { Loading } from '../loading';
@@ -50,11 +51,18 @@ export default defineComponent({
     const loading = ref(false);
     const root = ref<HTMLElement>();
     const placeholder = ref<HTMLElement>();
+    const tabStatus = useTabStatus();
     const scrollParent = useScrollParent(root);
 
     const check = () => {
       nextTick(() => {
-        if (loading.value || props.finished || props.error) {
+        if (
+          loading.value ||
+          props.finished ||
+          props.error ||
+          // skip check when inside an inactive tab
+          tabStatus?.value === false
+        ) {
           return;
         }
 
@@ -62,7 +70,7 @@ export default defineComponent({
         const scrollParentRect = useRect(scrollParent);
 
         if (!scrollParentRect.height || isHidden(root)) {
-          return false;
+          return;
         }
 
         let isReachEdge = false;

src/list/test/index.spec.js

@@ -1,4 +1,6 @@
 import { List } from '..';
+import { Tab } from '../../tab';
+import { Tabs } from '../../tabs';
 import { mount, later, mockGetBoundingClientRect } from '../../../test';
 
 test('should emit load event when reaching bottom', async () => {
@@ -134,3 +136,25 @@ test('should render correctly when direction is up', async () => {
   expect(children[0].classes()).toContain('list-item');
   expect(children[1].classes()).toContain('van-list__placeholder');
 });
+
+test('should not emit load event when inside an inactive tab', async () => {
+  const onLoad1 = jest.fn();
+  const onLoad2 = jest.fn();
+
+  mount({
+    render: () => (
+      <Tabs active={0} animated>
+        <Tab>
+          <List onLoad={onLoad1} />
+        </Tab>
+        <Tab>
+          <List onLoad={onLoad2} />
+        </Tab>
+      </Tabs>
+    ),
+  });
+
+  await later();
+  expect(onLoad1).toHaveBeenCalledTimes(1);
+  expect(onLoad2).toHaveBeenCalledTimes(0);
+});

src/tab/Tab.tsx

@@ -1,6 +1,8 @@
 import {
   ref,
   watch,
+  provide,
+  computed,
   nextTick,
   PropType,
   CSSProperties,
@@ -14,6 +16,7 @@ import { TABS_KEY, TabsProvide } from '../tabs/Tabs';
 // Composables
 import { useParent } from '@vant/use';
 import { routeProps } from '../composables/use-route';
+import { TAB_STATUS_KEY } from '../composables/use-tab-status';
 
 // Components
 import { SwipeItem } from '../swipe-item';
@@ -56,15 +59,15 @@ export default defineComponent({
       }
     };
 
-    const isActive = () => {
+    const active = computed(() => {
-      const active = getName() === parent.currentName.value;
+      const isActive = getName() === parent.currentName.value;
 
-      if (active && !inited.value) {
+      if (isActive && !inited.value) {
         init();
       }
 
-      return active;
+      return isActive;
-    };
+    });
 
     watch(
       () => props.title,
@@ -74,6 +77,8 @@ export default defineComponent({
       }
     );
 
+    provide(TAB_STATUS_KEY, active);
+
     return () => {
       const { animated, swipeable, scrollspy, lazyRender } = parent.props;
 
@@ -81,15 +86,14 @@ export default defineComponent({
         return;
       }
 
-      const active = isActive();
+      const show = scrollspy || active.value;
-      const show = scrollspy || active;
 
       if (animated || swipeable) {
         return (
           <SwipeItem
             role="tabpanel"
-            aria-hidden={!active}
+            aria-hidden={!active.value}
-            class={bem('pane-wrapper', { inactive: !active })}
+            class={bem('pane-wrapper', { inactive: !active.value })}
           >
             <div class={bem('pane')}>{slots.default?.()}</div>
           </SwipeItem>