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fix(Sticky): fix sticky wrap empty #5325

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fix(Sticky): fix sticky wrap empty #5325

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12 changes: 12 additions & 0 deletions packages/sticky/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,7 @@ VantComponent({

mounted() {
this.onScroll();
this.observeWrap();
},

methods: {
Expand Down Expand Up @@ -130,5 +131,16 @@ VantComponent({
(resolve) => nodesRef.boundingClientRect(resolve).exec()
);
},

observeWrap() {
// 如果子元素没有内容了 高度为0 取消掉fixed
const observer = wx.createIntersectionObserver(this);
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两个问题

  1. 监听需要在组件卸载时回收
  2. 有没有更好的办法，监听回调在滚动时是否会触发？需要考虑一定的性能问题

observer.relativeToViewport();
observer.observe(`.van-sticky-wrap`, (res) => {
if (!res.boundingClientRect.height) {
this.setDataAfterDiff({ fixed: false, height: 0 });
}
});
},
},
});