79 lines
1.8 KiB
JavaScript
79 lines
1.8 KiB
JavaScript
const image = 'https://tdesign.gtimg.com/miniprogram/images/example2.png';
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const items = new Array(12).fill({ label: '标题文字', image }, 0, 12);
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Page({
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offsetTopList: [],
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data: {
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sideBarIndex: 1,
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scrollTop: 0,
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categories: [
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{
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label: '选项一',
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title: '标题一',
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badgeProps: {},
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items,
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},
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{
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label: '选项二',
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title: '标题二',
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badgeProps: {
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dot: true,
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},
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items: items.slice(0, 9),
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},
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{
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label: '选项三',
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title: '标题三',
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badgeProps: {},
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items: items.slice(0, 9),
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},
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{
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label: '选项四',
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title: '标题四',
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badgeProps: {
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count: 6,
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},
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items: items.slice(0, 6),
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},
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{
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label: '选项五',
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title: '标题五',
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badgeProps: {},
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items: items.slice(0, 3),
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},
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],
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},
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onLoad() {
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const query = wx.createSelectorQuery().in(this);
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const { sideBarIndex } = this.data;
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query
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.selectAll('.title')
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.boundingClientRect((rects) => {
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this.offsetTopList = rects.map((item) => item.top);
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this.setData({ scrollTop: rects[sideBarIndex].top });
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})
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.exec();
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},
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onSideBarChange(e) {
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const { value } = e.detail;
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this.setData({ sideBarIndex: value, scrollTop: this.offsetTopList[value] });
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},
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onScroll(e) {
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const { scrollTop } = e.detail;
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const threshold = 50; // 下一个标题与顶部的距离
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if (scrollTop < threshold) {
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this.setData({ sideBarIndex: 0 });
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return;
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}
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const index = this.offsetTopList.findIndex((top) => top > scrollTop && top - scrollTop <= threshold);
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if (index > -1) {
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this.setData({ sideBarIndex: index });
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}
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},
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});
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