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@ -7,18 +7,16 @@ |
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</view> |
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</view> |
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<view class="u-menu-wrap"> |
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<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop" |
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:scroll-into-view="itemId"> |
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<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view"> |
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<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item" |
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:class="[current == index ? 'u-tab-item-active' : '']" @tap.stop="swichMenu(index)"> |
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<text class="u-line-1">{{item.name}}</text> |
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</view> |
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</scroll-view> |
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<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box" |
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@scroll="rightScroll"> |
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<scroll-view :scroll-top="scrollRightTop" scroll-y scroll-with-animation class="right-box"> |
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<view class="page-view"> |
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<view class="class-item" :id="'item' + index" v-for="(item , index) in tabbar" :key="index"> |
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<view class="item-box" v-for="(item1, index1) in item.children" :key="index1"> |
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<view class="class-item"> |
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<view class="item-box" v-for="(item1, index1) in tabbarList.children" :key="index1"> |
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<view class="item-title"> |
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<text>{{item1.name}}</text> |
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</view> |
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@ -43,18 +41,10 @@ |
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export default { |
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data() { |
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return { |
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scrollTop: 0, //tab标题的滚动条位置 |
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oldScrollTop: 0, |
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current: 0, // 预设当前项的值 |
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menuHeight: 0, // 左边菜单的高度 |
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menuItemHeight: 0, // 左边菜单item的高度 |
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itemId: '', // 栏目右边scroll-view用于滚动的id |
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tabbar: [], |
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menuItemPos: [], |
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arr: [], |
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scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度 |
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timer: null, // 定时器 |
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tabbarList: [], |
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scrollRightTop: 0, |
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} |
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}, |
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onLoad() { |
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@ -78,17 +68,10 @@ |
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}, |
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// 点击左边的栏目切换 |
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async swichMenu(index) { |
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console.log(index) |
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if (this.arr.length == 0) { |
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await this.getMenuItemTop(); |
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} |
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if (index == this.current) return; |
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this.scrollRightTop = this.oldScrollTop; |
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this.$nextTick(function() { |
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this.tabbarList = [] |
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this.current = index; |
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this.scrollRightTop = this.arr[index]; |
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this.leftMenuStatus(index); |
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}) |
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this.tabbarList = this.tabbar[index]; |
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this.getMenuItemTop() |
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}, |
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getGoodsTypeList() { |
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const that = this; |
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@ -97,105 +80,25 @@ |
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// is_hot: 0 |
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}) |
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.then(res => { |
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// 合并新数据 |
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console.log(res, '分类数据') |
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that.tabbar = res.data.list; |
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that.tabbarList = res.data.list[0] |
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}) |
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.catch(reject) |
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}) |
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}, |
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// 获取一个目标元素的高度 |
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getElRect(elClass, dataVal) { |
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new Promise((resolve, reject) => { |
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const query = uni.createSelectorQuery().in(this); |
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query.select('.' + elClass).fields({ |
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size: true |
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}, res => { |
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// 如果节点尚未生成，res值为null，循环调用执行 |
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if (!res) { |
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setTimeout(() => { |
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this.getElRect(elClass); |
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}, 10); |
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return; |
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} |
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this[dataVal] = res.height; |
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resolve(); |
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}).exec(); |
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}) |
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}, |
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// 观测元素相交状态 |
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async observer() { |
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this.tabbar.map((val, index) => { |
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let observer = uni.createIntersectionObserver(this); |
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// 检测右边scroll-view的id为itemxx的元素与right-box的相交状态 |
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// 如果跟.right-box底部相交，就动态设置左边栏目的活动状态 |
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observer.relativeTo('.right-box', { |
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top: 0 |
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}).observe('#item' + index, res => { |
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if (res.intersectionRatio > 0) { |
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let id = res.id.substring(4); |
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this.leftMenuStatus(id); |
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} |
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}) |
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}) |
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}, |
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// 设置左边菜单的滚动状态 |
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async leftMenuStatus(index) { |
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// 如果为0，意味着尚未初始化 |
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if (this.menuHeight == 0 || this.menuItemHeight == 0) { |
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await this.getElRect('menu-scroll-view', 'menuHeight'); |
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await this.getElRect('u-tab-item', 'menuItemHeight'); |
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} |
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// 将菜单活动item垂直居中 |
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this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2; |
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this.current = index-1; |
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}, |
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// 获取右边菜单每个item到顶部的距离 |
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getMenuItemTop() { |
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new Promise(resolve => { |
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let selectorQuery = uni.createSelectorQuery(); |
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selectorQuery.selectAll('.class-item').boundingClientRect((rects) => { |
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// 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行 |
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if (!rects.length) { |
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setTimeout(() => { |
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this.getMenuItemTop(); |
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}, 10); |
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return; |
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} |
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rects.forEach((rect) => { |
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// 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况) |
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this.arr.push(rect.top - rects[0].top); |
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console.log(rects[0].top) |
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this.scrollRightTop = rects[0].top |
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resolve(); |
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}) |
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}).exec() |
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}) |
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}, |
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// 右边菜单滚动 |
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async rightScroll(e) { |
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this.oldScrollTop = e.detail.scrollTop; |
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if (this.arr.length == 0) { |
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await this.getMenuItemTop(); |
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} |
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if (this.timer) return; |
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if (!this.menuHeight) { |
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await this.getElRect('menu-scroll-view', 'menuHeight'); |
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} |
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setTimeout(() => { // 节流 |
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this.timer = null; |
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// scrollHeight为右边菜单垂直中点位置 |
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let scrollHeight = e.detail.scrollTop; |
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for (let i = 0; i < this.arr.length; i++) { |
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let height1 = this.arr[i]; |
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let height2 = this.arr[i + 1]; |
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// 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可 |
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if (!height2 || scrollHeight >= height1 && scrollHeight < height2) { |
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this.leftMenuStatus(i+1); |
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return; |
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} |
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} |
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}, 10) |
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} |
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} |
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} |
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</script> |
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@ -276,12 +179,11 @@ |
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} |
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.page-view { |
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padding: 0 16rpx 16rpx; |
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overflow: hidden; |
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} |
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.class-item { |
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margin-bottom: 12rpx; |
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margin-bottom: 30rpx; |
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background-color: #fff; |
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padding: 20rpx; |
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border-radius: 8rpx; |
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fanfan
1 year ago