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在使用uView
开发项目中,遇到了一个业务场景: 点击输入框弹出底部窗口,内置电话号码区号索引列表,点击切换区号 :
当我根据逻辑以为在 u-popup 里加入 u-index-list 就行了,结果遇到问题了:
所以作者开始排查,但api文档没写相关用法,于是开始百度,但发现大家都在询问…(可能大家也百度过这类文章:https://ask.dcloud.net.cn/question/103729)
官网也没有合适满意的解决方案,于是作者只能去修改源码了…
一开始很奇怪,看人家实例是可以滚动,但在u-popup
不行,原来文档写了onPageScroll
这个方法的,是针对整个页面去滚动的:
所以针对业务场景,这个方法就不适用了,首先是想到在u-popup
里面加入一层scroll-view
,但没用… 看文档得知原来组件里已内置了(还是要好好看文档呀~),所以这个也是无效的。
解决方法:监听弹出层的滚动,利用子组件把弹出层的scrollTop
传给父组件里的u-index-list
u-popup
的scrollTop
:首先找出目标代码,在u-index-list
里:
这里是针对整个页面去滚动吸顶的,所以同理把这段代码去掉,把容器距离顶部的高度传给父组件:
把u-popup
滚动高与容器的高度添加:
定位到目标代码:
备注: 修改源码前要先理解源码的逻辑噢~
然后根据你弹出层的高度进行增减就行啦。
下面是完整代码:
<u-popup :scrollTopBox="scrollTopBox" v-model="show" mode="bottom" height="1028rpx" @scroll="scroll"> <!-- tab --> <view class="tabs"> <view class="tabs_wrapper"> <view class="tabs_wrapper_nav"> <view class="tabs"><text>国字区号</text></view> <view class="tabs__line"></view> </view> <view class="cancel_button"><text @click="show = false">取消</text></view> </view> </view> <u-index-list :scrollTop="scrollTop" @select="select" :index-list="indexList" activeColor="#e00202"> <view v-for="(item, index) in cityArr" :key="index"> <u-index-anchor :index="item.letter" /> <view class="list-cell" v-for="(item1, index) in item.data" :key="index" @click="selected(item1.code)"> <text>{{ item1.en }}</text> <text>{{ item1.code }}</text> </view> </view> </u-index-list> </u-popup>
data() { return { show: false, scrollTop: 0, scrollTopBox: 0, indexList: ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'Y', 'Z'], }, methods:{ scroll(val) { // console.log(val) this.scrollTop = val; }, select(index) { this.scrollTopBox = index + this.scrollTop; }, }
u-popup
组件:
<template> <view v-if="visibleSync" :style="[customStyle, { zIndex: uZindex - 1 }]" class="u-drawer" hover-stop-propagation> <u-mask :duration="duration" :custom-style="maskCustomStyle" :maskClickAble="maskCloseAble" :z-index="uZindex - 2" :show="showDrawer && mask" @click="maskClick"></u-mask> <view class="u-drawer-content" @tap="modeCenterClose(mode)" :class="[ safeAreaInsetBottom ? 'safe-area-inset-bottom' : '', 'u-drawer-' + mode, showDrawer ? 'u-drawer-content-visible' : '', zoom && mode == 'center' ? 'u-animation-zoom' : '' ]" @touchmove.stop.prevent @tap.stop.prevent :style="[style]" > <view class="u-mode-center-box" @tap.stop.prevent @touchmove.stop.prevent v-if="mode == 'center'" :style="[centerStyle]"> <u-icon @click="close" v-if="closeable" class="u-close" :class="['u-close--' + closeIconPos]" :name="closeIcon" :color="closeIconColor" :size="closeIconSize" ></u-icon> <scroll-view class="u-drawer__scroll-view" scroll-y="true"> <slot /> </scroll-view> </view> <scroll-view class="u-drawer__scroll-view" scroll-y="true" :scroll-top="scrollTopBox" v-else @scroll="scroll"> <slot /> </scroll-view> <view @tap="close" class="u-close" :class="['u-close--' + closeIconPos]"> <u-icon v-if="mode != 'center' && closeable" :name="closeIcon" :color="closeIconColor" :size="closeIconSize" ></u-icon> </view> </view> </view> </template> <script> import uMask from "../u-mask/u-mask.vue"; import zIndex from '../libs/config/zIndex.js'; /** * popup 弹窗 * @description 弹出层容器,用于展示弹窗、信息提示等内容,支持上、下、左、右和中部弹出。组件只提供容器,内部内容由用户自定义 * @tutorial https://www.uviewui.com/components/popup.html * @property {String} mode 弹出方向(默认left) * @property {Boolean} mask 是否显示遮罩(默认true) * @property {Stringr | Number} length mode=left | 见官网说明(默认auto) * @property {Boolean} zoom 是否开启缩放动画,只在mode为center时有效(默认true) * @property {Boolean} safe-area-inset-bottom 是否开启底部安全区适配(默认false) * @property {Boolean} mask-close-able 点击遮罩是否可以关闭弹出层(默认true) * @property {Object} custom-style 用户自定义样式 * @property {Stringr | Number} negative-top 中部弹出时,往上偏移的值 * @property {Numberr | String} border-radius 弹窗圆角值(默认0) * @property {Numberr | String} z-index 弹出内容的z-index值(默认1075) * @property {Boolean} closeable 是否显示关闭图标(默认false) * @property {String} close-icon 关闭图标的名称,只能uView的内置图标 * @property {String} close-icon-pos 自定义关闭图标位置(默认top-right) * @property {String} close-icon-color 关闭图标的颜色(默认#909399) * @property {Number | String} close-icon-size 关闭图标的大小,单位rpx(默认30) * @event {Function} open 弹出层打开 * @event {Function} close 弹出层收起 * @example <u-popup v-model="show"><view>出淤泥而不染,濯清涟而不妖</view></u-popup> */ export default { components:{ uMask }, name: 'u-popup', props: { // 滚动 scrollTopBox:{ type: Number, default: 0 }, /** * 显示状态 */ show: { type: Boolean, default: false }, /** * 弹出方向,left|right|top|bottom|center */ mode: { type: String, default: 'left' }, /** * 是否显示遮罩 */ mask: { type: Boolean, default: true }, // 抽屉的宽度(mode=left|right),或者高度(mode=top|bottom),单位rpx,或者"auto" // 或者百分比"50%",表示由内容撑开高度或者宽度 length: { type: [Number, String], default: 'auto' }, // 是否开启缩放动画,只在mode=center时有效 zoom: { type: Boolean, default: true }, // 是否开启底部安全区适配,开启的话,会在iPhoneX机型底部添加一定的内边距 safeAreaInsetBottom: { type: Boolean, default: false }, // 是否可以通过点击遮罩进行关闭 maskCloseAble: { type: Boolean, default: true }, // 用户自定义样式 customStyle: { type: Object, default() { return {}; } }, value: { type: Boolean, default: false }, // 此为内部参数,不在文档对外使用,为了解决Picker和keyboard等融合了弹窗的组件 // 对v-model双向绑定多层调用造成报错不能修改props值的问题 popup: { type: Boolean, default: true }, // 显示显示弹窗的圆角,单位rpx borderRadius: { type: [Number, String], default: 0 }, zIndex: { type: [Number, String], default: '' }, // 是否显示关闭图标 closeable: { type: Boolean, default: false }, // 关闭图标的名称,只能uView的内置图标 closeIcon: { type: String, default: 'close' }, // 自定义关闭图标位置,top-left为左上角,top-right为右上角,bottom-left为左下角,bottom-right为右下角 closeIconPos: { type: String, default: 'top-right' }, // 关闭图标的颜色 closeIconColor: { type: String, default: '#909399' }, // 关闭图标的大小,单位rpx closeIconSize: { type: [String, Number], default: '30' }, // 宽度,只对左,右,中部弹出时起作用,单位rpx,或者"auto" // 或者百分比"50%",表示由内容撑开高度或者宽度,优先级高于length参数 width: { type: String, default: '' }, // 高度,只对上,下,中部弹出时起作用,单位rpx,或者"auto" // 或者百分比"50%",表示由内容撑开高度或者宽度,优先级高于length参数 height: { type: String, default: '' }, // 给一个负的margin-top,往上偏移,避免和键盘重合的情况,仅在mode=center时有效 negativeTop: { type: [String, Number], default: 0 }, // 遮罩的样式,一般用于修改遮罩的透明度 maskCustomStyle: { type: Object, default() { return {} } }, // 遮罩打开或收起的动画过渡时间,单位ms duration: { type: [String, Number], default: 250 } }, data() { return { visibleSync: false, showDrawer: false, timer: null, closeFromInner: false, // value的值改变,是发生在内部还是外部 }; }, computed: { // 根据mode的位置,设定其弹窗的宽度(mode = left|right),或者高度(mode = top|bottom) style() { let style = {}; // 如果是左边或者上边弹出时,需要给translate设置为负值,用于隐藏 if (this.mode == 'left' || this.mode == 'right') { style = { width: this.width ? this.getUnitValue(this.width) : this.getUnitValue(this.length), height: '100%', transform: `translate3D(${this.mode == 'left' ? '-100%' : '100%'},0px,0px)` }; } else if (this.mode == 'top' || this.mode == 'bottom') { style = { width: '100%', height: this.height ? this.getUnitValue(this.height) : this.getUnitValue(this.length), transform: `translate3D(0px,${this.mode == 'top' ? '-100%' : '100%'},0px)` }; } style.zIndex = this.uZindex; // 如果用户设置了borderRadius值,添加弹窗的圆角 if (this.borderRadius) { switch (this.mode) { case 'left': style.borderRadius = `0 ${this.borderRadius}rpx ${this.borderRadius}rpx 0`; break; case 'top': style.borderRadius = `0 0 ${this.borderRadius}rpx ${this.borderRadius}rpx`; break; case 'right': style.borderRadius = `${this.borderRadius}rpx 0 0 ${this.borderRadius}rpx`; break; case 'bottom': style.borderRadius = `${this.borderRadius}rpx ${this.borderRadius}rpx 0 0`; break; default: } // 不加可能圆角无效 style.overflow = 'hidden'; } if(this.duration) style.transition = `all ${this.duration / 1000}s linear`; return style; }, // 中部弹窗的特有样式 centerStyle() { let style = {}; style.width = this.width ? this.getUnitValue(this.width) : this.getUnitValue(this.length); // 中部弹出的模式,如果没有设置高度,就用auto值,由内容撑开高度 style.height = this.height ? this.getUnitValue(this.height) : 'auto'; style.zIndex = this.uZindex; style.marginTop = `-${this.$u.addUnit(this.negativeTop)}`; if (this.borderRadius) { style.borderRadius = `${this.borderRadius}rpx`; // 不加可能圆角无效 style.overflow = 'hidden'; } return style; }, // 计算整理后的z-index值 uZindex() { return this.zIndex ? this.zIndex : zIndex.popup; } }, watch: { value(val) { if (val) { this.open(); } else if(!this.closeFromInner) { this.close(); } this.closeFromInner = false; } }, mounted() { // 组件渲染完成时,检查value是否为true,如果是,弹出popup this.value && this.open(); // console.log(this.scrollTopBox) }, methods: { // 判断传入的值,是否带有单位,如果没有,就默认用rpx单位 getUnitValue(val) { if(/(%|px|rpx|auto)$/.test(val)) return val; else return val + 'rpx' }, scroll(e){ // console.log(e.detail.scrollTop) this.$emit('scroll', e.detail.scrollTop); }, // 遮罩被点击 maskClick() { this.close(); }, close() { // 标记关闭是内部发生的,否则修改了value值,导致watch中对value检测,导致再执行一遍close // 造成@close事件触发两次 this.closeFromInner = true; this.change('showDrawer', 'visibleSync', false); }, // 中部弹出时,需要.u-drawer-content将居中内容,此元素会铺满屏幕,点击需要关闭弹窗 // 让其只在mode=center时起作用 modeCenterClose(mode) { if (mode != 'center' || !this.maskCloseAble) return; this.close(); }, open() { this.change('visibleSync', 'showDrawer', true); }, // 此处的原理是,关闭时先通过动画隐藏弹窗和遮罩,再移除整个组件 // 打开时,先渲染组件,延时一定时间再让遮罩和弹窗的动画起作用 change(param1, param2, status) { // 如果this.popup为false,意味着为picker,actionsheet等组件调用了popup组件 if (this.popup == true) { this.$emit('input', status); } this[param1] = status; if(status) { // #ifdef H5 || MP this.timer = setTimeout(() => { this[param2] = status; this.$emit(status ? 'open' : 'close'); }, 50); // #endif // #ifndef H5 || MP this.$nextTick(() => { this[param2] = status; this.$emit(status ? 'open' : 'close'); }) // #endif } else { this.timer = setTimeout(() => { this[param2] = status; this.$emit(status ? 'open' : 'close'); }, this.duration); } } } }; </script> <style scoped lang="scss"> @import "../libs/css/style.components.scss"; .u-drawer { /* #ifndef APP-NVUE */ display: block; /* #endif */ position: fixed; top: 0; left: 0; right: 0; bottom: 0; overflow: hidden; } .u-drawer-content { /* #ifndef APP-NVUE */ display: block; /* #endif */ position: absolute; z-index: 1003; transition: all 0.25s linear; } .u-drawer__scroll-view { width: 100%; height: 100%; } .u-drawer-left { top: 0; bottom: 0; left: 0; background-color: #ffffff; } .u-drawer-right { right: 0; top: 0; bottom: 0; background-color: #ffffff; } .u-drawer-top { top: 0; left: 0; right: 0; background-color: #ffffff; } .u-drawer-bottom { bottom: 0; left: 0; right: 0; background-color: #ffffff; } .u-drawer-center { @include vue-flex; flex-direction: column; bottom: 0; left: 0; right: 0; top: 0; justify-content: center; align-items: center; opacity: 0; z-index: 99999; } .u-mode-center-box { min-width: 100rpx; min-height: 100rpx; /* #ifndef APP-NVUE */ display: block; /* #endif */ position: relative; background-color: #ffffff; } .u-drawer-content-visible.u-drawer-center { transform: scale(1); opacity: 1; } .u-animation-zoom { transform: scale(1.15); } .u-drawer-content-visible { transform: translate3D(0px, 0px, 0px) !important; } .u-close { position: absolute; z-index: 3; } .u-close--top-left { top: 30rpx; left: 30rpx; } .u-close--top-right { top: 30rpx; right: 30rpx; } .u-close--bottom-left { bottom: 30rpx; left: 30rpx; } .u-close--bottom-right { right: 30rpx; bottom: 30rpx; } </style>
u-index-list
组件:
<template> <!-- 支付宝小程序使用$u.getRect()获取组件的根元素尺寸,所以在外面套一个"壳" --> <view> <view class="u-index-bar"> <slot /> <view v-if="showSidebar" class="u-index-bar__sidebar" @touchstart.stop.prevent="onTouchMove" @touchmove.stop.prevent="onTouchMove" @touchend.stop.prevent="onTouchStop" @touchcancel.stop.prevent="onTouchStop"> <view v-for="(item, index) in indexList" :key="index" class="u-index-bar__index" :style="{zIndex: zIndex + 1, color: activeAnchorIndex === index ? activeColor : ''}" :data-index="index"> {{ item }} </view> </view> <view class="u-indexed-list-alert" v-if="touchmove && indexList[touchmoveIndex]" :style="{ zIndex: alertZIndex }"> <text>{{indexList[touchmoveIndex]}}</text> </view> </view> </view> </template> <script> import zIndex from '../libs/config/zIndex.js'; var indexList = function() { var indexList = []; var charCodeOfA = 'A'.charCodeAt(0); for (var i = 0; i < 26; i++) { indexList.push(String.fromCharCode(charCodeOfA + i)); } return indexList; }; /** * indexList 索引列表 * @description 通过折叠面板收纳内容区域,搭配<u-index-anchor>使用 * @tutorial https://www.uviewui.com/components/indexList.html#indexanchor-props * @property {Number String} scroll-top 当前滚动高度,自定义组件无法获得滚动条事件,所以依赖接入方传入 * @property {Array} index-list 索引字符列表,数组(默认A-Z) * @property {Number String} z-index 锚点吸顶时的层级(默认965) * @property {Boolean} sticky 是否开启锚点自动吸顶(默认true) * @property {Number String} offset-top 锚点自动吸顶时与顶部的距离(默认0) * @property {String} highlight-color 锚点和右边索引字符高亮颜色(默认#2979ff) * @event {Function} select 选中右边索引字符时触发 * @example <u-index-list :scrollTop="scrollTop"></u-index-list> */ export default { name: "u-index-list", props: { sticky: { type: Boolean, default: true }, zIndex: { type: [Number, String], default: '' }, scrollTop: { type: [Number, String], default: 0, }, offsetTop: { type: [Number, String], default: 0 }, indexList: { type: Array, default () { return indexList() } }, activeColor: { type: String, default: '#2979ff' } }, created() { // #ifdef H5 this.stickyOffsetTop = this.offsetTop ? uni.upx2px(this.offsetTop) : 44; // #endif // #ifndef H5 this.stickyOffsetTop = this.offsetTop ? uni.upx2px(this.offsetTop) : 0; // #endif // 只能在created生命周期定义children,如果在data定义,会因为循环引用而报错 this.children = []; }, data() { return { activeAnchorIndex: 0, showSidebar: true, // children: [], touchmove: false, touchmoveIndex: 0, } }, watch: { scrollTop() { this.updateData() } }, computed: { // 弹出toast的z-index值 alertZIndex() { return zIndex.toast; } }, methods: { updateData() { this.timer && clearTimeout(this.timer); this.timer = setTimeout(() => { this.showSidebar = !!this.children.length; this.setRect().then(() => { this.onScroll(); }); }, 0); }, setRect() { return Promise.all([ this.setAnchorsRect(), this.setListRect(), this.setSiderbarRect() ]); }, setAnchorsRect() { return Promise.all(this.children.map((anchor, index) => anchor .$uGetRect('.u-index-anchor-wrapper') .then((rect) => { Object.assign(anchor, { height: rect.height, top: rect.top }); }))); }, setListRect() { return this.$uGetRect('.u-index-bar').then((rect) => { Object.assign(this, { height: rect.height, top: rect.top + this.scrollTop }); }); }, setSiderbarRect() { return this.$uGetRect('.u-index-bar__sidebar').then(rect => { this.sidebar = { height: rect.height, top: rect.top }; }); }, getActiveAnchorIndex() { const { children } = this; const { sticky } = this; for (let i = this.children.length - 1; i >= 0; i--) { let itemTop = children[i].top - 100; const preAnchorHeight = i > 0 ? children[i - 1].height : 0; const reachTop = sticky ? preAnchorHeight : 0; // console.log(reachTop) if (reachTop >= itemTop) { return i; } } return -1; }, onScroll() { const { children = [] } = this; if (!children.length) { return; } const { sticky, stickyOffsetTop, zIndex, scrollTop, activeColor } = this; const active = this.getActiveAnchorIndex(); this.activeAnchorIndex = active; if (sticky) { let isActiveAnchorSticky = false; if (active !== -1) { isActiveAnchorSticky = children[active].top - 100 <= 0; } children.forEach((item, index) => { if (index === active) { let wrapperStyle = ''; let anchorStyle = { color: `${activeColor}` }; if (isActiveAnchorSticky) { wrapperStyle = { height: `${children[index].height}px` }; anchorStyle = { position: 'fixed', top: `${stickyOffsetTop}px`, zIndex: `${zIndex ? zIndex : zIndex.indexListSticky}`, color: `${activeColor}` }; } item.active = active; item.wrapperStyle = wrapperStyle; item.anchorStyle = anchorStyle; } else if (index === active - 1) { const currentAnchor = children[index]; const currentOffsetTop = currentAnchor.top; const targetOffsetTop = index === children.length - 1 ? this.top : children[index + 1].top; const parentOffsetHeight = targetOffsetTop - currentOffsetTop; const translateY = parentOffsetHeight - currentAnchor.height; const anchorStyle = { position: 'relative', transform: `translate3d(0, ${translateY}px, 0)`, zIndex: `${zIndex ? zIndex : zIndex.indexListSticky}`, color: `${activeColor}` }; item.active = active; item.anchorStyle = anchorStyle; } else { item.active = false; item.anchorStyle = ''; item.wrapperStyle = ''; } }); } }, onTouchMove(event) { this.touchmove = true; const sidebarLength = this.children.length; const touch = event.touches[0]; const itemHeight = this.sidebar.height / sidebarLength; let clientY = 0; clientY = touch.clientY; let index = Math.floor((clientY - this.sidebar.top) / itemHeight); if (index < 0) { index = 0; } else if (index > sidebarLength - 1) { index = sidebarLength - 1; } this.touchmoveIndex = index; this.scrollToAnchor(index); }, onTouchStop() { this.touchmove = false; this.scrollToAnchorIndex = null; }, scrollToAnchor(index) { if (this.scrollToAnchorIndex === index) { return; } this.scrollToAnchorIndex = index; const anchor = this.children.find((item) => item.index === this.indexList[index]); if (anchor) { this.$emit('select', anchor.top); // uni.pageScrollTo({ // duration: 0, // scrollTop: anchor.top + this.scrollTop // }); } } } }; </script> <style lang="scss" scoped> @import "../libs/css/style.components.scss"; .u-index-bar { margin-top: 45px; position: relative } .u-index-bar__sidebar { position: fixed; top: 304px; right: 0; @include vue-flex; flex-direction: column; text-align: center; transform: translateY(-50%); user-select: none; z-index: 99; background-color: #c8c8c8; font-family: Helvetica; width: 24px; } .u-index-bar__index { font-weight: 500; padding: 8rpx; font-size: 22rpx; line-height: 1; color: hsla(0,0%,100%,.5); } .u-indexed-list-alert { position: fixed; width: 120rpx; height: 120rpx; right: 90rpx; top: 50%; margin-top: -60rpx; border-radius: 24rpx; font-size: 50rpx; color: #fff; background-color: rgba(0, 0, 0, 0.65); @include vue-flex; justify-content: center; align-items: center; padding: 0; z-index: 9999999; } .u-indexed-list-alert text { line-height: 50rpx; } </style>
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