效果圖話不多說,先上效果圖
因?yàn)槭鞘褂玫氖謾C(jī)錄屏,視頻格式為MP4,上傳到文章時(shí)發(fā)現(xiàn)只支持圖片,還好電腦自動(dòng)錄屏功能,所以簡(jiǎn)單的錄制了一下,完后又提示只能4M,只能再去壓縮圖片,所以畫質(zhì)略渣,各位客官講究的看看吧。 特色功能介紹
實(shí)現(xiàn)基礎(chǔ)
說到滾動(dòng)當(dāng)然少不了小程序的基礎(chǔ)組件scroll-view,該組件就是在此基礎(chǔ)上實(shí)現(xiàn)的; Wxml
<scroll-view scroll-y style="height:100%;white-space:nowrap;" scroll-into-view="{{toView}}" enable-back-to-top bindscroll="scroll" scroll-with-animation scroll-top="{{scrollTop}}"> <view class="list-group" wx:for="{{logs}}" wx:for-item="group"> <view class="title" id="{{group.title}}">{{group.title}}</view> <block wx:for="{{group.items}}" wx:for-item="user"> <view id="" class="list-group-item"> <image class="icon" src="{{user.avatar}}" lazy-load="true"></image> <text class="log-item">{{user.name}}</text> </view> </block> </view> </scroll-view>
簡(jiǎn)單說一下上述代碼:根據(jù)小程序文檔,在使用scroll-view組件用于豎向滾動(dòng)時(shí)一定要設(shè)置高度,你們可以看到我在代碼中設(shè)置了'height:100%;'這就實(shí)現(xiàn)了組件的滾動(dòng)高度是整個(gè)頁面。 2.側(cè)邊字母導(dǎo)航 <view class="list-shortcut"> <block wx:for="{{logs}}"> <text class="{{currentIndex===index?'current':''}}" data-id="{{item.title}}" bindtap='scrollToview'>{{item.title}}</text> </block> </view> 3.固定在頂部的字母導(dǎo)航 仔細(xì)的同學(xué)能發(fā)現(xiàn)在滾動(dòng)時(shí),頂部有一個(gè)固定位置的字母導(dǎo)航,其值對(duì)應(yīng)滾動(dòng)到的區(qū)域 <view class="list-fixed {{fixedTitle=='' ? 'hide':''}}" style="transform:translate3d(0,{{fixedTop}}px,0);"> <view class="fixed-title"> {{fixedTitle}} </view> </view> Wxss樣式太簡(jiǎn)單了,就不發(fā)了,重點(diǎn)看js部分
js
normalizeSinger(list) { //歌手列表渲染 let map = { hot: { title: this.data.HOT_NAME, items: [] } } list.forEach((item, index) => { if (index < this.data.HOT_SINGER_LEN) { map.hot.items.push({ name: item.Fsinger_name, avatar:this.constructor(item.Fsinger_mid) }) } const key = item.Findex if (!map[key]) { map[key] = { title: key, items: [] } } map[key].items.push({ name: item.Fsinger_name, avatar: this.constructor(item.Fsinger_mid) }) }) let ret = [] let hot = [] for (let key in map) { let val = map[key] if (val.title.match(/[a-zA-Z]/)) { ret.push(val) } else if (val.title === this.data.HOT_NAME) { hot.push(val) } } ret.sort((a, b) => { return a.title.charCodeAt(0) - b.title.charCodeAt(0) }) return hot.concat(ret) }, 將用戶數(shù)據(jù)分為兩大塊,即熱門組和不熱門組默認(rèn)將參數(shù)的前10組歸類為熱門組,然后對(duì)所以參數(shù)安裝首字母進(jìn)行排序分組。
var lHeight = [], that = this; let height = 0; lHeight.push(height); var query = wx.createSelectorQuery(); query.selectAll('.list-group').boundingClientRect(function(rects){ var rect = rects, len = rect.length; for (let i = 0; i < len; i++) { height += rect[i].height; lHeight.push(height) } }).exec(); var calHeight = setInterval(function(){ if (lHeight != [0]) { that.setData({ listHeight: lHeight }); clearInterval(calHeight); } },1000)
在獲取元素屬性上,小程序提供了一個(gè)很方便的api,wx.createSelectotQuery();具體使用方法請(qǐng)看節(jié)點(diǎn)信息API const listHeight = this.data.listHeight // 當(dāng)滾動(dòng)到頂部,scrollY<0 if (scrollY == 0 || scrollY < 0) { this.setData({ currentIndex:0, fixedTitle:'' }) return } // 在中間部分滾動(dòng) for (let i = 0; i < listHeight.length - 1; i++) { let height1 = listHeight[i] let height2 = listHeight[i + 1] if (scrollY >= height1 && scrollY < height2) { this.setData({ currentIndex:i, fixedTitle:this.data.logs[i].title }) this.fixedTt(height2 - newY); return } } // 當(dāng)滾動(dòng)到底部,且-scrollY大于最后一個(gè)元素的上限 this.setData({ currentIndex: listHeight.length - 2, fixedTitle: this.data.logs[listHeight.length - 2].title }) 參數(shù)格式list:[ { "index": "X", "name": "薛之謙", }, { "index": "Z", "name": "周杰倫", }, { "index": "B", "name": "BIGBANG (??)", }, { "index": "B", "name": "陳奕迅", }, { "index": "L", "name": "林俊杰", }, { "index": "A", "name": "Alan Walker (艾倫·沃克)", }, ] 如果你們還需要其他的參數(shù),對(duì)應(yīng)的在后面加上即可。 END |
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