mpvue实现左侧导航与右侧内容的联动
时间：2021-03-02 11:44:49|栏目：vue|点击： 次
本文实例为大家分享了mpvue左侧导航与右侧内容联动的具体代码，供大家参考，具体内容如下
效果图如下：
（1）左侧导航联动右侧内容
实现：点击左侧导航，右侧内容滑到对应的位置，并且导航上有current当前样式。
mpvue用的还是微信小程序提供的组件scroll-view，它里面有一个属性scroll-into-view，值为某子元素的id，滚动到该元素。
template:
<scroll-view class="menu-wrapper" scroll-y>
<ul>
<li class="menu-item"
v-for="(item,index) in goods"
:class="index===currentIndex ? 'current' : ''"
:key="index"
@tap="selectMenu(index)">
{{item.name}}
</li>
</ul>
</scroll-view>
<scroll-view scroll-y
:scroll-into-view="contentId"
scroll-with-animation="true"
class="foods-wrapper">
<ul>
<li v-for="(item,i) in goods"
:id="'con_'+i"
class="food-list food-list-hook" :key="i">
</li>
</ul>
<scroll-view>
js:
data() {
return {
goods: [],
contentId: '', // 每个food-list的id，scroll-into-view滚动到对应的id
currentIndex: 0
}
},
methods: {
selectMenu(index) {
this.contentId = `con_${index}`
this.currentIndex = index
}
}
（2）在左侧导航联动右侧内容的基础上增加右侧内容联动左侧导航
实现：滑动右侧内容区域，给左侧对应导航增加current样式，并且当导航高度过长，会联动其滚动
补充：contentHeight是右侧内容scroll-view的高度，同时也是左侧导航scroll-view的高度，navItemHeight是导航ul下每一个item的高度，当导航下ul的高度超过scroll-view的高度，并且this.currentIndex * this.navItemHeight > this.contentHeight，导航才向上滚动。
tempate:
<scroll-view class="menu-wrapper"
:scroll-into-view="navId"
scroll-with-animation="true"
scroll-y>
<ul class="menu-ul">
<li class="menu-item"
v-for="(item,index) in goods"
:id="'nav_'+index"
:class="index===currentIndex ? 'current' : ''"
:key="index"
@tap="selectMenu(index)">
{{item.name}}
</li>
</ul>
</scroll-view>
<scroll-view scroll-y
@scroll="onScroll"
:scroll-into-view="contentId"
scroll-with-animation="true"
class="foods-wrapper">
<ul>
<li v-for="(item,i) in goods"
:id="'con_'+i"
class="food-list food-list-hook" :key="i">
</li>
</ul>
</scroll-view>
js:
export default{
data() {
return {
goods: [],
contentId: '', // 每个food-list的id，scroll-into-view滚动到对应的id
navId: '', // 导航模块对应的id，用来联动内容区域
currentIndex: 0,
navulHeight: 0, // 导航里ul高度
navItemHeight: 0, // 每个导航高度
listHeight: [], // foods内部块的高度
contentHeight: [], // 内容区域scroll-view高度
}
},
watch: {
currentIndex() {
console.log(this.currentIndex)
if (this.contentHeight < this.navulHeight) {
let h = this.currentIndex * this.navItemHeight
if (h > this.contentHeight) {
// 导航滑动
this.navId = `nav_${this.currentIndex}`
} else {
this.navId = 'nav_0'
}
}
}
},
methods: {
selectMenu(index) {
this.contentId = `con_${index}`
this.navId = `nav_${index}`
this.currentIndex = index
},
onScroll(e) {
this.contentId = ''
let scrollTop = e.target.scrollTop
// console.log(scrollTop)
let length = this.listHeight.length
if (scrollTop >= this.listHeight[length - 1] - this.contentHeight) {
return
} else if (scrollTop > 0 && scrollTop < this.listHeight[0]) {
this.currentIndex = 0
}
for (let i = 0; i < length; i++) {
if (scrollTop >= this.listHeight[i - 1] && scrollTop < this.listHeight[i]) {
this.currentIndex = i
}
}
// console.log(this.currentIndex)
},
getFoodHeight() {
var query = wx.createSelectorQuery()
let h = 0
query.selectAll('.food-list-hook').boundingClientRect((rects) => {
// console.log(rects)
rects.forEach((rect) => {
h += rect.height
this.listHeight.push(h)
})
// console.log(this.listHeight)
})
query.select('.foods-wrapper').boundingClientRect((rect) => {
this.contentHeight = rect.height
})
query.select('.menu-ul').boundingClientRect((rect) => {
this.navulHeight = rect.height
})
query.select('.menu-item').boundingClientRect((rect) => {
this.navItemHeight = rect.height
}).exec()
}
}，
watch: {
goods() {
// 获取模块高度，即food-list
setTimeout(() => {
this.getFoodHeight()
}, 60)
}
}
}
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