vue+element ui實現錨點定位
阿新 • • 發佈：2021-06-30
本文例項為大家分享了 + element ui 實現錨點定位的具體程式碼，供大家參考，具體內容如下
vue
<el-row :gutter="20">
<el-col :span="3">
<!--導航選擇事件-->
<el-menu :default-active="activeStep" @select="jump">
<el-menu-item v-for="(item,index) in menuData" :index="`${index}`" :key="item.subjectId">
<i class="el-icon-menu"></i>
<span slot="title">{{item.subjectName}}</span>
</el-menu-item>
</el-menu>
</el-col>
<!--繫結scroll事件需要監聽-->
<el-col :span="21" class="scroll_cls" @scroll="onScroll">
<div v-for="(item,index) in tableObject" :key="index" style="height:500px">
<div class="title scroll-item" :id="item.name">{{item.name}}</div>
<el-table :data="item.rows" :key="index">
<el-table-column label="序號" type="index" width="50"></el-table-column>
<el-table-column prop="channelId" lab
// 滾動觸發按鈕高亮
methods: {
onScroll(e) {
let scrollItems = document.querySelectorAll(".scroll-item");
console.log(scrollItems)
console.log(e)
for (let i = scrollItems.length - 1; i >= 0; i--) {
// 判斷滾動條滾動距離是否大於當前滾動項可滾動距離
let judge =
e.target.scrollTop >=
scrollItems[i].offsetTop - scrollItems[0].offsetTop;
if (judge) {
console.log(i)
this.activeStep = i.toString();
break;
}
}
},jump(index) {
console.log(index)
let target = document.querySelector(".scroll_cls");
let scrollItems = document.querySelectorAll(".scroll-item");
// 判斷滾動條是否滾動到底部
if (target.scrollHeight <= target.scrollTop + target.clientHeight) {
console.log(index)
console.log(typeof index)
this.activeStep = index;
}
let total = scrollItems[index].offsetTop - scrollItems[0].offsetTop; // 錨點元素距離其offsetParent(這裡是body)頂部的距離(待滾動的距離)
console.log(total)
let distance = document.querySelector(".scroll_cls").scrollTop; // 滾動條距離滾動區域頂部的距離
console.log(distance)
// let distance = document.body.scrollTop || document.documentElement.scrollTop || window.pageYOffset // 滾動條距離滾動區域頂部的距離(滾動區域為視窗)
// 滾動動畫實現,使用setTimeout的遞迴實現平滑滾動，將距離細分為50小段，10ms滾動一次
// 計算每一小段的距離
let step = total / 50;
if (total > distance) {
smoothDown(document.querySelector(".scroll_cls"));
} else {
let newTotal = distance - total;
step = newTotal / 50;
smoothUp(document.querySelector(".scroll_cls"));
}
// 引數element為滾動區域
function smoothDown(element) {
if (distance < total) {
distance += step;
element.scrollTop = distance;
setTimeout(smoothDown.bind(this,element),10);
} else {
element.scrollTop = total;
}
}
// 引數element為滾動區域
function smoothUp(element) {
if (distance > total) {
distance -= step;
element.scrollTop = distance;
setTimeout(smoothUp.bind(this,10);
} else {
element.scrollTop = total;
}
}
document.querySelectorAll('.scroll-item'www.cppcns.com).forEach((item,index1) => {
if (index === index1) {
item.scrollIntoView({
block: 'start',behavior: 'smooth'
})
}
})
},},mounted() {
this.$nextTick(() => {
console.log(1)
window.addEventListener('scroll',this.onScroll,true)
})
},
.scroll_cls {
height: 500px;
overflow: auto;
}
轉載自：原文連結點選這裡
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。