Vue uses native js to achieve scrolling page tracking and navigation highlighting

• Need to use vue to make a special page.
• Scroll the page to highlight the specified area.

Monitor the scrolling page event and compare the current page position with the element position. If the current scrolling area position is greater than the element position, add a class to the navigation and remove the class to switch the style.

The method I use is to add an id to the positioning element, add a data-id attribute to the navigation, listen for scroll events, and if the current scrolling area is larger than the positioning element area, assign the element's id to a variable and then match the navigation's data-id , Switch class.

html structure

main.vue

<template>
  <div class="qz-home">
    <div class="quiz-container">
      <div class="quiz-ad-pic" id="pagetop"></div>
      <div class="quiz-main">
        <div class="quiz-main-inside" id="js-content">
          <quiz-sessions class="item" id="quizhall"></quiz-sessions>
          <quizRecords class="item" id="quizrecord"></quizRecords>
          <quiz-history class="item" id="quizHistory"></quiz-history>
          <quiz-mine class="item" id="quizMine"></quiz-mine>
          <quiz-rank class="item" id="quizRank"></quiz-rank>
          <quiz-rule class="item" id="quizRule"></quiz-rule>
        </div>
      </div>
      <navigation id="js-nav"></navigation>
    </div>
  </div>
</template>

navigation.vue

<template>
  <nav class="nav-container">
    <div class="nav-mark"></div>
    <div class="nav-main">
      <ul class="nav-list">
        <li :class="{'cur': curindex === index}" v-for="(item, index) in navList" :key="index" :data-id="item.id"><a @click="linkTo(item.id, index)">{{item.name}}</a></li>
      </ul>
      <div class="backtop" @click="backTop()">
        <a></a>
      </div>
    </div>
  </nav>
</template>

javascript

export default {
  name: "Navigation",
  data() {
    return {
      navList: [
        { name: "竞猜大厅", id: "quizhall" },
        { name: "竞猜记录", id: "quizrecord" },
        { name: "历史赛事", id: "quizHistory" },
        { name: "我的竞猜", id: "quizMine" },
        { name: "排行榜", id: "quizRank" },
        { name: "玩法", id: "quizRule" }
      ],
      curindex: 0
    };
  },
  mounted() {
    this.initScroll();
  },
  methods: {
    initScroll() {
      let _this = this;
      // 监听页面滚动事件
      window.addEventListener('scroll', function() {
        var removeClass = function(obj, cls) {
          if (obj.className == cls) {
            obj.className = "";
          }
        }
        var addClass = function(obj, cls) {
          if (obj.className != cls) {
            obj.className = cls;
          }
        }

        let pos = document.documentElement.scrollTop;
        if (pos > 300) {
          _this.isVisibleNav = true;
        } else {
          _this.isVisibleNav = false;
        }
        // 获取全部导航dom与元素dom
        var navList = document.querySelector("#js-nav").querySelectorAll("li");
        var items = document.querySelector("#js-content").querySelectorAll(".item");
        // 滚动后遍历元素，如果页面滚动位置大于元素的位置，赋值给变量
        var currentId = "";
        for (var i = 0; i < items.length; i++) {
          var _item = items[i];
          var _itemTop = _item.offsetTop;
          if (pos > _itemTop - 200) {
            currentId = _item.id;
          } else {
            break;
          }
        }
        // 如果已赋值了变量，进行匹配，如果匹配则添加class其他删除
        if (currentId) {
          for (var j = 0; j < navList.length; j++) {
            var _navItem = navList[j];
            var _navId = _navItem.getAttribute('data-id');
            if (_navId != currentId) {
              removeClass(_navItem, "cur");
            } else {
              addClass(_navItem, "cur");
            }
          }
        }
      })
    }
  }
};

Reference article address

This article is reproduced in: Ape 2048 → https://www.mk2048.com/blog/blog.php?id=h0j2jc0b2ab