Vue 实现展开折叠效果的示例代码

本文介绍了Vue 实现展开折叠效果的示例代码，分享给大家，具体如下：

效果如见：

1.html代码

<!DOCTYPE html>
<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title>js文本段落展开和收拢效果</title>
  <script type="text/javascript" src="https://www.jb51.net/ajaxjs/jquery-1.6.2.min.js"></script>
</head>
<body>
  <div id="container">
 <div id="wrap">
 <div>
    <h1>这一段文字是可以折叠展开的，点击下面的“更多”就可以展开，点击下面的“折叠”就可以折叠</h1>
 </div>
 </div>
 <div id="read-more"></div>
  </div>
</body>
 </html>

2.js代码，最关键的

$(function() {
 var slideHeight = 45; // px 定义折叠的最小高度
 var defHeight = $('#wrap').height();
 if(defHeight >= slideHeight) {
 $('#wrap').css('height', slideHeight + 'px');
 $('#read-more').append('<a href="#" rel="external nofollow" >更多</a>');
 $('#read-more a').click(function() {
  var curHeight = $('#wrap').height();
  if(curHeight == slideHeight) {
  $('#wrap').animate({
   height: defHeight
  }, "normal");
  $('#read-more a').html('折叠');
  } else {
  $('#wrap').animate({
   height: slideHeight
  }, "normal");
  $('#read-more a').html('更多');
  }
  return false;
 });
 }
});

3.css代码

#container {
 margin: 0 auto;
 width: 600px;
 border: 1px solid #3bb2d0;
}

#wrap {
 position: relative;
 padding: 10px;
 overflow: hidden;
}

#read-more {
 padding: 5px;
 background: #fff;
 color: #333;
}

#read-more a {
 padding-right: 22px;
 no-repeat 100% 50%;
 font-weight: bold;
 text-decoration: none;
}

#read-more a: hover {
 color: #000;
}

除了使用jQuery的方式实现上述效果，同样可以在Vue实现，下面是解决办法：

1、创建collapse.js文件

const elTransition =
 "0.3s height ease-in-out, 0.3s padding-top ease-in-out, 0.3s padding-bottom ease-in-out";
const Transition = {
 "before-enter"(el) {
  el.style.transition = elTransition;
  if (!el.dataset) el.dataset = {};

  el.dataset.oldPaddingTop = el.style.paddingTop;
  el.dataset.oldPaddingBottom = el.style.paddingBottom;

  el.style.height = 0;
  el.style.paddingTop = 0;
  el.style.paddingBottom = 0;
 },

 enter(el) {
  el.dataset.oldOverflow = el.style.overflow;
  if (el.scrollHeight !== 0) {
   el.style.height = el.scrollHeight + "px";
   el.style.paddingTop = el.dataset.oldPaddingTop;
   el.style.paddingBottom = el.dataset.oldPaddingBottom;
  } else {
   el.style.height = "";
   el.style.paddingTop = el.dataset.oldPaddingTop;
   el.style.paddingBottom = el.dataset.oldPaddingBottom;
  }

  el.style.overflow = "hidden";
 },

 "after-enter"(el) {
  el.style.transition = "";
  el.style.height = "";
  el.style.overflow = el.dataset.oldOverflow;
 },

 "before-leave"(el) {
  if (!el.dataset) el.dataset = {};
  el.dataset.oldPaddingTop = el.style.paddingTop;
  el.dataset.oldPaddingBottom = el.style.paddingBottom;
  el.dataset.oldOverflow = el.style.overflow;

  el.style.height = el.scrollHeight + "px";
  el.style.overflow = "hidden";
 },

 leave(el) {
  if (el.scrollHeight !== 0) {
   el.style.transition = elTransition;
   el.style.height = 0;
   el.style.paddingTop = 0;
   el.style.paddingBottom = 0;
  }
 },

 "after-leave"(el) {
  el.style.transition = "";
  el.style.height = "";
  el.style.overflow = el.dataset.oldOverflow;
  el.style.paddingTop = el.dataset.oldPaddingTop;
  el.style.paddingBottom = el.dataset.oldPaddingBottom;
 }
};

export default {
 name: "collapseTransition",
 functional: true,
 render(h, { children }) {
  const data = {
   on: Transition
  };
  return h("transition", data, children);
 }
};

2、在.vue组件中引入

<template>
  <div class="container">
    <button @click="isActive = !isActive">展开/折叠</button>
    <collapse>
      <div class="container" v-show="isActive">
        <h2>欢迎大家品尝Pizza!</h2>
        <h5>这里有你非常喜欢的Pizza!</h5>
      </div>
    </collapse>
  </div>
</template>
<script>
import collapse from "../assets/js/collapse.js";
export default {
 data() {
  return {
   isActive: false
  };
 },
 components: {
  collapse
 }
};
</script>

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