利用jquery怎样做一个搜索历史的功能？-群英

上一篇：JavaScript防篡改对象怎样使用？下一篇：JS运算符怎样使用？浅谈几个JS运算符的使用技巧

现在很多网站都有搜索的功能，而经常搜索访问的朋友应该会注意的，再次搜索的时候会有搜索历史的显示，那么这样效果是怎样做的呢？本文就给大家介绍一下利用jquery插件怎样做一个搜索历史的功能。

效果如下

代码部分

<!DOCTYPE html>
<html>
 <head>
  <meta charset="utf-8">
  <title>做搜索历史</title>
  <script src="js/jquery-3.4.1.min.js"></script>
  <style>
   *{
    margin: 0px;
    padding: 0px;
   }
   #searchbox{
    /* border: 1px solid lightgray; */
    height: 40px;
    width: 720px;
    position: relative;
   }
   #searchinput{
    border: 1px solid lightgray;
    border-radius: 5px 0px 0px 5px;
    height: 28px;
    position: absolute;
    right: 45px;
    top: 5px;
    left: 5px;
    width: 670px;
    outline: none;
    text-indent: 12px;
    font-size: 12px;
    color: gray;
   }
   #searchinput:focus{
    border-color: rgb(252,25,68);
   }
   #searchinput:focus~#morebox{
    display:flex;
   }
   #searchbtn{
    height: 30px;
    width: 40px;
    border: none;
    border-radius: 0px 5px 5px 0px;
    background-color: rgb(252,25,68);
    position: absolute;
    right: 5px;
    top: 5px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
   }
   #searchbtn img{
    width: 25px;
    height: 25px;
   }
   #morebox{
    border: 1px solid lightgray;
    position: absolute;
    top: 40px;
    left: 5px;
    right: 5px;
    height: 370px;
    z-index: 7;
    border-radius: 2px;
    display: flex;
    display: none;
   }
   #push{
    flex: 1;
    /* border: 1px solid lightgray; */
    position: relative;
   }
   #history{
    /* display: none; */
    flex: 1;
    /* border: 1px solid lightgray; */
    position: relative;
   }
   .head{
    position: absolute;
    top: 0px;
    width: 100%;
    height: 30px;
    border-bottom: 1px solid lightgray;
    font-size: 12px;
    display: flex;
    align-items: center;
    text-indent: 12px;
    color: rgb(252,85,49);
   }
   .main{
    position: absolute;
    top: 30px;
    width: 100%;
    bottom: 0px;
    overflow-x:hidden;
    overflow-y: auto;
   }
   .item{
    font-size: 12px;
    height: 30px;
    display: flex;
    align-items: center;
    text-indent: 12px;
    cursor: pointer;
   }
   .item:hover{
    background-color: lightgray;
   }
  </style>
 </head>
 <body>
  <div id="searchbox">
   <input id="searchinput" placeholder="c一下" />
   <button id="searchbtn"><img src="img/sc.png"></button>
   <div id="morebox">
    <div id="history">
     <div class="head">搜索历史</div>
     <div class="main"></div>
    </div>
    <div id="push">
     <div class="head">热门推荐</div>
     <div class="main">
      <div class="item">微软终于对JDK下手了</div>
      <div class="item">小米隔空充电技术</div>
      <div class="item">Linux常用命令大全</div>
      <div class="item">阿飞超努力又水文了</div>
      <div class="item">每天学一个jquery插件竟然没有插件！究竟是道德的沦丧，还是人性的扭曲</div>
     </div>
    </div>
   </div>
  </div>
 </body>
</html>
<script>
 $(document).ready(function(){
  //每次点击搜索就假如缓存之中
  //
  $(".item").click(function(){
   var str = $(this).text();
   $("#searchinput").val(str)
  })
   // localStorage["history"] = '[]'//清除一下缓存;
  drawhistory();
  $("#searchbtn").click(function(){
   var str = $("#searchinput").val();
   if(str&&str!=""){
    var arr = getSession();
    arr.push(str);
    localStorage["history"] = JSON.stringify(arr);
    drawhistory();
   }
  })
  getSession();
  //根据缓存找到历史，然后生成搜索历史
  function drawhistory(){
   var arr = getSession();
   $("#history .main .item").remove();
   arr.forEach(item=>{
    var $item = $("<div class='item'>"+item+"</div>");
    $item.appendTo($("#history .main"));
   })
  }
  //获得缓存
  function getSession(){
   var ses = localStorage["history"];
   var arr = ses==undefined?[]:JSON.parse(ses);
   return arr;
  }
 })
</script>