类似input框内最右边添加图标，有清空功能

时间：2021-08-14 23:49:14
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>

<!-- js引入 -->
<script type="text/javascript" src="../js/jquery-1.10.2.js" ></script>
<link href="bootstrap.css" rel="stylesheet">
<style type="text/css">

.round {   /*大span*/
    background: #fff none repeat scroll  ;
    border: 1px solid #bbb;
    display: inline-block;
    height: 28px;
    margin-right: 2px;
    vertical-align: top;
    width: 175px;
    position: relative;
}
.delquery {   /*清除图标*/
    background-position:  -320px;
    cursor: pointer;
    height: 20px;
    margin: 4px 0px  ;
    position: absolute;
    right: ;
    top: ;
    width: 20px;
}
.input_key { /*input框*/
    background: #fff none repeat scroll  ;
    border:  none;
    border-radius: ;
    font: 16px/22px arial;
    height: 18px;
    margin: 5px   5px;
    outline:  none;
    padding: ;
    width: 140px;
    background-repeat: no-repeat;
}
</style>
</head>
<body>
<h1>监听_input值的变化</h1>

<table>
    <tr>
        <td>
            <input type="text"/>
        </td>
    </tr>
    <tr>
        <td>
<span class="round" id="suggest-align">
        <input type=" name="q" id="keyword">
         <span title="清空" class="delquery" id="clear" style="display: none;">x</span>
</span>
        </td>
    </tr>
</table>

</body>

<script type="text/javascript">
$(function(){
$("#clear").click(function(){
    $(".input_key").val("");
    $(".input_key").focus();
    $(this).hide();
})
/* var tValue;
setInterval(function(){
       if(tValue !=$("#keyword").val()){ //这里写自己的业务逻辑代码
           if ($(".input_key").val().trim()!="") {
                $("#clear").show();
            }
         tValue =$("#keyword").val();
       }
},100); */
var tValue;
$("#keyword").keydown(function(){
         if ($(".input_key").val().trim()!="") {
              $("#clear").show();
          }
});
$("#keyword").keyup(function(){
         if ($(".input_key").val().trim()!="") {
              $("#clear").show();
          }
});

})

</script>
</html>

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