用jQuery模拟select下拉框的简单示例代码

前端技术 2023/09/05 JavaScript

很多时候，美工会觉得默认的select下拉框很难看（特别是右侧的下拉箭头按钮），他们通常喜欢用一个自定义的图标来代替这个按钮。这样就只能用 js + div 来模拟了，倒腾了一番，用jQuery模拟了下，当然网上这种文章也不少，只是懒得去看找

复制代码 代码如下:

<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">
<html xmlns=\"http://www.w3.org/1999/xhtml\">
<head>
    <meta http-equiv=\"Content-Type\" content=\"text/html; charset=gb2312\" />
    <title>自己实现的下拉框</title>
    <style type=\"text/css\" media=\"all\">
        *{font-size:12px;line-height:18px;list-style:none;padding:0;margin:0;text-decoration:none;color:#000;border:0}
        .page{text-align:center;margin:50px;}
        input{border-bottom:solid 1px #ccc;height:18px}             
        .expand{display:none;position:absolute;width:200px;height:100px;overflow-y:auto;border:solid 1px #ccc};
  .expand li{margin:1px 0;background:#fff}
        .expand a{text-decoration:none;display:block;padding:0 5px;background:#efefef;margin:1px 0}
        .expand a:hover{background:#ff9}
    </style>
    <script type=\"text/javascript\" src=\"http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.6.min.js\"></script>
    <script type=\"text/javascript\">

        function showExpand(targetId, expandId, expand_class) {
            //先关掉其它弹出的层
            if (expand_class != undefined) {
                $(\".\" + expand_class).hide();
            }

            //判断是否为IE
            var isIE = (! +[1, ]);

            var expand = $(\"#\" + expandId);
            var target = $(\"#\" + targetId);

            var dx = 0;
            if (isIE) {
                dx = -2;
            }
            else {
                dx = 0;
            }
            expand.get(0).style.left = target.get(0).getBoundingClientRect().left + dx + \"px\";
            if (isIE) {
                dx = 17;
            }
            else {
                dx = 19;
            }
            expand.get(0).style.top = parseInt(target.get(0).getBoundingClientRect().top) + dx + \"px\";
            expand.show();

            //每个li点击时赋值
            $(\"#\" + expandId).find(\"li\").each(function (i) {
                $(this).show().click(function () {
                    target.val($(this).text().split(\' \')[1]);
                    expand.hide();
                })
            })

   
        }
  

        function search(srcId, expandId) {
            var expand = $(\"#\" + expandId);
            var src = $(\"#\" + srcId);

            var A = expand.find(\"a\");
            var v = src.val().toUpperCase();

            A.each(function (i) {
                if (v.length >= 2) {
                    if ($(this).text().toUpperCase().indexOf(v) == -1) {
                        $(this).parent().hide();
                    }
                    else {
                        $(this).parent().show();
                    }
                }
                if (v.length <= 0) {
                    $(this).parent().show();
                }
            })
            src.val(v);
        }


  $().ready(function(){
   $(\"#txt_city\").keyup(function(){
    search(\'txt_city\',\'city_select1\');
   }).focus(function(){
    showExpand(\'txt_city\',\'city_select1\',\'expand\')
   })

   $(\"#txt_city2\").keyup(function(){
    search(\'txt_city2\',\'city_select2\');
   }).focus(function(){
    showExpand(\'txt_city2\',\'city_select2\',\'expand\')
   })
  })

  function fnTest(){
   document.getElementById(\"txtTarget\").value = document.getElementById(\"txtSrc\").value;
  }
    </script>
</head>
<body>
    <div class=\"page\" style=\"text-align: center\">
        <input type=\"text\" value=\"\" id=\"txt_city\" class=\"input_expand\"  /><a
            href=\"#\" onclick=\"showExpand(\'txt_city\',\'city_select1\',\'expand\')\">▼</a>
        <div class=\"expand\" id=\"city_select1\">
            <ul>
                <li><a href=\"javascript:void(0)\">SH 上海</a></li>
                <li><a href=\"javascript:void(0)\">BJ 北京</a></li>
                <li><a href=\"javascript:void(0)\">HZ 杭州</a></li>
                <li><a href=\"javascript:void(0)\">WH 武汉</a></li>
                <li><a href=\"javascript:void(0)\">NJ 南京</a></li>
                <li><a href=\"javascript:void(0)\">WX 无锡</a></li>
            </ul>
        </div>

        <input type=\"text\" value=\"\" id=\"txt_city2\" class=\"input_expand\"  /><a
            href=\"#\" onclick=\"showExpand(\'txt_city2\',\'city_select2\',\'expand\')\">▼</a>
        <div class=\"expand\" id=\"city_select2\">
            <ul>
                <li><a href=\"javascript:void(0)\">CN 中文</a></li>
                <li><a href=\"javascript:void(0)\">EN 英语</a></li>
                <li><a href=\"javascript:void(0)\">JP 日本</a></li>
                <li><a href=\"javascript:void(0)\">RA 俄语</a></li>
                <li><a href=\"javascript:void(0)\">FA 法语</a></li>
                <li><a href=\"javascript:void(0)\">00 其它</a></li>
            </ul>
        </div>

  <br/>
  <br/>
  <input type=\"text\" id=\"txtSrc\" onkeyup=\"fnTest()\" />
  <br/>
  <input type=\"text\" id=\"txtTarget\" />
    </div>
</body>
</html>

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