JS实现下拉框联动步骤详解

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这次给大家带来JS实现下拉框联动步骤详解,JS实现下拉框联动的注意事项有哪些,下面就是实战案例,一起来看一下。

<!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=utf-8" />
<title> JS下拉联动</title>
<script>
function setSecond(obj){
  var val = obj.value;
  if(val == 'en'){
    var sec = document.getElementById('second');
    sec.innerHTML = "<option>one</option><option>two</option>";
  }else{
    var sec = document.getElementById('second');
    sec.innerHTML = "<option>一</option><option>二</option>";
  }
}
</script>
</head>
<body>
<p>
  <select id="first" onchange="setSecond(this)">
    <option value="en">en</option>
    <option value="zh">zh</option>
  </select>
</p>
<p>
  <select id="second">
  </select>
</p>
</body>
</html>

使用innerHTML,IE浏览器不支持这种方法的,所以改进方法:

<!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=utf-8" />
<title>JS下拉联动</title>
<script>
function setSecond(obj){
  var val = obj.value;
  if(val == 'en'){
    var sec = document.getElementById('second');
    sec.options[0] = new Option("one","one");
    sec.options[1] = new Option("two","two");
  }else{
    var sec = document.getElementById('second');
    sec.options[0] = new Option("一","one");
    sec.options[1] = new Option("二","two");//可设置循环配置,也可一个一个配置
  }
}
</script>
</head>
<body>
<p>
  <select id="first" onchange="setSecond(this)">
    <option value="en">en</option>
    <option value="zh">zh</option>
  </select>
</p>
<p>
  <select id="second">
  </select>
</p>
</body>
</html>

可以兼容火狐,IE等

相信看了本文案例你已经掌握了方法,更多精彩请关注php中文网其它相关文章!

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以上就是JS实现下拉框联动步骤详解的详细内容,更多请关注php中文网其它相关文章!

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