我有 2 个组合框,“combo1”和“combo2”,
如果我在 combo1 中选择任何值,我需要在 combo2 中使用与 JavaScript“选择”相同的值。应将哪些 JavaScript 代码添加到下面的 HTML 中才能使其正常工作?
<html>
<head>
<title>combo</title>
</head>
<body>
<form name="testForm" action="" method="post">
<select name="combo1">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
</select><br /><br />
<select name="combo2">
<option value="1">option 1</option>
<option value="2">option 2</option>
<option value="3">option 3</option>
</select>
</form>
</body>
</html>
最佳答案
<script type='text/javascript'>
window.onload = function() { BindEvent(); }
function BindEvent()
{
var elemToBind = document.getElementById ( "cmb1" );
elemToBind.onchange = function () { SetSel ( this ); }
}
function SetSel(elem)
{
var secondCombo = document.getElementById ( "cmb2" );
secondCombo.value = elem.value;
}
</script>
<body>
<select id="cmb1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
<select id="cmb2">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</select>
</body>
关于javascript - 如何使用 JavaScript 更改组合框中的 "selected"值?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/1778184/