有一个总的下拉先择框 Name 里面有1,2,3,三个值,选中值为1的时候,名字为"name1"的下拉框可以选择,"name2"和"name3"这两个选 择框变灰,同样的,"Name"再重新选中值为2的时候,"name2"又可以重新选择,其他两个不能再选 择,同样3也是如此。
Name.value=1,name1.disabled=false,name2.disabled=true,name3.disabled=true;
页面不刷新,再重新选择Name时:
Name.value=2,name2.disabled=false,name1.disabled=true,name3.disabled=true;
同样的:
Name.value=3,name3.disabled=false,name2.disabled=true,name2.disabled=true;<select name="Name" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name1" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name2" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name3" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
Name.value=1,name1.disabled=false,name2.disabled=true,name3.disabled=true;
页面不刷新,再重新选择Name时:
Name.value=2,name2.disabled=false,name1.disabled=true,name3.disabled=true;
同样的:
Name.value=3,name3.disabled=false,name2.disabled=true,name2.disabled=true;<select name="Name" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name1" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name2" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name3" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
window.onload = function() {
var obj = document.getElementsByTagName('select');
obj[0].onchange = function() {
var val = this.value;
for(var i = 1; i < obj.length; i ++) {
if (obj[i].name == 'name' + val) obj[i].disabled = false;
else obj[i].disabled = true;
}
}
}
</script>
</head><body>
<select name="Name">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name2" disabled="disabled">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name3" disabled="disabled">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<form name="f">
<select name="Name" >
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name1" disabled>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name2" disabled>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name3" disabled>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</form>
<script>
document.f.Name.onclick = function(){
var value = this[this.selectedIndex].value;
if(value == 1){
document.f.name1.disabled = '';
document.f.name2.disabled = 'disabled';
document.f.name3.disabled = 'disabled';
}else if(value == 2){
document.f.name2.disabled = '';
document.f.name1.disabled = 'disabled';
document.f.name3.disabled = 'disabled';
}else if(value == 3){
document.f.name3.disabled = '';
document.f.name1.disabled = 'disabled';
document.f.name2.disabled = 'disabled';
}
};
</script>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
window.onload = function() {
var obj = document.getElementsByTagName('select');
var val = obj[0].value;
for(var i = 1; i < obj.length; i ++) if (obj[i].name == 'name' + val) obj[i].disabled = true;
obj[0].onchange = function() {
var val = this.value;
for(var i = 1; i < obj.length; i ++) {
if (obj[i].name != 'name' + val) obj[i].disabled = false;
else obj[i].disabled = true;
}
}
}
</script>
</head><body>
<select name="Name">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name1">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name2">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
<select name="name3">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</body>
</html>