我有两个选择下拉列表:
<select name="internal_message">
<option value="yes">Yes</option>
<option value="" selected="selected">No</option>
</select>
和
<select name="internal_message_agent">
<option value="">Choose</option>.... etc
</select>
我试过了:
<select name="internal_message">
<option value="yes" onClick="document.getElementById('internal_message_agent').disabled=!this.selected;">Yes</option>
<option value="" selected="selected">No</option>
</select>
但它不起作用 - 如何在internal_message选定值为"No"
时禁用internal_message_agent select元素,并在所选选项为"Yes"
答案 0 :(得分:4)
为每个选择添加ID并使用jquery将其禁用,如下所示:
$('#box1').on('change', function(){
if($(this).val()==='no'){
$('#box2').attr('disabled', 'disabled');
}else{
$('#box2').attr('disabled', false);
}
});
答案 1 :(得分:0)
这是Javascript和HTML的样子。
<!DOCTYPE html>
<html>
<head>
</head>
<script>
function validate(){
var b1 = document.getElementById("box1");
var f = b1.options[b1.selectedIndex].value;
var b2 = document.getElementById("box2");
if(f == "no"){
b2.disabled="disabled";
}
else{
b2.disabled="";
}
}
</script>
<select id="box1" onchange="validate()">
<option id="yes" value="yes">Yes</option>
<option id="no" value="no" selected="selected">No</option>
</select>
<select id="box2" disabled>
<option></option>
<option value="">Choose</option>
</select>
</html>