我有一个可用的下拉框，但我不确定如何制作它，以便如果他们选择“volksvagen”，它将显示
“你最喜欢的车是大众汽车！”
对于每个选项，依此类推，这里是下拉框的代码。
<div id="dropdown">
<?php
$array1 =
array('Volkswagen' , 'Renault' , 'Land Rover');
echo' <select name="cars">';
foreach($array1 as $cars){
echo'<option value="'.$cars.'">'.$cars.'</option>';
}
echo'</select>';
?>
</div>
javascript 没用过..试试看..!!
<form method="post">
<div id="dropdown">
<?php
if(isset($_POST['cars']))
{
$mycar=$_POST['cars'];
}
else
{
$mycar='';
}
$array1 = array('Volkswagen' , 'Renault' , 'Land Rover');
echo' <select name="cars" onchange="this.form.submit()">';
foreach($array1 as $cars){ ?>
<option value="<?php echo $cars; ?>" <?php if($mycar==$cars) echo "selected='selected'"; ?> ><?php echo $cars; ?></option>
<?php
}
echo'</select>
</div></form>';
echo 'your favourite car is : '; echo $mycar;
?>
<body onload="showCar()">
<div id="dropdown">
<?php
$array1 =
array('Volkswagen' , 'Renault' , 'Land Rover');
echo' <select name="cars" id="cars" onchange="showCar()">';
foreach($array1 as $cars){
echo'<option value="'.$cars.'">'.$cars.'</option>';
}
echo'</select>';
?>
<div id="demo"> </div>
<script>
function showCar() {
var car = document.getElementById('cars').value;
document.getElementById("demo").innerHTML="Your Favourite Car is "+car+"!";
}
</script>
</div>
</body>
尝试这个
<div id="dropdown">
<?php
$array1 =
array('Volkswagen' , 'Renault' , 'Land Rover');
echo' <select name="cars" onchange="display_message(this.value);">';
foreach($array1 as $cars){
echo'<option value="'.$cars.'">'.$cars.'</option>';
}
echo'</select>';
?>
<span id="message"></span>
</div>
<script>
function display_message($selected_value)
{
document.getElementById('message').innerHTML = 'Your Favourite Car is'+$selected_value+'!';
}
</script>