我有两个下拉列表作为我正在创建的表单的一部分,它们都有从 mysql 数据库中提取的选项。我希望第二个下拉列表中的选项根据第一个下拉列表中的选择进行更改。当第二个列表是静态的时,我知道如何使用 Javascript 执行此操作,但我希望两个下拉列表都从数据库中动态提取。下面是我目前正在使用的 HTML 和 Javascript。任何想法都会很棒。
HTML:
<form>
<label for="org_name">Organization Name:</label>
<select id="org_name" name="org_name" onchange="configureDropDownLists(this,'submitter_name')">
<option value="empty"> </option>
<?php
mysql_connect("database", "username", "password") or die(mysql_error ());
mysql_select_db("databaseName") or die(mysql_error());
$query = "SELECT * FROM Table";
$result = mysql_query($query);
while($row = mysql_fetch_array($result)){
echo "<option value='" . $row['org_name'] . "'>" . $row['org_name'] . "</option>";
}
mysql_close();
?>
</select>
<label for="submitter_name">Request Submitted By:</label>
<select id="submitter_name" name="submitter_name">
<option value="empty"> </option>
</select>
<input type="Submit" value="Submit">
</form>
Javascript:
function configureDropDownLists(org_name,submitter_name) {
var org = new Array('Submitter 1', 'Submitter 2');
switch (org_name.value) {
case 'org':
document.getElementById(submitter_name).options.length = 1;
for (i = 0; i < org.length; i++) {
createOption(document.getElementById(submitter_name), org[i], org[i]);
}
break;
default:
document.getElementById(submitter_name).options.length = 1;
break;
}
createOption(document.getElementById(submitter_name), 'Other', 'Other');
if (org_name.value === 'empty') {
document.getElementById(submitter_name).options.length = 1;
}
}
function createOption(ddl, text, value) {
var opt = document.createElement('option');
opt.value = value;
opt.text = text;
ddl.options.add(opt);
}