[英]Dependent dropdowns not working, 2nd dropdown not loading
我需要與此有關的幫助,我不知道為什么子貓不會加載。 但第一個下拉菜單會加載所有查詢。 我只是不知道為什么它不能與第二個。
這是我的index.php
<?php
include('config.php');
$query_parent = mysql_query("SELECT * FROM zipcodes GROUP BY major_area") or die("Query failed: ".mysql_error());
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Dependent DropDown List</title>
<script type="text/javascript" src="js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#parent_cat").change(function() {
$(this).after('<div id="loader"><img src="img/loading.gif" alt="loading subcategory" /></div>');
$.get('loadsubcat.php?parent_cat=' + $(this).val(), function(data) {
$("#sub_cat").html(data);
$('#loader').slideUp(200, function() {
$(this).remove();
});
});
});
});
</script>
</head>
<body>
<form method="get">
<label for="category">Parent Category</label>
<select name="parent_cat" id="parent_cat">
<?php while($row = mysql_fetch_array($query_parent)): ?>
<option value="<?php echo $row['major_area']; ?>"><?php echo $row['major_area']; ?></option>
<?php endwhile; ?>
</select>
<br/><br/>
<label>Sub Category</label>
<select name="sub_cat" id="sub_cat"></select>
</form>
</body>
</html>
這是我的loadsubcat.php
<?php
include('config.php');
$parent_cat = $_GET['parent_cat'];
$query = mysql_query("SELECT city FROM zipcodes WHERE major_area = {$parent_cat}") or die(mysql_error());
while($row = mysql_fetch_array($query)) {
echo "<option value='$row[city]'>$row[city]</option>";
}
?>
請檢查我的代碼,並告訴我我在哪里做錯了。 它不會加載第二個下拉菜單。
嘗試做一個簡單的AJAX
函數:
<script type="text/javascript">
function AjaxCall(ElemVal,PlaceId) {
$.ajax({
url: "loadsubcat.php?parent_cat="+$(ElemVal).val(),
success: function(result) {
$("#"+ PlaceId).html(result);
}
});
}
$(document).ready(function() {
$("#parent_cat").change(function() {
$("#sub-cat-load").html('<div id="loader"><img src="img/loading.gif" alt="loading subcategory" /></div>');
AjaxCall(this,'sub-cat-load');
});
});
</script>
sub_cat容器
<label>Sub Category</label>
<!-- NOTICE THIS PART -->
<div id="sub-cat-load"></div>
loadsubcat.php
<?php
include('config.php');
// You may want to sanitize this variable
$parent_cat = $_GET['parent_cat'];
$query = mysql_query("SELECT city FROM zipcodes WHERE major_area = {$parent_cat}") or die(mysql_error()); ?>
<select name="sub_cat" id="sub_cat"><?php
while($row = mysql_fetch_array($query)) { ?>
<option value="<?php echo $row[city]; ?>"><?php echo $row[city]; ?></option><?php
} ?>
</select>
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