[英]codeigniter dropdown order, value chosen on first dropdown musn't apear on 2nd one
[英]Get 2nd Dropdown Value Based on First Dropdown Chosen
JS
<script type="text/javascript">
$(document).ready(function(){
$("#FirstDD").change(function(){
$('#SecDD').load('inc/subcategories.php?scatID='+this.value);
});
});
</script>
的PHP
<select style="width:300px;" id="FirstDD" name="userListingCategory">
<option disabled="disabled">Category...</option>
<?php while($row = $sth2->fetch(PDO::FETCH_ASSOC))
{echo "<option value=". $categoryID . ">" .$row['catName']."</option>";}
unset($sth2);
?>
</select>
<select style="width:340px;" id="SecDD" name="userListingSCategory" style="display:none">
<?php require_once('inc/subcategories.php'); ?>
</div>
</select>
subcategories.php
#GET SELECT category names
$pdo2 = new PDO($h1, $u, $p);
$pdo2->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$sth2 = $pdo2->prepare("
SELECT catID, catName FROM Category
;");
$sth2->execute(array());
#GET SELECT sub-category names
$pdo3 = new PDO($h1, $u, $p);
$pdo3->setAttribute( PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$sth3 = $pdo3->prepare("
SELECT scatID, scatName
FROM Category C, SubCategory SC
WHERE C.catID = SC.catID
AND SC.catID = '$categoryID'
;");
$sth3->execute(array());
?>
<option disabled="disabled">Sub-Category...</option>
<?php
#Get subcats
while($row = $sth3->fetch(PDO::FETCH_ASSOC))
{echo "<option value=". $row['scatID'] . ">" .$row['scatName']."</option>";}
unset($sth3);
?>
問題我選擇了first dropdown category
,然后2nd dropdown
清除了,但未填充subcategories.php
的值。 我認為這是因為$sth2
正在unset()
並嘗試在此之后使用$categoryID
變量(在$sth3 query
)。 我該如何解決??
以下是我想象的使您的代碼無法正常工作的問題:
在“ PHP”中:
您需要先設置$ sth3才能嘗試使用它。
我建議移動線
<?php require_once('inc/subcategories.php'); ?>
到線上方的某個位置:
<?php while($row = $sth2->fetch(PDO::FETCH_ASSOC))
接下來,我認為您需要更改此行:
{echo "<option value=". $categoryID . ">" .$row['catName']."</option>";}
至
{echo "<option value=". $row['catID'] . ">" .$row['catName']."</option>";}
在subcategories.php中:
我看不到在哪里設置了$ categoryID。 因此,如果未從GET參數中進行設置,請添加:
if(!empty($_GET['scatID'])) $categoryID = (int)$_GET['scatID'];
else $categoryID = -1; // Something bogus
之前
#GET SELECT category names
$pdo2 = new PDO($h1, $u, $p);
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