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8.5

Category/Sub-Category Menu Tree

Asked by timrauter in PHP Scripting Language, PHP and Databases

Tags: category, sub-category, menu, tree, php

Hey Everyone,
I need help with a categories/subcategories menu tree for an online store I'm working on. I want to be able to list the menu in the left column of the online store with links to MAIN CATEGORIES as well as showing SUB-CATEGORIES (Infinite level) when a MAIN CATEGORY is selected. Like this:

MAIN CATEGORY 1
  > Sub Category
  > Sub Category
  > Sub Category
    > Sub Sub Category
    > Sub Sub Category
MAIN CATEGORY 2
MAIN CATEGORY 3
etc....

So my problem is that I can get the 1st level child sub-categories but when you try to click the link of the sub-category...it only displays the root categories. I want the user to be able to see the MAIN CATEGORIES first and once they click a MAIN CATEGORY any sub-categories will show up. And when you click those sub-category links...any sub sub categories can show up.

NOTES:
- I want the root categories to always show
- All sub-categories are in <ul>/<li> format
- the GET variable is "cid" when a user clicks a link
- I'd also like to minimize the MYSQL queries so that it doesn't clog it up (if I were to have an infinite number of sub-categories)

DATABASE SET UP
DB: shop_category
cat_id
parent_id
cat_name

Here's the code for my work so far...HELP:
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<ul>
<?php
// FYI the $conn class is just to simplify the MYSQL QUERIES
 
$catID = $_GET['cid'];
$getroot = $conn->dbQuery("SELECT * FROM shop_category WHERE parent_id='0' ORDER BY cat_sort ASC");
while ($rootcat = $conn->dbFetchArray($getroot)) {
echo "<li><a href=\"index.php?cid=$rootcat[cat_id]\">$rootcat[cat_name]</a>";
if($catID !=0) { getSubCategory($catID,$rootcat['cat_id']);}
echo "</li>\n";
}//END while 
$conn->dbFreeResult($getroot);
mysql_close();
 
function getSubCategory($catid,$parentid) {
global $conn;
if($catid == $parentid) {
$getdata = $conn->dbQuery("SELECT * FROM shop_category WHERE parent_id='$catid' ORDER BY cat_sort ASC");
$numrows = $conn->dbNumRows($getdata);
if ($numrows > 0) {
$count = 1;
while ($subcat = $conn->dbFetchArray($getdata)) {
$startlist = ($count ==1) ? "<ul>" : "";
$endlist = ($count ==$numrows) ? "</ul>\n" : "";
echo "$startlist<li>&raquo;&nbsp;&nbsp;<a href=\"index.php?cid=$subcat[cat_id]\">$subcat[cat_name]</a>";
getSubCategory($subcat['cat_id'], $subcat['parent_id']);
echo "</li>$endlist\n";
$count++;
}//END while
} //END numrows >0
}//END if catid = parentid
}//END function
 
?>
</ul>
[+][-]05/12/09 11:02 AM, ID: 24367312Expert Comment

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[+][-]05/15/09 04:39 AM, ID: 24394329Accepted Solution

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About this solution

Zones: PHP Scripting Language, PHP and Databases
Tags: category, sub-category, menu, tree, php
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Solution Provided By: Bobaran98
Participating Experts: 1
Solution Grade: A
 
 
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