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Using PHP to create dynamic menu from mySQL database


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Here shows you how to Use PHP to create dynamic menu from mySQL database. Click here to view PHP-level-3 sample>>

Part 1: Overview

With Sothink DHTML Menu, you can easily create dynamic DHTML/JavaScript menus from database. The menu structure can be stored in database tables and retrieved by any server side scripts like ASP or PHP. This document shows how to create a dynamic menu from database by using PHP and mySQL database.

In brief, to create a dynamic menu from database, you can configure the Prefix or Suffix in the "Menu Item > Condition" of Sothink DHTML Menu.

View a dynamic menu sample which menu structure is generated from database >>

PHP drop down menu

As you see, in this sample, the menu contains two levels: the parent level showing the product categories and the sub level showing the specific products. Actually, there are only two menu items, one in the parent level and the other is in the sub level.
The final result that you are seeing is just got from database.

PHP drop down menu item

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Part 2: Steps

The following are the steps of this example:

1. Before creating the menu, you should make a database containing the information of the product categories and the specific products.
To do this, create a database named "dmenu" in your mySQL, create a database user named "dbuser" and the password is "123". Then you can use the following code to generate tables:
CREATE TABLE Category (
CID int(11) NOT NULL auto_increment,
Name char(255) DEFAULT '' NOT NULL,
Notes char(255),
PRIMARY KEY (CID)
);

CREATE TABLE Product (
PID int(11) NOT NULL auto_increment,
CID int(11),
Name char(255) DEFAULT '' NOT NULL,
Link char(255),
Notes char(255),
PRIMARY KEY (PID)
);

Then you can add a few records to the tables.

2. Launch Sothink DHTML Menu and create a new menu. Click "General" in "Menu Item", select "HTML". Input <?=$CatName?> in the context box.

Navigation bar - menu item general

3. Click"Condition" in "Menu Item".

JavaScript menu - menu item general

4. In "Menu Item > Condition" Dialog, input the prefix and suffix for the menu item.

JavaScript menu - menu item condition

Note: When you add the condition, you may get a warning message in DHTML Menu. That's because the condition code is server-side code which can not be processed by the browser directly. The warning will not show when you add the menu to a PHP page that is supported by server. You can uncheck "Preview > Enable Auto-Refresh" to avoid seeing the warnings.
Tips: To prevent this error popping up, you can add the JavaScript comment delimiters /* and */ to the Prefix as well as Suffix. In that way the preview ignores the extra code and the code works well on the server side processing.
For example:
Prefix:
/*
<?
for ($i = 0; $i < $numrowsCat; $i++)
{
$rowCat = mysql_fetch_array($resultCat);
$CatName = $rowCat["Name"];
?>
*/

Suffix:
/*<?
}
?>
*/

5. Click "Add" button to add a sub item of it. Change the item type to "HTML", then input <?=$ProName?>. In the link field, input <?=$Link?>.

drop down menu - menu item general

6. Click "Condition" in "Menu Item" and input the prefix and suffix for the menu item.

drop down menu - menu item condition

Note: Normally in order to optimize the menu code, if several menu items have the same property, only one item's property code is recorded and other items take reference of its property code. If we add a condition to this item, there is possibility that it will be invisible when its condition is not met. And its property code can not be referenced by other items either. This will cause the whole menu can not work correctly. Please do check "This item may be invisible at run-time" to avoid the problem.


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Part 3: Code Explanation


This is the source code at the beginning of this sample page.



Code

Explanation

<?
$dbhost = "localhost"; // DB Host name
$dbusername = "dbuser"; // DB User
$dbpass = "123"; // DB User password
$dbname = "dmenu"; // DB Name
$query = "select * from Category";
$connection = mysql_connect($dbhost, $dbusername, $dbpass);

Connect with the database.
$resultCat = mysql_db_query($dbname, $query);
$numrowsCat = mysql_num_rows($resultCat);
?>  
Retrieve recordset from the CATEGORY table.

After you add item condition and edit the menu item, DHTML Menu inserts following code into the page. The entire source code below is generated by DHTML Menu program. Your editing of conditions will be saved in the menu's configuration file (*.pgt), which can be edited again.
To learn further what the code represents, please read the following code explanation:

Code

Explanation

stm_bm(["uueoehr",400,"".....) Begin the whole menu.
    stm_bp("p0",[0,4,0,0,3,1,0,0,100,"",-2...... ) Begin a popup menu (items of category).
<?
for ($i = 0; $i < $numrowsCat; $i++)
{
     $rowCat = mysql_fetch_array($resultCat);
     $CatName = $rowCat["Name"];
?>
Walk through the CATEGORY recordset and save each category's name as variable "sCatName".
         stm_ai("p0i0",[1,"<?=$CatName?>","",.....) <?=$CatName?> is the category name.
         stm_bpx("p1","p0",[1,4,0,-1,.....) Begin a popup menu (items of product).

<?
$queryPro = "select * from Product where CID=".$rowCat["CID"];
$resultPro = mysql_db_query($dbname, $queryPro);
$numrowsPro = mysql_num_rows($resultPro);

for ($j = 0; $j<$numrowsPro; $j++)
{
$rowPro = mysql_fetch_array($resultPro);
$ProName = $rowPro["Name"];
$Link = $rowPro["Link"];
?>

Retrieve recordset from the PRODUCT table. Walk through the PRODUCT recordset and save product name and link as temporary variables.

         stm_ai("p1i0",[1,"<?=$ProName?> .....) Append an item. <?=$ProName?> is the item text.

<?
}
?>

Move to the next record of PRODUCT table.
  &nbspstm_ep() End of a popup menu.

<?
}
?>

Move to the next record of the CATEGORY recordset.

   stm_ep() End of a popup menu.
stm_em() End of the whole menu.

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