Add a class to <li> if sub menu exist using mysqli query - php

Question

I want to know, how do i add a class to a <li> if it has a sub_menu?
I have a proper HTML menu populated from mysql database.
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav navbar-right">
<li>About us
<ul class="dropdown-menu">
<li>Link 1</li>
<li>Link 2</li>
<li>Link 3</li>
<li>Link 4</li>
<li>Link 5</li>
</ul>
</li>
<li class="dropdown">Contact</li>
</ul>
</div>
I am using bootstrap framework, so for the drop down menu i have to replace my <li> to this:
<li class='dropdown'>
<a aria-expanded='false' aria-haspopup='true' class='dropdown-toggle' data-toggle='dropdown' href='/about-us/' role='button'>
About us <span class='caret'></span>
</a>
</li>
I want to know how do i check if the <li> has any sub_menu before running a sub menu query in the loop? so that i can add markup for dropdown menu.
Here's the PHP Code that generates MENU:
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav navbar-right">
<?php
$res1 = $connection->query("SELECT * FROM primary_nav ORDER BY m_menu_id ASC");
while($menu=$res1->fetch_array())
{
?>
<li>
<a href="<?php echo $domain; ?><?php echo $menu['m_menu_link']; ?>">
<?php echo $menu['m_menu_name']; ?>
</a>
<?php
$res1_pro=$connection->query("SELECT * FROM primary_subnav WHERE m_menu_id=".$menu['m_menu_id']." ORDER BY seq ASC");
//echo "\xA";
?>
<?php
if(mysqli_num_rows($res1_pro) > 0) {
echo '<ul class="dropdown-menu">' ."\xA";
while ($pro1_row = $res1_pro->fetch_array()) {
?>
<li>
<a href="<?php echo $domain; ?><?php echo $pro1_row['s_menu_link']; ?>">
<?php echo $pro1_row['s_menu_name']; ?>
</a>
</li>
<?php
}
echo '</ul>' ."\xA";
}
?>
</li>
<?php
echo "\xA";
}
?>
</ul>
</div>
I could do thi with the jQuery, but i want to do it the HTML way.

Answer 1

You have to add the <li> with the class in the if check for the number of rows. Then you have to add an else clause to echo out the <li> without the class:
<?php
$res1 = $connection->query("SELECT * FROM primary_nav ORDER BY m_menu_id ASC");
while($menu=$res1->fetch_array())
{
$res1_pro=$connection->query("SELECT * FROM primary_subnav WHERE m_menu_id=".$menu['m_menu_id']." ORDER BY seq ASC");
//echo "\xA";
if(mysqli_num_rows($res1_pro) > 0) { // echo the list element with the class here
?>
<li class="foo">
<?php echo $menu['m_menu_name']; ?>
<?php
echo '<ul class="dropdown-menu">' ."\xA";
while ($pro1_row = $res1_pro->fetch_array()) {
?>
<li>
<?php echo $pro1_row['s_menu_name']; ?>
</li>
<?php
}
echo '</ul>' ."\xA";
} else { // echo the normal list element if number of rows is 0
?>
<li>
<?php echo $menu['m_menu_name']; ?>
<?php
}
?>
</li>
<?php
echo "\xA";
}
?>
Note: This particular coding style makes it very hard to write and maintain code should the need arise. You may want to look into ways to combine PHP and HTML to make it easier to update and maintain your code.