dynamic-linked-dropdown-menu-phpmysqljavascript
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CODE VOOR DUAL-SELECT
Code (php)
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<?
// Database connection
$db_database = 'databasename';
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
mysql_connect($db_host,$db_user,$db_pass) or die("Could not connect to MySQL (Main connection)");
mysql_select_db($db_database) or die("Could not connect to database (Main connection)");
function dual_linked_select(
$table, // Table to create linked selects from
$table_column_01, // Root category
$table_column_02, // Subcategory of the root category
$group_02_default_option_text // Default option text for the group 2 select
)
{
// Define globals
global $javascript;
global $group_01_options;
// Define variables
$javascript = null; // Hold
$group_01_options = null;//Hold
// Assembly of Javascript starts
$javascript .=<<<content
/* Linked Dropdown Selects Script Start */
function DefaultGroup2()
{
var x = document.getElementById("Group2");
x.length = 0;
VarGroup2 = document.getElementById("Group2");
VarGroup2.options[VarGroup2.options.length] = new Option("$group_02_default_option_text","");
document.getElementById("Group2").disabled = true;
}
function CheckGroup1Select()
{
// If no Group1 is selected clear the Group2 and set to default
if(document.getElementById("Group1").value == "")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
}
content;
// Javascript
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$group_01_options .= '<option value="'.$group_01[$table_column_01].'">'.$group_01[$table_column_01].'</option>'."\r\n";
$javascript .=<<<content
else if(document.getElementById("Group1").value == "$group_01[$table_column_01]")
{
// Clear the Group2 and set to default value
DefaultGroup2();
// Set variable options for Group2 select
VarGroup2 = document.getElementById("Group2");
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=' VarGroup2.options[VarGroup2.options.length] = new Option("'.$group_02[$table_column_02].'","'.$group_02[$table_column_02].'");'."\r\n";
}
$javascript .=<<<content
document.getElementById("Group2").disabled = false;
}
content;
}
$javascript .=' }'."\r\n";
} // End of dual_linked_selects function
?>
<?
// execute dual_linked_selects_function
dual_linked_select('tabel_name','table_column1','tablecolumn2','Select...');
?>
<html>
<head>
<title>Dual Linked Selects with PHP and MYSQL (without page reload)</title>
<script type="text/javascript" language="JavaScript">
<? echo $javascript; ?>
</script>
</head>
<body>
<form action="">
Group1:
<br>
<select id="Group1" name="group1" onchange="CheckGroup1Select(this);">
<option value="">Select...</option>
<? echo $group_01_options; ?>
</select>
<br>
Group2:
<br>
<select id="Group2" name="group2"></select>
</form>
</body>
</html>
// Database connection
$db_database = 'databasename';
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
mysql_connect($db_host,$db_user,$db_pass) or die("Could not connect to MySQL (Main connection)");
mysql_select_db($db_database) or die("Could not connect to database (Main connection)");
function dual_linked_select(
$table, // Table to create linked selects from
$table_column_01, // Root category
$table_column_02, // Subcategory of the root category
$group_02_default_option_text // Default option text for the group 2 select
)
{
// Define globals
global $javascript;
global $group_01_options;
// Define variables
$javascript = null; // Hold
$group_01_options = null;//Hold
// Assembly of Javascript starts
$javascript .=<<<content
/* Linked Dropdown Selects Script Start */
function DefaultGroup2()
{
var x = document.getElementById("Group2");
x.length = 0;
VarGroup2 = document.getElementById("Group2");
VarGroup2.options[VarGroup2.options.length] = new Option("$group_02_default_option_text","");
document.getElementById("Group2").disabled = true;
}
function CheckGroup1Select()
{
// If no Group1 is selected clear the Group2 and set to default
if(document.getElementById("Group1").value == "")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
}
content;
// Javascript
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$group_01_options .= '<option value="'.$group_01[$table_column_01].'">'.$group_01[$table_column_01].'</option>'."\r\n";
$javascript .=<<<content
else if(document.getElementById("Group1").value == "$group_01[$table_column_01]")
{
// Clear the Group2 and set to default value
DefaultGroup2();
// Set variable options for Group2 select
VarGroup2 = document.getElementById("Group2");
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=' VarGroup2.options[VarGroup2.options.length] = new Option("'.$group_02[$table_column_02].'","'.$group_02[$table_column_02].'");'."\r\n";
}
$javascript .=<<<content
document.getElementById("Group2").disabled = false;
}
content;
}
$javascript .=' }'."\r\n";
} // End of dual_linked_selects function
?>
<?
// execute dual_linked_selects_function
dual_linked_select('tabel_name','table_column1','tablecolumn2','Select...');
?>
<html>
<head>
<title>Dual Linked Selects with PHP and MYSQL (without page reload)</title>
<script type="text/javascript" language="JavaScript">
<? echo $javascript; ?>
</script>
</head>
<body>
<form action="">
Group1:
<br>
<select id="Group1" name="group1" onchange="CheckGroup1Select(this);">
<option value="">Select...</option>
<? echo $group_01_options; ?>
</select>
<br>
Group2:
<br>
<select id="Group2" name="group2"></select>
</form>
</body>
</html>
CODE VOOR TRIPLE SELECT
Code (php)
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<?
// Database connection
$db_database = 'databasename';
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
mysql_connect($db_host,$db_user,$db_pass) or die("Could not connect to MySQL (Main connection)");
mysql_select_db($db_database) or die("Could not connect to database (Main connection)");
// Start of triple_linked_selects function
function triple_linked_selects(
$table, // Table to create linked selects from
$table_column_01, // Root category
$table_column_02, // Subcategory of the root category
$table_column_03, // Available items in subcategory of the root category
$group_02_default_option_text, // Default option text for the group 2 select
$group_03_default_option_text) // Default option text for the group 3 select
{
// Define globals
global $javascript;
global $group_01_options;
// Define variables
$javascript = null; // Holds all the generated javascript
$group_01_options = null; // Holds all the select options for group 1
// Static Javascript
$javascript .=<<<content
/* Linked Dropdown Selects Script Start */
function DefaultGroup2()
{
var x = document.getElementById("Group2");
x.length = 0;
VarGroup2 = document.getElementById("Group2");
VarGroup2.options[VarGroup2.options.length] = new Option("$group_02_default_option_text","");
document.getElementById("Group2").disabled = true;
}
function DefaultGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
VarGroup3 = document.getElementById("Group3");
VarGroup3.options[VarGroup3.options.length] = new Option("$group_03_default_option_text","");
document.getElementById("Group3").disabled = true;
}
function ClearGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
document.getElementById("Group3").disabled = false;
}
function CheckGroup1Select()
{
// If no Group1 is selected clear the Group2 and Group3 selects and set them to their default values
if(document.getElementById("Group1").value == "")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Clear the Group3 select and set to default value
DefaultGroup3();
}
content;
// Groups 1 & 2 Javascript
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$group_01_options .= '<option value="'.$group_01[$table_column_01].'">'.$group_01[$table_column_01].'</option>'."\r\n";
$javascript .=<<<content
else if(document.getElementById("Group1").value == "$group_01[$table_column_01]")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Set dynamic options for Group2 select
VarGroup2 = document.getElementById("Group2");
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=' VarGroup2.options[VarGroup2.options.length] = new Option("'.$group_02[$table_column_02].'","'.$group_02[$table_column_02].'");'."\r\n";
}
$javascript .=<<<content
document.getElementById("Group2").disabled = false;
// Clear the Group3 select and set to default value
DefaultGroup3();
}
content;
}
$javascript .=' }'."\r\n";
// Group 3 Javascript
$javascript .=<<<content
function CheckGroup2Select()
{
content;
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$javascript .=<<<content
if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (!document.getElementById("Group2").value))
{
// Clear the Group3 select and set to default value
DefaultGroup3();
}
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_01.",".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=<<<content
else if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (document.getElementById("Group2").value == "$group_02[$table_column_02]"))
{
ClearGroup3();
VarGroup3 = document.getElementById("Group3");
content;
$group_03_query = "SELECT * FROM ".$table." WHERE ".$table_column_02." = '".$group_02[$table_column_02]."' AND ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_03;
$group_03_result = mysql_query($group_03_query) or die(mysql_error());
while($group_03 = mysql_fetch_array($group_03_result))
{
$javascript .=' VarGroup3.options[VarGroup3.options.length] = new Option("'.$group_03[$table_column_03].'","'.$group_03[$table_column_03].'");'."\r\n";
}
$javascript .=' }'."\r\n";
}
}
$javascript .=<<<content
}
window.onload = CheckGroup1Select;
/* Linked Dropdown Selects Script End */
content;
} // End of triple_linked_selects function
?>
<?
// Call the triple_linked_selects function
triple_linked_selects('tabel_name','table_column1','tablecolumn2','tablecolumn3','Select...','------------');
?>
<html>
<head>
<title>Triple Linked Selects</title>
<script type="text/javascript" language="JavaScript">
<? echo $javascript; ?>
</script>
</head>
<body>
<form action="">
Group1:
<br>
<select id="Group1" name="Group1" onchange="CheckGroup1Select(this);">
<option value="">Select...</option>
<? echo $group_01_options; ?>
</select>
<br>
Group2:
<br>
<select id="Group2" name="Group2" onchange="CheckGroup2Select(this);"></select>
<br>
Group3:
<br>
<select id="Group3" name="Group3"></select>
</form>
</body>
</html>
// Database connection
$db_database = 'databasename';
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
mysql_connect($db_host,$db_user,$db_pass) or die("Could not connect to MySQL (Main connection)");
mysql_select_db($db_database) or die("Could not connect to database (Main connection)");
// Start of triple_linked_selects function
function triple_linked_selects(
$table, // Table to create linked selects from
$table_column_01, // Root category
$table_column_02, // Subcategory of the root category
$table_column_03, // Available items in subcategory of the root category
$group_02_default_option_text, // Default option text for the group 2 select
$group_03_default_option_text) // Default option text for the group 3 select
{
// Define globals
global $javascript;
global $group_01_options;
// Define variables
$javascript = null; // Holds all the generated javascript
$group_01_options = null; // Holds all the select options for group 1
// Static Javascript
$javascript .=<<<content
/* Linked Dropdown Selects Script Start */
function DefaultGroup2()
{
var x = document.getElementById("Group2");
x.length = 0;
VarGroup2 = document.getElementById("Group2");
VarGroup2.options[VarGroup2.options.length] = new Option("$group_02_default_option_text","");
document.getElementById("Group2").disabled = true;
}
function DefaultGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
VarGroup3 = document.getElementById("Group3");
VarGroup3.options[VarGroup3.options.length] = new Option("$group_03_default_option_text","");
document.getElementById("Group3").disabled = true;
}
function ClearGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
document.getElementById("Group3").disabled = false;
}
function CheckGroup1Select()
{
// If no Group1 is selected clear the Group2 and Group3 selects and set them to their default values
if(document.getElementById("Group1").value == "")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Clear the Group3 select and set to default value
DefaultGroup3();
}
content;
// Groups 1 & 2 Javascript
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$group_01_options .= '<option value="'.$group_01[$table_column_01].'">'.$group_01[$table_column_01].'</option>'."\r\n";
$javascript .=<<<content
else if(document.getElementById("Group1").value == "$group_01[$table_column_01]")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Set dynamic options for Group2 select
VarGroup2 = document.getElementById("Group2");
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=' VarGroup2.options[VarGroup2.options.length] = new Option("'.$group_02[$table_column_02].'","'.$group_02[$table_column_02].'");'."\r\n";
}
$javascript .=<<<content
document.getElementById("Group2").disabled = false;
// Clear the Group3 select and set to default value
DefaultGroup3();
}
content;
}
$javascript .=' }'."\r\n";
// Group 3 Javascript
$javascript .=<<<content
function CheckGroup2Select()
{
content;
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$javascript .=<<<content
if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (!document.getElementById("Group2").value))
{
// Clear the Group3 select and set to default value
DefaultGroup3();
}
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_01.",".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=<<<content
else if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (document.getElementById("Group2").value == "$group_02[$table_column_02]"))
{
ClearGroup3();
VarGroup3 = document.getElementById("Group3");
content;
$group_03_query = "SELECT * FROM ".$table." WHERE ".$table_column_02." = '".$group_02[$table_column_02]."' AND ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_03;
$group_03_result = mysql_query($group_03_query) or die(mysql_error());
while($group_03 = mysql_fetch_array($group_03_result))
{
$javascript .=' VarGroup3.options[VarGroup3.options.length] = new Option("'.$group_03[$table_column_03].'","'.$group_03[$table_column_03].'");'."\r\n";
}
$javascript .=' }'."\r\n";
}
}
$javascript .=<<<content
}
window.onload = CheckGroup1Select;
/* Linked Dropdown Selects Script End */
content;
} // End of triple_linked_selects function
?>
<?
// Call the triple_linked_selects function
triple_linked_selects('tabel_name','table_column1','tablecolumn2','tablecolumn3','Select...','------------');
?>
<html>
<head>
<title>Triple Linked Selects</title>
<script type="text/javascript" language="JavaScript">
<? echo $javascript; ?>
</script>
</head>
<body>
<form action="">
Group1:
<br>
<select id="Group1" name="Group1" onchange="CheckGroup1Select(this);">
<option value="">Select...</option>
<? echo $group_01_options; ?>
</select>
<br>
Group2:
<br>
<select id="Group2" name="Group2" onchange="CheckGroup2Select(this);"></select>
<br>
Group3:
<br>
<select id="Group3" name="Group3"></select>
</form>
</body>
</html>
CODE VOOR QUAD SELECT
Code (php)
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<?
// Database connection
$db_database = 'databasename';
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
mysql_connect($db_host,$db_user,$db_pass) or die("Could not connect to MySQL (Main connection)");
mysql_select_db($db_database) or die("Could not connect to database (Main connection)");
// Start of quad_linked_selects function
function quad_linked_selects(
$table, // Table name
$table_column_01, // Root category
$table_column_02, // Available items in sub category
$table_column_03, // Available items in sub-sub category
$table_column_04, // Available items in sub-sub-sub category
$group_02_default_option_text, // Default option text for the group 2 select
$group_03_default_option_text, // Default option text for the group 3 select
$group_04_default_option_text) // Default option text for the group 4 select
{
// Define globals
global $javascript;
global $group_01_options;
// Define variables
$javascript = null; // Holds all the generated javascript
$group_01_options = null; // Holds all the select options for group 1
// Static Javascript
$javascript .=<<<content
/* Linked Dropdown Selects Script Start */
function DefaultGroup2()
{
var x = document.getElementById("Group2");
x.length = 0;
VarGroup2 = document.getElementById("Group2");
VarGroup2.options[VarGroup2.options.length] = new Option("$group_02_default_option_text","");
document.getElementById("Group2").disabled = true;
}
function DefaultGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
VarGroup3 = document.getElementById("Group3");
VarGroup3.options[VarGroup3.options.length] = new Option("$group_03_default_option_text","");
document.getElementById("Group3").disabled = true;
}
function DefaultGroup4()
{
var x = document.getElementById("Group4");
x.length = 0;
VarGroup4 = document.getElementById("Group4");
VarGroup4.options[VarGroup4.options.length] = new Option("$group_04_default_option_text","");
document.getElementById("Group4").disabled = true;
}
function ClearGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
document.getElementById("Group3").disabled = false;
}
function ClearGroup4()
{
var x = document.getElementById("Group4");
x.length = 0;
document.getElementById("Group4").disabled = false;
}
function CheckGroup1Select()
{
// If no Group1 is selected clear the Group2 and Group3 selects and set them to their default values
if(document.getElementById("Group1").value == "")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Clear the Group3 select and set to default value
DefaultGroup3();
// Clear the Group4 select and set to default value
DefaultGroup4();
}
content;
// Groups 1 & 2 Javascript
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$group_01_options .= '<option value="'.$group_01[$table_column_01].'">'.$group_01[$table_column_01].'</option>'."\r\n";
$javascript .=<<<content
else if(document.getElementById("Group1").value == "$group_01[$table_column_01]")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Set dynamic options for Group2 select
VarGroup2 = document.getElementById("Group2");
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=' VarGroup2.options[VarGroup2.options.length] = new Option("'.$group_02[$table_column_02].'","'.$group_02[$table_column_02].'");'."\r\n";
}
$javascript .=<<<content
document.getElementById("Group2").disabled = false;
// Clear the Group3 select and set to default value
DefaultGroup3();
DefaultGroup4();
}
content;
}
$javascript .=' }'."\r\n";
// Group 3 Javascript
$javascript .=<<<content
function CheckGroup2Select()
{
content;
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$javascript .=<<<content
if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (!document.getElementById("Group2").value))
{
// Clear the Group3&4 select and set to default value
DefaultGroup3();
DefaultGroup4();
}
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_01.",".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=<<<content
else if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (document.getElementById("Group2").value == "$group_02[$table_column_02]"))
{
DefaultGroup3();
VarGroup3 = document.getElementById("Group3");
content;
$group_03_query = "SELECT * FROM ".$table." WHERE ".$table_column_02." = '".$group_02[$table_column_02]."' AND ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_03;
$group_03_result = mysql_query($group_03_query) or die(mysql_error());
while($group_03 = mysql_fetch_array($group_03_result))
{
$javascript .=' VarGroup3.options[VarGroup3.options.length] = new Option("'.$group_03[$table_column_03].'","'.$group_03[$table_column_03].'");'."\r\n" ;
}
$javascript .=' document.getElementById("Group3").disabled = false;
DefaultGroup4();
}'."\r\n";
}
}
$javascript .=<<<content
}
content;
// Group 4 Javascript
$javascript .=<<<content
function CheckGroup3Select()
{
content;
$group_01_query = "SELECT ".$table_column_01.", ".$table_column_02." FROM ".$table." GROUP BY ".$table_column_02;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$javascript .=<<<content
if((document.getElementById("Group2").value == "$group_01[$table_column_02]") && (document.getElementById("Group3").value == "$group_01[$table_column_03]") && (!document.getElementById("Group4").value))
{
// Clear the Group4 select and set to default value
DefaultGroup4();
}
content;
$group_02_query = "SELECT ".$table_column_02.", ".$table_column_03." FROM ".$table." WHERE ".$table_column_02." = '".$group_01[$table_column_02]."' GROUP BY ".$table_column_02.",".$table_column_03;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=<<<content
else if((document.getElementById("Group2").value == "$group_01[$table_column_02]") && (document.getElementById("Group3").value == "$group_02[$table_column_03]"))
{
DefaultGroup4();
VarGroup4 = document.getElementById("Group4");
content;
$group_03_query = "SELECT * FROM ".$table." WHERE ".$table_column_03." = '".$group_02[$table_column_03]."' AND ".$table_column_02." = '".$group_01[$table_column_02]."' GROUP BY ".$table_column_04;
$group_03_result = mysql_query($group_03_query) or die(mysql_error());
while($group_03 = mysql_fetch_array($group_03_result))
{
$javascript .=' VarGroup4.options[VarGroup4.options.length] = new Option("'.$group_03[$table_column_04].'","'.$group_03[$table_column_04].'");'."\r\n";
}
$javascript .=' document.getElementById("Group4").disabled = false;
}'."\r\n";
}
}
$javascript .=<<<content
}
window.onload = CheckGroup1Select;
/* Linked Dropdown Selects Script End */
content;
} // End of quad_linked_selects function
?>
<?
// Call the quad_linked_selects function
quad_linked_selects('tablename','tablecolumn1','tablecolumn2','tablecolumn3','tablecolumn4','Select...','------------','------------');
?>
<html>
<head>
<title>Triple Linked Selects</title>
<script type="text/javascript" language="JavaScript">
<? echo $javascript; ?>
</script>
</head>
<body>
<form action="">
Group1:
<br>
<select id="Group1" name="Group1" onchange="CheckGroup1Select(this);">
<option value="">Select...</option>
<? echo $group_01_options; ?>
</select>
<br>
Group2:
<br>
<select id="Group2" name="Group2" onchange="CheckGroup2Select(this);"></select>
<br>
Group3:
<br>
<select id="Group3" name="Group3" onchange="CheckGroup3Select(this);"></select>
<br>
Group4:
<br>
<select id="Group4" name="Group4"></select>
</form>
</body>
</html>
// Database connection
$db_database = 'databasename';
$db_host = 'localhost';
$db_user = 'username';
$db_pass = 'password';
mysql_connect($db_host,$db_user,$db_pass) or die("Could not connect to MySQL (Main connection)");
mysql_select_db($db_database) or die("Could not connect to database (Main connection)");
// Start of quad_linked_selects function
function quad_linked_selects(
$table, // Table name
$table_column_01, // Root category
$table_column_02, // Available items in sub category
$table_column_03, // Available items in sub-sub category
$table_column_04, // Available items in sub-sub-sub category
$group_02_default_option_text, // Default option text for the group 2 select
$group_03_default_option_text, // Default option text for the group 3 select
$group_04_default_option_text) // Default option text for the group 4 select
{
// Define globals
global $javascript;
global $group_01_options;
// Define variables
$javascript = null; // Holds all the generated javascript
$group_01_options = null; // Holds all the select options for group 1
// Static Javascript
$javascript .=<<<content
/* Linked Dropdown Selects Script Start */
function DefaultGroup2()
{
var x = document.getElementById("Group2");
x.length = 0;
VarGroup2 = document.getElementById("Group2");
VarGroup2.options[VarGroup2.options.length] = new Option("$group_02_default_option_text","");
document.getElementById("Group2").disabled = true;
}
function DefaultGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
VarGroup3 = document.getElementById("Group3");
VarGroup3.options[VarGroup3.options.length] = new Option("$group_03_default_option_text","");
document.getElementById("Group3").disabled = true;
}
function DefaultGroup4()
{
var x = document.getElementById("Group4");
x.length = 0;
VarGroup4 = document.getElementById("Group4");
VarGroup4.options[VarGroup4.options.length] = new Option("$group_04_default_option_text","");
document.getElementById("Group4").disabled = true;
}
function ClearGroup3()
{
var x = document.getElementById("Group3");
x.length = 0;
document.getElementById("Group3").disabled = false;
}
function ClearGroup4()
{
var x = document.getElementById("Group4");
x.length = 0;
document.getElementById("Group4").disabled = false;
}
function CheckGroup1Select()
{
// If no Group1 is selected clear the Group2 and Group3 selects and set them to their default values
if(document.getElementById("Group1").value == "")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Clear the Group3 select and set to default value
DefaultGroup3();
// Clear the Group4 select and set to default value
DefaultGroup4();
}
content;
// Groups 1 & 2 Javascript
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$group_01_options .= '<option value="'.$group_01[$table_column_01].'">'.$group_01[$table_column_01].'</option>'."\r\n";
$javascript .=<<<content
else if(document.getElementById("Group1").value == "$group_01[$table_column_01]")
{
// Clear the Group2 select and set to default value
DefaultGroup2();
// Set dynamic options for Group2 select
VarGroup2 = document.getElementById("Group2");
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=' VarGroup2.options[VarGroup2.options.length] = new Option("'.$group_02[$table_column_02].'","'.$group_02[$table_column_02].'");'."\r\n";
}
$javascript .=<<<content
document.getElementById("Group2").disabled = false;
// Clear the Group3 select and set to default value
DefaultGroup3();
DefaultGroup4();
}
content;
}
$javascript .=' }'."\r\n";
// Group 3 Javascript
$javascript .=<<<content
function CheckGroup2Select()
{
content;
$group_01_query = "SELECT ".$table_column_01." FROM ".$table." GROUP BY ".$table_column_01;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$javascript .=<<<content
if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (!document.getElementById("Group2").value))
{
// Clear the Group3&4 select and set to default value
DefaultGroup3();
DefaultGroup4();
}
content;
$group_02_query = "SELECT ".$table_column_02." FROM ".$table." WHERE ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_01.",".$table_column_02;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=<<<content
else if((document.getElementById("Group1").value == "$group_01[$table_column_01]") && (document.getElementById("Group2").value == "$group_02[$table_column_02]"))
{
DefaultGroup3();
VarGroup3 = document.getElementById("Group3");
content;
$group_03_query = "SELECT * FROM ".$table." WHERE ".$table_column_02." = '".$group_02[$table_column_02]."' AND ".$table_column_01." = '".$group_01[$table_column_01]."' GROUP BY ".$table_column_03;
$group_03_result = mysql_query($group_03_query) or die(mysql_error());
while($group_03 = mysql_fetch_array($group_03_result))
{
$javascript .=' VarGroup3.options[VarGroup3.options.length] = new Option("'.$group_03[$table_column_03].'","'.$group_03[$table_column_03].'");'."\r\n" ;
}
$javascript .=' document.getElementById("Group3").disabled = false;
DefaultGroup4();
}'."\r\n";
}
}
$javascript .=<<<content
}
content;
// Group 4 Javascript
$javascript .=<<<content
function CheckGroup3Select()
{
content;
$group_01_query = "SELECT ".$table_column_01.", ".$table_column_02." FROM ".$table." GROUP BY ".$table_column_02;
$group_01_result = mysql_query($group_01_query) or die(mysql_error());
while($group_01 = mysql_fetch_array($group_01_result))
{
$javascript .=<<<content
if((document.getElementById("Group2").value == "$group_01[$table_column_02]") && (document.getElementById("Group3").value == "$group_01[$table_column_03]") && (!document.getElementById("Group4").value))
{
// Clear the Group4 select and set to default value
DefaultGroup4();
}
content;
$group_02_query = "SELECT ".$table_column_02.", ".$table_column_03." FROM ".$table." WHERE ".$table_column_02." = '".$group_01[$table_column_02]."' GROUP BY ".$table_column_02.",".$table_column_03;
$group_02_result = mysql_query($group_02_query) or die(mysql_error());
while($group_02 = mysql_fetch_array($group_02_result))
{
$javascript .=<<<content
else if((document.getElementById("Group2").value == "$group_01[$table_column_02]") && (document.getElementById("Group3").value == "$group_02[$table_column_03]"))
{
DefaultGroup4();
VarGroup4 = document.getElementById("Group4");
content;
$group_03_query = "SELECT * FROM ".$table." WHERE ".$table_column_03." = '".$group_02[$table_column_03]."' AND ".$table_column_02." = '".$group_01[$table_column_02]."' GROUP BY ".$table_column_04;
$group_03_result = mysql_query($group_03_query) or die(mysql_error());
while($group_03 = mysql_fetch_array($group_03_result))
{
$javascript .=' VarGroup4.options[VarGroup4.options.length] = new Option("'.$group_03[$table_column_04].'","'.$group_03[$table_column_04].'");'."\r\n";
}
$javascript .=' document.getElementById("Group4").disabled = false;
}'."\r\n";
}
}
$javascript .=<<<content
}
window.onload = CheckGroup1Select;
/* Linked Dropdown Selects Script End */
content;
} // End of quad_linked_selects function
?>
<?
// Call the quad_linked_selects function
quad_linked_selects('tablename','tablecolumn1','tablecolumn2','tablecolumn3','tablecolumn4','Select...','------------','------------');
?>
<html>
<head>
<title>Triple Linked Selects</title>
<script type="text/javascript" language="JavaScript">
<? echo $javascript; ?>
</script>
</head>
<body>
<form action="">
Group1:
<br>
<select id="Group1" name="Group1" onchange="CheckGroup1Select(this);">
<option value="">Select...</option>
<? echo $group_01_options; ?>
</select>
<br>
Group2:
<br>
<select id="Group2" name="Group2" onchange="CheckGroup2Select(this);"></select>
<br>
Group3:
<br>
<select id="Group3" name="Group3" onchange="CheckGroup3Select(this);"></select>
<br>
Group4:
<br>
<select id="Group4" name="Group4"></select>
</form>
</body>
</html>