question about how to populating a SUB drop down from an other one with PHP code

scaleautostyle · October 6, 2010

Hi!! the question look simple at his base because I will receive TONS of answer saying ... " hey men use javascript OR ajax " but I don't want to use these... I want to populate the second dropdown menu dynamicly with PHP code. and sql query.

why?? because I have over 43000 possibility and doing a script manually is impossible. the database is changing every hour.

this is the code of my working page.

the form

NOTE: i REMOVE ALL DB CONNECTION FOR SECURITY PURPOSE. THANKS FOR YOUR UNDERTANDING.

<!doctype html public "-//w3c//dtd html 3.2//en">

<html>

<head>
<title>(Type a title for your page here)</title>
</head>

<body >
<img src="http://www.scale24-25.com/images/banners/banner.jpg" alt="banner" width="997" height="213" border="0" usemap="#Map" />
<map name="Map" id="Map">
<area shape="poly" coords="0,100,85,102,92,55,108,50,326,51,323,7,3,3" href="http://www.hobby-shop.qc.ca" alt="hobby-shop" />
<area shape="poly" coords="672,57,891,53,887,4,995,4,985,108,673,102" href="http://www.hobby-shop.qc.ca" alt="hobby-shop" />
<area shape="poly" coords="326,13,330,53,98,54,90,92,670,99,668,54,889,51,886,5" href="http://www.scale-auto-style.com" alt="" />
</map>
<?php

if (isset($_POST['todo']) && $_POST['todo'] == "search") {    $todo=$_POST['todo'];

$manufacturer_reel=$_POST['manufacturer_reel'];

$query="select * from kit where  ";

////////// Including manufacturer_reel field search ////
if(strlen($manufacturer_reel) > 0 ){
$query.= " manufacturer_reel='$manufacturer_reel' and "; 
}  
//// End of class field search ///////////

$query=substr($query,0,(strLen($query)-4));

echo $query;
echo "<br><br>";
$nt=mysql_query($query);
echo mysql_error();

// End if form submitted



}else{

echo "<form method=post action='search-keyword.php?go'><input type=hidden name=todo value=search>";
?>
<table width="960" border="0">
  <tr>
    <td colspan="3"><p align="center"></td>
  </tr>
  <tr>
    <td><div align="right"></div></td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><div align="right">Echelle du modele</div></td>
    <td align="center">
<?php 
//  strat of drop down  ///
$q=mysql_query("SELECT DISTINCT scale FROM kit ORDER BY scale");
echo '<select name="scale"><option value="scale">Please Choose an Option</option>';
while($row = mysql_fetch_array($q)) {
$thing = $row['scale'];
echo '<option>'.$thing.'</option>';
}
echo "</select>";

echo " <br> \n";
echo " <br> \n";

?></td>
    <td><div align="left">Scale of model</div></td>
  </tr>
  <tr>
    <td> </td>
    <td> </td>
    <td><div align="right"></div></td>
  </tr>
  <tr>
    <td><div align="right">Nom du manufacturier automobile</div></td>
    <td align="center"><?php
//  strat of drop down  ///
$q=mysql_query("SELECT DISTINCT manufacturer_reel FROM kit ORDER BY manufacturer_reel");
echo '<select name="manufacturer_reel"><option value="reel manufacturer">Please Choose an Option</option>';
while($row = mysql_fetch_array($q)) {
$thing = $row['manufacturer_reel'];
echo '<option>'.$thing.'</option>';
}
echo "</select>";
//  end of drop down  ///
echo " <br> \n";
echo " <br> \n";
//  end of drop down  ///

?></td>
    <td><div align="left">Name Of vehicule manufacturer</div></td>
  </tr>
  <tr>
    <td> </td>
    <td> </td>
    <td><div align="right"></div></td>
  </tr>
  <tr>
    <td><div align="right">Nom du manufacturier de modele reduit</div></td>
    <td align="center"><?php
//  start of drop down  ///
$q=mysql_query("SELECT DISTINCT manufacturer_kit FROM kit ORDER BY manufacturer_kit");
echo '<select name="manufacturer_kit"><option value="kit manufacturer">Please Choose an Option</option>';
while($row = mysql_fetch_array($q)) {
$thing = $row['manufacturer_kit'];
echo '<option>'.$thing.'</option>';
}
echo "</select>";

//  end of drop down  ///
echo " <br> \n";
echo " <br> \n";

?></td>
    <td><div align="left">Name Of kit manufacturer</div></td>
  </tr>
  <tr>
    <td><div align="right"></div></td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td><div align="right">Annee de fabrication du Vehicule</div></td>
    <td align="center"><?php
//  strat of drop down  ///
$q=mysql_query("SELECT DISTINCT year_prod_reel FROM kit ORDER BY year_prod_reel");
echo '<select name="year_prod_reel"><option value="vehicules year manufactured">Please Choose an Option</option>';
while($row = mysql_fetch_array($q)) {
$thing = $row['year_prod_reel'];
echo '<option>'.$thing.'</option>';
}
echo "</select>";
//  end of drop down  ///
echo " <br> \n";
echo " <br> \n";

?></td>
    <td><div align="left">Year of production of the vehicule</div></td>
  </tr>
  <tr>
    <td> </td>
    <td> </td>
    <td> </td>
  </tr>
  <tr>
    <td> </td>
    <td align="center"> </td>
    <td> </td>
  </tr>
  <tr>
    <td><div align="right"><strong></strong></div></td>
    <td align="center">
<?php

echo "
<br><input type=submit value=Search name='name' action='search-keyword.php?go' >
</form>
";
}


?>
<td><div align="left"><strong></strong></div></td>






</body>

</html>

AND THE PAGE RESULT

<!doctype html public "-//w3c//dtd html 3.2//en">

<html>

<head>
<title>(Type a title for your page here)</title>

</head>

<body >
<p align="center"><img src="http://www.scale24-25.com/catalog/images/banners/banner.jpg" alt="banner" width="997" height="213" border="0" usemap="#Map" />
<map name="Map" id="Map">
<area shape="poly" coords="0,100,85,102,92,55,108,50,326,51,323,7,3,3" href="http://www.hobby-shop.qc.ca" alt="hobby-shop" />
<area shape="poly" coords="672,57,891,53,887,4,995,4,985,108,673,102" href="http://www.hobby-shop.qc.ca" alt="hobby-shop" />
<area shape="poly" coords="325,11,329,51,97,52,89,90,669,97,667,52,888,49,885,3" href="http://www.scale-auto-style.com" alt="" />
</map></p>
<table width="920" border="0">
  <tr>
    <td width="359"><p class="style5">You will find some TBC. TBC is for "To Be Confirmed". If somebody know the missing information ( TBC ) it will be appreciate to send it to me at this mail: <a href="mailto:[email protected]">[email protected]</a> <br />
        <br />
thanks in advance for your help</p>
    </td>
    <td width="161"> </td>
    <td width="386"> <div align="right">
      <p>This logo <img  src= 'http://www.scale24-25.com/images/PDF_logo.gif' width='50' height='50'/> mean that you can download a PDF file. To read it you need minimum Acrobat reader and you can download it <a href="http://get.adobe.com/reader/">here</a></p>
      <p>Some link will return a TBC. Sorry for any inconveniant. as soon as we will receive or do the PDF it will be updated.</p>
    </div></td>
  </tr>
</table>


<br>







<?php
if (isset($_POST['todo']) && $_POST['todo'] == "search") {    $todo=$_POST['todo'];

$name=$_POST['manufacturer_reel'];
$name1=$_POST['manufacturer_kit'];
$name2=$_POST['year_prod_reel'];
$name3=$_POST['scale'];


//-query  the database table for the post field  

$sql="SELECT  kit_id, kit_number, kit_name, description, manufacturer_kit, manufacturer_reel, scale, engine_detail, year_prod_kit, year_prod_reel, image_id, image_id1, image_id2  FROM kit ";
    $sqlOperand="WHERE";
    if ($name != "reel manufacturer") {
        $sql = $sql . $sqlOperand . " manufacturer_reel LIKE '%" . $name ."%' ";
        $sqlOperand = " AND ";
    }
    if ($name1 != "kit manufacturer") {
        $sql = $sql . $sqlOperand . " manufacturer_kit LIKE '%" . $name1 ."%' ";
        $sqlOperand = " AND ";
    }
    if ($name2 != "vehicules year manufactured") {
        $sql = $sql . $sqlOperand . " year_prod_reel LIKE '%" . $name2 ."%' ";
        $sqlOperand = " AND ";
    }
    if ($name3 != "scale") {
        $sql = $sql . $sqlOperand . " scale LIKE '%" . $name3 ."%' ";
        $sqlOperand = " AND ";
    }
    if ($sqlOperand == "WHERE") {
           echo  "<p>Please enter a search query</p>";   
    } 

else {
   //   echo '<img src="web-design/sorry.jpg" alt="sorry">';
       	
       // echo "Sorry nothing match your selection / Desolle rien ne correspond a votre selection";
   // echo "run sql: <BR> $sql <BR> and display results";
    }



  //-run  the query against the mysql query function   
   $result=mysql_query($sql);  
   
  //-make the header of the table   
   
   echo "  <table align=center width=\"1340\" border=\"\">\n";
   echo "    <tr>\n";
   echo"  <td nowrap align=center width='95'>  kit manufacturer  \n";		
   echo"  <td nowrap align=center width='55'>	scale \n";		
   echo"  <td nowrap align=center width='90'>	kit number \n";		
   echo"  <td nowrap align=center width='290'>	kit name \n";		
   echo"  <td nowrap align=center width='400'>	description \n";
   echo"  <td nowrap align=center width='125'>	vehicule year \n";		
   echo"  <td nowrap align=center width='80'>	complete engine detail\n";		
   echo"  <td nowrap align=center width='80'>	Select Picture to get bigger\n";
   echo"  <td nowrap align=center width='75'>	instruction sheet\n";
   echo"  <td nowrap align=center width='75'>	box contain\n";
   echo "    <tr>\n";

   //-create  while loop and loop through result set   
   while($row=mysql_fetch_array($result)){   
         $description  =$row['description'];   
         $manufacturer_kit=$row['manufacturer_kit']; 
	 $scale=$row['scale']; 
	 $manufacturer_reel=$row['manufacturer_reel'];   
         $kit_id=$row['kit_id']; 
	 $kit_number=$row['kit_number'];
	 $kit_name=$row['kit_name'];
	 $engine_detail=$row['engine_detail'];
	 $year_prod_reel=$row['year_prod_reel'];
	 $image_id=$row['image_id'];
	 $image_id1=$row['image_id1'];
	 $image_id2=$row['image_id2'];


	   
   //-create  table of item during he while loop
   
echo "  <table align=center width=\"1340\" border=\"\">\n";		   
echo"  <td nowrap align=center width='95'>  $manufacturer_kit  \n";	
echo"  <td nowrap align=center width='55'>  $scale  \n";
echo"  <td nowrap align=center width='90'>	$kit_number \n";		
echo"  <td nowrap align=center width='290'>	$kit_name \n";		
echo"  <td nowrap width='400'>	$description \n";
echo"  <td nowrap align=center width='125'>	$year_prod_reel \n";		
echo"  <td nowrap align=center width='80'>	$engine_detail \n";	
echo"  <td nowrap width='80'> <a href=".$image_id.">   <img src='".$image_id."' width='75' height='50' border='0'/>";
echo"  <td nowrap width='75'> <a href= ".$image_id1.">   <img src= 'http://www.scale24-25.com/images/PDF_logo.gif' width='50' height='50' border='0'/>";
echo"  <td nowrap width='75'> <a href=".$image_id2.">   <img src='http://www.scale24-25.com/images/PDF_logo.gif' width='50' height='50' border='0'/>";
echo "    </tr>\n";
echo "    </table>\n"; 
echo "    </tr>\n";
echo "    </table>\n";


   }   
   }  
   else{   
   echo  "<p>Please enter a search query</p>";   
   }   
   
?>  


  



</body>

</html>

YOU CAN SEE IN THE FORM i HAVE A DROP DOWN MENU CALL Name Of vehicule manufacturer .. IN VACT THIS IS THE REAL CAR MANUFACTURER EX: TOYOTA, gmc ETC.. WHEN THE USER WILL SELECT ONE OF THESE AN OTHER DROPDOWN ( NOT SHOWN ) WILL DISPLAY EVERY MODEL FOUND IN THE DATABASE IN RELATION WITH THE MANUFACTURE. IN FACT IT'S LOCATED IN THE TABLE.

SO HOW I CAN GET THIS RELATION??

YOURS

SEBASTIEN

BlueSkyIS · October 6, 2010

if you want to populate the second dropdown dynamically using PHP, you have 2 practical choices: 1. Ajax (Javacript calling PHP on the server and updating the dropdown without a page refresh), or 2. submit the form on the onchange() event of the first dropdown and have PHP rebuild the page with the updated content.

Option 1 and 2 have the same practical result (dealing with bots is the sand in the vaseline), but option 1 doesn't require a page refresh.

Psycho · October 6, 2010

Just to second what BlueSkyIS stated, you state you want to update the second select list dynamically. You should know that once a page is delivered to the browser PHP has no way of interacting with the page by itself. You either need to utilize JavaScript (which can initiate a PHP call) or you can have the user make a selection from the primary drop-down and manually submit the page. AJAX IS the solution you are looking for - you just don't know it.

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question about how to populating a SUB drop down from an other one with PHP code

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