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Thread: Populating a combo box from another combo box

  1. #1
    Join Date
    Mar 2010
    Posts
    13

    Populating a combo box from another combo box

    Hi,

    I am using javascript to populate a number of text boxes based on the data item selected in the 1st combo box.

    I am now working on making the selection of that combo box populate another combo box with items from another table. I can hard the sql code for the 2nd combo box so that when I select an option it populates more text boxes, but want the contents of the 2nd combo box to dynamically change depending on the selection of the 1st box. I would like this to do it without refreshing the page after each 1st combo box selection.

    any help would be massively appreciated as I been stuck on this for a while. The 2nd box does not populate with the below code as I guess the variable isn't populated, I can put '1' in and it selects products with that prodid, but as explained above i'd like it to read the prodid from the 1st combo box.

    Code:
    <?php
    require "session_logincheck.php";
    
    function selectProductAndPopulate()
    {
        require "product_details.php";
        require "connect.php";
    ?>
    <html>
    <script type="text/javascript">
    	var prodDetailsArray = new Array();
            var prodSpecificDetailsArray = new Array();
    
    
    
    	<?php
    		$selectProductQuery = "SELECT * FROM product ORDER BY prodname";
    		$selectProductResult = mysql_query($selectProductQuery) or die(mysql_error());
    
    
    		// build javascript array
    		while ($prodrow1=mysql_fetch_array($selectProductResult))
    
                        {
    
                            echo 'prodDetailsArray['.$prodrow1['prodid'].'] = new Array();';
    			echo 'prodDetailsArray['.$prodrow1['prodid'].']["prodcompid"] = "'.$prodrow1['prodcompid'].'";';
                            echo 'prodDetailsArray['.$prodrow1['prodid'].']["prodcode"] = "'.$prodrow1['prodcode'].'";';
                            echo 'prodDetailsArray['.$prodrow1['prodid'].']["prodname"] = "'.$prodrow1['prodname'].'";';
                            echo 'prodDetailsArray['.$prodrow1['prodid'].']["prodcategory"] = "'.$prodrow1['prodcategory'].'";';
                            echo 'prodDetailsArray['.$prodrow1['prodid'].']["produnitprice"] = "'.$prodrow1['produnitprice'].'";';
                            echo 'prodDetailsArray['.$prodrow1['prodid'].']["prodphoto"] = "'.$prodrow1['prodphoto'].'";';
                            echo 'prodDetailsArray['.$prodrow1['prodid'].']["proddescription"] = "'.$prodrow1['proddescription'].'";';
    
    		}
    
                    $selectProductDetailsQuery = "SELECT * FROM productdetail ORDER BY proddetfield";
    		$selectProductDetailsResult = mysql_query($selectProductDetailsQuery) or die(mysql_error());
    
    
    		// build javascript array
    		while ($proddetrow1=mysql_fetch_array($selectProductDetailsResult))
    
                        {
    
                            echo 'prodSpecificDetailsArray['.$proddetrow1['proddetid'].'] = new Array();';
    			echo 'prodSpecificDetailsArray['.$proddetrow1['proddetid'].']["proddetvalue"] = "'.$proddetrow1['proddetvalue'].'";';
    
    
    		}
    
    
    	?>
    
    	function showProductName() {
    		var prodid = document.prodform.prodid.value;
    		document.prodform.prodcompid.value = prodDetailsArray[prodid]["prodcompid"];
                    document.prodform.prodcode.value = prodDetailsArray[prodid]["prodcode"];
    		document.prodform.prodname.value = prodDetailsArray[prodid]["prodname"];
                    document.prodform.prodcategory.value = prodDetailsArray[prodid]["prodcategory"];
                    document.prodform.produnitprice.value = prodDetailsArray[prodid]["produnitprice"];
                    document.prodform.prodphoto.value = prodDetailsArray[prodid]["prodphoto"];
                    document.prodform.proddescription.value = prodDetailsArray[prodid]["proddescription"];
                   
                          
    
    	}
    
            function showProductSpecName() {
    		var proddetid = document.prodform.proddetid.value;
    		document.prodform.editproddetvalue.value = prodSpecificDetailsArray[proddetid]["proddetvalue"];
            }
           
    
    	window.onload=function() {
    		showProductName();
                    //showProductSpecName();
    
    	}
    
    </script>
    
    
    <form name="prodform">
        <div id="topl">
            <div class ="toplpost">
                <h1 class="title"> Select a product </h1>
                <div class="entry">
                    <select name="prodid" onchange="showProductName()">
                    <?php
                    $selectProductQuery = "SELECT * FROM product where userid = '".$_SESSION['userid']."' ORDER BY prodname";
                    $selectProductResult = mysql_query($selectProductQuery) or die(mysql_error());
                    
                    while($prodrow1=mysql_fetch_array($selectProductResult))
                    {
                        echo '<option value="'.$prodrow1['prodid'].'">'.$prodrow1['prodname'].'</option>';
                        $productID = $prodrow1['prodid'];
                    } ?>
    		</select>
                </div>
            </div>
        </div>
        
        <div id="topm">
            <div class ="topmpost">
                <h1 class="title"> Select a product detail </h1>
                <div class="entry">
                    <select name="proddetid" onchange="showProductSpecName()">
                    <?php
                    $selectProductDetailsQuery = "SELECT * FROM productdetail where prodid = '".$productID."' ORDER BY proddetfield";
                    $selectProductDetailsResult = mysql_query($selectProductDetailsQuery) or die(mysql_error());
                    
                    while($proddetrow1=mysql_fetch_array($selectProductDetailsResult))
                    {
                        echo '<option value="'.$proddetrow1['proddetid'].'">'.$proddetrow1['proddetfield'].'</option>';
                    } ?>
                    </select>
                </div>
            </div>
        </div>
                    <?php productDetails(); ?>
    </form>
    </html>
    <?php
    
    }?>

  2. #2
    Join Date
    Apr 2003
    Location
    Netherlands
    Posts
    21,654
    Is this the sort of thing you want to achieve?
    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
       "http://www.w3.org/TR/html4/strict.dtd">
    <html lang="en">
    <head>
    <title>select change 2nd select</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    <script type="text/javascript">
    var varieties=[
    ["varieties","granny smith","golden delicious","jonathan"],
    ["varieties","anjou","bartlett","conference"],
    ["varieties","valencia","pineapple","pera"]
    ];
    
    function Box2(idx) {
    var f=document.myform;
    f.box2.options.length=null;
    for(var i=0; i<varieties[idx].length; i++) {
    	f.box2.options[i]=new Option(varieties[idx][i], varieties[idx][i]); 
        }    
    }
    
    window.onload=function() {
    var f=document.myform;
    var box1=f.box1;
    box1.onchange=function(){Box2(this.selectedIndex);};
    // create 2nd select
    try { // IE
      var sel=document.createElement("<select name=\"box2\"><\/select>");
      }
    catch(e) {
      var sel=document.createElement("select");
      sel.name = "box2";
      }
    f.getElementsByTagName('fieldset')[0].insertBefore(sel, box1.nextSibling);
    // fill 2nd select
    Box2(0);
    // re-direct
    f.onsubmit=function() {location.href=f.getElementsByTagName('legend')[0].innerHTML+'/'+f.box1.options[f.box1.selectedIndex].value+'/'+f.box2.options[f.box2.selectedIndex].value+'.html'; return false;};
    }
    </script>
    
    </head>
    <body>
    <form name="myform" method="post" action="http://www.mysite.com/mysite">
    <fieldset><legend>fruit</legend>
    <select name="box1">
        <option value="apple">apple</option>
        <option value="pear">pear</option>
        <option value="orange">orange</option>
    </select>
    <button type="submit">submit</button>
    </fieldset>
    </form>
    </body>
    </html>
    If the dropdowns have a large number of entries then there are Ajax solutions which would be more appropriate.
    At least 98% of internet users' DNA is identical to that of chimpanzees

  3. #3
    Join Date
    Mar 2010
    Posts
    13
    Quote Originally Posted by Fang View Post
    Is this the sort of thing you want to achieve?
    Code:
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
       "http://www.w3.org/TR/html4/strict.dtd">
    <html lang="en">
    <head>
    <title>select change 2nd select</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    <script type="text/javascript">
    var varieties=[
    ["varieties","granny smith","golden delicious","jonathan"],
    ["varieties","anjou","bartlett","conference"],
    ["varieties","valencia","pineapple","pera"]
    ];
    
    function Box2(idx) {
    var f=document.myform;
    f.box2.options.length=null;
    for(var i=0; i<varieties[idx].length; i++) {
    	f.box2.options[i]=new Option(varieties[idx][i], varieties[idx][i]); 
        }    
    }
    
    window.onload=function() {
    var f=document.myform;
    var box1=f.box1;
    box1.onchange=function(){Box2(this.selectedIndex);};
    // create 2nd select
    try { // IE
      var sel=document.createElement("<select name=\"box2\"><\/select>");
      }
    catch(e) {
      var sel=document.createElement("select");
      sel.name = "box2";
      }
    f.getElementsByTagName('fieldset')[0].insertBefore(sel, box1.nextSibling);
    // fill 2nd select
    Box2(0);
    // re-direct
    f.onsubmit=function() {location.href=f.getElementsByTagName('legend')[0].innerHTML+'/'+f.box1.options[f.box1.selectedIndex].value+'/'+f.box2.options[f.box2.selectedIndex].value+'.html'; return false;};
    }
    </script>
    
    </head>
    <body>
    <form name="myform" method="post" action="http://www.mysite.com/mysite">
    <fieldset><legend>fruit</legend>
    <select name="box1">
        <option value="apple">apple</option>
        <option value="pear">pear</option>
        <option value="orange">orange</option>
    </select>
    <button type="submit">submit</button>
    </fieldset>
    </form>
    </body>
    </html>
    If the dropdowns have a large number of entries then there are Ajax solutions which would be more appropriate.
    Hi, that is the sort of functionality I want to achieve but I don't know how I can translate that into my code as I'm reading from a database :s

    If you could guide me or have an example of this functionality when reading from a database with two tables I would be forever in your debt.

    In the mean time I will try and decipher how this works so I build my knowledge

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