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03.26.2008 at 07:11AM PDT, ID: 23270412
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7.8

URGENT: Dependent Drop Down

Asked by pertrai1 in PHP and Databases, PHP Scripting Language

Tags:

EE, I am very desperate to figure out why I can't get this to work. I need to have a dependent drop down that will show the categories in the second drop box depending on what parent category is chosen in the main drop down. Here is where I am having problems. I originally set up my table in mysql to hold one subcategory. Now I need to have a subcategory hold a subcategory. I don't know if this is a problem with my current table:

cat_id int(11)
cat_name varchar(30)
cat_parent int(11) default '0'

If it is a main parent category then it is given the value 0 for cat_parent. If it is a subcategory then the cat_parent is the cat_id of the parent. How can I do this with adding a second subcategory and have the stupid drop downs work. This is getting frustrated because I am trying to learn but the curve it hard. The code I have attached works in getting the parent category and the subcategory. But if the parent is a subcategory it will not get the sub category of the sub category. If I have confused you it is because I am confused. Sorry if I have not provided enough for help.

Thank you in advance for help.

RobStart Free Trial 
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<?
$query = "SELECT * FROM tblCategories where cat_parent=0";
if (!($result_main=mysql_query($query))) {
  // query failed. report and ...
  die();
}
$mainid = (integer)$_GET['cat_id'];
if ($mainid > 0) {
  $mainid = mysql_real_escape_string($mainid);
  $query = "SELECT * FROM tblCategories WHERE cat_parent='$mainid'";
  if (!($result_sub=mysql_query($query))) {
    // query failed. report and ...
    die();
  }
} else { $result_sub = false; }
?>
 
                      <td>Main Category:</td>
                      <td align="left"><select name="cat_parent" class="inputbox" id="cat_parent">
                        <?
  while ($row=mysql_fetch_assoc($result_main)) {
    echo "<option value=\"{$row['cat_id']}\"",
        (($row['cat_id']==$mainid)?" selected=\"selected\"":''),
        ">{$row['cat_name']}</option>\n";
  }
?>
 
                      </select>                      </td>
                    </tr>
                    <tr>
                      <td>Sub Category:</td>
                      <td align="left"><select name="cat_id" class="inputbox" id="cat_id">
                      <?
if (($mainid > 0) && ($result_sub)) {
  while ($row=mysql_fetch_assoc($result_sub)) {
    echo "<option value=\"{$row['cat_id']}\"",
        (($row['cat_id']==$mainid)?" selected=\"selected\"":''),
        ">{$row['cat_name']}</option>\n";
  } 
} 
?>
[+][-]03.26.2008 at 07:49AM PDT, ID: 21212190

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[+][-]03.26.2008 at 08:29AM PDT, ID: 21212673

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About this solution

Zones: PHP and Databases, PHP Scripting Language
Tags: php and databases
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Solution Provided By: Ray_Paseur
Participating Experts: 2
Solution Grade: A
 
 
[+][-]03.26.2008 at 09:27AM PDT, ID: 21213387

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[+][-]03.26.2008 at 12:30PM PDT, ID: 21215268

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[+][-]03.27.2008 at 09:26AM PDT, ID: 21223168

Often, when Experts are collaborating with members who have asked questions, they will request additional information about the problem. Askers respond with an author comment like this one.

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