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php dropdown from mysql city state group

Posted on 2013-10-23
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Medium Priority
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1,147 Views
Last Modified: 2013-10-24
im trying to set the group option in a select box to a state and list all the cities in that group of states, and its not working as expected

current code
include ("../mysqli_ctx.php");
$path="../";
$result1 = mysqli_query($mysqli,"SELECT id, state,city FROM current_loc ORDER BY state");

//echo "<pre>";print_r($result); echo "<pre>";
while($row1 = $result1->fetch_row()) {
  $rows1[]=$row1;
}

echo "<pre>";print_r($rows1); echo "</pre>";


$result = mysqli_query($mysqli,"SELECT id, city, state FROM current_loc ORDER BY state");
echo '<select style="width:300px" id="source">';
$grp_flag= TRUE;
$last_state="";
while($row = mysqli_fetch_array($result))
{
  // show here
        if ($grp_flag == TRUE) {
            echo '<optgroup label="'.$row['state'].'">'."\n";
            $grp_flag=FALSE;
        }
 
  foreach ($row as $city => $state) {
          if ($state == $row['state']) { 
          echo '<option value="' .$row['id'] . '">' . $row['city'] . '</option>'."\n";
          }
          else {
            echo "</optgroup>"."\n";
            echo '<optgroup label="'.$row['state'].'">'."\n";
          }
     }
}
echo ' </select>';


/**
 *
 * @todo       do
 * @date       The current date is: Wed 10/23/2013 
Enter the new date: (mm-dd-yy)  *
 */


?>
<select style="width:300px" id="source">
    <optgroup label="IL">
        <option value=" "="">Champaign</optgroup>
    </optgroup>
    <optgroup label="MA">
        <option value="">Boston</option>
    </optgroup>
    <optgroup label="OH">
        <option value="">Springfield</option>
    </optgroup>
</select>

Open in new window


current output
<select style="width:300px" id="source"><optgroup label="IL">
</optgroup>
<optgroup label="IL">
</optgroup>
<optgroup label="IL">
</optgroup>
<optgroup label="IL">
</optgroup>
<optgroup label="IL">
<option value="2">Chicago</option>
<option value="2">Chicago</option>
</optgroup>
<optgroup label="IL">
</optgroup>
<optgroup label="IL">
</optgroup>
<optgroup label="IL">
</optgroup>
<optgroup label="IL">
<option value="5">Champaign</option>
<option value="5">Champaign</option>
</optgroup>
<optgroup label="MA">
</optgroup>
<optgroup label="MA">
</optgroup>
<optgroup label="MA">
</optgroup>
<optgroup label="MA">
<option value="1">Boston</option>
<option value="1">Boston</option>
</optgroup>
<optgroup label="OH">
</optgroup>
<optgroup label="OH">
</optgroup>
<optgroup label="OH">
</optgroup>
<optgroup label="OH">
<option value="3">Columbus</option>
<option value="3">Columbus</option>
</optgroup>
<optgroup label="OH">
</optgroup>
<optgroup label="OH">
</optgroup>
<optgroup label="OH">
</optgroup>
<optgroup label="OH">
<option value="4">Springfield</option>
<option value="4">Springfield</option>
 </optgroup></select>

Open in new window


should be similar to this
<select style="width:300px" id="source">
    <optgroup label="IL">
        <option value"="0">Champaign</option>
        <option value"="5">Chicago</option>
   </optgroup>
    
    <optgroup label="MA">
        <option value="1">Boston</option>
    </optgroup>
    <optgroup label="OH">
        <option value="2">Springfield</option>
    </optgroup>
</select>

Open in new window


and ideas where my code is wrong please
thank you In Advance for any code or help you may provide
0
Comment
Question by:Johnny
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5 Comments
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 39597163
I'll take a look at this, but while I'm doing that, you might want to read this article about how to use MySQLi, including query error handling.  I think you would find the OO version of MySQLi to have easier syntax.  And fetch_array() is an AntiPattern because of poor performance.
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/PHP_Databases/A_11177-PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html
0
 
LVL 111

Accepted Solution

by:
Ray Paseur earned 2000 total points
ID: 39597243
Obviously this is untested code, but it should be correct in principle.  The select control is built in a variable called $out, which can be included in the HTML output template or echo'ed into the browser output stream at the appropriate moment.

include ("../mysqli_ctx.php");
$path="../";

// CREATE QUERY STRING
$sql = "SELECT id, city, state FROM current_loc ORDER BY state, city";

// RUN QUERY
$result = mysqli_query($mysqli, $sql);
/**
 * TEST FOR QUERY SUCCESS HERE, POSSIBLY TRIGGER_ERROR()
 */

// START THE SELECT CONTROL
$out = '<select style="width:300px" id="source">' . PHP_EOL;

// THE CURRENT STATE IS KEPT HERE
$old = '?';

// THE INITIAL OPTGROUP STATUS IS KEPT HERE
$grp = FALSE;

// USE AN ITERATOR TO RETRIEVE THE ROWS OF THE RESULTS SET
while($row = mysqli_fetch_object($result))
{
    // IF THIS IS A ROW WITH A NEW STATE?
    if ($row->state != $old)
    {
        // IF THERE IS AN EXISTING OPT-GROUP
        if ($grp)
        {
            // TIE OFF THE OLD OPT-GROUP
            $out .= '</optgroup>' . PHP_EOL;
        }
        
        // ADD THE OPT-GROUP FOR THE NEW STATE
        $out .= '<optgroup label="' . $row->state . '">' . PHP_EOL;
        $out .= '<option value="' . $row->id . '">' . $row->city . '</option>' . PHP_EOL;
        
        // CHANGE STATES
        $old = $row->state;
        $grp = TRUE;
    }
    // IF THIS IS ANOTHER CITY IN THE SAME STATE
    else
    {
        // JUST ADD THE CITY OPTION
        $out .= '<option value="' . $row->id . '">' . $row->city . '</option>' . PHP_EOL;
    }
}
// AT THE END OF THE RESULTS SET, TIE OFF THE OPT-GROUP AND THE SELECT CONTROL
$out .= '</optgroup>' . PHP_EOL;
$out .= '</select>' . PHP_EOL;

Open in new window

HTH, ~Ray
0
 

Author Closing Comment

by:Johnny
ID: 39597944
Thank you ray as always i love your comments and code examples
now to figure out how to add images to the optgroup for state flags
0
 
LVL 111

Expert Comment

by:Ray Paseur
ID: 39597969
Images for state flags... Interesting!  Hope you'll post a question about that here at EE.

Thanks for the points and best of luck with the project, ~Ray
0
 

Author Comment

by:Johnny
ID: 39598100
heres the question for icon before select optgroup in a pulldown
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28276353.html
0

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