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Remembering Checkboxes

February 13, 2006

Home> Life with the Preacher > Remembering Checkboxes

Here is an example of remembering checkboxes in php. It was brought on by Make Checkboxes Sticky @ Christian Web Masters. Suggestions welcome.

Example:

Number of Rows to Fetch:

	Title 1	Description of 1
	Title 2	Description of 2
	Title 3	Description of 3
	Title 4	Description of 4
	Title 5	Description of 5
	Title 6	Description of 6
	Title 7	Description of 7
	Title 8	Description of 8
	Title 9	Description of 9
	Title 10	Description of 10

Code:

<?php
/**
* Sets the default number of rows to 10, if rows not set on the form
**/
if (!isset($_POST['rows']))
{
    define("ROWS", 10);
} else {
    define("ROWS", $_POST['rows']);
}
?>
<form method="post">
    <p><label for="rows">Number of Rows to Fetch: </label>
       <input type="text" 
              name="rows"
              value="<?php echo ROWS ?>" />
    </p>
    <table>
<?php

$fakeMySQLResults = fakeMySQLResults(ROWS);

while ($row = fakeMySQLAssoc($fakeMySQLResults)) { 
    $checked = stickifyCheckboxes($row['position_id'], $_POST['applying_for']);
    echo 
'         <tr>
            <td>
              <input type="checkbox" 
                     value="'.$row['position_id'].'" 
                     name="applying_for[]" 
                     '.$checked.' />
            </td>
            <td>
                <b>'.$row['positiontitle'].'</b>
            </td>
            <td>
                '.$row['positiondes'].'
            </td>
         </tr>'."
";
}
?>
    </table>
    <p><input type="submit" /></p>
</form>

<?php 
/**
* Returns checked it the needle $checkboxValue is found in $checkboxArray
**/
function stickifyCheckboxes($checkboxValue, $checkboxArray)
{
    if(!isset($checkboxArray)) {
        return null;
    } else if(in_array($checkboxValue, $checkboxArray)) {
        return 'checked="checked"';
    }
}
       
/**
* Simulates a MySQL query to match the given example
**/
function fakeMySQLResults($numOfRows='10')
{
    for($i=1; $i <= $numOfRows; $i++) {
       
        $fakeMySQLarray[] = array("position_id"   => "$i$i$i$i$i$i",
                                  "positiontitle" => "Title $i",
                                  "positiondes"   => "Description of $i");
    }
    return $fakeMySQLarray;
}

/**
* Simulates retriving a MySQL query result as an array
**/
function fakeMySQLAssoc(&$fakeMySQLResults)
{
    return array_shift($fakeMySQLResults);
}
?>

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