通过php中的单选按钮onclick处理程序更新mysql中的标志

Question

I want to update a column in a table in mysql. Basically the column is the flag for the entries of that db table.

The modification of the column is resetting all values to 0 and setting the desired row to 1, for this reason I have post.php file which looks like

<?php
require_once('class.uuid.php');

$connection = mysql_connect("---logindetailshere---");
$db = mysql_select_db("---dbnamehere---",$connection);

switch($_REQUEST['action']){
    case ...
        break;
    case ...
            break;
    case 'changeDisp':
        changeDisp($_REQUEST['uid']);
        break;
}

mysql_close($connection);

...

function changeDisp($uid){
    global $connection, $db;
    $q_string = "UPDATE Questions SET Displayed = 0";
    $query = mysql_query($q_string,$connection) or die( sendError(mysql_error() . '<br/><br/>' . $q_string) );
    $q_string = "UPDATE Questions SET Displayed = 1 WHERE Uid='${uid}'";
    $query = mysql_query($q_string,$connection) or die( sendError(mysql_error() . '<br/><br/>' . $q_string) );
}

?>

on the webpage I display the items and radiobuttons next to the items, the purpose is to select the radiobuttons and post to set the flag 1 for the selected item, for this reason I have a item.php file

    <?php
        $i = 1;
        foreach ($qitem as &$q) {
            $options = explode(";", $q["Options"]);
            $displayed = '';
            if ($q["Displayed"] == 1) { $displayed='checked="yes"'; }

            echo("<div class='item' name='".$q["iUid"]."'>");
            echo("<div class='count'>".$i.".</div>");
            echo ("<div class='radio'><input type='radio' onclick='changeDisp(&#34;".$q["Uid"]."&#34;)' name='disp' ".$displayed."></div>");
            echo("<div class='left'>");
            echo("<h4>".$q["Value"]."</h4>");
            echo("<div class='details'>Typ: ".$q["Type"]."</div>");
            echo("<div class='details'>Skala: ".$options[0]." / ".$options[1]."</div>");
            echo("</div>");
            echo("</div>");
            $i++;
        }   
    ?>

here I am using radiobuttons to select the related item, I checked the unique id values using firebug the values are fine, I just want to click on any radiobutton and want to trigger the onclick=changeDisp() function.

I have no idea why the page doesn't reload itself and change the selected flag to 1. Could you please help me to solve this problem?

Thanks in advance.

Answer 1

You cannot use an onclick function to call php function without going there with a javascript, jQuery or ajax call. You could create an ajax script to call the post.php From the item.php page and return the results to you.

Here is an example of creating the function you want. This assumes that $uid is coming from a radio button and not an actual user input. If the user can directly input something you need to use a prepared statment

 function changeDisp($uid)
{
$Mysqli = new mysqli(DB_HOST, DB_USERNAME, DB_PASSWORD, DB_NAME);
    if ($Mysqli->connect_errno)
    {
        echo "Failed to connect to MySQL: (" . $Mysqli->connect_errno . ") " . $Mysqli->connect_error;
        $Mysqli->close();
    }           
    $query = "UPDATE Questions SET Displayed = 1 WHERE Uid='".$uid."'";     
    $update = $Mysqli->query($query);
    if($update)
    {
        return true;
    }
    return false;
}