Question

...
success: function (reqCode) {
            if (reqCode['error_code'] == 1) {
                //Generiere Tabelle     
                $(".done").html( 
                    '<p class="bold center"><?php echo "Besucher ".$month_name[' + reqCode['month'] + ']." ".' + reqCode['year'] + '; ?></p>'
                    '<canvas id="cvs" width="680" height="250">[No canvas support]</canvas>'
                    '<script>'
                        'chart = new RGraph.Line("cvs", ' + reqCode['data_string'] + ');'
                        'chart.Set("chart.tooltips", ' + reqCode['labels_string'] + ');'
                        'chart.Set("chart.tooltips.effect", "expand");'
                        'chart.Set("chart.background.grid.autofit", true);'
                        'chart.Set("chart.gutter.left", 35);'
                        'chart.Set("chart.gutter.right", 5);' 
                        'chart.Set("chart.hmargin", 10);' +
                        'chart.Set("chart.tickmarks", "circle");'
                        'chart.Set("chart.labels", ' + $reqCode['labels_tooltip'] + ');'
                        'chart.Draw();'
                    '</script>'
                );      
                $('.done').fadeOut('slow'); 
                $('.done').fadeIn('slow');
            }   
}   

I don’t know why every new line needs its own ‘..’. Anyway it’s not working. Looked into the API reference but found nothing useful 🙁

Edit: For my second question:

This is what JSON response:

$response['error_code'] = '1'; 
    $response['data_string'] = "[" . join(", ", $data) . "]";
    $response['labels_string'] = "['" . join("', '", $labels) . "']";
    $response['labels_tooltip'] = "['" . join("', '", $data) . "']";
    $response['month'] = $month_name[$month];
    $response['year'] = $year;

    echo json_encode($response);

Answer 1

There does seem to be something wrong with that <script> tag, but really? You don’t need to insert that <script> tag. You’re already running JavaScript; just do this:

success: function (reqCode) {
    if (reqCode['error_code'] == 1) {
        var month_name = <?php echo json_encode($month_name); ?>;
        //Generiere Tabelle     
        $(".done").html( 
            '<p class="bold center">Besucher ' + month_name[reqCode['month']] + ' ' + reqCode['year'] + '</p>'+
            '<canvas id="cvs" width="680" height="250">[No canvas support]</canvas>'
        );

        var chart = new RGraph.Line("cvs", reqCode['data_string']);
        chart.Set("chart.tooltips", reqCode['labels_string']);
        chart.Set("chart.tooltips.effect", "expand");
        chart.Set("chart.background.grid.autofit", true);
        chart.Set("chart.gutter.left", 35);
        chart.Set("chart.gutter.right", 5); 
        chart.Set("chart.hmargin", 10);
        chart.Set("chart.tickmarks", "circle");
        chart.Set("chart.labels", reqCode['labels_tooltip']);
        chart.Draw();

        $('.done').fadeOut('slow'); 
        $('.done').fadeIn('slow');
    }   
}   

I’ve fixed some syntax errors in there, though I can’t guarantee that there are none left. Just watch the JavaScript console for errors.