How can i give inline code access to post variable when using AJAX Post?

How do i get the value from the form post that im posting within a plugin I am wanting to retrieve it i thought if i insert the form via short code that the variable on the main page would be carried over but its not maybe I need to add a shortcode that is accessable to the form inline and the insert statement above anyone any ideas.

IE On kids dashbarod page where i implment short code I already have a variable declaired called player id. This is unique to the signed in player. I need to reference that wihtin my plugin form so i can access it through the post variable or is it better using update_options my main concern their is the child could overide it in view source ?.

         wp_register_style( 'ajaxgogreen-style', plugins_url( '/css/modal.css', __FILE__ ), array(), '20120208', 'all' );
  wp_enqueue_style( 'ajaxgogreen-style' );
        // including ajax script in the plugin Myajax.ajaxurl
        wp_localize_script( 'gogreen', 'MyAjax', array( 'ajaxurl' => admin_url( 'admin-ajax.php')));
        function updateRedeemPoints(){
        $playerId = $_POST['playerId'];
        $points=$_POST['points'];
        global $wpdb;
        $wpdb->insert( 
            '4hSIc_pods_player_ranking', 
            array( 
                'points_to_redeem' =>$points,
                'player_id'=>'339393',
                'date_to_be_awarded' => current_time('mysql', 1),
                'approved'=>'false'

            ));


        echo 'test';
        }
        add_action('wp_ajax_updateRedeemPoints', 'updateRedeemPoints');
        add_action('wp_ajax_nopriv_updateRedeemPoints', 'updateRedeemPoints');
                function show_form(){


                    echo "<div id='thanks-modal' class='modal fade' tabindex='-1' role='dialog'  aria-labelledby='myModalLabel' aria-hidden='true'>";
                    echo "<div class='modal-dialog'>";
                    echo "<div class='modal-content'>";
                    echo "<div class='modal-header'>";
                    echo "<button type='button' class='close' data-dismiss='modal' aria-hidden='true'>×</button>";
                    echo "<h4 class='modal-title'>Redeem Points</h4>";
                    echo "</div>";
                        echo "<form class='form-horizontal'  class='contact' name='redemmpointsForm' id='redemmpointsForm' >";
                        echo " <div class='form-group'>";
                        echo "<h3>You may only redeem the maxium points of : <?php echo $maxpoints;?></h3>";
                        echo "<input type='hidden' name='playerid' value='<?php echo $playerId;;?>' />";
                        echo "<input type='number'  valuemax='<?php echo $maxpoints;?>' name='points' id='points' class='form-control' placeholder='How many points do you wish to redeem.' />";
                        echo "<label class='control-label col-md-4' for='Comments'>Comments?</label>";
                        echo "<input type='text' name='comments' />";

                        echo "     </div>";
                        echo "    <div class='form-group'>";
                        echo "            <div class='col-md-6'>";
                        echo "                <input type='button' class='btn btn-success' name='submit' id='submit' Text='Submit'>";
                        echo "     <a href='#' class='btn' data-dismiss='modal'>Close</a>";
                        echo "         </div>";
                        echo "      </div>";
                        echo "</form>";
                    echo "      </div>";
                            echo "      </div>";
                                echo "      </div>";
            }



        add_shortcode( 'go_greenredempoints', 'gs_redeemplugin' );

So my confusion is to what i need in this function to make player id availbe to inline form for the post. Or should i use update option and store it.

    function gs_redeemplugin($atts) {


        ob_start();

         extract( shortcode_atts( array(
            'playerId' => 'myvalue'

        ), $atts ) );




        show_form();
        return ob_get_clean();
    }

via Chebli Mohamed