JavaScript Get Client ID value - CARD-CIRCLE.JS

[knutsford01]

I am using card-circle.js



My Layout is

<div class="card">
                    <div class="card__container card__container--closed">
                        '''''''''
                        <div class="card__content">
                            <i class="card__btn-close fa fa-times"></i>
                            <div class="card__caption">
                               ''''
                                                             
                            </div>
                            <div class="card__copy">
                               '''''''''                                                                                                        

                           <br>
                            <br>
                                <form method="post" action="/" name="BookForm" id="BookForm" style="margin: 0px; padding: opx;">
                                    <input type="hidden" name="ClientID" id="ClientID" value="<% Response.Write(trim(rstList("ClientID"))) %>">
                                    <input type="hidden" name="BookThisArtist" id="BookThisArtist" value="Yes">                            
                                    <button type="submit" class="btn btn-primary btn-sm">Book <% Response.Write(trim(rstList("ArtistBandName"))) %> Now</button>
                                </form>
                            <br>
                         
                           </h5>                              
                                </span>

                                 
                                </div>

Thisis part of card-circle.js

function Card(id, el) {

    this.id = id;

    this._el = el;

    // Get elements.
    this._container = $(this._el).find(SELECTORS.container)[0];
    this._clip = $(this._el).find(SELECTORS.clip)[0];
    this._content = $(this._el).find(SELECTORS.content)[0];
 
    this.isOpen = false;

    this._TL = null;
  };

  /**
   * Open card.
   * @param {Function} callback The callback [ICODE]onCardMove[/ICODE].
   */
  Card.prototype.openCard = function(callback) {

    this._TL = new TimelineLite;

    var slideContentDown = this._slideContentDown();
    var clipImageIn = this._clipImageIn();
    var floatContainer = this._floatContainer(callback);
    var clipImageOut = this._clipImageOut();
    var slideContentUp = this._slideContentUp();

    // Compose sequence and use duration to overlap tweens.
    this._TL.add(slideContentDown);
    this._TL.add(clipImageIn, 0);
    this._TL.add(floatContainer, '-=' + clipImageIn.duration() * 0.6);
    this._TL.add(clipImageOut, '-=' + floatContainer.duration() * 0.3);
    this._TL.add(slideContentUp, '-=' + clipImageOut.duration() * 0.6);

How in Card.prototype.openCard = function(callback) {} can I pick up the value of

<input type="hidden" name="ClientID" id="ClientID" value="<% Response.Write(trim(rstList("ClientID"))) %>">


please