a code that when added into a Script Editor Web Part, on a site that has ShortPoint installed, will be executed as soon as ShortPoint is ready on the page.

shortpoint-ready.html

<script type="text/javascript">
(function() {
  
  'use strict';

  /**
   * hook method to be executed as soon as shortpoint
   * is available in the page
   */
  function initHook() {

    // exit on edit mode
    if( window.shortPointInserter ) {
        return;
    } 

    // shortpoint is ready and rendered on the page
    // page not in edit mode, do whatever you like 
    // here ...
  };

  // shortpoint not yet available in the page
  // wait for shortpoint ready dom event
  if( !window.shortpoint && !window.shortpoint.util ) {
    document.addEventListener( 'shortpoint-init', initHook );
  } else {
    initHook();
  }

})();
</script>