sclass HDivWithVerticalExpandButton {
  int initialHeight;
  S expandButtonText = "Read more";
  O contents;
  S btnID = aGlobalID();
  
  *(int *initialHeight, O *contents) {}
  
  S html() {
    ret div(contents, class := "expandable", 
      style := "padding: 20px 10px; max-height: " + initialHeight + "px; overflow: hidden;") + "\n"
      + hbutton(expandButtonText, onclick := [[
        $(this).prev('.expandable').css('max-height', 'none');
        $(this).hide();
      ]], style := "display: none", id := btnID) + "\n"
      + hjs([[
        var btn = $(]] + jsQuote("#" + btnID) + [[);
        function check() {
          $(btn).toggle($(btn).prev('.expandable').outerHeight() >= ]] + initialHeight + [[);
          setTimeout(this, 5000);
        }
        check(); setTimeout(check, 1000);
      ]]);
  }
  
  bool needsJQuery() { true; }
}