function switchTab()

in public/js/learn.js [50:84]
24 lines of code
5 McCabe index (conditional complexity)

function switchTab(tabGroup, tabId) {
    allTabItems = jQuery("[data-tab-group='"+tabGroup+"']");
    targetTabItems = jQuery("[data-tab-group='"+tabGroup+"'][data-tab-item='"+tabId+"']");

    // if event is undefined then switchTab was called from restoreTabSelection
    // so it's not a button event and we don't need to safe the selction or
    // prevent page jump
    var isButtonEvent = event != undefined;

    if(isButtonEvent){
      // save button position relative to viewport
      var yposButton = event.target.getBoundingClientRect().top;
    }

    allTabItems.removeClass("active");
    targetTabItems.addClass("active");

    if(isButtonEvent){
      // reset screen to the same position relative to clicked button to prevent page jump
      var yposButtonDiff = event.target.getBoundingClientRect().top - yposButton;
      window.scrollTo(window.scrollX, window.scrollY+yposButtonDiff);

      // Store the selection to make it persistent
      if(window.localStorage){
          var selectionsJSON = window.localStorage.getItem("tabSelections");
          if(selectionsJSON){
            var tabSelections = JSON.parse(selectionsJSON);
          }else{
            var tabSelections = {};
          }
          tabSelections[tabGroup] = tabId;
          window.localStorage.setItem("tabSelections", JSON.stringify(tabSelections));
      }
    }
}