nag.js

/*
 * # Semantic - Nag
 * http://github.com/semantic-org/semantic-ui/
 *
 *
 * Copyright 2014 Contributor
 * Released under the MIT license
 * http://opensource.org/licenses/MIT
 *
 */

;(function ($, window, document, undefined) {

$.fn.nag = function(parameters) {
  var
    $allModules     = $(this),
    moduleSelector  = $allModules.selector || '',

    time            = new Date().getTime(),
    performance     = [],

    query           = arguments[0],
    methodInvoked   = (typeof query == 'string'),
    queryArguments  = [].slice.call(arguments, 1),
    returnedValue
  ;
  $(this)
    .each(function() {
      var
        settings        = $.extend(true, {}, $.fn.nag.settings, parameters),

        className       = settings.className,
        selector        = settings.selector,
        error           = settings.error,
        namespace       = settings.namespace,

        eventNamespace  = '.' + namespace,
        moduleNamespace = namespace + '-module',

        $module         = $(this),

        $close          = $module.find(selector.close),
        $context        = $(settings.context),


        element         = this,
        instance        = $module.data(moduleNamespace),

        moduleOffset,
        moduleHeight,

        contextWidth,
        contextHeight,
        contextOffset,

        yOffset,
        yPosition,

        timer,
        module,

        requestAnimationFrame = window.requestAnimationFrame
          || window.mozRequestAnimationFrame
          || window.webkitRequestAnimationFrame
          || window.msRequestAnimationFrame
          || function(callback) { setTimeout(callback, 0); }
      ;
      module = {

        initialize: function() {
          module.verbose('Initializing element');
          // calculate module offset once
          moduleOffset  = $module.offset();
          moduleHeight  = $module.outerHeight();
          contextWidth  = $context.outerWidth();
          contextHeight = $context.outerHeight();
          contextOffset = $context.offset();

          $module
            .data(moduleNamespace, module)
          ;
          $close
            .on('click' + eventNamespace, module.dismiss)
          ;
          // lets avoid javascript if we dont need to reposition
          if(settings.context == window && settings.position == 'fixed') {
            $module
              .addClass(className.fixed)
            ;
          }
          if(settings.sticky) {
            module.verbose('Adding scroll events');
            // retrigger on scroll for absolute
            if(settings.position == 'absolute') {
              $context
                .on('scroll' + eventNamespace, module.event.scroll)
                .on('resize' + eventNamespace, module.event.scroll)
              ;
            }
            // fixed is always relative to window
            else {
              $(window)
                .on('scroll' + eventNamespace, module.event.scroll)
                .on('resize' + eventNamespace, module.event.scroll)
              ;
            }
            // fire once to position on init
            $.proxy(module.event.scroll, this)();
          }

          if(settings.displayTime > 0) {
            setTimeout(module.hide, settings.displayTime);
          }
          if(module.should.show()) {
            if( !$module.is(':visible') ) {
              module.show();
            }
          }
          else {
            module.hide();
          }
        },

        destroy: function() {
          module.verbose('Destroying instance');
          $module
            .removeData(moduleNamespace)
            .off(eventNamespace)
          ;
          if(settings.sticky) {
            $context
              .off(eventNamespace)
            ;
          }
        },

        refresh: function() {
          module.debug('Refreshing cached calculations');
          moduleOffset  = $module.offset();
          moduleHeight  = $module.outerHeight();
          contextWidth  = $context.outerWidth();
          contextHeight = $context.outerHeight();
          contextOffset = $context.offset();
        },

        show: function() {
          module.debug('Showing nag', settings.animation.show);
          if(settings.animation.show == 'fade') {
            $module
              .fadeIn(settings.duration, settings.easing)
            ;
          }
          else {
            $module
              .slideDown(settings.duration, settings.easing)
            ;
          }
        },

        hide: function() {
          module.debug('Showing nag', settings.animation.hide);
          if(settings.animation.show == 'fade') {
            $module
              .fadeIn(settings.duration, settings.easing)
            ;
          }
          else {
            $module
              .slideUp(settings.duration, settings.easing)
            ;
          }
        },

        onHide: function() {
          module.debug('Removing nag', settings.animation.hide);
          $module.remove();
          if (settings.onHide) {
            settings.onHide();
          }
        },

        stick: function() {
          module.refresh();

          if(settings.position == 'fixed') {
            var
              windowScroll = $(window).prop('pageYOffset') || $(window).scrollTop(),
              fixedOffset = ( $module.hasClass(className.bottom) )
                ? contextOffset.top + (contextHeight - moduleHeight) - windowScroll
                : contextOffset.top - windowScroll
            ;
            $module
              .css({
                position : 'fixed',
                top      : fixedOffset,
                left     : contextOffset.left,
                width    : contextWidth - settings.scrollBarWidth
              })
            ;
          }
          else {
            $module
              .css({
                top : yPosition
              })
            ;
          }
        },
        unStick: function() {
          $module
            .css({
              top : ''
            })
          ;
        },
        dismiss: function(event) {
          if(settings.storageMethod) {
            module.storage.set(settings.storedKey, settings.storedValue);
          }
          module.hide();
          event.stopImmediatePropagation();
          event.preventDefault();
        },

        should: {
          show: function() {
            if(settings.persist) {
              module.debug('Persistent nag is set, can show nag');
              return true;
            }
            if(module.storage.get(settings.storedKey) != settings.storedValue) {
              module.debug('Stored value is not set, can show nag', module.storage.get(settings.storedKey));
              return true;
            }
            module.debug('Stored value is set, cannot show nag', module.storage.get(settings.storedKey));
            return false;
          },
          stick: function() {
            yOffset   = $context.prop('pageYOffset') || $context.scrollTop();
            yPosition = ( $module.hasClass(className.bottom) )
              ? (contextHeight - $module.outerHeight() ) + yOffset
              : yOffset
            ;
            // absolute position calculated when y offset met
            if(yPosition > moduleOffset.top) {
              return true;
            }
            else if(settings.position == 'fixed') {
              return true;
            }
            return false;
          }
        },

        storage: {

          set: function(key, value) {
            module.debug('Setting stored value', key, value, settings.storageMethod);
            if(settings.storageMethod == 'local' && window.store !== undefined) {
              window.store.set(key, value);
            }
            // store by cookie
            else if($.cookie !== undefined) {
              $.cookie(key, value);
            }
            else {
              module.error(error.noStorage);
            }
          },
          get: function(key) {
            module.debug('Getting stored value', key, settings.storageMethod);
            if(settings.storageMethod == 'local' && window.store !== undefined) {
              return window.store.get(key);
            }
            // get by cookie
            else if($.cookie !== undefined) {
              return $.cookie(key);
            }
            else {
              module.error(error.noStorage);
            }
          }

        },

        event: {
          scroll: function() {
            if(timer !== undefined) {
              clearTimeout(timer);
            }
            timer = setTimeout(function() {
              if(module.should.stick() ) {
                requestAnimationFrame(module.stick);
              }
              else {
                module.unStick();
              }
            }, settings.lag);
          }
        },
        setting: function(name, value) {
          module.debug('Changing setting', name, value);
          if( $.isPlainObject(name) ) {
            $.extend(true, settings, name);
          }
          else if(value !== undefined) {
            settings[name] = value;
          }
          else {
            return settings[name];
          }
        },
        internal: function(name, value) {
          module.debug('Changing internal', name, value);
          if(value !== undefined) {
            if( $.isPlainObject(name) ) {
              $.extend(true, module, name);
            }
            else {
              module[name] = value;
            }
          }
          else {
            return module[name];
          }
        },
        debug: function() {
          if(settings.debug) {
            if(settings.performance) {
              module.performance.log(arguments);
            }
            else {
              module.debug = Function.prototype.bind.call(console.info, console, settings.name + ':');
              module.debug.apply(console, arguments);
            }
          }
        },
        verbose: function() {
          if(settings.verbose && settings.debug) {
            if(settings.performance) {
              module.performance.log(arguments);
            }
            else {
              module.verbose = Function.prototype.bind.call(console.info, console, settings.name + ':');
              module.verbose.apply(console, arguments);
            }
          }
        },
        error: function() {
          module.error = Function.prototype.bind.call(console.error, console, settings.name + ':');
          module.error.apply(console, arguments);
        },
        performance: {
          log: function(message) {
            var
              currentTime,
              executionTime,
              previousTime
            ;
            if(settings.performance) {
              currentTime   = new Date().getTime();
              previousTime  = time || currentTime;
              executionTime = currentTime - previousTime;
              time          = currentTime;
              performance.push({
                'Element'        : element,
                'Name'           : message[0],
                'Arguments'      : [].slice.call(message, 1) || '',
                'Execution Time' : executionTime
              });
            }
            clearTimeout(module.performance.timer);
            module.performance.timer = setTimeout(module.performance.display, 100);
          },
          display: function() {
            var
              title = settings.name + ':',
              totalTime = 0
            ;
            time = false;
            clearTimeout(module.performance.timer);
            $.each(performance, function(index, data) {
              totalTime += data['Execution Time'];
            });
            title += ' ' + totalTime + 'ms';
            if(moduleSelector) {
              title += ' \'' + moduleSelector + '\'';
            }
            if($allModules.size() > 1) {
              title += ' ' + '(' + $allModules.size() + ')';
            }
            if( (console.group !== undefined || console.table !== undefined) && performance.length > 0) {
              console.groupCollapsed(title);
              if(console.table) {
                console.table(performance);
              }
              else {
                $.each(performance, function(index, data) {
                  console.log(data['Name'] + ': ' + data['Execution Time']+'ms');
                });
              }
              console.groupEnd();
            }
            performance = [];
          }
        },
        invoke: function(query, passedArguments, context) {
          var
            object = instance,
            maxDepth,
            found,
            response
          ;
          passedArguments = passedArguments || queryArguments;
          context         = element         || context;
          if(typeof query == 'string' && object !== undefined) {
            query    = query.split(/[\. ]/);
            maxDepth = query.length - 1;
            $.each(query, function(depth, value) {
              var camelCaseValue = (depth != maxDepth)
                ? value + query[depth + 1].charAt(0).toUpperCase() + query[depth + 1].slice(1)
                : query
              ;
              if( $.isPlainObject( object[camelCaseValue] ) && (depth != maxDepth) ) {
                object = object[camelCaseValue];
              }
              else if( object[camelCaseValue] !== undefined ) {
                found = object[camelCaseValue];
                return false;
              }
              else if( $.isPlainObject( object[value] ) && (depth != maxDepth) ) {
                object = object[value];
              }
              else if( object[value] !== undefined ) {
                found = object[value];
                return false;
              }
              else {
                return false;
              }
            });
          }
          if ( $.isFunction( found ) ) {
            response = found.apply(context, passedArguments);
          }
          else if(found !== undefined) {
            response = found;
          }
          if($.isArray(returnedValue)) {
            returnedValue.push(response);
          }
          else if(returnedValue !== undefined) {
            returnedValue = [returnedValue, response];
          }
          else if(response !== undefined) {
            returnedValue = response;
          }
          return found;
        }
      };
      if(methodInvoked) {
        if(instance === undefined) {
          module.initialize();
        }
        module.invoke(query);
      }
      else {
        if(instance !== undefined) {
          module.destroy();
        }
        module.initialize();
      }

    })
  ;
  return (returnedValue !== undefined)
    ? returnedValue
    : this
  ;
};

$.fn.nag.settings = {

  name        : 'Nag',

  debug       : false,
  verbose     : true,
  performance : true,

  namespace   : 'Nag',

  // allows cookie to be overriden
  persist     : false,

  // set to zero to manually dismiss, otherwise hides on its own
  displayTime : 0,

  animation   : {
    show: 'slide',
    hide: 'slide'
  },

  // method of stickyness
  position       : 'fixed',
  scrollBarWidth : 18,

  // type of storage to use
  storageMethod  : 'cookie',

  // value to store in dismissed localstorage/cookie
  storedKey      : 'nag',
  storedValue    : 'dismiss',

  // need to calculate stickyness on scroll
  sticky         : false,

  // how often to check scroll event
  lag            : 0,

  // context for scroll event
  context        : window,

  error: {
    noStorage  : 'Neither $.cookie or store is defined. A storage solution is required for storing state',
    method    : 'The method you called is not defined.'
  },

  className     : {
    bottom      : 'bottom',
    fixed       : 'fixed'
  },

  selector      : {
    close: '.icon.close'
  },

  speed         : 500,
  easing        : 'easeOutQuad',

  onHide: function() {}

};

})( jQuery, window , document );