foreground/assets/scripts/foundation/foundation.slider.js

;(function ($, window, document, undefined) {
  'use strict';

  Foundation.libs.slider = {
    name : 'slider',

    version : '5.5.3',

    settings : {
      start : 0,
      end : 100,
      step : 1,
      precision : 2,
      initial : null,
      display_selector : '',
      vertical : false,
      trigger_input_change : false,
      on_change : function () {}
    },

    cache : {},

    init : function (scope, method, options) {
      Foundation.inherit(this, 'throttle');
      this.bindings(method, options);
      this.reflow();
    },

    events : function () {
      var self = this;
      $(this.scope)
        .off('.slider')
        .on('mousedown.fndtn.slider touchstart.fndtn.slider pointerdown.fndtn.slider',
        '[' + self.attr_name() + ']:not(.disabled, [disabled]) .range-slider-handle', function (e) {
          if (!self.cache.active) {
            e.preventDefault();
            self.set_active_slider($(e.target));
          }
        })
        .on('mousemove.fndtn.slider touchmove.fndtn.slider pointermove.fndtn.slider', function (e) {
          if (!!self.cache.active) {
            e.preventDefault();
            if ($.data(self.cache.active[0], 'settings').vertical) {
              var scroll_offset = 0;
              if (!e.pageY) {
                scroll_offset = window.scrollY;
              }
              self.calculate_position(self.cache.active, self.get_cursor_position(e, 'y') + scroll_offset);
            } else {
              self.calculate_position(self.cache.active, self.get_cursor_position(e, 'x'));
            }
          }
        })
        .on('mouseup.fndtn.slider touchend.fndtn.slider pointerup.fndtn.slider', function (e) {
          if(!self.cache.active) {
            // if the user has just clicked into the slider without starting to drag the handle
            var slider = $(e.target).attr('role') === 'slider' ? $(e.target) : $(e.target).closest('.range-slider').find("[role='slider']");

            if (slider.length && (!slider.parent().hasClass('disabled') && !slider.parent().attr('disabled'))) {
              self.set_active_slider(slider);
              if ($.data(self.cache.active[0], 'settings').vertical) {
                var scroll_offset = 0;
                if (!e.pageY) {
                  scroll_offset = window.scrollY;
                }
                self.calculate_position(self.cache.active, self.get_cursor_position(e, 'y') + scroll_offset);
              } else {
                self.calculate_position(self.cache.active, self.get_cursor_position(e, 'x'));
              }
            }
          }
          self.remove_active_slider();
        })
        .on('change.fndtn.slider', function (e) {
          self.settings.on_change();
        });

      self.S(window)
        .on('resize.fndtn.slider', self.throttle(function (e) {
          self.reflow();
        }, 300));

      // update slider value as users change input value
      this.S('[' + this.attr_name() + ']').each(function () {
        var slider = $(this),
            handle = slider.children('.range-slider-handle')[0],
            settings = self.initialize_settings(handle);

        if (settings.display_selector != '') {
          $(settings.display_selector).each(function(){
            if ($(this).attr('value')) {
              $(this).off('change').on('change', function () {
                slider.foundation("slider", "set_value", $(this).val());
              });
            }
          });
        }
      });
    },

    get_cursor_position : function (e, xy) {
      var pageXY = 'page' + xy.toUpperCase(),
          clientXY = 'client' + xy.toUpperCase(),
          position;

      if (typeof e[pageXY] !== 'undefined') {
        position = e[pageXY];
      } else if (typeof e.originalEvent[clientXY] !== 'undefined') {
        position = e.originalEvent[clientXY];
      } else if (e.originalEvent.touches && e.originalEvent.touches[0] && typeof e.originalEvent.touches[0][clientXY] !== 'undefined') {
        position = e.originalEvent.touches[0][clientXY];
      } else if (e.currentPoint && typeof e.currentPoint[xy] !== 'undefined') {
        position = e.currentPoint[xy];
      }

      return position;
    },

    set_active_slider : function ($handle) {
      this.cache.active = $handle;
    },

    remove_active_slider : function () {
      this.cache.active = null;
    },

    calculate_position : function ($handle, cursor_x) {
      var self = this,
          settings = $.data($handle[0], 'settings'),
          handle_l = $.data($handle[0], 'handle_l'),
          handle_o = $.data($handle[0], 'handle_o'),
          bar_l = $.data($handle[0], 'bar_l'),
          bar_o = $.data($handle[0], 'bar_o');

      requestAnimationFrame(function () {
        var pct;

        if (Foundation.rtl && !settings.vertical) {
          pct = self.limit_to(((bar_o + bar_l - cursor_x) / bar_l), 0, 1);
        } else {
          pct = self.limit_to(((cursor_x - bar_o) / bar_l), 0, 1);
        }

        pct = settings.vertical ? 1 - pct : pct;

        var norm = self.normalized_value(pct, settings.start, settings.end, settings.step, settings.precision);

        self.set_ui($handle, norm);
      });
    },

    set_ui : function ($handle, value) {
      var settings = $.data($handle[0], 'settings'),
          handle_l = $.data($handle[0], 'handle_l'),
          bar_l = $.data($handle[0], 'bar_l'),
          norm_pct = this.normalized_percentage(value, settings.start, settings.end),
          handle_offset = norm_pct * (bar_l - handle_l) - 1,
          progress_bar_length = norm_pct * 100,
          $handle_parent = $handle.parent(),
          $hidden_inputs = $handle.parent().children('input[type=hidden]');

      if (Foundation.rtl && !settings.vertical) {
        handle_offset = -handle_offset;
      }

      handle_offset = settings.vertical ? -handle_offset + bar_l - handle_l + 1 : handle_offset;
      this.set_translate($handle, handle_offset, settings.vertical);

      if (settings.vertical) {
        $handle.siblings('.range-slider-active-segment').css('height', progress_bar_length + '%');
      } else {
        $handle.siblings('.range-slider-active-segment').css('width', progress_bar_length + '%');
      }

      $handle_parent.attr(this.attr_name(), value).trigger('change.fndtn.slider');

      $hidden_inputs.val(value);
      if (settings.trigger_input_change) {
          $hidden_inputs.trigger('change.fndtn.slider');
      }

      if (!$handle[0].hasAttribute('aria-valuemin')) {
        $handle.attr({
          'aria-valuemin' : settings.start,
          'aria-valuemax' : settings.end
        });
      }
      $handle.attr('aria-valuenow', value);

      if (settings.display_selector != '') {
        $(settings.display_selector).each(function () {
          if (this.hasAttribute('value')) {
            $(this).val(value);
          } else {
            $(this).text(value);
          }
        });
      }

    },

    normalized_percentage : function (val, start, end) {
      return Math.min(1, (val - start) / (end - start));
    },

    normalized_value : function (val, start, end, step, precision) {
      var range = end - start,
          point = val * range,
          mod = (point - (point % step)) / step,
          rem = point % step,
          round = ( rem >= step * 0.5 ? step : 0);
      return ((mod * step + round) + start).toFixed(precision);
    },

    set_translate : function (ele, offset, vertical) {
      if (vertical) {
        $(ele)
          .css('-webkit-transform', 'translateY(' + offset + 'px)')
          .css('-moz-transform', 'translateY(' + offset + 'px)')
          .css('-ms-transform', 'translateY(' + offset + 'px)')
          .css('-o-transform', 'translateY(' + offset + 'px)')
          .css('transform', 'translateY(' + offset + 'px)');
      } else {
        $(ele)
          .css('-webkit-transform', 'translateX(' + offset + 'px)')
          .css('-moz-transform', 'translateX(' + offset + 'px)')
          .css('-ms-transform', 'translateX(' + offset + 'px)')
          .css('-o-transform', 'translateX(' + offset + 'px)')
          .css('transform', 'translateX(' + offset + 'px)');
      }
    },

    limit_to : function (val, min, max) {
      return Math.min(Math.max(val, min), max);
    },

    initialize_settings : function (handle) {
      var settings = $.extend({}, this.settings, this.data_options($(handle).parent())),
          decimal_places_match_result;

      if (settings.precision === null) {
        decimal_places_match_result = ('' + settings.step).match(/\.([\d]*)/);
        settings.precision = decimal_places_match_result && decimal_places_match_result[1] ? decimal_places_match_result[1].length : 0;
      }

      if (settings.vertical) {
        $.data(handle, 'bar_o', $(handle).parent().offset().top);
        $.data(handle, 'bar_l', $(handle).parent().outerHeight());
        $.data(handle, 'handle_o', $(handle).offset().top);
        $.data(handle, 'handle_l', $(handle).outerHeight());
      } else {
        $.data(handle, 'bar_o', $(handle).parent().offset().left);
        $.data(handle, 'bar_l', $(handle).parent().outerWidth());
        $.data(handle, 'handle_o', $(handle).offset().left);
        $.data(handle, 'handle_l', $(handle).outerWidth());
      }

      $.data(handle, 'bar', $(handle).parent());
      return $.data(handle, 'settings', settings);
    },

    set_initial_position : function ($ele) {
      var settings = $.data($ele.children('.range-slider-handle')[0], 'settings'),
          initial = ((typeof settings.initial == 'number' && !isNaN(settings.initial)) ? settings.initial : Math.floor((settings.end - settings.start) * 0.5 / settings.step) * settings.step + settings.start),
          $handle = $ele.children('.range-slider-handle');
      this.set_ui($handle, initial);
    },

    set_value : function (value) {
      var self = this;
      $('[' + self.attr_name() + ']', this.scope).each(function () {
        $(this).attr(self.attr_name(), value);
      });
      if (!!$(this.scope).attr(self.attr_name())) {
        $(this.scope).attr(self.attr_name(), value);
      }
      self.reflow();
    },

    reflow : function () {
      var self = this;
      self.S('[' + this.attr_name() + ']').each(function () {
        var handle = $(this).children('.range-slider-handle')[0],
            val = $(this).attr(self.attr_name());
        self.initialize_settings(handle);

        if (val) {
          self.set_ui($(handle), parseFloat(val));
        } else {
          self.set_initial_position($(this));
        }
      });
    }
  };

}(jQuery, window, window.document));