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Bootstrap/docs/dist/js/umd/scrollspy.js

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(function (global, factory) {
if (typeof define === 'function' && define.amd) {
define(['exports', 'module', './util'], factory);
} else if (typeof exports !== 'undefined' && typeof module !== 'undefined') {
factory(exports, module, require('./util'));
} else {
var mod = {
exports: {}
};
factory(mod.exports, mod, global.Util);
global.scrollspy = mod.exports;
}
})(this, function (exports, module, _util) {
'use strict';
var _createClass = (function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ('value' in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; })();
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError('Cannot call a class as a function'); } }
var _Util = _interopRequireDefault(_util);
/**
* --------------------------------------------------------------------------
* Bootstrap (v4.0.0): scrollspy.js
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* --------------------------------------------------------------------------
*/
var ScrollSpy = (function ($) {
/**
* ------------------------------------------------------------------------
* Constants
* ------------------------------------------------------------------------
*/
var NAME = 'scrollspy';
var VERSION = '4.0.0';
var DATA_KEY = 'bs.scrollspy';
var EVENT_KEY = '.' + DATA_KEY;
var DATA_API_KEY = '.data-api';
var JQUERY_NO_CONFLICT = $.fn[NAME];
var Default = {
offset: 10,
method: 'auto',
target: ''
};
var DefaultType = {
offset: 'number',
method: 'string',
target: '(string|element)'
};
var Event = {
ACTIVATE: 'activate' + EVENT_KEY,
SCROLL: 'scroll' + EVENT_KEY,
LOAD_DATA_API: 'load' + EVENT_KEY + '' + DATA_API_KEY
};
var ClassName = {
DROPDOWN_MENU: 'dropdown-menu',
ACTIVE: 'active'
};
var Selector = {
DATA_SPY: '[data-spy="scroll"]',
ACTIVE: '.active',
LI: 'li',
LI_DROPDOWN: 'li.dropdown',
NAV_ANCHORS: '.nav li > a'
};
var OffsetMethod = {
OFFSET: 'offset',
POSITION: 'position'
};
/**
* ------------------------------------------------------------------------
* Class Definition
* ------------------------------------------------------------------------
*/
var ScrollSpy = (function () {
function ScrollSpy(element, config) {
_classCallCheck(this, ScrollSpy);
this._element = element;
this._scrollElement = element.tagName === 'BODY' ? window : element;
this._config = this._getConfig(config);
this._selector = '' + this._config.target + ' ' + Selector.NAV_ANCHORS;
this._offsets = [];
this._targets = [];
this._activeTarget = null;
this._scrollHeight = 0;
$(this._scrollElement).on(Event.SCROLL, $.proxy(this._process, this));
this.refresh();
this._process();
}
_createClass(ScrollSpy, [{
key: 'refresh',
// public
value: function refresh() {
var _this = this;
var autoMethod = this._scrollElement !== this._scrollElement.window ? OffsetMethod.POSITION : OffsetMethod.OFFSET;
var offsetMethod = this._config.method === 'auto' ? autoMethod : this._config.method;
var offsetBase = offsetMethod === OffsetMethod.POSITION ? this._getScrollTop() : 0;
this._offsets = [];
this._targets = [];
this._scrollHeight = this._getScrollHeight();
var targets = $.makeArray($(this._selector));
targets.map(function (element) {
var target = undefined;
var targetSelector = _Util['default'].getSelectorFromElement(element);
if (targetSelector) {
target = $(targetSelector)[0];
}
if (target && (target.offsetWidth || target.offsetHeight)) {
// todo (fat): remove sketch reliance on jQuery position/offset
return [$(target)[offsetMethod]().top + offsetBase, targetSelector];
}
}).filter(function (item) {
return item;
}).sort(function (a, b) {
return a[0] - b[0];
}).forEach(function (item) {
_this._offsets.push(item[0]);
_this._targets.push(item[1]);
});
}
}, {
key: 'dispose',
value: function dispose() {
$.removeData(this._element, DATA_KEY);
$(this._scrollElement).off(EVENT_KEY);
this._element = null;
this._scrollElement = null;
this._config = null;
this._selector = null;
this._offsets = null;
this._targets = null;
this._activeTarget = null;
this._scrollHeight = null;
}
}, {
key: '_getConfig',
// private
value: function _getConfig(config) {
config = $.extend({}, Default, config);
if (typeof config.target !== 'string') {
var id = $(config.target).attr('id');
if (!id) {
id = _Util['default'].getUID(NAME);
$(config.target).attr('id', id);
}
config.target = '#' + id;
}
_Util['default'].typeCheckConfig(NAME, config, DefaultType);
return config;
}
}, {
key: '_getScrollTop',
value: function _getScrollTop() {
return this._scrollElement === window ? this._scrollElement.scrollY : this._scrollElement.scrollTop;
}
}, {
key: '_getScrollHeight',
value: function _getScrollHeight() {
return this._scrollElement.scrollHeight || Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
}
}, {
key: '_process',
value: function _process() {
var scrollTop = this._getScrollTop() + this._config.offset;
var scrollHeight = this._getScrollHeight();
var maxScroll = this._config.offset + scrollHeight - this._scrollElement.offsetHeight;
if (this._scrollHeight !== scrollHeight) {
this.refresh();
}
if (scrollTop >= maxScroll) {
var target = this._targets[this._targets.length - 1];
if (this._activeTarget !== target) {
this._activate(target);
}
}
if (this._activeTarget && scrollTop < this._offsets[0]) {
this._activeTarget = null;
this._clear();
return;
}
for (var i = this._offsets.length; i--;) {
var isActiveTarget = this._activeTarget !== this._targets[i] && scrollTop >= this._offsets[i] && (this._offsets[i + 1] === undefined || scrollTop < this._offsets[i + 1]);
if (isActiveTarget) {
this._activate(this._targets[i]);
}
}
}
}, {
key: '_activate',
value: function _activate(target) {
this._activeTarget = target;
this._clear();
var selector = '' + this._selector + '[data-target="' + target + '"],' + ('' + this._selector + '[href="' + target + '"]');
// todo (fat): getting all the raw li's up the tree is not great.
var parentListItems = $(selector).parents(Selector.LI);
for (var i = parentListItems.length; i--;) {
$(parentListItems[i]).addClass(ClassName.ACTIVE);
var itemParent = parentListItems[i].parentNode;
if (itemParent && $(itemParent).hasClass(ClassName.DROPDOWN_MENU)) {
var closestDropdown = $(itemParent).closest(Selector.LI_DROPDOWN)[0];
$(closestDropdown).addClass(ClassName.ACTIVE);
}
}
$(this._scrollElement).trigger(Event.ACTIVATE, {
relatedTarget: target
});
}
}, {
key: '_clear',
value: function _clear() {
var activeParents = $(this._selector).parentsUntil(this._config.target, Selector.ACTIVE);
for (var i = activeParents.length; i--;) {
$(activeParents[i]).removeClass(ClassName.ACTIVE);
}
}
}], [{
key: '_jQueryInterface',
// static
value: function _jQueryInterface(config) {
return this.each(function () {
var data = $(this).data(DATA_KEY);
var _config = typeof config === 'object' && config || null;
if (!data) {
data = new ScrollSpy(this, _config);
$(this).data(DATA_KEY, data);
}
if (typeof config === 'string') {
data[config]();
}
});
}
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}, {
key: 'VERSION',
// getters
get: function () {
return VERSION;
}
}, {
key: 'Default',
get: function () {
return Default;
}
}]);
return ScrollSpy;
})();
/**
* ------------------------------------------------------------------------
* Data Api implementation
* ------------------------------------------------------------------------
*/
$(window).on(Event.LOAD_DATA_API, function () {
var scrollSpys = $.makeArray($(Selector.DATA_SPY));
for (var i = scrollSpys.length; i--;) {
var $spy = $(scrollSpys[i]);
ScrollSpy._jQueryInterface.call($spy, $spy.data());
}
});
/**
* ------------------------------------------------------------------------
* jQuery
* ------------------------------------------------------------------------
*/
$.fn[NAME] = ScrollSpy._jQueryInterface;
$.fn[NAME].Constructor = ScrollSpy;
$.fn[NAME].noConflict = function () {
$.fn[NAME] = JQUERY_NO_CONFLICT;
return ScrollSpy._jQueryInterface;
};
return ScrollSpy;
})(jQuery);
module.exports = ScrollSpy;
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});