https://myinnos.in/js/hoverIntent.js

1/*!
2 * hoverIntent v1.8.1 // 2014.08.11 // jQuery v1.9.1+
3 * http://briancherne.github.io/jquery-hoverIntent/
4 *
5 * You may use hoverIntent under the terms of the MIT license. Basically that
6 * means you are free to use hoverIntent as long as this header is left intact.
7 * Copyright 2007, 2014 Brian Cherne
8 */
9
10/* hoverIntent is similar to jQuery's built-in "hover" method except that
11 * instead of firing the handlerIn function immediately, hoverIntent checks
12 * to see if the user's mouse has slowed down (beneath the sensitivity
13 * threshold) before firing the event. The handlerOut function is only
14 * called after a matching handlerIn.
15 *
16 * // basic usage ... just like .hover()
17 * .hoverIntent( handlerIn, handlerOut )
18 * .hoverIntent( handlerInOut )
19 *
20 * // basic usage ... with event delegation!
21 * .hoverIntent( handlerIn, handlerOut, selector )
22 * .hoverIntent( handlerInOut, selector )
23 *
24 * // using a basic configuration object
25 * .hoverIntent( config )
26 *
27 * @param  handlerIn   function OR configuration object
28 * @param  handlerOut  function OR selector for delegation OR undefined
29 * @param  selector    selector OR undefined
30 * @author Brian Cherne <brian(at)cherne(dot)net>
31 */
32
33;(function(factory) {
34    'use strict';
35    if (typeof define === 'function' && define.amd) {
36        define(['jquery'], factory);
37    } else if (jQuery && !jQuery.fn.hoverIntent) {
38        factory(jQuery);
39    }
40})(function($) {
41    'use strict';
42
43    // default configuration values
44    var _cfg = {
45        interval: 100,
46        sensitivity: 6,
47        timeout: 0
48    };
49
50    // counter used to generate an ID for each instance
51    var INSTANCE_COUNT = 0;
52
53    // current X and Y position of mouse, updated during mousemove tracking (shared across instances)
54    var cX, cY;
55
56    // saves the current pointer position coordinates based on the given mousemove event
57    var track = function(ev) {
58        cX = ev.pageX;
59        cY = ev.pageY;
60    };
61
62    // compares current and previous mouse positions
63    var compare = function(ev,$el,s,cfg) {
64        // compare mouse positions to see if pointer has slowed enough to trigger `over` function
65        if ( Math.sqrt( (s.pX-cX)*(s.pX-cX) + (s.pY-cY)*(s.pY-cY) ) < cfg.sensitivity ) {
66            $el.off(s.event,track);
67            delete s.timeoutId;
68            // set hoverIntent state as active for this element (permits `out` handler to trigger)
69            s.isActive = true;
70            // overwrite old mouseenter event coordinates with most recent pointer position
71            ev.pageX = cX; ev.pageY = cY;
72            // clear coordinate data from state object
73            delete s.pX; delete s.pY;
74            return cfg.over.apply($el[0],[ev]);
75        } else {
76            // set previous coordinates for next comparison
77            s.pX = cX; s.pY = cY;
78            // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
79            s.timeoutId = setTimeout( function(){compare(ev, $el, s, cfg);} , cfg.interval );
80        }
81    };
82
83    // triggers given `out` function at configured `timeout` after a mouseleave and clears state
84    var delay = function(ev,$el,s,out) {
85        delete $el.data('hoverIntent')[s.id];
86        return out.apply($el[0],[ev]);
87    };
88
89    $.fn.hoverIntent = function(handlerIn,handlerOut,selector) {
90        // instance ID, used as a key to store and retrieve state information on an element
91        var instanceId = INSTANCE_COUNT++;
92
93        // extend the default configuration and parse parameters
94        var cfg = $.extend({}, _cfg);
95        if ( $.isPlainObject(handlerIn) ) {
96            cfg = $.extend(cfg, handlerIn);
97            if ( !$.isFunction(cfg.out) ) {
98                cfg.out = cfg.over;
99            }
100        } else if ( $.isFunction(handlerOut) ) {
101            cfg = $.extend(cfg, { over: handlerIn, out: handlerOut, selector: selector } );
102        } else {
103            cfg = $.extend(cfg, { over: handlerIn, out: handlerIn, selector: handlerOut } );
104        }
105
106        // A private function for handling mouse 'hovering'
107        var handleHover = function(e) {
108            // cloned event to pass to handlers (copy required for event object to be passed in IE)
109            var ev = $.extend({},e);
110
111            // the current target of the mouse event, wrapped in a jQuery object
112            var $el = $(this);
113
114            // read hoverIntent data from element (or initialize if not present)
115            var hoverIntentData = $el.data('hoverIntent');
116            if (!hoverIntentData) { $el.data('hoverIntent', (hoverIntentData = {})); }
117
118            // read per-instance state from element (or initialize if not present)
119            var state = hoverIntentData[instanceId];
120            if (!state) { hoverIntentData[instanceId] = state = { id: instanceId }; }
121
122            // state properties:
123            // id = instance ID, used to clean up data
124            // timeoutId = timeout ID, reused for tracking mouse position and delaying "out" handler
125            // isActive = plugin state, true after `over` is called just until `out` is called
126            // pX, pY = previously-measured pointer coordinates, updated at each polling interval
127            // event = string representing the namespaced event used for mouse tracking
128
129            // clear any existing timeout
130            if (state.timeoutId) { state.timeoutId = clearTimeout(state.timeoutId); }
131
132            // namespaced event used to register and unregister mousemove tracking
133            var mousemove = state.event = 'mousemove.hoverIntent.hoverIntent'+instanceId;
134
135            // handle the event, based on its type
136            if (e.type === 'mouseenter') {
137                // do nothing if already active
138                if (state.isActive) { return; }
139                // set "previous" X and Y position based on initial entry point
140                state.pX = ev.pageX; state.pY = ev.pageY;
141                // update "current" X and Y position based on mousemove
142                $el.off(mousemove,track).on(mousemove,track);
143                // start polling interval (self-calling timeout) to compare mouse coordinates over time
144                state.timeoutId = setTimeout( function(){compare(ev,$el,state,cfg);} , cfg.interval );
145            } else { // "mouseleave"
146                // do nothing if not already active
147                if (!state.isActive) { return; }
148                // unbind expensive mousemove event
149                $el.off(mousemove,track);
150                // if hoverIntent state is true, then call the mouseOut function after the specified delay
151                state.timeoutId = setTimeout( function(){delay(ev,$el,state,cfg.out);} , cfg.timeout );
152            }
153        };
154
155        // listen for mouseenter and mouseleave
156        return this.on({'mouseenter.hoverIntent':handleHover,'mouseleave.hoverIntent':handleHover}, cfg.selector);
157    };
158});