You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
106 lines
4.1 KiB
JavaScript
106 lines
4.1 KiB
JavaScript
/**
|
|
* hoverIntent is similar to jQuery's built-in "hover" function except that
|
|
* instead of firing the onMouseOver event immediately, hoverIntent checks
|
|
* to see if the user's mouse has slowed down (beneath the sensitivity
|
|
* threshold) before firing the onMouseOver event.
|
|
*
|
|
* hoverIntent r6 // 2011.02.26 // jQuery 1.5.1+
|
|
* <http://cherne.net/brian/resources/jquery.hoverIntent.html>
|
|
*
|
|
* hoverIntent is currently available for use in all personal or commercial
|
|
* projects under both MIT and GPL licenses. This means that you can choose
|
|
* the license that best suits your project, and use it accordingly.
|
|
*
|
|
* // basic usage (just like .hover) receives onMouseOver and onMouseOut functions
|
|
* $("ul li").hoverIntent( showNav , hideNav );
|
|
*
|
|
* // advanced usage receives configuration object only
|
|
* $("ul li").hoverIntent({
|
|
* sensitivity: 7, // number = sensitivity threshold (must be 1 or higher)
|
|
* interval: 100, // number = milliseconds of polling interval
|
|
* over: showNav, // function = onMouseOver callback (required)
|
|
* timeout: 0, // number = milliseconds delay before onMouseOut function call
|
|
* out: hideNav // function = onMouseOut callback (required)
|
|
* });
|
|
*
|
|
* @param f onMouseOver function || An object with configuration options
|
|
* @param g onMouseOut function || Nothing (use configuration options object)
|
|
* @author Brian Cherne brian(at)cherne(dot)net
|
|
*/
|
|
(function($) {
|
|
$.fn.hoverIntent = function(f,g) {
|
|
// default configuration options
|
|
var cfg = {
|
|
sensitivity: 7,
|
|
interval: 100,
|
|
timeout: 0
|
|
};
|
|
// override configuration options with user supplied object
|
|
cfg = $.extend(cfg, g ? { over: f, out: g } : f );
|
|
|
|
// instantiate variables
|
|
// cX, cY = current X and Y position of mouse, updated by mousemove event
|
|
// pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
|
|
var cX, cY, pX, pY;
|
|
|
|
// A private function for getting mouse position
|
|
var track = function(ev) {
|
|
cX = ev.pageX;
|
|
cY = ev.pageY;
|
|
};
|
|
|
|
// A private function for comparing current and previous mouse position
|
|
var compare = function(ev,ob) {
|
|
ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
|
|
// compare mouse positions to see if they've crossed the threshold
|
|
if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
|
|
$(ob).unbind("mousemove",track);
|
|
// set hoverIntent state to true (so mouseOut can be called)
|
|
ob.hoverIntent_s = 1;
|
|
return cfg.over.apply(ob,[ev]);
|
|
} else {
|
|
// set previous coordinates for next time
|
|
pX = cX; pY = cY;
|
|
// use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
|
|
ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
|
|
}
|
|
};
|
|
|
|
// A private function for delaying the mouseOut function
|
|
var delay = function(ev,ob) {
|
|
ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
|
|
ob.hoverIntent_s = 0;
|
|
return cfg.out.apply(ob,[ev]);
|
|
};
|
|
|
|
// A private function for handling mouse 'hovering'
|
|
var handleHover = function(e) {
|
|
// copy objects to be passed into t (required for event object to be passed in IE)
|
|
var ev = jQuery.extend({},e);
|
|
var ob = this;
|
|
|
|
// cancel hoverIntent timer if it exists
|
|
if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
|
|
|
|
// if e.type == "mouseenter"
|
|
if (e.type == "mouseenter") {
|
|
// set "previous" X and Y position based on initial entry point
|
|
pX = ev.pageX; pY = ev.pageY;
|
|
// update "current" X and Y position based on mousemove
|
|
$(ob).bind("mousemove",track);
|
|
// start polling interval (self-calling timeout) to compare mouse coordinates over time
|
|
if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}
|
|
|
|
// else e.type == "mouseleave"
|
|
} else {
|
|
// unbind expensive mousemove event
|
|
$(ob).unbind("mousemove",track);
|
|
// if hoverIntent state is true, then call the mouseOut function after the specified delay
|
|
if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
|
|
}
|
|
};
|
|
|
|
// bind the function to the two event listeners
|
|
return this.bind('mouseenter',handleHover).bind('mouseleave',handleHover);
|
|
};
|
|
})(jQuery); |