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From 2013.igem.org

(function($){ /* hoverIntent by Brian Cherne */ $.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) { // next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget; while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } } if ( p == this ) { return false; }

// 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); }

// else e.type == "onmouseover" if (e.type == "mouseover") { // 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 == "onmouseout" } 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.mouseover(handleHover).mouseout(handleHover); };

})(jQuery);