[28644] | 1 | (function($){
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| 2 | /* hoverIntent by Brian Cherne */
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| 3 | $.fn.hoverIntent = function(f,g) {
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| 4 | // default configuration options
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| 5 | var cfg = {
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| 6 | sensitivity: 7,
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| 7 | interval: 100,
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| 8 | timeout: 0
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| 9 | };
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| 10 | // override configuration options with user supplied object
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| 11 | cfg = $.extend(cfg, g ? { over: f, out: g } : f );
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| 12 |
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| 13 | // instantiate variables
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| 14 | // cX, cY = current X and Y position of mouse, updated by mousemove event
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| 15 | // pX, pY = previous X and Y position of mouse, set by mouseover and polling interval
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| 16 | var cX, cY, pX, pY;
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| 17 |
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| 18 | // A private function for getting mouse position
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| 19 | var track = function(ev) {
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| 20 | cX = ev.pageX;
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| 21 | cY = ev.pageY;
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| 22 | };
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| 23 |
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| 24 | // A private function for comparing current and previous mouse position
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| 25 | var compare = function(ev,ob) {
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| 26 | ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
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| 27 | // compare mouse positions to see if they've crossed the threshold
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| 28 | if ( ( Math.abs(pX-cX) + Math.abs(pY-cY) ) < cfg.sensitivity ) {
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| 29 | $(ob).unbind("mousemove",track);
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| 30 | // set hoverIntent state to true (so mouseOut can be called)
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| 31 | ob.hoverIntent_s = 1;
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| 32 | return cfg.over.apply(ob,[ev]);
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| 33 | } else {
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| 34 | // set previous coordinates for next time
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| 35 | pX = cX; pY = cY;
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| 36 | // use self-calling timeout, guarantees intervals are spaced out properly (avoids JavaScript timer bugs)
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| 37 | ob.hoverIntent_t = setTimeout( function(){compare(ev, ob);} , cfg.interval );
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| 38 | }
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| 39 | };
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| 40 |
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| 41 | // A private function for delaying the mouseOut function
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| 42 | var delay = function(ev,ob) {
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| 43 | ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t);
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| 44 | ob.hoverIntent_s = 0;
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| 45 | return cfg.out.apply(ob,[ev]);
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| 46 | };
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| 47 |
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| 48 | // A private function for handling mouse 'hovering'
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| 49 | var handleHover = function(e) {
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| 50 | // next three lines copied from jQuery.hover, ignore children onMouseOver/onMouseOut
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| 51 | var p = (e.type == "mouseover" ? e.fromElement : e.toElement) || e.relatedTarget;
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| 52 | while ( p && p != this ) { try { p = p.parentNode; } catch(e) { p = this; } }
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| 53 | if ( p == this ) { return false; }
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| 54 |
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| 55 | // copy objects to be passed into t (required for event object to be passed in IE)
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| 56 | var ev = jQuery.extend({},e);
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| 57 | var ob = this;
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| 58 |
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| 59 | // cancel hoverIntent timer if it exists
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| 60 | if (ob.hoverIntent_t) { ob.hoverIntent_t = clearTimeout(ob.hoverIntent_t); }
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| 61 |
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| 62 | // else e.type == "onmouseover"
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| 63 | if (e.type == "mouseover") {
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| 64 | // set "previous" X and Y position based on initial entry point
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| 65 | pX = ev.pageX; pY = ev.pageY;
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| 66 | // update "current" X and Y position based on mousemove
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| 67 | $(ob).bind("mousemove",track);
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| 68 | // start polling interval (self-calling timeout) to compare mouse coordinates over time
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| 69 | if (ob.hoverIntent_s != 1) { ob.hoverIntent_t = setTimeout( function(){compare(ev,ob);} , cfg.interval );}
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| 70 |
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| 71 | // else e.type == "onmouseout"
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| 72 | } else {
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| 73 | // unbind expensive mousemove event
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| 74 | $(ob).unbind("mousemove",track);
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| 75 | // if hoverIntent state is true, then call the mouseOut function after the specified delay
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| 76 | if (ob.hoverIntent_s == 1) { ob.hoverIntent_t = setTimeout( function(){delay(ev,ob);} , cfg.timeout );}
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| 77 | }
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| 78 | };
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| 79 |
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| 80 | // bind the function to the two event listeners
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| 81 | return this.mouseover(handleHover).mouseout(handleHover);
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| 82 | };
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| 83 |
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| 84 | })(jQuery); |
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