Current File : //proc/1857783/root/var/www/pn/wp-content/plugins/ajax-search-pro/js/nomin/jquery.inviewport.js
/**
* @author Mudit Ameta
* @license https://github.com/zeusdeux/isInViewport/blob/master/license.md MIT
*/
;(function (window) {
'use strict';
var $ = window.jQuery;
// expose isInViewport as a custom pseudo-selector
$.extend($.expr.pseudos || $.expr[':'], {
// if $.expr.createPseudo is available, use it
'in-viewport': $.expr.createPseudo
? $.expr.createPseudo(function (argsString) {
return function (currElement) {
return isInViewport(currElement, getSelectorArgs(argsString));
};
})
: function (currObj, index, meta) {
return isInViewport(currObj, getSelectorArgs(meta[3]));
}
});
// expose isInViewport as a function too
// this lets folks pass around actual objects as options (like custom viewport)
// and doesn't tie 'em down to strings. It also prevents isInViewport from
// having to look up and wrap the dom element corresponding to the viewport selector
$.fn.isInViewport = function (options) {
return this.filter(function (i, el) {
return isInViewport(el, options);
})
};
$.fn.run = run;
// lets you chain any arbitrary function or an array of functions and returns a jquery object
function run(args) {
var this$1 = this;
if (arguments.length === 1 && typeof args === 'function') {
args = [args];
}
if (!(args instanceof Array)) {
throw new SyntaxError('isInViewport: Argument(s) passed to .do/.run should be a function or an array of functions')
}
args.forEach(function (arg) {
if (typeof arg !== 'function') {
console.warn('isInViewport: Argument(s) passed to .do/.run should be a function or an array of functions');
console.warn('isInViewport: Ignoring non-function values in array and moving on');
} else {
[].slice.call(this$1).forEach(function (t) {
return arg.call($(t));
});
}
});
return this
}
// gets the width of the scrollbar
function getScrollbarWidth(viewport) {
// append a div that has 100% width to get true width of viewport
var el = $('<div></div>').css({
width: '100%'
});
viewport.append(el);
// subtract true width from the viewport width which is inclusive
// of scrollbar by default
var scrollBarWidth = viewport.width() - el.width();
// remove our element from DOM
el.remove();
return scrollBarWidth
}
// Returns true if DOM element `element` is in viewport
function isInViewport(element, options) {
var ref = element.getBoundingClientRect();
var top = ref.top;
var bottom = ref.bottom;
var left = ref.left;
var right = ref.right;
var settings = $.extend({
tolerance: 0,
viewport: window
}, options);
var isVisibleFlag = false;
var $viewport = settings.viewport.jquery ? settings.viewport : $(settings.viewport);
if (!$viewport.length) {
console.warn('isInViewport: The viewport selector you have provided matches no element on page.');
console.warn('isInViewport: Defaulting to viewport as window');
$viewport = $(window);
}
var $viewportHeight = $viewport.height();
var $viewportWidth = $viewport.width();
var typeofViewport = $viewport[0].toString();
// if the viewport is other than window recalculate the top,
// bottom,left and right wrt the new viewport
// the [object DOMWindow] check is for window object type in PhantomJS
if ($viewport[0] !== window && typeofViewport !== '[object Window]' && typeofViewport !== '[object DOMWindow]') {
// use getBoundingClientRect() instead of $.Offset()
// since the original top/bottom positions are calculated relative to browser viewport and not document
var viewportRect = $viewport[0].getBoundingClientRect();
// recalculate these relative to viewport
top = top - viewportRect.top;
bottom = bottom - viewportRect.top;
left = left - viewportRect.left;
right = right - viewportRect.left;
// get the scrollbar width from cache or calculate it
isInViewport.scrollBarWidth = isInViewport.scrollBarWidth || getScrollbarWidth($viewport);
// remove the width of the scrollbar from the viewport width
$viewportWidth -= isInViewport.scrollBarWidth;
}
// handle falsy, non-number and non-integer tolerance value
// same as checking using isNaN and then setting to 0
// bitwise operators deserve some love too you know
settings.tolerance = ~~Math.round(parseFloat(settings.tolerance));
if (settings.tolerance < 0) {
settings.tolerance = $viewportHeight + settings.tolerance; // viewport height - tol
}
// the element is NOT in viewport iff it is completely out of
// viewport laterally or if it is completely out of the tolerance
// region. Therefore, if it is partially in view then it is considered
// to be in the viewport and hence true is returned. Because we have adjusted
// the left/right positions relative to the viewport, we should check the
// element's right against the viewport's 0 (left side), and the element's
// left against the viewport's width to see if it is outside of the viewport.
if (right <= 0 || left >= $viewportWidth) {
return isVisibleFlag
}
// if the element is bound to some tolerance
isVisibleFlag = settings.tolerance ? top <= settings.tolerance && bottom >= settings.tolerance : bottom > 0 && top <= $viewportHeight;
return isVisibleFlag
}
// get the selector args from the args string proved by Sizzle
function getSelectorArgs(argsString) {
if (argsString) {
var args = argsString.split(',');
// when user only gives viewport and no tolerance
if (args.length === 1 && isNaN(args[0])) {
args[1] = args[0];
args[0] = void 0;
}
return {
tolerance: args[0] ? args[0].trim() : void 0,
viewport: args[1] ? $(args[1].trim()) : void 0
}
}
return {}
}
})(window);
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