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* @author Mudit Ameta
* @license https://github.com/zeusdeux/isInViewport/blob/master/license.md MIT
*/
(function($, window) {
// polyfilling trim for ie < 9. sigh ;-;
if (!String.prototype.hasOwnProperty('trim')) {
String.prototype.trim = function() {
return this.replace(/^\s*(.*?)\s*$/, '$1');
};
}
// lets you chain any arbitrary function or an array of functions and returns a jquery object
var run = function(args) {
if (arguments.length === 1 && typeof args === 'function')
args = [args];
if (!(args instanceof Array))
throw new SyntaxError('isInViewport: Argument(s) passed to .do/.run should be a function or an array of functions');
for (var i = 0; i < args.length; i++) {
if (typeof args[i] !== 'function') {
console.warn('isInViewport: Argument(s) passed to .do/.run should be a function or an array of functions');
console.warn('isInViewport: Ignoring non-function values in array and moving on');
continue;
}
for (var j = 0; j < this.length; j++)
args[i].call($(this[j]));
}
return this;
};
// do is a reserved word and hence using it as a property throws on some browsers
// it is now aliased as $.fn.run
// deprecate $.fn.do (2.3.0)
$.fn['do'] = function(args) {
console.warn('isInViewport: .do is deprecated as it causes issues in IE and some browsers since it\'s a reserved word. Use $.fn.run instead i.e., $(el).run(fn).');
return run(args);
};
$.fn.run = run;
// gets the width of the scrollbar
function getScrollbarWidth(viewport) {
var scrollBarWidth;
// 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
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 boundingRect = element.getBoundingClientRect();
var top = boundingRect.top;
var bottom = boundingRect.bottom;
var left = boundingRect.left;
var right = boundingRect.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
var getSelectorArgs = function(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 {};
};
// expose isInViewport as a custom pseudo-selector
$.extend($.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);
});
};
})(jQuery, window);