You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
126 lines
5.2 KiB
126 lines
5.2 KiB
/*
|
|
Version 1.7.4
|
|
The MIT License (MIT)
|
|
|
|
Copyright (c) 2014 Dirk Groenen
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
|
|
the Software, and to permit persons to whom the Software is furnished to do so,
|
|
subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
*/
|
|
|
|
(function($){
|
|
$.fn.viewportChecker = function(useroptions){
|
|
// Define options and extend with user
|
|
var options = {
|
|
classToAdd: 'visible',
|
|
classToRemove : 'invisible',
|
|
offset: 100,
|
|
repeat: false,
|
|
invertBottomOffset: true,
|
|
callbackFunction: function(elem, action){},
|
|
scrollHorizontal: false
|
|
};
|
|
$.extend(options, useroptions);
|
|
|
|
// Cache the given element and height of the browser
|
|
var $elem = this,
|
|
windowSize = {height: $(window).height(), width: $(window).width()},
|
|
scrollElem = ((navigator.userAgent.toLowerCase().indexOf('webkit') != -1) ? 'body' : 'html');
|
|
|
|
/*
|
|
* Main method that checks the elements and adds or removes the class(es)
|
|
*/
|
|
this.checkElements = function(){
|
|
var viewportStart, viewportEnd;
|
|
|
|
// Set some vars to check with
|
|
if(!options.scrollHorizontal){
|
|
viewportStart = $(scrollElem).scrollTop();
|
|
viewportEnd = (viewportStart + windowSize.height);
|
|
}
|
|
else{
|
|
viewportStart = $(scrollElem).scrollLeft();
|
|
viewportEnd = (viewportStart + windowSize.width);
|
|
}
|
|
|
|
// Loop through all given dom elements
|
|
$elem.each(function(){
|
|
var $obj = $(this),
|
|
objOptions = {},
|
|
attrOptions = {};
|
|
|
|
// Get any individual attribution data
|
|
if ($obj.data('vp-add-class'))
|
|
attrOptions.classToAdd = $obj.data('vp-add-class');
|
|
if ($obj.data('vp-remove-class'))
|
|
attrOptions.classToRemove = $obj.data('vp-remove-class');
|
|
if ($obj.data('vp-offset'))
|
|
attrOptions.offset = $obj.data('vp-offset');
|
|
if ($obj.data('vp-repeat'))
|
|
attrOptions.repeat = $obj.data('vp-repeat');
|
|
if ($obj.data('vp-scrollHorizontal'))
|
|
attrOptions.scrollHorizontal = $obj.data('vp-scrollHorizontal');
|
|
if ($obj.data('vp-invertBottomOffset'))
|
|
attrOptions.scrollHorizontal = $obj.data('vp-invertBottomOffset');
|
|
|
|
// Extend objOptions with data attributes and default options
|
|
$.extend(objOptions, options);
|
|
$.extend(objOptions, attrOptions);
|
|
|
|
// If class already exists; quit
|
|
if ($obj.hasClass(objOptions.classToAdd) && !objOptions.repeat){
|
|
return;
|
|
}
|
|
|
|
// define the top position of the element and include the offset which makes is appear earlier or later
|
|
var elemStart = (!objOptions.scrollHorizontal) ? Math.round( $obj.offset().top ) + objOptions.offset : Math.round( $obj.offset().left ) + objOptions.offset,
|
|
elemEnd = (!objOptions.scrollHorizontal) ? elemStart + $obj.height() : elemStart + $obj.width();
|
|
|
|
if(objOptions.invertBottomOffset)
|
|
elemEnd -= (objOptions.offset * 2);
|
|
|
|
// Add class if in viewport
|
|
if ((elemStart < viewportEnd) && (elemEnd > viewportStart)){
|
|
|
|
// remove class
|
|
$obj.removeClass(objOptions.classToRemove);
|
|
|
|
$obj.addClass(objOptions.classToAdd);
|
|
|
|
// Do the callback function. Callback wil send the jQuery object as parameter
|
|
objOptions.callbackFunction($obj, "add");
|
|
|
|
// Remove class if not in viewport and repeat is true
|
|
} else if ($obj.hasClass(objOptions.classToAdd) && (objOptions.repeat)){
|
|
$obj.removeClass(objOptions.classToAdd);
|
|
|
|
// Do the callback function.
|
|
objOptions.callbackFunction($obj, "remove");
|
|
}
|
|
});
|
|
|
|
};
|
|
|
|
// Run checkelements on load and scroll
|
|
$(window).bind("load scroll touchmove MSPointerMove", this.checkElements);
|
|
|
|
// On resize change the height var
|
|
$(window).resize(function(e){
|
|
windowSize = {height: $(window).height(), width: $(window).width()},
|
|
$elem.checkElements();
|
|
});
|
|
|
|
// trigger inital check if elements already visible
|
|
this.checkElements();
|
|
|
|
// Default jquery plugin behaviour
|
|
return this;
|
|
};
|
|
})(jQuery);
|