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affix.js
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/**
* angular-strap
* @version v2.3.8 - 2016-03-31
* @link http://mgcrea.github.io/angular-strap
* @author Olivier Louvignes <olivier@mg-crea.com> (https://github.com/mgcrea)
* @license MIT License, http://www.opensource.org/licenses/MIT
*/
'use strict';
angular.module('mgcrea.ngStrap.affix', [ 'mgcrea.ngStrap.helpers.dimensions', 'mgcrea.ngStrap.helpers.debounce' ]).provider('$affix', function() {
var defaults = this.defaults = {
offsetTop: 'auto',
inlineStyles: true
};
this.$get = [ '$window', 'debounce', 'dimensions', function($window, debounce, dimensions) {
var bodyEl = angular.element($window.document.body);
var windowEl = angular.element($window);
function AffixFactory(element, config) {
var $affix = {};
var options = angular.extend({}, defaults, config);
var targetEl = options.target;
var reset = 'affix affix-top affix-bottom';
var setWidth = false;
var initialAffixTop = 0;
var initialOffsetTop = 0;
var offsetTop = 0;
var offsetBottom = 0;
var affixed = null;
var unpin = null;
var parent = element.parent();
if (options.offsetParent) {
if (options.offsetParent.match(/^\d+$/)) {
for (var i = 0; i < options.offsetParent * 1 - 1; i++) {
parent = parent.parent();
}
} else {
parent = angular.element(options.offsetParent);
}
}
$affix.init = function() {
this.$parseOffsets();
initialOffsetTop = dimensions.offset(element[0]).top + initialAffixTop;
setWidth = !element[0].style.width;
targetEl.on('scroll', this.checkPosition);
targetEl.on('click', this.checkPositionWithEventLoop);
windowEl.on('resize', this.$debouncedOnResize);
this.checkPosition();
this.checkPositionWithEventLoop();
};
$affix.destroy = function() {
targetEl.off('scroll', this.checkPosition);
targetEl.off('click', this.checkPositionWithEventLoop);
windowEl.off('resize', this.$debouncedOnResize);
};
$affix.checkPositionWithEventLoop = function() {
setTimeout($affix.checkPosition, 1);
};
$affix.checkPosition = function() {
var scrollTop = getScrollTop();
var position = dimensions.offset(element[0]);
var elementHeight = dimensions.height(element[0]);
var affix = getRequiredAffixClass(unpin, position, elementHeight);
if (affixed === affix) return;
affixed = affix;
if (affix === 'top') {
unpin = null;
if (setWidth) {
element.css('width', '');
}
if (options.inlineStyles) {
element.css('position', options.offsetParent ? '' : 'relative');
element.css('top', '');
}
} else if (affix === 'bottom') {
if (options.offsetUnpin) {
unpin = -(options.offsetUnpin * 1);
} else {
unpin = position.top - scrollTop;
}
if (setWidth) {
element.css('width', '');
}
if (options.inlineStyles) {
element.css('position', options.offsetParent ? '' : 'relative');
element.css('top', options.offsetParent ? '' : bodyEl[0].offsetHeight - offsetBottom - elementHeight - initialOffsetTop + 'px');
}
} else {
unpin = null;
if (setWidth) {
element.css('width', element[0].offsetWidth + 'px');
}
if (options.inlineStyles) {
element.css('position', 'fixed');
element.css('top', initialAffixTop + 'px');
}
}
element.removeClass(reset).addClass('affix' + (affix !== 'middle' ? '-' + affix : ''));
};
$affix.$onResize = function() {
$affix.$parseOffsets();
$affix.checkPosition();
};
$affix.$debouncedOnResize = debounce($affix.$onResize, 50);
$affix.$parseOffsets = function() {
var initialPosition = element.css('position');
if (options.inlineStyles) {
element.css('position', options.offsetParent ? '' : 'relative');
}
if (options.offsetTop) {
if (options.offsetTop === 'auto') {
options.offsetTop = '+0';
}
if (options.offsetTop.match(/^[-+]\d+$/)) {
initialAffixTop = -options.offsetTop * 1;
if (options.offsetParent) {
offsetTop = dimensions.offset(parent[0]).top + options.offsetTop * 1;
} else {
offsetTop = dimensions.offset(element[0]).top - dimensions.css(element[0], 'marginTop', true) + options.offsetTop * 1;
}
} else {
offsetTop = options.offsetTop * 1;
}
}
if (options.offsetBottom) {
if (options.offsetParent && options.offsetBottom.match(/^[-+]\d+$/)) {
offsetBottom = getScrollHeight() - (dimensions.offset(parent[0]).top + dimensions.height(parent[0])) + options.offsetBottom * 1 + 1;
} else {
offsetBottom = options.offsetBottom * 1;
}
}
if (options.inlineStyles) {
element.css('position', initialPosition);
}
};
function getRequiredAffixClass(_unpin, position, elementHeight) {
var scrollTop = getScrollTop();
var scrollHeight = getScrollHeight();
if (scrollTop <= offsetTop) {
return 'top';
} else if (_unpin !== null && scrollTop + _unpin <= position.top) {
return 'middle';
} else if (offsetBottom !== null && position.top + elementHeight + initialAffixTop >= scrollHeight - offsetBottom) {
return 'bottom';
}
return 'middle';
}
function getScrollTop() {
return targetEl[0] === $window ? $window.pageYOffset : targetEl[0].scrollTop;
}
function getScrollHeight() {
return targetEl[0] === $window ? $window.document.body.scrollHeight : targetEl[0].scrollHeight;
}
$affix.init();
return $affix;
}
return AffixFactory;
} ];
}).directive('bsAffix', [ '$affix', '$window', function($affix, $window) {
return {
restrict: 'EAC',
require: '^?bsAffixTarget',
link: function postLink(scope, element, attr, affixTarget) {
var options = {
scope: scope,
target: affixTarget ? affixTarget.$element : angular.element($window)
};
angular.forEach([ 'offsetTop', 'offsetBottom', 'offsetParent', 'offsetUnpin', 'inlineStyles' ], function(key) {
if (angular.isDefined(attr[key])) {
var option = attr[key];
if (/true/i.test(option)) option = true;
if (/false/i.test(option)) option = false;
options[key] = option;
}
});
var affix = $affix(element, options);
scope.$on('$destroy', function() {
if (affix) affix.destroy();
options = null;
affix = null;
});
}
};
} ]).directive('bsAffixTarget', function() {
return {
controller: [ '$element', function($element) {
this.$element = $element;
} ]
};
});