jQueryLike.js

;(function(window){
	var S = function(selector, context) {
		return new DOM(selector, context);
	};

	var DOM = function(selector, context) {
		var currentContext = document;
		if (context) {
			if (context.nodeType) {
				currentContext = context;
			} else {
				currentContext = document.querySelector(context);
			}
		}
		if (!selector) {
			this.length = 0;
			return this;
		}

		if (typeof selector === 'object' && selector.nodeName) {
			this.length = 1;
			this[0] = selector;
			return this;
		}

		var nodes;
		if (typeof selector !== 'string') {
			nodes = selector;
		} else {
			nodes = currentContext.querySelectorAll(selector.trim());
		}

		var nodesLength = nodes.length, i;
		for(i = 0; i < nodesLength; i = i + 1) {
			this[i] = nodes[i];
		}

		this.length = nodesLength;
		return this;
	};

	window.S = S;
	S.fn = DOM.prototype;
}(window));



S.split = function(str, rule) {
	rule = rule || ' ';
	return str.trim().split(rule);
};

S.isString = function(str) {
	return typeof str === 'string';
};

S.isObject = function(obj) {
	return typeof obj === 'object' && obj !== null;
};

S.isArray = function(arr) {
	return Array.isArray(arr);
}

S.test = function(feature) {
	return !!this[0][feature];
};

S._classes = function(action) {
	return function (classes) {
		if (!classes) return this;
		if (S.isString(classes)) classes = S.split(classes);

		var l = classes.length;

		if (!S.isArray(classes) || l === 0) return this;

		if (this[0].classList) {
			return this.each(function() {
				var self = this;
				classes.forEach(function(cl) {
					self.classList[action](cl);
				});
			});
		} 
		
		return this.each(function() {
			var self = this;
			classes.forEach(function(cl) {
				if (action === 'add') self.className += ' ' + cl;
				if (action === 'remove') self.className.replace(new RegExp('(^|\\b)' + cl + '(\\b|$)', 'gi'), ' ');
			});
		});

	}
};


S.fn.toArray = function() {
	var elementsArray = [];
	this.each(function(){
		elementsArray.push(this);
	});

	return elementsArray;
};

S.fn.each = function(callback) {
	var l = this.length, i;
	for (i = 0; i < l; i = i + 1) {
		callback.call(this[i], i, this[i]);
	}
	return this;
};


S.fn.html = function(string) {
	if (string) {
		return this.each(function() {
			this.innerHTML = string;
		});
	}
	return this[0].innerHTML;
};


S.fn.text = function(string) {
	if (string) {
		return this.each(function() {
			this.textContent = string;
		});
	}
	return this[0].textContent.trim();
};


S.fn.append = function(selector) {
	if (S.isString(selector)) {
		return this.each(function() {
			this.insertAdjacentHTML('beforeend', selector);
		});
	} else {
		return this.each(function(){
			var self = this;
			S(selector).each(function(name, value) {
				self.insertAdjacentHTML('beforeend', value.outerHTML);
			}); 
		});
	}
};


S.fn.css = function(properties, value) {
	if (S.isString(properties)) {
		if (value) {
			return this.each(function(){
				this.style[properties] = value;
			});	
		}
		else {
			return window.getComputedStyle(this[0])[properties];
		}
	}

	if (S.isObject(properties)) {
		return this.each(function() {
			for (var property in properties) {
				this.style[property] = properties[property];
			}
		});
	}
};

S.fn.show = function() {
	return this.css('display', 'block');
};

S.fn.hide = function() {
	return this.css('display', 'none');
};



S.fn.next = function() {
	return S(this[0].nextElementSibling);
};

S.fn.prev = function() {
	return S(this[0].previousElementSibling);
};

S.fn.addClass = S._classes('add');

S.fn.removeClass = S._classes('remove');

S.fn.hasClass = function(className) {
	if (!className) return false;
	if (S.test('classList')) return this[0].classList.contains(className);
	else return new RegExp('(^| )' + className + '( |$)', 'gi').test(this[0].className);
};

S.fn.toggleClass = function(className) {
	return this.each(function() {
		var Sthis = S(this);
		if (Sthis.hasClass(className)) Sthis.removeClass(className);
		else Sthis.addClass(className);
	});
};

S.fn.on = function(type, handler) {
	if (this[0].addEventListener) {
		return this.each(function() {
			this.addEventListener(type, handler);
		});
	} else {
		return this.each(function() {
			var self = this;
			self.attachEvent('on' + type, function(){
	      handler.call(self);
	    });
		});
	}
};

S.fn.off = function(type, handler) {
	if (this[0].removeEventListener) {
		return this.each(function() {
			this.removeEventListener(type, handler);
		});
	} else {
		return this.each(function() {
			this.detachEvent('on' + type, handler)
		});
	}
}

S.fn.fullHeight = function() {
	var element = this[0],
			height = window.getComputedStyle(element).height;
	if (height === 'auto' || height === '0px') {
		S(element).css('display', 'block');
		var styles = window.getComputedStyle(element);
		var properties = {
			height: styles.height,
			paddingTop: styles.paddingTop,
			paddingBottom: styles.paddingBottom,
			marginTop: styles.marginTop,
			marginBottom: styles.marginBottom
		};
		S(element).css('display', 'none');
	}

	return properties;
};

S.fn.slide = function(direction, duration) {
	duration = duration || 250;

	return this.each(function(){
		var Sthis = S(this);
		var fullHeight = Sthis.fullHeight();

		Sthis.css({
			transition: 'all '+ duration +'ms linear'
		});

		if (direction === 'down') {
			Sthis.css({
				display: 'block',
				height: 0, 
				paddingTop: 0,
				paddingBottom: 0,
				marginTop: 0,
				marginBottom: 0
			});
		}

		Sthis.css({
			display: 'block',
			height: 0, 
			paddingTop: 0,
			paddingBottom: 0,
			marginTop: 0,
			marginBottom: 0,
			transition: 'all '+ duration +'ms linear'
		});

		setTimeout(function(){
			console.log(fullHeight);
			Sthis.css({
				height: fullHeight.height, 
				paddingTop: fullHeight.paddingTop,
				paddingBottom: fullHeight.paddingBottom,
				marginTop: fullHeight.marginTop,
				marginBottom: fullHeight.marginBottom
			});
		}, 0);

	});
};