js/dropdown.js
(function ($) {
// Add posibility to scroll to selected option
// usefull for select for example
$.fn.scrollTo = function(elem) {
$(this).scrollTop($(this).scrollTop() - $(this).offset().top + $(elem).offset().top);
return this;
};
$.fn.dropdown = function (options) {
var defaults = {
inDuration: 300,
outDuration: 225,
constrainWidth: true, // Constrains width of dropdown to the activator
hover: false,
gutter: 0, // Spacing from edge
belowOrigin: false,
alignment: 'left',
stopPropagation: false
};
// Open dropdown.
if (options === "open") {
this.each(function() {
$(this).trigger('open');
});
return false;
}
// Close dropdown.
if (options === "close") {
this.each(function() {
$(this).trigger('close');
});
return false;
}
this.each(function(){
var origin = $(this);
var curr_options = $.extend({}, defaults, options);
var isFocused = false;
// Dropdown menu
var activates = $("#"+ origin.attr('data-activates'));
function updateOptions() {
if (origin.data('induration') !== undefined)
curr_options.inDuration = origin.data('induration');
if (origin.data('outduration') !== undefined)
curr_options.outDuration = origin.data('outduration');
if (origin.data('constrainwidth') !== undefined)
curr_options.constrainWidth = origin.data('constrainwidth');
if (origin.data('hover') !== undefined)
curr_options.hover = origin.data('hover');
if (origin.data('gutter') !== undefined)
curr_options.gutter = origin.data('gutter');
if (origin.data('beloworigin') !== undefined)
curr_options.belowOrigin = origin.data('beloworigin');
if (origin.data('alignment') !== undefined)
curr_options.alignment = origin.data('alignment');
if (origin.data('stoppropagation') !== undefined)
curr_options.stopPropagation = origin.data('stoppropagation');
}
updateOptions();
// Attach dropdown to its activator
origin.after(activates);
/*
Helper function to position and resize dropdown.
Used in hover and click handler.
*/
function placeDropdown(eventType) {
// Check for simultaneous focus and click events.
if (eventType === 'focus') {
isFocused = true;
}
// Check html data attributes
updateOptions();
// Set Dropdown state
activates.addClass('active');
origin.addClass('active');
var originWidth = origin[0].getBoundingClientRect().width;
// Constrain width
if (curr_options.constrainWidth === true) {
activates.css('width', originWidth);
} else {
activates.css('white-space', 'nowrap');
}
// Offscreen detection
var windowHeight = window.innerHeight;
var originHeight = origin.innerHeight();
var offsetLeft = origin.offset().left;
var offsetTop = origin.offset().top - $(window).scrollTop();
var currAlignment = curr_options.alignment;
var gutterSpacing = 0;
var leftPosition = 0;
// Below Origin
var verticalOffset = 0;
if (curr_options.belowOrigin === true) {
verticalOffset = originHeight;
}
// Check for scrolling positioned container.
var scrollYOffset = 0;
var scrollXOffset = 0;
var wrapper = origin.parent();
if (!wrapper.is('body')) {
if (wrapper[0].scrollHeight > wrapper[0].clientHeight) {
scrollYOffset = wrapper[0].scrollTop;
}
if (wrapper[0].scrollWidth > wrapper[0].clientWidth) {
scrollXOffset = wrapper[0].scrollLeft;
}
}
if (offsetLeft + activates.innerWidth() > $(window).width()) {
// Dropdown goes past screen on right, force right alignment
currAlignment = 'right';
} else if (offsetLeft - activates.innerWidth() + origin.innerWidth() < 0) {
// Dropdown goes past screen on left, force left alignment
currAlignment = 'left';
}
// Vertical bottom offscreen detection
if (offsetTop + activates.innerHeight() > windowHeight) {
// If going upwards still goes offscreen, just crop height of dropdown.
if (offsetTop + originHeight - activates.innerHeight() < 0) {
var adjustedHeight = windowHeight - offsetTop - verticalOffset;
activates.css('max-height', adjustedHeight);
} else {
// Flow upwards.
if (!verticalOffset) {
verticalOffset += originHeight;
}
verticalOffset -= activates.innerHeight();
}
}
// Handle edge alignment
if (currAlignment === 'left') {
gutterSpacing = curr_options.gutter;
leftPosition = origin.position().left + gutterSpacing;
}
else if (currAlignment === 'right') {
// Material icons fix
activates
.stop(true, true)
.css({
opacity: 0,
left: 0
})
var offsetRight = origin.position().left + originWidth - activates.width();
gutterSpacing = -curr_options.gutter;
leftPosition = offsetRight + gutterSpacing;
}
// Position dropdown
activates.css({
position: 'absolute',
top: origin.position().top + verticalOffset + scrollYOffset,
left: leftPosition + scrollXOffset
});
// Show dropdown
activates
.slideDown({
queue: false,
duration: curr_options.inDuration,
easing: 'easeOutCubic',
complete: function() {
$(this).css('height', '');
}
})
.animate( {opacity: 1}, {queue: false, duration: curr_options.inDuration, easing: 'easeOutSine'});
// Add click close handler to document
setTimeout(function() {
$(document).on('click.'+ activates.attr('id'), function (e) {
hideDropdown();
$(document).off('click.'+ activates.attr('id'));
});
}, 0);
}
function hideDropdown() {
// Check for simultaneous focus and click events.
isFocused = false;
activates.fadeOut(curr_options.outDuration);
activates.removeClass('active');
origin.removeClass('active');
$(document).off('click.'+ activates.attr('id'));
setTimeout(function() { activates.css('max-height', ''); }, curr_options.outDuration);
}
// Hover
if (curr_options.hover) {
var open = false;
origin.off('click.' + origin.attr('id'));
// Hover handler to show dropdown
origin.on('mouseenter', function(e){ // Mouse over
if (open === false) {
placeDropdown();
open = true;
}
});
origin.on('mouseleave', function(e){
// If hover on origin then to something other than dropdown content, then close
var toEl = e.toElement || e.relatedTarget; // added browser compatibility for target element
if(!$(toEl).closest('.dropdown-content').is(activates)) {
activates.stop(true, true);
hideDropdown();
open = false;
}
});
activates.on('mouseleave', function(e){ // Mouse out
var toEl = e.toElement || e.relatedTarget;
if(!$(toEl).closest('.dropdown-button').is(origin)) {
activates.stop(true, true);
hideDropdown();
open = false;
}
});
// Click
} else {
// Click handler to show dropdown
origin.off('click.' + origin.attr('id'));
origin.on('click.'+origin.attr('id'), function(e){
if (!isFocused) {
if ( origin[0] == e.currentTarget &&
!origin.hasClass('active') &&
($(e.target).closest('.dropdown-content').length === 0)) {
e.preventDefault(); // Prevents button click from moving window
if (curr_options.stopPropagation) {
e.stopPropagation();
}
placeDropdown('click');
}
// If origin is clicked and menu is open, close menu
else if (origin.hasClass('active')) {
hideDropdown();
$(document).off('click.'+ activates.attr('id'));
}
}
});
} // End else
// Listen to open and close event - useful for select component
origin.on('open', function(e, eventType) {
placeDropdown(eventType);
});
origin.on('close', hideDropdown);
});
}; // End dropdown plugin
$(document).ready(function(){
$('.dropdown-button').dropdown();
});
}( jQuery ));