dropdown.js
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(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 (option) {
var defaults = {
inDuration: 300,
outDuration: 225,
constrain_width: true, // Constrains width of dropdown to the activator
hover: false,
gutter: 0, // Spacing from edge
belowOrigin: false,
alignment: 'left'
};
this.each(function(){
var origin = $(this);
var options = $.extend({}, defaults, option);
// Dropdown menu
var activates = $("#"+ origin.attr('data-activates'));
function updateOptions() {
if (origin.data('induration') !== undefined)
options.inDuration = origin.data('inDuration');
if (origin.data('outduration') !== undefined)
options.outDuration = origin.data('outDuration');
if (origin.data('constrainwidth') !== undefined)
options.constrain_width = origin.data('constrainwidth');
if (origin.data('hover') !== undefined)
options.hover = origin.data('hover');
if (origin.data('gutter') !== undefined)
options.gutter = origin.data('gutter');
if (origin.data('beloworigin') !== undefined)
options.belowOrigin = origin.data('beloworigin');
if (origin.data('alignment') !== undefined)
options.alignment = origin.data('alignment');
}
updateOptions();
// Attach dropdown to its activator
origin.after(activates);
/*
Helper function to position and resize dropdown.
Used in hover and click handler.
*/
function placeDropdown() {
// Check html data attributes
updateOptions();
// Set Dropdown state
activates.addClass('active');
// Constrain width
if (options.constrain_width === true) {
activates.css('width', origin.outerWidth());
}
else {
activates.css('white-space', 'nowrap');
}
var offset = 0;
if (options.belowOrigin === true) {
offset = origin.height();
}
// Offscreen detection
var offsetLeft = origin.offset().left;
var activatesLeft, width_difference, gutter_spacing;
if (offsetLeft + activates.innerWidth() > $(window).width()) {
options.alignment = 'right';
}
else if (offsetLeft - activates.innerWidth() + origin.innerWidth() < 0) {
options.alignment = 'left';
}
// Handle edge alignment
if (options.alignment === 'left') {
width_difference = 0;
gutter_spacing = options.gutter;
activatesLeft = origin.position().left + width_difference + gutter_spacing;
// Position dropdown
activates.css({ left: activatesLeft });
}
else if (options.alignment === 'right') {
var offsetRight = $(window).width() - offsetLeft - origin.innerWidth();
width_difference = 0;
gutter_spacing = options.gutter;
activatesLeft = ( $(window).width() - origin.position().left - origin.innerWidth() ) + gutter_spacing;
// Position dropdown
activates.css({ right: activatesLeft });
}
// Position dropdown
activates.css({
position: 'absolute',
top: origin.position().top + offset,
});
// Show dropdown
activates.stop(true, true).css('opacity', 0)
.slideDown({
queue: false,
duration: options.inDuration,
easing: 'easeOutCubic',
complete: function() {
$(this).css('height', '');
}
})
.animate( {opacity: 1}, {queue: false, duration: options.inDuration, easing: 'easeOutSine'});
}
function hideDropdown() {
activates.fadeOut(options.outDuration);
activates.removeClass('active');
}
// Hover
if (options.hover) {
var open = false;
origin.unbind('click.' + origin.attr('id'));
// Hover handler to show dropdown
origin.on('mouseenter', function(e){ // Mouse over
if (open === false) {
placeDropdown();
open = true;
}
});
origin.on('mouseleave', function(e){
// If hover on origin then to something other than dropdown content, then close
var toEl = e.toElement || e.relatedTarget; // added browser compatibility for target element
if(!$(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(!$(toEl).closest('.dropdown-button').is(origin)) {
activates.stop(true, true);
hideDropdown();
open = false;
}
});
// Click
} else {
// Click handler to show dropdown
origin.unbind('click.' + origin.attr('id'));
origin.bind('click.'+origin.attr('id'), function(e){
if ( origin[0] == e.currentTarget && ($(e.target).closest('.dropdown-content').length === 0) ) {
e.preventDefault(); // Prevents button click from moving window
placeDropdown();
}
// If origin is clicked and menu is open, close menu
else {
if (origin.hasClass('active')) {
hideDropdown();
$(document).unbind('click.' + activates.attr('id'));
}
}
// If menu open, add click close handler to document
if (activates.hasClass('active')) {
$(document).bind('click.'+ activates.attr('id'), function (e) {
if (!activates.is(e.target) && !origin.is(e.target) && (!origin.find(e.target).length > 0) ) {
hideDropdown();
$(document).unbind('click.' + activates.attr('id'));
}
});
}
});
} // End else
// Listen to open and close event - useful for select component
origin.on('open', placeDropdown);
origin.on('close', hideDropdown);
});
}; // End dropdown plugin
$(document).ready(function(){
$('.dropdown-button').dropdown();
});
}( jQuery ));