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// jquery.multi-select.js
// by mySociety
// https://github.com/mysociety/jquery-multi-select
;(function($) {
"use strict";
var pluginName = "multiSelect",
defaults = {
'containerHTML': '<div class="multi-select-container">',
'menuHTML': '<div class="multi-select-menu">',
'buttonHTML': '<span class="multi-select-button">',
'menuItemsHTML': '<div class="multi-select-menuitems">',
'menuItemHTML': '<label class="multi-select-menuitem">',
'presetsHTML': '<div class="multi-select-presets">',
'activeClass': 'multi-select-container--open',
'noneText': '-- Select --',
'allText': undefined,
'presets': undefined,
'positionedMenuClass': 'multi-select-container--positioned',
'positionMenuWithin': undefined,
'viewportBottomGutter': 20,
'menuMinHeight': 200
};
/**
* @constructor
*/
function MultiSelect(element, options) {
this.element = element;
this.$element = $(element);
this.settings = $.extend( {}, defaults, options );
this._defaults = defaults;
this._name = pluginName;
this.init();
}
function arraysAreEqual(array1, array2) {
if ( array1.length != array2.length ){
return false;
}
array1.sort();
array2.sort();
for ( var i = 0; i < array1.length; i++ ){
if ( array1[i] !== array2[i] ){
return false;
}
}
return true;
}
$.extend(MultiSelect.prototype, {
init: function() {
this.checkSuitableInput();
this.findLabels();
this.constructContainer();
this.constructButton();
this.constructMenu();
this.setUpBodyClickListener();
this.setUpLabelsClickListener();
this.$element.hide();
},
checkSuitableInput: function(text) {
if ( this.$element.is('select[multiple]') === false ) {
throw new Error('$.multiSelect only works on <select multiple> elements');
}
},
findLabels: function() {
this.$labels = $('label[for="' + this.$element.attr('id') + '"]');
},
constructContainer: function() {
this.$container = $(this.settings['containerHTML']);
this.$element.data('multi-select-container', this.$container);
this.$container.insertAfter(this.$element);
},
constructButton: function() {
var _this = this;
this.$button = $(this.settings['buttonHTML']);
this.$button.attr({
'role': 'button',
'aria-haspopup': 'true',
'tabindex': 0,
'aria-label': this.$labels.eq(0).text()
})
.on('keydown.multiselect', function(e) {
var key = e.which;
var returnKey = 13;
var spaceKey = 32;
if ((key === returnKey) || (key === spaceKey)) {
_this.$button.click();
}
}).on('click.multiselect', function(e) {
_this.menuToggle();
})
.appendTo(this.$container);
this.$element.on('change.multiselect', function() {
_this.updateButtonContents();
});
this.updateButtonContents();
},
updateButtonContents: function() {
var _this = this;
var options = [];
var selected = [];
this.$element.children('option').each(function() {
var text = /** @type string */ ($(this).text());
options.push(text);
if ($(this).is(':selected')) {
selected.push( $.trim(text) );
}
});
this.$button.empty();
if (selected.length == 0) {
this.$button.text( this.settings['noneText'] );
} else if ( (selected.length === options.length) && this.settings['allText']) {
this.$button.text( this.settings['allText'] );
} else {
this.$button.text( selected.join(', ') );
}
},
constructMenu: function() {
var _this = this;
this.$menu = $(this.settings['menuHTML']);
this.$menu.attr({
'role': 'menu'
}).on('keyup.multiselect', function(e){
var key = e.which;
var escapeKey = 27;
if (key === escapeKey) {
_this.menuHide();
}
})
.appendTo(this.$container);
this.constructMenuItems();
if ( this.settings['presets'] ) {
this.constructPresets();
}
},
constructMenuItems: function() {
var _this = this;
this.$menuItems = $(this.settings['menuItemsHTML']);
this.$menu.append(this.$menuItems);
this.$element.on('change.multiselect', function(e, internal) {
// Don't need to update the menu items if this
// change event was fired by our tickbox handler.
if(internal !== true){
_this.updateMenuItems();
}
});
this.updateMenuItems();
},
updateMenuItems: function() {
var _this = this;
this.$menuItems.empty();
this.$element.children('option').each(function(option_index, option) {
var $item = _this.constructMenuItem($(option), option_index);
_this.$menuItems.append($item);
});
},
constructPresets: function() {
var _this = this;
this.$presets = $(this.settings['presetsHTML']);
this.$menu.prepend(this.$presets);
$.each(this.settings['presets'], function(i, preset){
var unique_id = _this.$element.attr('name') + '_preset_' + i;
var $item = $(_this.settings['menuItemHTML'])
.attr({
'for': unique_id,
'role': 'menuitem'
})
.text(' ' + preset.name)
.appendTo(_this.$presets);
var $input = $('<input>')
.attr({
'type': 'radio',
'name': _this.$element.attr('name') + '_presets',
'id': unique_id
})
.prependTo($item);
$input.on('change.multiselect', function(){
_this.$element.val(preset.options);
_this.$element.trigger('change');
});
});
this.$element.on('change.multiselect', function() {
_this.updatePresets();
});
this.updatePresets();
},
updatePresets: function() {
var _this = this;
$.each(this.settings['presets'], function(i, preset){
var unique_id = _this.$element.attr('name') + '_preset_' + i;
var $input = _this.$presets.find('#' + unique_id);
if ( arraysAreEqual(preset.options || [], _this.$element.val() || []) ){
$input.prop('checked', true);
} else {
$input.prop('checked', false);
}
});
},
constructMenuItem: function($option, option_index) {
var unique_id = this.$element.attr('name') + '_' + option_index;
var $item = $(this.settings['menuItemHTML'])
.attr({
'for': unique_id,
'role': 'menuitem'
})
.text(' ' + $option.text());
var $input = $('<input>')
.attr({
'type': 'checkbox',
'id': unique_id,
'value': $option.val()
})
.prependTo($item);
if ( $option.is(':disabled') ) {
$input.attr('disabled', 'disabled');
}
if ( $option.is(':selected') ) {
$input.prop('checked', 'checked');
}
$input.on('change.multiselect', function() {
if ($(this).prop('checked')) {
$option.prop('selected', true);
} else {
$option.prop('selected', false);
}
// .prop() on its own doesn't generate a change event.
// Other plugins might want to do stuff onChange.
$option.trigger('change', [true]);
});
return $item;
},
setUpBodyClickListener: function() {
var _this = this;
// Hide the $menu when you click outside of it.
$('html').on('click.multiselect', function(){
_this.menuHide();
});
// Stop click events from inside the $button or $menu from
// bubbling up to the body and closing the menu!
this.$container.on('click.multiselect', function(e){
e.stopPropagation();
});
},
setUpLabelsClickListener: function() {
var _this = this;
this.$labels.on('click.multiselect', function(e) {
e.preventDefault();
e.stopPropagation();
_this.menuToggle();
});
},
menuShow: function() {
$('html').trigger('click.multiselect'); // Close any other open menus
this.$container.addClass(this.settings['activeClass']);
if ( this.settings['positionMenuWithin'] && this.settings['positionMenuWithin'] instanceof $ ) {
var menuLeftEdge = this.$menu.offset().left + this.$menu.outerWidth();
var withinLeftEdge = this.settings['positionMenuWithin'].offset().left +
this.settings['positionMenuWithin'].outerWidth();
if ( menuLeftEdge > withinLeftEdge ) {
this.$menu.css( 'width', (withinLeftEdge - this.$menu.offset().left) );
this.$container.addClass(this.settings['positionedMenuClass']);
}
}
var menuBottom = this.$menu.offset().top + this.$menu.outerHeight();
var viewportBottom = $(window).scrollTop() + $(window).height();
if ( menuBottom > viewportBottom - this.settings['viewportBottomGutter'] ) {
this.$menu.css({
'maxHeight': Math.max(
viewportBottom - this.settings['viewportBottomGutter'] - this.$menu.offset().top,
this.settings['menuMinHeight']
),
'overflow': 'scroll'
});
} else {
this.$menu.css({
'maxHeight': '',
'overflow': ''
});
}
},
menuHide: function() {
this.$container.removeClass(this.settings['activeClass']);
this.$container.removeClass(this.settings['positionedMenuClass']);
this.$menu.css('width', 'auto');
},
menuToggle: function() {
if ( this.$container.hasClass(this.settings['activeClass']) ) {
this.menuHide();
} else {
this.menuShow();
}
}
});
$.fn[ pluginName ] = function(options) {
return this.each(function() {
if ( !$.data(this, "plugin_" + pluginName) ) {
$.data(this, "plugin_" + pluginName,
new MultiSelect(this, options) );
}
});
};
})(jQuery);