/* --------------------------------------------------------------
multi_select.js 2016-11-08
Gambio GmbH
http://www.gambio.de
Copyright (c) 2016 Gambio GmbH
Released under the GNU General Public License (Version 2)
[http://www.gnu.org/licenses/gpl-2.0.html]
--------------------------------------------------------------
*/
/**
* ## Multi Select Widget
*
* This module serves as a wrapper of SumoSelect, a jQuery plugin that provides enhanced select-box functionality.
* Bind this widget to a parent container and mark each child select-box element with the `data-multi_select-instance`
* attribute.
*
* After the initialization of the widget all the marked elements will be converted into SumoSelect instances.
*
* ### Options
*
* **Options Source | `data-multi_select-source` | String | Optional**
*
* Provide a URL that will be used to fetch the options of the select box. The widget will perform a GET request to
* the provided destination and expects a JSON array with the options:
*
* [
* {
* "value": "1",
* "text": "Option #1"
* },
* {
* "value": "2",
* "text": "Option #2"
* }
* ]
*
* You can also pass other configuration directly in the parent element which will be used for every child instance.
*
*
* ### Methods
*
* **Reload Options [AJAX]**
*
* You can use this method to refresh the options from the already provided data-multi_select-source or by providing
* a new URL which will also be set as the data-source of the element. If the multi select has no URL then it will just
* sync its values with the select element.
*
* * ```js
* $('#my-multi-select').multi_select('reload', 'http://shop.de/options/source/url');
* ```
*
* **Refresh Options**
*
* Update the multi-select widget with the state of the original select element. This method is useful after performing
* changes in the original element and need to display them in the multi-select widget.
*
* ```js
* $('#my-multi-select').multi_select('refresh');
* ```
*
* ### Events
* ```javascript
* // Triggered when the multi-select widget has performed a "reload" method (after the AJAX call).
* $('#my-multi-select').on('reload', function(event) {});
* ```
*
* ### Example
*
* ```html
* <form data-gx-widget="multi_select">
* <select data-multi_select-instance data-multi_select-source="http://shop.de/options-source-url"></select>
* </form>
* ```
*
* {@link http://hemantnegi.github.io/jquery.sumoselect}
*
* @module Admin/Widgets/multi_select
* @requires jQuery-SumoSelect
*/
gx.widgets.module('multi_select', [], function(data) {
'use strict';
// ------------------------------------------------------------------------
// VARIABLES
// ------------------------------------------------------------------------
/**
* Module Selector
*
* @type {jQuery}
*/
const $this = $(this);
/**
* Default Options
*
* @type {Object}
*/
const defaults = {
placeholder: jse.core.lang.translate('SELECT', 'general'),
selectAll: true,
csvDispCount: 2,
captionFormat: `{0} ${jse.core.lang.translate('selected', 'admin_labels')}`,
locale: [
'OK',
jse.core.lang.translate('CANCEL', 'general'),
jse.core.lang.translate('SELECT_ALL', 'general')
]
};
/**
* Final Options
*
* @type {Object}
*/
const options = $.extend(true, {}, defaults, data);
/**
* Module Instance
*
* @type {Object}
*/
const module = {};
// ------------------------------------------------------------------------
// FUNCTIONS
// ------------------------------------------------------------------------
/**
* Add the "multi_select" method to the jQuery prototype.
*/
function _addPublicMethod() {
if ($.fn.multi_select) {
return;
}
$.fn.extend({
multi_select: function(action, ...args) {
if (!$(this).is('select')) {
throw new Error('Called the "multi_select" method on an invalid object (select box expected).');
}
$.each(this, function() {
switch (action) {
case 'reload':
_reload($(this), ...args);
break;
case 'refresh':
_refresh(this);
}
});
}
});
}
/**
* Fill a select box with the provided options.
*
* @param {jQuery} $select The select box to be filled.
* @param {Object} options Array with { value: "...", "text": "..." } entries.
*/
function _fillSelect($select, options) {
$select.empty();
$.each(options, (index, option) => {
$select.append(new Option(option.text, option.value));
});
}
/**
* Reload the options from the source (data property) or the provided URL,
*
* @param {string} url Optional, if provided it will be used as the source of the data and will also update the
* data-source property of the element.
*/
function _reload($select, url) {
url = url || $select.data('source');
if (!url) {
throw new Error('Multi Select Reload: Neither URL nor data-source contain a URL value.');
}
$select.data('source', url);
$.getJSON(url)
.done(function(response) {
_fillSelect($select, response);
$select[0].sumo.reload();
$select.trigger('reload');
})
.fail(function(jqxhr, textStatus, errorThrown) {
jse.core.debug.error('Multi Select AJAX Error: ', jqxhr, textStatus, errorThrown);
});
}
/**
* Refresh the multi select instance depending the state of the original select element.
*
* @param {Node} select The DOM element to be refreshed.
*/
function _refresh(select) {
if (select.sumo === undefined) {
throw new Error('Multi Select Refresh: The provided select element is not an instance of SumoSelect.', select);
}
select.sumo.reload();
// Update the caption by simulating a click in an ".opt" element.
_overrideSelectAllCaption.apply($(select.parentNode).find('.opt')[0]);
}
/**
* Override the multi select caption when all elements are selected.
*
* This callback will override the caption because SumoSelect does not provide a setting for this text.
*/
function _overrideSelectAllCaption() {
const $optWrapper = $(this).parents('.optWrapper');
const allCheckboxesChecked = $optWrapper.find('.opt.selected').length === $optWrapper.find('.opt').length;
const atLeastOneCheckboxChecked = $optWrapper.find('.opt.selected').length > 0;
const $selectAllCheckbox = $optWrapper.find('.select-all');
$selectAllCheckbox.removeClass('partial-select');
if (allCheckboxesChecked) {
$optWrapper
.siblings('.CaptionCont')
.children('span')
.text(jse.core.lang.translate('all_selected', 'admin_labels'));
} else if (atLeastOneCheckboxChecked) {
$selectAllCheckbox.addClass('partial-select');
}
}
// ------------------------------------------------------------------------
// INITIALIZATION
// ------------------------------------------------------------------------
module.init = function(done) {
// Add public module method.
_addPublicMethod();
// Initialize the elements.
$this.find('[data-multi_select-instance]').each(function() {
const $select = $(this);
$select.removeAttr('data-multi_select-instance');
// Instantiate the widget without an AJAX request.
$select.SumoSelect(options);
if ($select.data('multi_selectSource') !== undefined) {
// Remove the data attribute and store the value internally with the 'source' key.
$select.data('source', $select.data('multi_selectSource'));
$select.removeAttr('data-multi_select-source');
// Fetch the options with an AJAX request.
$.getJSON($select.data('multi_selectSource'))
.done(function(response) {
_fillSelect($select, response);
$select[0].sumo.unload();
$select.SumoSelect(options);
$select.trigger('reload');
})
.fail(function(jqxhr, textStatus, errorThrown) {
jse.core.debug.error('Multi Select AJAX Error: ', jqxhr, textStatus, errorThrown);
});
}
});
done();
};
// When the user clicks on the "Select All" option update the text with a custom translations. This has to
// be done manually because there is no option for this text in SumoSelect.
$this.on('click', '.select-all, .opt', _overrideSelectAllCaption);
return module;
});