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define([
'jquery',
'../utils',
'../keys'
], function ($, Utils, KEYS) {
function BaseSelection ($element, options) {
this.$element = $element;
this.options = options;
BaseSelection.__super__.constructor.call(this);
}
Utils.Extend(BaseSelection, Utils.Observable);
BaseSelection.prototype.render = function () {
var $selection = $(
'<span class="select2-selection" role="combobox" ' +
' aria-haspopup="true" aria-expanded="false">' +
'</span>'
);
this._tabindex = 0;
if (this.$element.data('old-tabindex') != null) {
this._tabindex = this.$element.data('old-tabindex');
} else if (this.$element.attr('tabindex') != null) {
this._tabindex = this.$element.attr('tabindex');
}
$selection.attr('title', this.$element.attr('title'));
$selection.attr('tabindex', this._tabindex);
this.$selection = $selection;
return $selection;
};
BaseSelection.prototype.bind = function (container, $container) {
var self = this;
var id = container.id + '-container';
var resultsId = container.id + '-results';
this.container = container;
this.$selection.on('focus', function (evt) {
self.trigger('focus', evt);
});
this.$selection.on('blur', function (evt) {
self._handleBlur(evt);
});
this.$selection.on('keydown', function (evt) {
self.trigger('keypress', evt);
if (evt.which === KEYS.SPACE) {
evt.preventDefault();
}
});
container.on('results:focus', function (params) {
self.$selection.attr('aria-activedescendant', params.data._resultId);
});
container.on('selection:update', function (params) {
self.update(params.data);
});
container.on('open', function () {
// When the dropdown is open, aria-expanded="true"
self.$selection.attr('aria-expanded', 'true');
self.$selection.attr('aria-owns', resultsId);
self._attachCloseHandler(container);
});
container.on('close', function () {
// When the dropdown is closed, aria-expanded="false"
self.$selection.attr('aria-expanded', 'false');
self.$selection.removeAttr('aria-activedescendant');
self.$selection.removeAttr('aria-owns');
self.$selection.focus();
self._detachCloseHandler(container);
});
container.on('enable', function () {
self.$selection.attr('tabindex', self._tabindex);
});
container.on('disable', function () {
self.$selection.attr('tabindex', '-1');
});
};
BaseSelection.prototype._handleBlur = function (evt) {
var self = this;
// This needs to be delayed as the active element is the body when the tab
// key is pressed, possibly along with others.
window.setTimeout(function () {
// Don't trigger `blur` if the focus is still in the selection
if (
(document.activeElement == self.$selection[0]) ||
($.contains(self.$selection[0], document.activeElement))
) {
return;
}
self.trigger('blur', evt);
}, 1);
};
BaseSelection.prototype._attachCloseHandler = function (container) {
var self = this;
$(document.body).on('mousedown.select2.' + container.id, function (e) {
var $target = $(e.target);
var $select = $target.closest('.select2');
var $all = $('.select2.select2-container--open');
$all.each(function () {
var $this = $(this);
if (this == $select[0]) {
return;
}
var $element = $this.data('element');
$element.select2('close');
});
});
};
BaseSelection.prototype._detachCloseHandler = function (container) {
$(document.body).off('mousedown.select2.' + container.id);
};
BaseSelection.prototype.position = function ($selection, $container) {
var $selectionContainer = $container.find('.selection');
$selectionContainer.append($selection);
};
BaseSelection.prototype.destroy = function () {
this._detachCloseHandler(this.container);
};
BaseSelection.prototype.update = function (data) {
throw new Error('The `update` method must be defined in child classes.');
};
return BaseSelection;
});
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