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allowClear.js
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allowClear.js
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define([
'jquery',
'../keys'
], function ($, KEYS) {
function AllowClear () { }
AllowClear.prototype.bind = function (decorated, container, $container) {
var self = this;
decorated.call(this, container, $container);
if (this.placeholder == null) {
if (this.options.get('debug') && window.console && console.error) {
console.error(
'Select2: The `allowClear` option should be used in combination ' +
'with the `placeholder` option.'
);
}
}
this.$selection.on('mousedown', '.select2-selection__clear',
function (evt) {
self._handleClear(evt);
});
container.on('keypress', function (evt) {
self._handleKeyboardClear(evt, container);
});
};
AllowClear.prototype._handleClear = function (_, evt) {
// Ignore the event if it is disabled
if (this.options.get('disabled')) {
return;
}
var $clear = this.$selection.find('.select2-selection__clear');
// Ignore the event if nothing has been selected
if ($clear.length === 0) {
return;
}
evt.stopPropagation();
var data = $clear.data('data');
var previousVal = this.$element.val();
this.$element.val(this.placeholder.id);
for (var d = 0; d < data.length; d++) {
var unselectData = {
data: data[d]
};
// Trigger the `unselect` event, so people can prevent it from being
// cleared.
this.trigger('unselect', unselectData);
// If the event was prevented, don't clear it out.
if (unselectData.prevented) {
this.$element.val(previousVal);
return;
}
}
this.$element.trigger('change');
this.trigger('toggle', {});
};
AllowClear.prototype._handleKeyboardClear = function (_, evt, container) {
if (container.isOpen()) {
return;
}
if (evt.which == KEYS.DELETE || evt.which == KEYS.BACKSPACE) {
this._handleClear(evt);
}
};
AllowClear.prototype.update = function (decorated, data) {
decorated.call(this, data);
if (this.$selection.find('.select2-selection__placeholder').length > 0 ||
data.length === 0) {
return;
}
var $remove = $(
'<span class="select2-selection__clear">' +
'×' +
'</span>'
);
$remove.data('data', data);
this.$selection.find('.select2-selection__rendered').prepend($remove);
};
return AllowClear;
});