# all files / src/widgets/ ComboBoxInputWidget.js

72.41% Statements 42/58
59.09% Branches 13/22
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     /**
     * ComboBoxInputWidgets combine a {@link OO.ui.TextInputWidget text input} (where a value
     * can be entered manually) and a {@link OO.ui.MenuSelectWidget menu of options} (from which
     * a value can be chosen instead). Users can choose options from the combo box in one of two ways:
     *
     * - by typing a value in the text input field. If the value exactly matches the value of a menu
     *   option, that option will appear to be selected.
     * - by choosing a value from the menu. The value of the chosen option will then appear in the text
     *   input field.
     *
     * After the user chooses an option, its `data` will be used as a new value for the widget.
     * A `label` also can be specified for each option: if given, it will be shown instead of the
     * `data` in the dropdown menu.
     *
     * This widget can be used inside an HTML form, such as a OO.ui.FormLayout.
     *
     * For more information about menus and options, please see the [OOUI documentation on MediaWiki][1].
     *
     *     @example
     *     // Example: A ComboBoxInputWidget.
     *     var comboBox = new OO.ui.ComboBoxInputWidget( {
     *         value: 'Option 1',
     *         options: [
     *             { data: 'Option 1' },
     *             { data: 'Option 2' },
     *             { data: 'Option 3' }
     *         ]
     *     } );
     *     $( 'body' ).append( comboBox.$element );
     *
     *     @example
     *     // Example: A ComboBoxInputWidget with additional option labels.
     *     var comboBox = new OO.ui.ComboBoxInputWidget( {
     *         value: 'Option 1',
     *         options: [
     *             {
     *                 data: 'Option 1',
     *                 label: 'Option One'
     *             },
     *             {
     *                 data: 'Option 2',
     *                 label: 'Option Two'
     *             },
     *             {
     *                 data: 'Option 3',
     *                 label: 'Option Three'
     *             }
     *         ]
     *     } );
     *     $( 'body' ).append( comboBox.$element );
     *
     * [1]: https://www.mediawiki.org/wiki/OOUI/Widgets/Selects_and_Options#Menu_selects_and_options
     *
     * @class
     * @extends OO.ui.TextInputWidget
     *
     * @constructor
     * @param {Object} [config] Configuration options
     * @cfg {Object[]} [options=[]] Array of menu options in the format `{ data: …, label: … }`
     * @cfg {Object} [menu] Configuration options to pass to the {@link OO.ui.MenuSelectWidget menu select widget}.
     * @cfg {jQuery} [$overlay] Render the menu into a separate layer. This configuration is useful in cases where
     *  the expanded menu is larger than its containing `<div>`. The specified overlay layer is usually on top of the
     *  containing `<div>` and has a larger area. By default, the menu uses relative positioning.
     *  See <https://www.mediawiki.org/wiki/OOUI/Concepts#Overlays>.
     */
    OO.ui.ComboBoxInputWidget = function OoUiComboBoxInputWidget( config ) {
    	// Configuration initialization
    	config = $.extend( {
    		autocomplete: false
    	}, config );

    	// ComboBoxInputWidget shouldn't support `multiline`
    	config.multiline = false;

    	// See InputWidget#reusePreInfuseDOM about `config.$input`
    	if ( config.$input ) {
    		config.$input.removeAttr( 'list' );
    	}

    	// Parent constructor
    	OO.ui.ComboBoxInputWidget.parent.call( this, config );

    	// Properties
    	this.$overlay = ( config.$overlay === true ? OO.ui.getDefaultOverlay() : config.$overlay ) || this.$element;
    	this.dropdownButton = new OO.ui.ButtonWidget( {
    		classes: [ 'oo-ui-comboBoxInputWidget-dropdownButton' ],
    		indicator: 'down',
    		disabled: this.disabled
    	} );
    	this.menu = new OO.ui.MenuSelectWidget( $.extend(
    		{
    			widget: this,
    			input: this,
    			$floatableContainer: this.$element,
    			disabled: this.isDisabled()
    		},
    		config.menu
    	) );

    	// Events
    	this.connect( this, {
    		change: 'onInputChange',
    		enter: 'onInputEnter'
    	} );
    	this.dropdownButton.connect( this, {
    		click: 'onDropdownButtonClick'
    	} );
    	this.menu.connect( this, {
    		choose: 'onMenuChoose',
    		add: 'onMenuItemsChange',
    		remove: 'onMenuItemsChange',
    		toggle: 'onMenuToggle'
    	} );

    	// Initialization
    	this.$input.attr( {
    		role: 'combobox',
    		'aria-owns': this.menu.getElementId(),
    		'aria-autocomplete': 'list'
    	} );
    	// Do not override options set via config.menu.items
    	if ( config.options !== undefined ) {
    		this.setOptions( config.options );
    	}
    	this.$field = $( '<div>' )
    		.addClass( 'oo-ui-comboBoxInputWidget-field' )
    		.append( this.$input, this.dropdownButton.$element );
    	this.$element
    		.addClass( 'oo-ui-comboBoxInputWidget' )
    		.append( this.$field );
    	this.$overlay.append( this.menu.$element );
    	this.onMenuItemsChange();
    };

    /* Setup */

    OO.inheritClass( OO.ui.ComboBoxInputWidget, OO.ui.TextInputWidget );

    /* Methods */

    /**
     * Get the combobox's menu.
     *
     * @return {OO.ui.MenuSelectWidget} Menu widget
     */
    OO.ui.ComboBoxInputWidget.prototype.getMenu = function () {
    	return this.menu;
    };

    /**
     * Get the combobox's text input widget.
     *
     * @return {OO.ui.TextInputWidget} Text input widget
     */
    OO.ui.ComboBoxInputWidget.prototype.getInput = function () {
    	return this;
    };

    /**
     * Handle input change events.
     *
     * @private
     * @param {string} value New value
     */
    OO.ui.ComboBoxInputWidget.prototype.onInputChange = function ( value ) {
    	var match = this.menu.findItemFromData( value );

    	this.menu.selectItem( match );
    	if ( this.menu.findHighlightedItem() ) {
    		this.menu.highlightItem( match );
    	}

    	if ( !this.isDisabled() ) {
    		this.menu.toggle( true );
    	}
    };

    /**
     * Handle input enter events.
     *
     * @private
     */
    OO.ui.ComboBoxInputWidget.prototype.onInputEnter = function () {
    	if ( !this.isDisabled() ) {
    		this.menu.toggle( false );
    	}
    };

    /**
     * Handle button click events.
     *
     * @private
     */
    OO.ui.ComboBoxInputWidget.prototype.onDropdownButtonClick = function () {
    	this.menu.toggle();
    	this.focus();
    };

    /**
     * Handle menu choose events.
     *
     * @private
     * @param {OO.ui.OptionWidget} item Chosen item
     */
    OO.ui.ComboBoxInputWidget.prototype.onMenuChoose = function ( item ) {
    	this.setValue( item.getData() );
    };

    /**
     * Handle menu item change events.
     *
     * @private
     */
    OO.ui.ComboBoxInputWidget.prototype.onMenuItemsChange = function () {
    	var match = this.menu.findItemFromData( this.getValue() );
    	this.menu.selectItem( match );
    	Iif ( this.menu.findHighlightedItem() ) {
    		this.menu.highlightItem( match );
    	}
    	this.$element.toggleClass( 'oo-ui-comboBoxInputWidget-empty', this.menu.isEmpty() );
    };

    /**
     * Handle menu toggle events.
     *
     * @private
     * @param {boolean} isVisible Open state of the menu
     */
    OO.ui.ComboBoxInputWidget.prototype.onMenuToggle = function ( isVisible ) {
    	this.$element.toggleClass( 'oo-ui-comboBoxInputWidget-open', isVisible );
    };

    /**
     * @inheritdoc
     */
    OO.ui.ComboBoxInputWidget.prototype.setDisabled = function ( disabled ) {
    	// Parent method
    	OO.ui.ComboBoxInputWidget.parent.prototype.setDisabled.call( this, disabled );

    	Iif ( this.dropdownButton ) {
    		this.dropdownButton.setDisabled( this.isDisabled() );
    	}
    	Iif ( this.menu ) {
    		this.menu.setDisabled( this.isDisabled() );
    	}

    	return this;
    };

    /**
     * Set the options available for this input.
     *
     * @param {Object[]} options Array of menu options in the format `{ data: …, label: … }`
     * @chainable
     */
    OO.ui.ComboBoxInputWidget.prototype.setOptions = function ( options ) {
    	this.getMenu()
    		.clearItems()
    		.addItems( options.map( function ( opt ) {
    			return new OO.ui.MenuOptionWidget( {
    				data: opt.data,
    				label: opt.label !== undefined ? opt.label : opt.data
    			} );
    		} ) );

    	return this;
    };