112 lines
3.1 KiB
JavaScript
112 lines
3.1 KiB
JavaScript
/**
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* Field visibility event handler
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework
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*
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* Liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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const Class = require( 'easejs' ).Class;
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const EventHandler = require( './EventHandler' );
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const UnknownEventError = require( './UnknownEventError' );
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/**
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* Shows/hides fields according to event id
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*
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* @todo use something more appropriate than Ui
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* @todo should not be concerned with data validators
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*/
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module.exports = Class( 'FieldVisibilityEventHandler' )
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.implement( EventHandler )
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.extend(
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{
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/**
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* Client UI
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* @type {Ui}
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*/
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'private _ui': null,
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/**
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* Field data validator
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* @type {DataValidator}
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*/
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'private _data_validator': null,
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/**
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* Initialize with Client UI
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*
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* @param {Ui} stepui Client UI
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* @param {DataValidator} data_validator field data validator
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*/
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__construct( stepui, data_validator )
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{
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this._ui = stepui;
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this._data_validator = data_validator;
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},
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/**
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* Show/hide specified fields
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*
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* If a given field is not known then it will be silently ignored; the
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* callback `callback` will still be invoked.
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*
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* This relies on a poorly designed API that should change in the future.
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*
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* @param {string} event_id event id
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* @param {function(*,Object)} callback continuation to invoke on completion
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*
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* @param {elementName:string, indexes:Array.<number>} data
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*
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* @return {EventHandler} self
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*/
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'public handle'( event_id, callback, { elementName: field_name, indexes } )
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{
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// TODO: Law of Demeter!
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const group = this._ui.getCurrentStep()
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.getElementGroup( field_name );
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// we probably should care, but we don't right now
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if ( !group )
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{
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callback();
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return;
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}
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const action = ( () =>
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{
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switch ( event_id )
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{
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case 'show':
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return group.showField.bind( group );
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case 'hide':
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return group.hideField.bind( group );
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default:
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throw UnknownEventError( `Unknown visibility event: ${event_id}` );
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}
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} )();
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this._data_validator.clearFailures( { [field_name]: indexes } );
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indexes.forEach( field_i => action( field_name, field_i ) );
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callback();
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}
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} );
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