A wrapper class for dialogs created with the Script UI Dialog Builder by Joonas - https://scriptui.joonas.me/

DialogWrapper.js

/**
 * @author Scott Lewis <scott@atomiclotus.net>
 * @copyright 2020 Scott Lewis
 * @version 1.0.0
 * @url http://github.com/iconifyit
 * @url https://atomiclotus.net
 *
 * ABOUT:
 *
 * This JS class is a wrapper for dialogs created with the Script UI Dialog Builder by Joonas Pääkkö.
 * The wrapper dynamically creates getters and setters as well as provides an easy interface for
 * retrieving field values, attaching event handlers to buttons, performing form validation, etc.
 * This allows you to simply copy & paste the original dialog into your script/extension and not have
 * to modify it at all to work with your code. Additionally, if you need to make changes to the dialog,
 * you do not need to change any of your code other than custom handlers and field validators. *
 *
 * LICENSE:
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the “Software”), to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
 * CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Usage:
 *
 *     The basic idea is to use the DialogWrapper like a View. You do not need to interact directly with
 *     the Dialog object itself, you can use the intuitive interfaces created by the wrapper to get, set,
 *     and validate values, as well as respond to user actions.
 *
 *     var wrapper = new DialogWrapper(
 *         this,
 *         new Dialog(),
 *         ['name', 'email', 'url']
 *         ['cancel', 'ok'],
 *         {
 *             name  : 'Scott',
 *             email : 'scott@atomiclotus.net',
 *             url   : 'https://atomiclotus.net'
 *         }
 *     );
 *
 * Using getters and setters:
 *
 *     NOTE: You do not need to include a class reference. The getters and setters are added
 *     to the calling scope, typically Window so that calling `getName()` is the same as `window.getName()`
 *
 *     getName()  // -> Scott
 *     getEmail() // -> scott@atomiclotus.net
 *     getUrl()   // -> https://atomiclotus.net
 *
 * Or update dialog field values:
 *
 *     setName('Scott Lewis');
 *     setEmail('scott@vectoricons.net');
 *     setUrl('https://vectoricons.net');
 *
 * Validating the form:
 *
 *     wrapper.validateForm({
 *        name  : function(name) { return name.tirm() !== '' },
 *        email : function(email) { // email validation code },
 *        url   : function(url) { // url validation code }
 *     });
 *
 * Set the default and cancel buttons:
 *
 *     wrapper.setDefaultElement('Ok');
 *     wrapper.setCancelElement('cancel');
 *
 * Set a callback handler:
 *
 *     wrapper.setHandler('ok', 'onclick', function() {
 *         // Handle the click event.
 *     });
 *
 *     OR:
 *
 *     wrapper.setHandler('name', 'onchange', function() {
 *        wrapper.updateFormState();
 *     });
 *
 * Get the form's values:
 *
 *     var values = wrapper.getFormValues();
 *
 * Show & hide the dialog:
 *
 *     wrapper.show();
 *     wrapper.close();
 *
 * @see https://scriptui.joonas.me/
 */
(function(global) {

    /**
     * Get a value from an object or array.
     * @param {object|array}    subject     The object or array to search
     * @param {string}          key         The object property to find
     * @param {*}               _default    The default value to return if property is not found
     * @returns {*}                         The found or default value
     */
    function get( subject, key, _default ) {
        var value = _default;
        if (typeof(subject[key]) !== 'undefined') {
            value = subject[key];
        }
        return value;
    }

    /**
     * Creates a new DialogWrapper class.
     * @param global
     * @param Dialog
     * @param fields
     * @param buttons
     * @param data
     * @constructor
     */
    var DialogWrapper = function(global, Dialog, fields, buttons, data) {

        var module = this;

        try {

            /**
             * @type {{}}
             */
            this.getters = {};

            /**
             * @type {{}}
             */
            this.setters = [];

            /**
             * @type {Window | Window | IconMetaDialog}
             */
            this.dialog  = Dialog;

            /**
             * @type {*|*[]}
             */
            this.fields  = fields || [];

            /**
             * @type {*|*[]}
             */
            this.buttons = buttons || [];

            /**
             * @type {*|{}}
             */
            this.meta    = data || {};

            /**
             * @type {string}
             */
            this.cancelElementName = 'cancel';

            /**
             * @type {string}
             */
            this.defaultElemenName = 'save';

            /**
             * Initialize the wrapper class.
             */
            this._init();

        }
        catch(e) { throw e; }
    }

    /**
     * Initializes the class.
     * @private
     */
    DialogWrapper.prototype._init = function() {

        var module = this;

        /*
         * Test global field values.
         */
        try {
            this.fields.forEach(function(fieldName) {
                module.set(fieldName, get(data, fieldName, ''));
            });
        }
        catch(e) { throw e; }

        /*
         * Create Getters and Setters
         */
        for (var f in this.fields) {

            var func,
                getter = this.makeGetterName(f),
                setter = this.makeSetterName(f);

            /*
             * Adds getter for each field to the calling scope (typically Window)
             * Example : getName() // --> returns value of 'name' field of the dialog.
             */

            func = function() {
                return module.get(f);
            }

            module.getters[getter] = global[getter] = func;

            /*
             * Adds setter for each field to the calling scope (typically Window)
             * Example : setName(value) // --> sets the 'name' field on the dialog.
             */

            func = function(value) {
                module.set(f, value);
                return module.get(f);
            }

            module.setters[setter] = global[setter] = func;
        }
    }

    /**
     * Show the dialog.
     */
    DialogWrapper.prototype.show = function() {
        this.dialog.show();
    }

    /**
     * Close the dialog.
     */
    DialogWrapper.prototype.close = function() {
        this.dialog.close();
    }

    /**
     * Sets the dialog's default button.
     * @param buttonName
     */
    DialogWrapper.prototype.setDefaultElement = function(buttonName) {
        this.defaultElemenName = buttonName;
        this.dialog.defaultElement = this.findElement(buttonName);
    }

    /**
     * Sets the dialog's cancel button.
     * @param buttonName
     */
    DialogWrapper.prototype.setCancelElement = function(buttonName) {
        this.cancelElementName = buttonName;
        this.dialog.cancelElement = this.findElement(buttonName);
    }

    /**
     * Update the form state based on form validation.
     */
    DialogWrapper.prototype.updateFormState = function() {
        this.dialog.defaultElement.enabled = this.validateForm();
    }

    /**
     * Make sure required fields have values.
     * @returns {boolean}
     *
     * Usage:
     *
     *      Validations are necessarily custom. The validations variable is an
     *      object with field names and a function that performs the validation.
     *      So, for instance, if you have a `name` field that is required, you could
     *      just pass:
     *
     *      validations = {
     *          'name' : function(name) {
     *              return name.trim() !== '';
     *          }
     *      }
     *
     *      DialogWrapper.validateForm(validations)
     */
    DialogWrapper.prototype.validateForm = function(validations) {

        var module = this,
            validator,
            value;

        for (var fieldName in validations) {
            value = module.get(fieldName);
            validator = function(){}
            if (validations[fieldName] instanceof Function) {
                validator = validations[fieldName];
            }
            if (! validator.call(this, value)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Get the form values.
     * @returns {{setName: string, folderPath: *, authorName: string, imagesPath: string, fileType: string}}
     */
    DialogWrapper.prototype.getFormValues = function() {
        var formValues = {};
        this.fields.forEach(function(fieldName) {
            formValues[fieldName] = this.get(fieldName, null);
        })
        return formValues;
    }

    /**
     * Get a field value by field name.
     * @param key
     * @param fallback
     * @returns {*}
     */
    DialogWrapper.prototype.get = function(key, fallback) {
        try {
            var field = this.findElement(key);
            if (! $is.undefined()) {
                if (! $is.undefined(field.text)) {
                    return field.text;
                }
                else if (! $is.undefined(field.value)) {
                    return field.value;
                }
            }
            return fallback;
        }
        catch(e) { throw e; }
    }

    /**
     * Set a field value by field name.
     * @param key
     * @param fallback
     * @returns {*}
     */
    DialogWrapper.prototype.set = function(key, value) {
        try {
            var field = this.findElement(key);
            if (! $is.undefined(field)) {
                if (! $is.undefined(field.text)) {
                    field.text = value;
                }
                else if (! $is.undefined(field.value)) {
                    field.value = value;
                }
            }
            return field;
        }
        catch(e) { throw e; }
    }

    /**
     * Create getter from field names.
     * @param fieldName
     * @returns {*}
     */
    DialogWrapper.prototype.makeGetterName = function(fieldName) {
        var f = fieldName;
        return fieldName.replace(
            /\w\S*/g,
            'get' + f.charAt(0).toUpperCase() + f.substr(1)
        );
    }

    /**
     * Create setter from field names.
     * @param fieldName
     * @returns {*}
     */
    DialogWrapper.prototype.makeSetterName = function(fieldName) {
        var f = fieldName;
        return fieldName.replace(
            /\w\S*/g,
            'set' + f.charAt(0).toUpperCase() + f.substr(1)
        );
    }

    /**
     * Wrapper for Dialog.findElement
     * @param entityName
     * @returns {*}
     */
    DialogWrapper.prototype.findElement = function(entityName) {
        return this.dialog.findElement(entityName);
    }

    /**
     * Sets event handler on dialog element.
     * @param entityName
     * @param eventName
     * @param handler
     */
    DialogWrapper.prototype.setHandler = function(entityName, eventName, handler) {
        var entity = this.findElement(entityName);
        if (typeof entity !== 'undefined') {
            entity[eventName] = handler;
        }
    }

    global.DialogWrapper = DialogWrapper;
})(this);