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Java example source code file (todoItem.jsx)

This example Java source code file (todoItem.jsx) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

enter_key, escape_key

The todoItem.jsx Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 *
 */

/*jshint quotmark: false */
/*jshint white: false */
/*jshint trailing: false */
/*jshint newcap: false */
/*global React */
var app = app || {};

(function () {
	'use strict';

	var ESCAPE_KEY = 27;
	var ENTER_KEY = 13;

	app.TodoItem = React.createClass({
		handleSubmit: function (event) {
			var val = this.state.editText.trim();
			if (val) {
				this.props.onSave(val);
				this.setState({editText: val});
			} else {
				this.props.onDestroy();
			}
		},

		handleEdit: function () {
			this.props.onEdit();
			this.setState({editText: this.props.todo.title});
		},

		handleKeyDown: function (event) {
			if (event.which === ESCAPE_KEY) {
				this.setState({editText: this.props.todo.title});
				this.props.onCancel(event);
			} else if (event.which === ENTER_KEY) {
				this.handleSubmit(event);
			}
		},

		handleChange: function (event) {
			this.setState({editText: event.target.value});
		},

		getInitialState: function () {
			return {editText: this.props.todo.title};
		},

		/**
		 * This is a completely optional performance enhancement that you can
		 * implement on any React component. If you were to delete this method
		 * the app would still work correctly (and still be very performant!), we
		 * just use it as an example of how little code it takes to get an order
		 * of magnitude performance improvement.
		 */
		shouldComponentUpdate: function (nextProps, nextState) {
			return (
				nextProps.todo !== this.props.todo ||
				nextProps.editing !== this.props.editing ||
				nextState.editText !== this.state.editText
			);
		},

		/**
		 * Safely manipulate the DOM after updating the state when invoking
		 * `this.props.onEdit()` in the `handleEdit` method above.
		 * For more info refer to notes at https://facebook.github.io/react/docs/component-api.html#setstate
		 * and https://facebook.github.io/react/docs/component-specs.html#updating-componentdidupdate
		 */
		componentDidUpdate: function (prevProps) {
			if (!prevProps.editing && this.props.editing) {
				var node = this.refs.editField.getDOMNode();
				node.focus();
				node.setSelectionRange(node.value.length, node.value.length);
			}
		},

		render: function () {
			return (
				<li className={React.addons.classSet({
					completed: this.props.todo.completed,
					editing: this.props.editing
				})}>
					<div className="view">
						<input
							className="toggle"
							type="checkbox"
							checked={this.props.todo.completed}
							onChange={this.props.onToggle}
						/>
						<label onDoubleClick={this.handleEdit}>
							{this.props.todo.title}
						</label>
						<button className="destroy" onClick={this.props.onDestroy} />
					</div>
					<input
						ref="editField"
						className="edit"
						value={this.state.editText}
						onBlur={this.handleSubmit}
						onChange={this.handleChange}
						onKeyDown={this.handleKeyDown}
					/>
				</li>
			);
		}
	});
})();

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