Eloquent JavaScript. 3rd edition The third edition of Eloquent JavaScript was made possible by financial · backers. JavaScript easier for beginners. Trademarks: Wiley, For Dummies, the Dummies Man logo, JavaScript is a registered trademark of Oracle, Inc. All other trademarks. Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming.

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All rights reserved. No part of this book shall be reproduced, stored in a retrieval system, or transmitted by any means, electronic, mechanical, photocopying. Objects in JavaScript. ChapTEr 9. The Browser Object Model. ChapTEr 10 an introduction to JavaScript libraries and frameworks. Working with Timers in JavaScript. Often you'll run into a situation where you need to trigger an event dynamically in In Javascript.

Let's try out some simple examples. Enter the following line of code into the Console Window.


You can place it anywhere on the line as long as nothing is selected. Either of the two following actions will cause Acrobat to run the code. If your keyboard has a number pad, you can use the Enter key on the number pad without pressing the Control Command on Mac key. Macintosh's have the additional issue of keyboard configuration mentioned earlier.

Introduction to Acrobat JavaScript

Acrobat displays the result of the execution on the next available line, also shown in Figure 4. Sometimes the result of an operation is not as clean or obvious as a number. Let's try something that doesn't have such a well-defined result.

Instead, as shown in Figure 5, it displays the word "Infinity. It is much easier to find this kind of issue by executing individual lines in the Console Window where you can see the results immediately, than it is to debug it from a field-calculation script. The next line of example code is something that might be used in a real script.

The Modern JavaScript Tutorial

It assigns a simple addition to a variable named 'sum'. The calculation is executed and applied to the declared variable, sum. However, the first and primary operation on the line is the variable declaration, so this is the operation that returns a value to the Console Window.

Unfortunately, variable declarations do not return a value. To overcome this small issue, the Console widow displays "undefined. Anything that doesn't exist to the JavaScript environment is "undefined.

This action executes just the selected text. So far we've talked about executing code in the Console Window for testing and debugging, but there is no reason to restrict our usage to this limited theme. Immediate Mode means that anything entered into this window is executed directly by the JavaScript engine.

We can use it anytime we want to execute code for any purpose. Two uses for the Console Window besides code testing that immediately come to mind are automation and analysis.

There are several functions in Acrobat for manipulating and for acquiring information from PDFs and Acrobat. For operations with a user interface button or menu item, the main advantage of using JavaScript is greater flexibility, since JavaScript functions typically provide more options than the user interface equivalent.

For example, suppose you wanted to know the exact border color of a text field so you could use the same color in another location. Assuming the current document has a field with the correct name on it, the following code displays the raw color value in the Console Window: this. Remember, Acrobat attempts to convert all results into text. Arrays are converted to text by converting each individual array element into a text string, so the result would look something like the following line when it is displayed in the Console Window.

We've just found out something that would have taken us just a little more effort to find out using the Acrobat property dialogs, and the information is in a very usable format.

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We can easily copy and paste this information to accomplish some other purpose, for example applying the color to another field with this line of code: this. Suppose a document needs to be checked for branding purposes, i.

It has to be done all at once. Notice that in the loop there is a function called console. It's in the fourth line.

This function writes text to the Console Window and it will be discussed in the next section. Here's an example of a function that does not have an easy equivalent on the regular Acrobat menus and toolbars.

Form submission: Document and resource loading. DOMContentLoaded, load, beforeunload, unload. Resource loading: List of extra topics that are not covered by first two parts of tutorial. There is no clear hierarchy here, you can access articles in the order you want. Frames and windows. Popups and window methods. Cross-window communication.

The clickjacking attack. Binary data, files. ArrayBuffer, binary arrays.

The website you were trying to reach is temporarily unavailable.

TextDecoder and TextEncoder. Network requests.

Download progress. Cross-Origin Requests.

Storing data in the browser. LocalStorage, sessionStorage. JavaScript animations. Web components.

From the orbital height. Template element. Shadow DOM slots, composition. Shadow DOM styling. Shadow DOM and events.

Regular expressions. Patterns and flags. Methods of RegExp and String. Character classes. Escaping, special characters. Sets and ranges [ Greedy and lazy quantifiers. Backreferences in pattern: Alternation OR.

Multiline mode, flag "m". Lookahead and lookbehind. Infinite backtracking problem. Sticky flag "y", searching at position. Mutation observer. Comments read this before commenting… You're welcome to post additions, questions to the articles and answers to them. Earlier I have shared some of the free JavaScript tutorials and in this article, I am going to share 5 good books to learn JavaScript which are free to read online or allow you to download PDF for offline reading.

JavaScript is probably another language I recommend someone who knows Java, Why? There is almost no website which is not using JavaScript in one or other format. Some use JavaScript for client-side scripting and animation, while other use JavaScript on the server side with libraries like node. If you are web developer it's very important for you to know in and out of JavaScript. Since Java is also ubiquitous and many Java web application uses JavaScript and jQuery for client-side scripting and validation.

I highly recommend Java programmers to learn JavaScript , it's only going to help you to get better. It will provide more job opportunity and help you to become full stack developer, which most of the startup and small company look after.

If you want to further improve your chance to get a web development job or want to do develop modern websites, I also suggest you take a look at popular JavaScript frameworks like Angular and React JS , which are now ruling the world. Most of the front-end application we are developing right now is either using Angular or React. There is no better time to learn these JavaScript libraries.Modifying the document. Its sole purpose in life is to allow the developer to write scripts programming code that automates tasks that would otherwise be time consuming and mind numbing Using the Console to display status and error messages Besides testing code, the Console Window has one other important role in debugging JavaScript.

Form submission: Rest parameters and spread operator. It will provide more job opportunity and help you to become full stack developer, which most of the startup and small company look after.