Beginning JavaScript with DOM Scripting and Ajax: Second by Russ Ferguson

By Russ Ferguson

Beginning JavaScript with DOM Scripting and Ajax is a vital source for contemporary JavaScript programming. This thoroughly up-to-date moment version covers every little thing you want to understand to get up-to-speed with JavaScript improvement and upload dynamic improvements to web content, correct from the fundamentals. in addition to concentrating on client-side JavaScript, additionally, you will the way to paintings with the Browser item version, the record item version (DOM), how you can use XML and JSON in addition to speak with carrier aspect scripts comparable to personal home page. learn how to:
  • Construct reliable JavaScript syntax following sleek coding practices
  • Use JavaScript to speak with the server and retrieve information
  • Dynamically manage markup, validate types and care for photographs
  • Debug purposes utilizing good points contained in the browser
JavaScript is among the most crucial applied sciences on the net. It presents the ability so as to add dynamic performance for your websites and serves because the spine of Ajax-style net improvement. Beginning JavaScript with DOM Scripting and Ajax will take you from being a JavaScript beginner to paintings freely with this significant expertise - start your JavaScript trip today! 

What you’ll learn

  • What services, variables, occasions and gadgets are and the way to exploit them.
  • How construct a website that may nonetheless paintings within the case that JavaScript is became off.
  • How to entry and replace a part of the web page utilizing code.
  • How to exploit JavaScript to speak with the server and retrieve facts.
  • How to take advantage of JavaScript to for shape validation and person suggestions.
  • How to take advantage of Third-Party Libraries like jQuery.

Who this e-book is for

Beginning JavaScript with DOM Scripting and Ajax is for the individual that has a great clutch of HTML and CSS yet desires to upload JavaScript to their skillset. with a purpose to research a few easy programming techniques, have adventure yet need assistance updating your talents, or you’re coming from one other language, Beginning JavaScript with DOM Scripting and Ajax can aid.

Table of Contents

  1. Getting began with JavaScript
  2. Data and judgements
  3. From DHTML to DOM Scripting
  4. HTML5 and JavaScript
  5. Presentation and behaviour (CSS and occasion dealing with)
  6. Common makes use of of JavaScript: snapshot and home windows
  7. JavaScript and consumer Integration: Navigation and kinds
  8. Back-End interplay with Ajax and Node.js
  9. Data Validation options
  10. Modern JavaScript Case examine: A Dynamic Gallery
  11. Using Third-Party JavaScript
  12. Appendix A: Debugging JavaScript

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Additional info for Beginning JavaScript with DOM Scripting and Ajax: Second Editon

Sample text

However, JavaScript can manipulate images in ways CSS cannot, and we will come back to this in Chapter 6. Every browser offers us the document it displays for manipulation, via something called the Document Object Model, or DOM for short. Older browsers supported their own DOMs, now called Legacy DOM or DOM Level 0. At the time of this writing, the latest version is DOM Level 3. all DOM was invented by Microsoft and supported by IE only. getElementById. Currently, all modern browsers understand the W3C DOM.

If the condition is true, another iteration of the loop will occur; otherwise, the loop ends. Use the following rules of thumb in deciding which looping structure to use: • Use a for loop if you want to repeat an action a set number of times. • Use a while loop when you want an action to be repeated until a condition is met. while loop if you want to guarantee that the action will be performed at least once. Summary We covered a lot of ground in this chapter: in fact, we discussed most of the essentials of the JavaScript language.

You can have as many if, else, and else ifs as you like, although they can make your code terribly complicated if you use too many. If there are a lot of possible conditions to check a value against in a piece of code, then the switch statement, which you’ll look at next, can be helpful. Testing Multiple Values: The switch Statement The switch statement allows you to switch between sections of code based on the value of a variable or expression. This is the outline of a switch statement: switch( expression ) { case someValue: // Code to execute if expression == someValue; break; // End execution case someOtherValue: // Code to execute if expression == someOtherValue; break; // End execution case yesAnotherValue: // Code to execute if expression == yetAnotherValue; break; // End execution default: // Code to execute if no values matched } 42 Chapter 2 ■ Data and Decisions JavaScript evaluates switch(expression) and then compares it to each case.

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