Place tags at the bottom of HTML page. But some JavaScript frameworks want to live in the se
May 18, 2010 - aka ECMAScript 3, circa 1999. JavaScript for PHP Developers - Ed Finkler - tek-X - May 18, 2010. Baseline
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Adobe Flex Framework An XML- and ActionScript-based framework designed to make de-veloping Flash-based Rich Internet Applications (RIAs) easy. Adobe Flex Builder
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2 -File Names 1 Java Code Conventions 1 - Introduction 1.1 Why Have Code Conventions Code conventions are important to programmers for a number of reasons:
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JavaScript for Java Developers
Yakov Fain
Farata Systems, USA
@yfain
Simple things that Java developers take for granted (a VM version or names of the class methods) aren’t available in a tribe called JavaScript Developers.
About Myself ■ Work for IT consultancy Farata Systems
■ Java Champion
■ Authored several technical books.
■ Working on “Enterprise Web Development: From Desktop to Mobile”, for O’Reilly. Read its current draft at EnterpriseWebBook.com
■ Blogging at: yakovfain.com and blog.faratasystems.com
3
Why 17 year old JavaScript is Hot Again?
Hope to Write Once, Run Anywhere.
4
Where to Run JavaScript? - In Your Web browser
- Google’s V8 JavaScript Engine exists on the server (Node.js runs there)
- Java includes Java Scripting API and the utility jrunscript
- JDK SE 8 will include JavaScript engine Nashorn.
5
JavaScript arrives to the place of execution as text.
There’s no compiler helping developers with syntax errors.
Users may have different runtime environment.
Imagine writing a Java program that must work in any version of JVM.
Selected IDEs Supporting JavaScript § Eclipse for Java EE Developers
with VJET Plugin
§ WebStorm and IntelliJ IDEA
§ Aptana Studio - Eclipse-based IDE
§ NetBeans - Project Easel
§ DreamWeaver
§ Visual Studio
Debugging JavaScript § Firefox:
add-on FireBug
§ Chrome: Developer Tools
§ Internet Explorer: F12 Developer Tools
§ Safari: the menu Develop
§ Opera Dragonfly
§ NetBeans 7.3 (see Project Easel)
JavaScript in the Web Page Place
Using Styles HTML use CSS class selectors, and you can control styles programmatically in JavaScript.
The styles can be either embedded in your HTML page in using tag or loaded from the external .css file using the tag:
Changing Styles in JavaScript To find elements that use specified class selectors use getElementsByClassName(), which returns a NodeList of matching elements.
document.getElementsByClassName("niceStyle");
To change the selector on the HTML element, use the attribute className:
Web Browser’s Events Browser dispatches events: load, mousemove, click, keydown, etc. An event handler (a.k.a. listener) is a funcLon you want to be called as a response to this event. //Declaring an event handler in HTML Click Me //Declaring an event handler in JavaScript
Removing an event listener: myButton.removeEventListener(“click”, myHandler, false);
bubble
JavaScript target = Swing source Capturing phase is when event object travels to the target from the top most container. Bubbling phase is when event object from target up through all enclosing containers. Registering an event listener in JavaScript
