Ajax: A Beginner s Guide in Java

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Ajax: A Beginner s Guide
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if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } function getData(dataSource, divID) { if(XMLHttpRequestObject) { var obj = documentgetElementById(divID); XMLHttpRequestObjectopen("GET", dataSource); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { objinnerHTML = XMLHttpRequestObjectresponseText; } } XMLHttpRequestObjectsend(null); } } </script> </head> <body> <H1>An Ajax example</H1> <form> <input type = "button" value = "Fetch the message" onclick = "getData('datatxt', 'targetDiv')"> </form> <div id="targetDiv"> <p>The fetched message will appear here</p> </div> </body> </html>
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The code above that s in bold is JavaScript, the heart of Ajax To write Ajax applications, you need to know JavaScript and that is what this chapter is all about
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Getting to Know JavaScript
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Introducing JavaScript
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JavaScript was first created and introduced to the world in 1995, by a developer named Brendan Eich at Netscape Communications Corporation He named his programming language LiveScript, but the powers that were at Netscape renamed it JavaScript The Java programming language was wildly popular at that time, and even though JavaScript is not related to Java, the name stuck (In fact, the creators of the Java language, Sun Microsystems, had trademarked the name Java, and so the name JavaScript was made a trademark of Sun Microsystems) JavaScript was a hit It was fun, it was powerful in a word, it was cool Programmers loved the things you could do with it in web pages You could alter the text in web pages, respond to the mouse, change color schemes, and more Web page writers ate this up And JavaScript inevitably caught the attention of Microsoft At the time, the two dominant browsers were Netscape Navigator and Microsoft Internet Explorer Microsoft didn t want to be left behind in the JavaScript wars, but it didn t want to simply license JavaScript from Netscape so it created its own version, JScript JScript first appeared in 1996, in Internet Explorer 30, and over the years, JavaScript and JScript have become increasingly similar However, there are a few differences that we ll come across in our guided tour of Ajax (for example, the way you create XMLHttpRequest objects, the fundamental programming construct of Ajax, differs in JavaScript and JScript), but it won t be anything we can t handle As an interesting historical note, both Netscape and Microsoft turned to a third party, the standards body European Computer Manufacturers Association (Ecma International, www ecma-internationalorg) to standardize JavaScript so that it could be used in both browsers What happened in fact was that a third language, ECMAScript, was born And most browsers versions of JavaScript are coming in line with ECMAScript these days
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Are there any online references for JavaScript, JScript, and ECMAScript Yes indeed You can find a reference for JavaScript at http://developermozillaorg/en/docs/ Core_JavaScript_15_Reference, and a reference for JScript is at http://msdn2microsoft com/en-us/library/hbxc2t98(vs71)aspx There is also a great deal of information about ECMAScript available online:
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The ECMAScript Language Specification, 3rd edition, is at wwwecma-internationalorg/publications/standards/Ecma-262htm The ECMAScript Components Specification is at wwwecma-internationalorg/publications/standards/Ecma-290htm The ECMAScript 3rd Edition Compact Profile Specification is at wwwecma-internationalorg/publications/standards/Ecma-327htm
Now let s start digging into JavaScript and seeing it work
Ajax: A Beginner s Guide
Getting Started with JavaScript
We re going to see JavaScript programming at once with a new example, javascripthtml This example appears in Figure 2-3 In this first example, we re using JavaScript code to write the header Welcome to JavaScript! that appears in Figure 2-3; doing so will give us our start with JavaScript You embed your JavaScript in a web page Say, for example, that javascripthtml started off like this just pure HTML:
<html> <head> <title>This is a first JavaScript example</title> </head> <body> This is a first JavaScript example </body> </html>
Now we re going to start adding JavaScript You place your JavaScript code into an HTML <script> element, which goes inside the page s <head> element, like this:
<html> <head> <title>This is a first JavaScript example</title> <script language="javascript"> </script> </head> <body> This is a first JavaScript example </body> </html>
Figure 2-3
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