FUNCTIONS in .NET framework

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FUNCTIONS
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JavaScript functions are packages of code that are launched when called by the Web page. The advantage of functions is that you can use them to package code and make changes to add new content. The built-in write() function only requires that you enter some text for it print to the document (Web page). You don t have to rely on built-in functions but can create your own. For example, the following is an external JavaScript program with a simple function that opens an alert() function. (A user function using a built-in function.) Save the following JavaScript program as nameMe.js:
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// JavaScript Document var name= Little Willie Hacker ; function getName(someName) { alert(someName); } getName(name)
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All functions are followed by parentheses. If required, the developer can put a parameter in the parentheses. In this case, the parameter is called someName. When the function is called, the developer places a name, a number, or anything else desired in the space where someName is. In this case, a variable labeled name is assigned the value Little Willie Hacker. At the bottom of the program, the line, getName(name) calls the function, placing the variable into the parameter. The function passes the value of the variable to the alert() function within the getName() function, so you can expect to see an alert box on the screen when the program launches. The following HTML5 (JSfunction.html in this chapter s folder at www.wiley.com/go/smashinghtml5) calls the JavaScript that calls the function.
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<!DOCTYPE HTML> <html> <head> <script src= nameMe.js ></script> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>External Function</title> </head> <body> </body> </html>
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That JavaScript program launched as soon as the page loads. A more important use of JavaScript functions lies in its ability to wait for the JavaScript until it needs it. The next section shows how.
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PART IV: DYNAMIC HTML5 TAGS PLUS A LITTLE JAVASCRIPT AND PHP EVENT HANDLERS
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The real power of JavaScript with HTML5 can be better seen when the program waits until the user does something to launch a script. For example, if the user clicks something, you can launch any JavaScript program you want. You use an HTML5 event handler. The page detects some kind of action (an event) and has a built-in function that recognizes the event. HTML5 recognizes a lot of events. Some of the events occur automatically such as when the page loads. Other events occur when users do something with the mouse or keyboard. The elements in Table 12.1 shows a sample of some of the different events handlers.
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Table 12.1
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onchange
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A Sample of HTML5 Event Handlers
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onclick ondragleave onkeypress onmouseover onplaying ondbleclick ondragover onkeyup onmouseup onprogress ondrag ondragstart onmousedown onmousewheel onloadstart ondragend ondrop onmousemove onpause onload
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ondragenter onkeydown onmouseout onplay
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The general format of all events linked to elements is: 236
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<element onEvent = javascriptFunction() >
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For example,
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<body onLoad = announceSomething() >
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uses the body element with the onLoad event handler to fire a JavaScript function named announceSomething().
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Detecting a variety of events
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To see how event handlers work with JavaScript, the following program (ClickDetect. html in this chapter s folder at www.wiley.com/go/smashinghtml5) has three different event handlers and three different JavaScript functions that are launched by the events. The first one sends out an alert when the page loads, the second fires when the top link is clicked, and the third launches an alert when the second link is double-clicked.
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<!DOCTYPE HTML> <html> <head> <style type= text/css > h1, h2 { font-family:Tahoma, Geneva, sans-serif; }
CHAPTER 12: ADDING JUST ENOUGH JAVASCRIPT
a { text-decoration:none; color:#060; } </style> <script type= text/javascript > function detectLoaded() { alert( Page is loaded. ); } function detectClick() { alert( You clicked a link. ); } function detectDoubleClick() { alert( You double-clicked another link. ); } </script> <meta http-equiv= Content-Type content= text/html; charset=UTF-8 > <title>Event Handler</title> </head> <body onLoad= detectLoaded() > <hgroup> <h1> <a href= # onClick= detectClick() >Click This</a></h1> <h2> <a href= # onDblClick= detectDoubleClick() >Double-Click This</a> </h2> </hgroup> </body> </html>
The JavaScript functions can be whatever you want them to be, which enables you to interact far more with the users. You can provide instructions, options, cautions, or whatever you want.