Writing a JavaScript User-Defined Function A function is JavaScript code written to perform certain...
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Transcript of Writing a JavaScript User-Defined Function A function is JavaScript code written to perform certain...
Writing a JavaScript User-Defined Function
A function is JavaScript code written to perform certain tasks repeatedly
Built-in functions
Writing a JavaScript User-Defined Function
User-defined functions Written by the Web developer
Functions can have data passed to it To call a function means to have
JavaScript execute the function
Entering the chngSite() User-Defined Function in the HEAD Section
Click the blank line (line 4) between the end </TITLE> tag and the end </HEAD> tag
Type <SCRIPT LANGUAGE=“JAVASCRIPT””>and then press the ENTER key. Type
<!—Hide from old browsers and thenpress the ENTER key
Entering the chngSite() User-Defined Function in the HEAD Section
Press the SPACEBAR four times. Type function chngSite() { and then press the ENTER key. Press the SPACEBAR eight times. Type alert(“You are about to be transported to the new site location!”) and then press the ENTER key. Press the SPACEBAR eight times. Type location = “http://www.scsite.com/” and then press the ENTER key. Press the SPACEBAR four times. Type } and then press the ENTER key. Type //-> and then press the ENTER key. Type </SCRIPT> and then press the ENTER key
Testing the Web Page
Click the Fun with Phonics button on the taskbar
Click the Refresh button on the browser toolbar
If you are connected to the Internet, click the OK button when the dialog box displays with the alert message
Click the Back button on the browser toolbar to return to the Fun with Phonics Web page
Printing the HTML File Using Notepad
If necessary, click the Notepad button on the taskbar. Click File on the menu bar and then point to Print
Closing Notepad and Your Browser
Click the Close button on the browser title bar
Click the Close button on the Notepad window title bar
Summary
Discuss how to integrate JavaScript with HTML Insert <SCRIPT> tags on a Web page Write start and end <SCRIPT> tags Define and use flickering to draw attention Describe the background color property of the
document object
Summary
Set the background color of a Web page using JavaScript
Save the HTML file Test the Web page Discuss JavaScript variables Extract the system date Use several variables to construct a message
Summary
Describe the write() method of the document object Write a user-defined function that displays a message
and links visitors to a new Web site Describe how the setTimeout() method works Use the lastModified property to display the last
modified document date Print an HTML Notepad file