qr code generator java download <body> Hi, there is a sale today! 20% off everything! </body> in Java

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<body> Hi, there is a sale today! 20% off everything! </body>
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This ensures that all users can access the message with or without JavaScript
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One technique for ensuring wide accessibility that has become widely used is one that provides the content for the viewer first, then uses JavaScript to make the experience more appealing for those that can run it This is typically called progressive enhancement and allows all viewers to use the site while providing a richer experience for those with modern browsers This is what you did (on a small scale) with the script in the previous section By offering the sale message when the link is clicked, you made it accessible to all viewers However, those with JavaScript were able to view the alert without leaving the page and needing to go back, enhancing their experience somewhat This process can be simple, as in the previous example, or it can be as complex as adding a lot of JavaScript code to work with various browsers and/or adding server-side scripting to
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aid those without JavaScript You can learn more about progressive enhancement at http:// developeryahoocom/yui/articles/gbs/#progressive-enhancement Yahoo! has a very detailed and organized system of progressive enhancement that allows the JavaScript code to work with as many browsers as possible, but also provides server-side scripts or HTML content for those without JavaScript
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For information on accessibility with JavaScript and forms, refer to 14, which discusses this topic and the use of forms with JavaScript
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pr16_1html saleshtml prjs16_1js
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Make This Code Accessible
To practice making JavaScript more accessible, you will take an HTML page and work with it to separate the JavaScript and HTML code as much as possible You ll also use code that ensures that those without JavaScript can also obtain any additional content
Step by Step
1 Create an HTML document named pr16_1html and use the following HTML code for the
body section:
<body> <script type="text/javascript"> function new_win() { windowopen('saleshtml','newwin''width=300,height=200'); } </script> <div> <h1>Sales:</h1> </div> <div> <a href="#" onclick="new_win(); return false;">Click for Sale Information</a> </div> </body> 2 Create an HTML document named saleshtml and use the following HTML code for the
body section:
<body> <h1>Sales:</h1> Clothes: 25% off<br /> Electronics: 10% off<br /> Appliances: 15% off (with coupon) </body>
(continued)
JavaScript: A Beginner s Guide
3 Make the code accessible and usable for those without JavaScript by making any necessary
adjustments and moving as much JavaScript code as possible to a JavaScript file named prjs16_1js
4 For an added bonus, try removing the new window from this entirely and placing the sales
information in the division that simply has the text Sales: in it for those with JavaScript
5 Save the HTML and JavaScript files and open the HTML file in your browser The content
should now be accessible in any browser with which you choose to open the page
Try This Summary
In this project, you used your knowledge of accessibility to make a document and script more accessible for the viewer
Using Cookies
A cookie is a small text file that is stored on the end user s computer It can be referenced any time the viewer returns to your site, provided the cookie hasn t been deleted or expired Of course, if the viewer doesn t accept cookies, then a cookie won t be able to be set or referenced later Keep the following points in mind when using cookies:
Cookies must be 4KB (4000 characters) each or less A browser can accept up to only 20 cookies from a single domain If a number of viewers don t accept cookies, this eliminates any advantages of your cookie(s) to those viewers
Netscape invented cookies to help users browse your site more effectively For instance, if you use a script on your main page that sends one or more alerts while the page is loading, you won t want that to happen every time the viewer goes to another page on your site and then returns to the home page It would likely be so aggravating that you wouldn t have a visitor after it happened a few times The alerts pop up each time the page loads, because HTTP lacks state persistence Cookies fill that gap because they allow the browser to remember that the viewer has seen the pop-up alert before and thus not display it on subsequent page visits With cookies, you can fix problems like these for any viewers who have cookies enabled
Setting a Cookie
Setting a basic cookie is as easy as giving a value to the cookie property of the document object The only restriction is that you can t have spaces, commas, or semicolons inside the string
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