Part IV: Scripting and (X)HTML in Java

Paint PDF417 in Java Part IV: Scripting and (X)HTML

Part IV: Scripting and (X)HTML

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Working with Cookies

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Every time we start talking about cookies, we re tempted to grab a glass of milk and get ready for dipping Then we remind ourselves that Web cookies, as useful as they can be, are actually tasteless (We imagine they d taste more like chicken than cookies made from the Toll House recipe) Although they may not be tasty, you may find cookies helpful as you create your Web site A cookie allows you to store information on visitors computers that you can revisit later Cookies offer a powerful way to maintain state within Web pages The code in Listing 16-3 reads and writes two cookies as a visitor loads the page: pageHit contains a count of the number of times the visitor has loaded the page pageVisit contains the last date and time the visitor visited Figure 16-7 shows how the page appears on the initial visit, and Figure 16-8 shows how it looks on subsequent visits

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Figure 16-7: This cookie knows you ve never been to this page before

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Figure 16-8: These cookies know not only that you ve been here before, but when

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16: Fun with Client-Side Scripts

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Listing 16-3: Cookie-handling Script

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<!DOCTYPE html PUBLIC -//W3C//DTD XHTML 10 Transitional//EN http://wwww3org/TR/xhtml1/DTD/xhtml1-transitionaldtd > <html xmlns= http://wwww3org/1999/xhtml > <head> <title>Cookie Demo</title> <meta http-equiv= Content-Type content= text/html; charset=ISO-8859-1 /> <script type= text/javascript language= javascript > <!-now = new Date expireDate = new Date expireDatesetMonth(expireDategetMonth()+6) hitCt = parseInt(cookieVal( pageHit )) hitCt++ lastVisit = cookieVal( pageVisit ) if (lastVisit == 0) { lastVisit = } documentcookie = pageHit= +hitCt+ ;expires= + expireDatetoGMTString() documentcookie = pageVisit= +now+ ;expires= + expireDatetoGMTString() function cookieVal(cookieName) { thisCookie = documentcookiesplit( ; ) for (i=0; i<thisCookielength; i++) { if (cookieName == thisCookie[i]split( = )[0]) { return thisCookie[i]split( = )[1] } } return 0 } --> </script> </head> <body> <h2> <script type= text/javascript language= javascript > <!-documentwrite( You have visited this page + hitCt + times ) if (lastVisit != ) { documentwrite( <br />Your last visit was + lastVisit) } --> </script> </h2> </body> </html>

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Part IV: Scripting and (X)HTML

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Unlike preceding examples, Listing 16-3 has a <script> section in both the head and the body: Cookies are read and written in the header script when the page loads The body script dynamically writes out the contents of the page itself Follow these steps to add the cookie-handling script to your page: 1 Copy both <script> sections and put them into the appropriate parts of your page 2 Change the <body> section to contain the text that you want the page to display The lines inside the documentwrite() statements write the text out to the document on the fly A cookie has an expiration date, after which it s no longer available This example creates cookies that expire in six months If you want your cookies to live longer (or not so long), adjust the JavaScript code near the top that sets a value for expireDate Thus, the following example increases the current expiration date by six months:

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expireDatesetMonth(expireDategetMonth()+6)

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Working with jQuery and FancyBox Lightbox

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In days of yore, it was commonplace to use browser pop-ups to present additional information about your Web site In fact, we even used this technique in the last edition of this book Owing to overuse at some unscrupulous Web sites, plus their annoying in-your-face nature, pop-ups are now mostly blocked by major browsers and that s probably a good thing! Instead of pop-ups, we now recommend using lightboxes This may sound like a weapon out of Star Wars or a tool used by photographers (that last guess is close) In this case, however, a lightbox is a tool that displays images, HTML content, and multimedia atop of a Web page Dozens of different lightboxes are available on the Internet Please use your favorite search engine to check those out if you want to know more Here, we only discuss jQuery and FancyBox If you re unfamiliar with jQuery, think of it as a popular JavaScript library that you can reference without writing much real code yourself (We don t dig much into jQuery in this book, but you need only do a Web search on this

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Part IV: Scripting and (X)HTML in Java Paint PDF417 in Java Part IV: Scripting and (X)HTML

Part IV: Scripting and (X)HTML in Java

Paint PDF417 in Java Part IV: Scripting and (X)HTML