tailieunhanh - JavaScript Bible, Gold Edition part 142

JavaScript Bible, Gold Edition part 142. This book will bring programmers and non-technical professionals, including casual programmers and scripters, painlessly up to speed on all aspects of mastering JavaScript. Key topics include programming fundamentals, JavaScript language elements and how to use them effectively, and how to easily and efficiently add powerful new functionality to HTML documents and Java applets. | 1258 Part V Putting JavaScript to Work International characters While international characters are fine for HTML content they should not be used in signed scripts. The problem is that international characters are often converted to other character sets for display. This conversion invalidates the signature because the signed and recalculated hash values don t match. Therefore do not put international characters in any signable script item. If you must include such a character you can escape it or in NN4 put such scripts in unsigned layers. Cross-Browser Dynamic HTML Issues Level 4 browsers and later NN4 and IE4 were the first browsers to include World Wide Web technologies that gave page authors far more control over the display and interactive behavior of Web page content. Lumped together under the heading of Dynamic HTML DHTML these technologies dramatically extended the simple formatting of standard HTML that page authors had used for years. These days scripters and designers coming to Web development for the first time take DHTML capabilities for granted they are probably unaware that plain ol HTML is little more than a specification to format static text and images on a page. A lot of what the user gets with DHTML had previously been accomplished only via Java applets and plug-ins such as Shockwave. Not that DHTML eliminates these technologies from the Web author s arsenal DHTML doesn t do sound or video for example but because DHTML can accomplish much more of what authors look for in assembling page content and layout without the long downloads of applets or plugin content it becomes an attractive way for nonprogrammers to spice up Web applications. Perhaps categorizing DHTML authors as nonprogrammers is not quite right. DHTML also adds significantly to the vocabulary required to incorporate dynamic content into pages. Suddenly HTML becomes a lot more programming than simply adding tags to existing content. And if you want to do dynamic positioning of .