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AJAX stands for Asynchronous JavaScript and XML, which is a way JavaScript can obtain information from an XML file without the need to reload a page For example, a synchronous request to the Web server requires that the current page be reloaded to use the new information An asynchronous request allows the information to be obtained and used without the need to wait for the entire page to reload This type of scripting is useful in progressive enhancement, as it allows applications to enhance the user experience for those with JavaScript enabled in modern browsers Instead of waiting for a page to load again, the information can be obtained and used on-the-fly

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In JavaScript, an XMLHttpRequest object is created, which can then be used to make HTTP requests to the server in the background and allow the user to continue using the application without interruption In-depth coverage of this topic is beyond the scope of a beginner s guide; however, more information on AJAX and how to use it in your applications can be found at the following Web sites:

and JSP server-side markup Click the Options button to change the level of scrutiny of the validation or to suppress certain kinds of errors

There are a number of JavaScript libraries available that can help you write higher-level scripts with less effort than it would take to write all of the code from scratch Some of these are listed here in case you would like to look into them further:

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Although validation and browser compatibility would seem to have much in common, the truth of the matter is that they hardly ever do A page that fails a validation check miserably can work perfectly well in a variety of browsers

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Where can I find free cut-and-paste JavaScript code on the Web http://javascriptinternetcom http://webdeveloperearthwebcom/webjs wwwjavascriptcitycom Where can I learn more about JavaScript https://developermozillaorg/en/JavaScript wwwjavascriptkitcom wwwquirksmodeorg/js/contentshtml wwwpageresourcecom/jscript Where can I learn more about Cascading Style Sheets wwww3schoolscom/Css/defaultasp wwwcsszengardencom Where can I learn more about DHTML http://webreferencecom/dhtml wwwdynamicdrivecom

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The Validation panel displays problems with the structure of the code according to official standards, but standards committees aren t in the business of producing browser software Internet Explorer in particular is notorious for letting sloppy HTML code slide, while Netscape has the bad habit of ignoring little-used tags such as <legend> and <label> Some tags, such as <optgroup>, have yet to receive support from any of the major browsers In theory, the best cross-browser, cross-platform, cross-device-compatible code should always comply with markup standards, but in practice you can get away with much The cross-browser-compatible code that Dreamweaver produces routinely fails validation checks! If you have to choose between validation and compatibility, go with compatibility See the next Scenario and Solution sidebar for a quick reference to sum up the differences between compatibility reports and validation reports

1 Which of the following lines does not create a JavaScript syntax error A var myvar= cool; B function 1cool() C documentwrite( Is there an error ); D windowalert what is this ); 2 Which of the following lines does not create a JavaScript syntax error A var else=3; B windowalert( Cool! ); C documentwrite( Cool! ); D function while() 3 __________ errors are often tougher to find because the syntax of the code is correct 4 __________-__________ scripting might allow someone to obtain information from a user

A True B False 7 __________ stands for Asynchronous JavaScript and XML 8 JavaScript __________ may make some advanced coding tasks easier by making the code

The time has come to run some diagnostics on the Mad Science LLC site You didn t do any hand coding for this project, so it should be interesting to see how well Dreamweaver fared

9 JavaScript should be used for password protection of important information A True B False 10 A __________ is a small text file that is stored on the end user s computer 11 Which property is used to set and read a cookie A The cookie property of the window object B The cookie property of the document object

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