Essential JavaScript for Web Professionals by Dan Barrett, Micah Brown, Dan Lifingston

By Dan Barrett, Micah Brown, Dan Lifingston

* construct larger sites with JavaScript-right now!* absolutely up-to-date for the newest JavaScript criteria and browser aid* examine from real-world examples and dwell perform sites* Browser detection, dynamic content material, CSS, rollovers, logins, navigation, debugging, and more!By award-winning internet developer Dan Barrett, whose consumers have integrated Hewlett-Packard, digital Arts, and Pacific Bell.Don't waste it slow or cash on a big JavaScript ebook! study the suggestions you will particularly use-right now, fingers on, by way of instance, from one of many world's most sensible internet builders. you will grasp JavaScript through development genuine perform websites that promote items, train viewers, supply subscriptions, reveal ads-even implement safeguard. better of all, the completed websites are at the Web-so you could reuse the code, and spot precisely how your pages may still glance and paintings totally up-to-date for the most recent criteria and browsers, crucial JavaScript for net execs, moment variation is just the quickest strategy to achieve the JavaScript abilities you wish most.You'll grasp all this and masses more:* Detecting browsers and structures* growing dynamic content material* profiting from CSS and layers* imposing logins* growing rollovers* bettering your site's navigation* including blunders dealing with on your types* producing and coping with home windows and frames* Debugging your JavaScript code* Writing code that is effortless to keep up

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Extra info for Essential JavaScript for Web Professionals

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We put in the setTimeout method, which will call the off1 function after a delay of 700 milliseconds. 4. We created the off1 function. This function runs two tests using if statements: First, it checks that the value of over_checker is set to “off,” and then it checks that the user's browser supports rollovers. If both of these tests return a value of true, then the function sets the Prod ucts image to the on position. We have been introduced to some new aspects of JavaScript in this script: • • The setTimeout method.

The first thing we want our event handler to do is to call our on function. To call a function you simply call its name and enclose any values you wish to pass along to the function in parentheses separated by commas. on('Products'); The preceding statement will call the on function and pass it the value Products; again, we are passing it Products because that is the name of the image that we want our function to affect. Another common addition to rollovers is the displaying of a relevant phrase in the browser's status bar.

Therefore, when the user rolls over one of the other categories, both that graphic and the graphic for the section that the user is currently in will be highlighted. This could lead to some confusion on the part of the user, so what we need to do is turn off the graphic of the section we are currently in while the user rolls over one of the other categories. To do this we are going to have to make slight modifications to both the on and the off functions, as well as create a new function, off1, that will handle some of the extra functionality we are going to need.

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