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717Chapter 38PHP and JavaScript



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This form admittedly doesn t actually do very much yet but the point is that it would obvi- ate one or two trips from client to server and back. It also demonstrates another of the inter- esting effects PHP developers can get by experimenting with JavaScript. SummaryJavaScript is a client-side scripting language that is highly efficient at many tasks that do notrequire server-side processing. Not everyone will want to use JavaScript, which has long- standing usability and security issues, but for those who do, the combination of client-sideand server-side programming languages can offer an attractive combination of functionalities. PHP and JavaScript have different object notations. JavaScript uses the so-called dotnotation, whereas PHP uses the arrowor C++ style notation. JavaScript is thoroughly object-oriented, whereas PHP treats objects as an optional feature. The good news is that you ll never confusea JavaScript object for a PHP object, or vice versa. The bad news is that you cannot accessthe same object from both languages. It s often possible to implement a feature in both a client-side and a server-side way. Users withJavaScript-enabled browsers can enjoy greater speed and convenience, whereas those withoutcan still get the functionality. This makes it possible to consider using JavaScript without itsgreatest drawback, which is unpredictability leading to alienation of segments of the userbase. Perhaps the greatest service PHP can perform for JavaScript is to enable database connectivity resulting in what we might call Dynamic JavaScript. JavaScript, being purely a client-side technology, cannot query a server-side database for variable data with which to dynamically generate content. Without a server-side helper like PHP, JavaScripts must beupdated by hand whenever variable data is changed. PHP s capability to pass in up-to-datevariables from a data store can make it considerably less labor intensive to maintainJavaScript-enabled forms and functions. …
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