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try { //If we are using Internet Explorer. xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch (E) { //Else we must be using a non-IE browser. xmlhttp = false; } } // If we are not using IE, create a JavaScript instance of the object. if (!xmlhttp && typeof XMLHttpRequest != 'undefined') { xmlhttp = new XMLHttpRequest(); } xmlhttp.open("GET", "email.php action=checkemail&email=" + escape(email), false); xmlhttp.send(null); if (xmlhttp.readyState == 4 && xmlhttp.status == 200) return xmlhttp.responseText == '1'; } function validateForm(frm) { if (!isValidEmail(frm.email.value)) { alert('The email address you entered is not valid'); return false; } return true; } </script>
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This second example now uses your PHP function to validate the e-mail address, rather than JavaScript, as in the first example. One small thing to note in this code is that you set the asynchronous flag to false in the xmlhttp.open() call. This is because you want to stop and wait for the Ajax response, and then return true or false to the validateForm() function. In this particular instance, the code is somewhat longer when using Ajax to validate the form, but in other situations you may find that the processing you need to do cannot even be achieved by using JavaScript, therefore requiring you to use PHP anyway. Validating user input in this way will slow down your application slightly, but this is the trade-off for better protecting your code. As always, you should still be processing the form data on the server side when it is submitted.
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As just shown, there are several security issues to consider when implementing your Ajax application. As the technology continues to become more and more prevalent in today s web applications, and developers are called on to create systems based entirely in JavaScript, it is important to remember some of the key points discussed in this chapter. Of particular importance is the server-side sanitization and validation of user input, as dealing with this correctly will maintain the security of your servers and data. Now that we have gone through the key aspects of building, maintaining, and securing Ajax- and PHP-based web applications, it is time to work on the complexities of debugging and testing applications both on the client and server side. In 13, we will have a look at some of the more developer-friendly tools available that will help you to build the most bug-free and functional applications possible.
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he testing and debugging of JavaScript-based applications has long been a difficult task, primarily due to inconsistencies between platforms and browsers, and also due to a lack of developer tools. To further complicate matters, a new browser war has emerged, with Firefox strongly challenging the once dominant Internet Explorer for its share of the market. Many developers have now switched to Firefox, because of its wide range of browser extensions and closer standards compliance. Unfortunately for Firefox lovers, the market is still dominated by the use of Internet Explorer, and therefore developers must ensure compatibility with it, as well as other emerging browsers such as Safari and Opera. In this chapter, we will look at the various tools and extensions available for Firefox and Internet Explorer, and how to use them with your everyday JavaScript development.
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When you begin working with JavaScript, you will soon learn that not all browsers are created equally. I began my JavaScript debugging endeavors years ago using the Internet Explorer interface. Sadly, doing so can be frustrating. The basic JavaScript error system (see Figure 13-1) for Internet Explorer consists of a pop-up warning saying that an error has occurred with the script on the page. Not only is the error message nondescriptive, but it doesn t tell you exactly where in your code the error occurred. If your JavaScript code is inline in your HTML document, the line numbers will generally match up; but as soon as you use an external JavaScript file, it becomes extremely difficult to pinpoint where an error occurred.
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