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There are three form fields, name, email, and message. Each field has a corresponding <label> tag. The label element is a useful aid to accessibility. Using the for attribute, it specifically associates a piece of text with a form field. This can be of tremendous value to screen-reading software. The label element can be equally valuable to visitors without any visual impairments. Many browsers create a default behavior for label elements: if the text within a label is clicked, the associated form field is brought into focus. This is a really nice little usability enhancement. Unfortunately, not all browsers implement this behavior. The behavior might not be implemented by default, but there s no reason why you can t add it yourself. All you need is a few lines of JavaScript. 1. 2. 3. 4. 5. Get all the label elements in the document. If the label has a for attribute, attach an event handler. When the label is clicked, extract the value of the for attribute. This value is the id of a form element. Make sure the form element exists. Bring that form element into focus.

This statement type consists of two statements: try-catch and throw. The try-catch statement consists of a try block enclosed in curly braces, followed by a catch block enclosed in curly braces too. Any exception that is thrown within the try block causes execution to jump to the catch block, where you can look at the exception and handle it gracefully. You saw the try-catch statement in the previous code sample. The throw statement enables you to do exactly that throw exceptions that can then be caught by a try-catch. In code it looks like this: public boolean myMethod() { int i = 99; if(i == 99) { throw::error; } } Thrown exceptions are passed up until they are either caught by application code in the execution chain or they reach the standard exception handler.

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Another important caveat is that, while the integration tests may be run less often than the isolated tests, they must still be run automatically (e.g., on a nightly schedule). As soon as people forget to run the tests, they ll be run less and less often, until they become so out-of-sync with the code base that half of them don t pass anymore; the effort involved to fix them means they ll most likely just be abandoned. So it s really important to set up the integration tests to be run automatically!

Macros are a contentious subject in object-oriented languages. They cloud the readability and purpose of the code, introduce their own syntax, are not objects, and can t be debugged. However, they do have their uses.

Call the function focusLabels in global.js and execute the function when the page loads using addLoadEvent. function focusLabels() { if (!document.getElementsByTagName) return false; var labels = document.getElementsByTagName("label"); for (var i=0; i<labels.length; i++) { if (!labels[i].getAttribute("for")) continue; labels[i].onclick = function() { var id = this.getAttribute("for"); if (!document.getElementById(id)) return false; var element = document.getElementById(id); element.focus(); } } } addLoadEvent(focusLabels); Load contact.html in a web browser. Clicking the text in a label brings the associated form field into focus. Depending on the browser you re using, this may have always been the case. However, you ve leveled the playing field. All browsers will execute this behavior now.

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