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<rich:message for="age" /> </h:panelGroup> <h:outputText value="Name:" /> <h:panelGroup> <h:inputText id="name" value="#{userBean.name}" required="true" requiredMessage="Name is required" validatorMessage="Name is too short"> <f:validateLength minimum="3" /> <a4j:support event="onblur" /> </h:inputText> <rich:message for="name"/> </h:panelGroup> </h:panelGrid> <h:commandButton action="enterpub" value="Let me in!"></h:commandButton> </h:form> When you run this application, one problem you will notice is that when you tab out (or click somewhere else) from the first input, the second field is validated as well. Well, this is the correct behavior. The complete form is submitted no matter from which field you tab out of. Basically, the whole page is a region (<a4j:region>), which means that all the components will be processed on the server. So, the other component is validated, and you get an error message. In addition, because you use the <rich:message> component, the component is always rerendered, so the error message is shown in the browser.

With apologies to Jakob Nielsen, a developer will spend far more time working with other people s code than with your code. Each major framework has a distinct coding style that can be seen in the structure of its API, the order of arguments, and even its code formatting. (Spaces, not tabs! No tabs, not spaces!) Follow those conventions! Make your add-on feel like a part of Prototype. Design your classes to take an options argument. Embrace the patterns, coding style, and lexicon. Nobody reads the documentation (at least not at first), so even the smallest details of code writing can help a person intuit how to use your code.

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The next thing you might notice are the h:message tags, which, as you might have guessed, display messages. Many first-time JSF developers are surprised when their pages are simply redisplayed on a validation or conversion error. Without including a message component, you won t see any messages. So, before you point the finger at a malfunctioning button or navigation rule, make sure there aren t some missing message components. You ll also notice that we ve used the style attribute to change the message color to red. In a production system, you would want to use a style class instead. We ve also taken advantage of f:convertDateTime and f:convertNumber to help us with our conversions. Now, if the properties we re binding our components to are primitives, Strings, BigInteger, or BigDecimal, JSF will automatically pick the proper converter for us. However, we re on our own with date values, and here we ve chosen to say that our Amount field must have two decimal places since it represents a currency. You can see from the code that we want our Date field

All of the classes in Prototype and script.aculo.us share a powerful design principle: they re able to be exhaustively configurable and dead-simple to use at the same time. Is there anything about your code that someone might need to tailor to his needs Does your widget set a background color Make it a configurable option. Does your date picker control support arbitrary date formats (like DD/MM/YYYY, which is the most common format outside of North America) If not, write it now; someone will ask for that feature. Does your widget fade out over a span of 0.5 seconds Someone will argue passionately for it to be 1 second instead.

3. Yes, we know that tables aren t ideal for page layout, but this is just an example!

That takes care of the exhaustively configurable part. To make your add-on deadsimple to use, take care to hide this complexity below the surface until it s needed. Make as many options as you like, but give an intelligent default for each one. Make sure the options argument can be omitted together. They re called options because they re optional; if a particular parameter can t have a default and can t be omitted, move it out of the options object and into a positional argument.

This is probably not the most user-friendly experience. Consider if you have more input fields on a page. You tab out from the first one, and all other input fields have been validated as well and now display error messages. Not very user friendly! From the previous chapter you know that you can limit what is being processed on the server. One option is to wrap components to be processed within the <a4j:region> tag. But you can also use the ajaxSingle attribute. Let s use that in the following example: <h:form> <h:outputText value="RichFaces Pub" /> <h:panelGrid columns="2"> <h:outputText value="Age:" /> <h:panelGroup> <h:inputText id="age" value="#{userBean.age}" size="4" required="true" requiredMessage="Age required" validatorMessage="You must be 21 or older to drink"> <f:validateLongRange minimum="21" />

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