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Struts allows developers to validate user input three ways The first way is by using the XML-based Commons Validator Commons Validator allows form input validation to be configured via rules defined in an XML file named validationxml Commons Validator covers many of the simple yet repetitive validation routines such as ensuring that a particular element has received some input, that an input string consists of all numeric digits, or that an input string matches a predefined pattern These cases and more are provided by Commons Validator, and all the developer needs to do is specify the rule (or rules) that must be applied to a particular input field Much if not all of a form s input validation can be performed by specifying rules in an XML file writing nary a line of Java code.

produces the following:

var vitals = { name: "Andrew Dupont", cities: ["Austin", "New Orleans"], age: 25 };

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Commons Validator is best used for simple validations such as a form element being required or an input string that must consist entirely of numeric digits The second way in which Struts allows for input validation is through the validate method of any instance of the ActionForm class All subclasses of the ActionForm may override the default implementation of the validate method, which does nothing Struts always calls the ActionForm s validate method after performing any validation specified in validationxml but before passing the request to an Action class The validate method is a great place to perform validation that is too complex to be covered by Commons Validator If/else conditions that are nearly impossible to specify in validationxml but relatively easy to do in Java code are a good example of validations that can be performed within an ActionForm s validate method.

We can describe data structures in JavaScript with a minimum of syntactic cruft. By comparison, let s see what this data would look like in XML:

To turn off the labels on the buttons, set the following: showButtonsLabel="false" to produce this:

<vitals> <name>Andrew Dupont</name> <cities> <city>Austin</city> <city>New Orleans</city> </city> <age>25</age> </vitals>

The final place in which validation can be performed is within a Struts Action class Like an ActionForm, validation that occurs within an Action must be written in Java The key difference is that the Action class has access to the application s domain and service tiers, so validations that involve querying the database or accessing business rules in the domain tier are best placed within an Action All Action classes can access the ActionMessages object to which error messages can be added..

There are a million different ways to exchange data between client and server; what s so special about JSON Very little, really. It s not magical; it s simply the right tool for the job in JavaScriptheavy web apps. There are JSON libraries for all the common server-side languages: PHP, Ruby, Python, Java, and many others. It s far simpler than XML, and thus far more useful when you don t need all of XML s bells and whistles. We ll revisit JSON in Part 2 of this book when we look into advanced topics in Ajax. But let s familiarize ourselves with the basics right now.

Setting the following: switchByClick="true" will enable you to move values by just clicking them. Double-clicking works by default otherwise. Besides supporting some of the standard events such as onclick and onchange, the component also supports onlistchange. With onlistchange, you can use <a4j:support> to fire an Ajax request when the list changes. In the following code, every time a fruit is either added to or removed from the list, the fruit salad list is updated:

The best way to learn about the structure of JSON is to try it out yourself. Let s create a few different JavaScript data types and see how they look in JSON:

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