itextsharp barcode example vb.net This produces the following HTML output, which, of course, is rendered by the browser in Java

Making Data Matrix ECC200 in Java This produces the following HTML output, which, of course, is rendered by the browser

This produces the following HTML output, which, of course, is rendered by the browser
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<p>Enter a number from 1 to 10: <input type="submit" id="numberField"></input></p> <input type="submit" value="Submit"></input>
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If the user clicks Submit with no value entered, the page will be redisplayed with a message stating that a value must be provided, as shown at right This is an example of the required validation facility in action, described later in the chapter If the user enters a non-number value, the page will be redisplayed with a message stating that the value must be a number, as shown next at right This is an example of the implicit conversion facility, described later in the chapter Because the value entered by the user is stored in the value expression #{beannumber}, the system knows the expected type is javalangLong Therefore, it is able to apply the LongConverter to the value before performing the validation Implicit converters are available for all Java language primitives and their respective wrapper types, though the set of implicit converters may be extended as described in the section on custom converters If the user enters a number that is not between 1 and 10, the page will be redisplayed with a message stating that the value must be between 1 and 10, as shown here
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7:
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C o n v e r t i n g a n d Va l i d a t i n g D a t a
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This is an example of using one of the four standard validator tags provided by Faces The standard validator tags are covered in the section Using JSP to Associate a Validator with a UIComponent Instance later in this chapter In all cases, the invalid data remains in the text field to aid the user in correcting the error Also, note that both validation and conversion failures appear to the user in the same way: with a specific message stating what is wrong and how to fix it While the user doesn t know or care that conversion and validation are distinct processes, it is important for you to understand the distinction: conversion guarantees the data is in the expected type, and validation guarantees that it is valid given the application-specific constraints
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PART I PART I PART I
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E XPERT GROUP I NSIGHT Some frameworks, such as Tapestry, do not have a separate conversion
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facility The Expert Group felt that the expressive power offered by having a separate conversion concept outweighed the complexity it introduced, especially since the implicit conversion facility substantially mitigated the complexity by hiding conversion in many cases The next example uses one of the three standard converter tags
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<p>Interest Rate: <h:outputText value="#{ratesprime}}"> <f:convertNumber type="percentage"/> </h:outputText></p>
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The following HTML is rendered from this example:
<p>Interest Rate: 522%<p>
Although all three standard converter tags are explained in detail in the section Explicit Conversion via JSP Tags later in the chapter, it is useful to note one point now: Converters can be associated with input or output components, but validators may only be associated with input components This makes sense because it is impossible for invalid data to enter the system if the developer has properly used the validation system; therefore, there is no need to validate data on output The final example in this section shows a reasonably complex application of conversion and validation for an inventory tracking system The user has to enter a valid Stock Keeping Unit, or SKU, that actually is in the inventory
<h:outputText value="#{bundleskuLabel}" /> <h:inputText value="#{productsku}" required="true" id="sku" size="8"> <f:validator validatorId="skuConverter" /> <f:converter converterId="skuValidator" /> </h:inputText> <h:message styleClass="errorMessage" for="sku" />
This example again shows the required facility and a custom validator that looks for the item in the inventory It renders a simple label and text field Notice that two validators and a converter are attached to the text field The explicit skuConverter ensures that the user has entered something that can be considered an SKU The required attribute simply states that a value is required, and the skuValidator ensures that the item is in the inventory The <h:message> tag directs the system to place the error message, if any, at that point in the page This example shows how you can extend the Faces framework by providing custom converters and validators that are specific to your business logic needs Custom converters and validators are dealt with in turn later in the chapter
Part I:
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