vb.net barcode Rendering a Message for a Specific Component in the Page in Java

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Rendering a Message for a Specific Component in the Page
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The <h:message> tag places into the view a UIMessage component associated with a javax facesMessage Renderer Whenever the user places a <h:message> tag in the page, they are
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required to provide a for attribute that gives the componentId of the component for which this tag will display messages This gives the page author complete freedom to display the messages however they like in the page The 12 version of the specification fixes a problem with earlier versions of JSF in which you couldn t put the <h:message> tag in front of the component to which it refers unless both the tag and the component were in the same <h: form> Also in 12, a dir attribute has been added that lets the page author give a cue to the Renderer about the direction of the text, either left to right (LTR) or right to left (RTL) This Renderer gets an Iterator of messages from the FacesContext by calling its getMessages( ) method, and passing the value of the for attribute Only the first message in the Iterator is rendered (See 19 for complete information on <h:message>)
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PART I PART I PART I
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Rendering All the Messages in a Page
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The <h:messages> tag places into the view a UIMessages component associated with a javaxfacesMessages Renderer Whenever the user places a <h:messages> tag, all messages in the FacesContext are displayed, unless the globalOnly attribute is set, in which case only messages that are not associated with a given component are displayed The layout attribute can be either table or list If table, the messages are displayed in an HTML table; if list, they are displayed in an HTML unordered list (Again, see 19 for complete information on <h:message>)
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The Standard Message Keys
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Table 7-4 lists the standard message keys in JSF 12 The FacesMessage instances around which these messages are built are all generated during the Apply Request Values phase if the component has its immediate property set, and during the Process Validations phase otherwise The severity of all these FacesMessage instances is SeverityERROR
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Customizing the Content of One of the Standard Messages
The default content for the standard messages is pretty dry and may not be what you want in your application For example, the standard message for javaxfacesvalidator LengthValidatorMINIMUM is Validation Error: Value is less than allowable maximum of {0} , which can be pretty cryptic to some Because of the specification for how FacesMessage instances are produced, it is possible to provide your own ResourceBundle that is consulted before the standard one, thus allowing you to override any of the standard messages, as well as provide your own for any custom Converter or Validator implementations you may have To do this, simply create an <application> element in your faces-configxml file (if you don t have one already) and add a <message-bundle> element inside of it Note that DTD and Schema are very ordering-dependent so you must place the message-bundle element in the right order if you have other elements in your <application> element Full details of the element ordering can be found in 18 The following is the <application> element for the Virtual Trainer:
<application> <message-bundle>comjsfcomprefMessages</message-bundle> <locale-config> <default-locale>en</default-locale> <supported-locale>de</supported-locale> </locale-config> </application>
Part I:
The JavaServer Faces Framework
messageId javaxfacescomponentUIInputCONVERSION javaxfacescomponentUIInputREQUIRED javaxfacescomponentUISelectOneINVALID javaxfacescomponentUISelectManyINVALID javaxfacesconverterBigDecimalConverterDECIMAL javaxfacesconverterBigIntegerConverterBIGINTEGER javaxfacesconverterBooleanConverterBOOLEAN javaxfacesconverterByteConverterBYTE javaxfacesconverterCharacterConverterCHARACTER javaxfacesconverterDateTimeConverterDATE javaxfacesconverterDateTimeConverterTIME javaxfacesconverterDateTimeConverterDATETIME javaxfacesconverterDateTimeConverterPATTERN_TYPE javaxfacesconverterDoubleConverterDOUBLE javaxfacesconverterFloatConverterFLOAT javaxfacesconverterIntegerConverterINTEGER javaxfacesconverterLongConverterLONG javaxfacesconverterNumberConverterCURRENCY javaxfacesconverterNumberConverterPERCENT javaxfacesconverterNumberConverterNUMBER javaxfacesconverterNumberConverterPATTERN javaxfacesconverterShortConverterSHORT javaxfacesconverterSTRING javaxfacesvalidatorNOT_IN_RANGE javaxfacesvalidatorDoubleRangeValidatorMAXIMUM javaxfacesvalidatorDoubleRangeValidatorMINIMUM javaxfacesvalidatorDoubleRangeValidatorNOT_IN_RANGE javaxfacesvalidatorDoubleRangeValidatorTYPE javaxfacesvalidatorLengthValidatorMAXIMUM javaxfacesvalidatorLengthValidatorMINIMUM javaxfacesvalidatorLongRangeValidatorMAXIMUM javaxfacesvalidatorLongRangeValidatorMINIMUM javaxfacesvalidatorLongRangeValidatorNOT_IN_RANGE javaxfacesvalidatorLongRangeValidatorTYPE
TABLE 7-4 The Standard Message Keys
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This states that the application resource bundle should be comjsfcomprefMessages and that the default locale for the application is English, but German is supported also (See 12 for details on internationalizing JSF applications) All that remains now is to author the Messagesproperties and Messages_deproperties files The following is a snippet from the Messagesproperties file Notice the use of the standard LengthValidator to ensure the user s password is at least six characters long
javaxfacesvalidatorLengthValidatorMINIMUM=\ Not long enough Make it longer!
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