[ http://issues.apache.org/struts/browse/STR-2142?page=all ]
David Evans closed STR-2142:
----------------------------
Resolution: Fixed
> Replacement of LookupDispatchAction
> -----------------------------------
>
> Key: STR-2142
> URL: http://issues.apache.org/struts/browse/STR-2142
> Project: Struts Action 1
> Type: Improvement
> Components: Extras
> Versions: 1.1 Final
> Environment: Operating System: All
> Platform: All
> Reporter: Jean-Baptiste Nizet
> Assignee: David Evans
> Priority: Minor
> Attachments: ParameterDispatchAction.java, ParameterDispatchAction.java,
> SelectAction.java, SelectAction.java, SelectAction.java, SelectAction.java,
> SelectAction.java, SelectAction.java, SelectAction.java,
> strings_properties_patchfile.txt
>
> LookupDispatchAction is useful as a DispatchAction when you have multiple
> buttons on the same form. However, I think another powerful way to solve this
> problem could be used: select a method from a list defined in the mapping
> parameter attribute by checking the presence of o request parameter name.
> See the following cut'n pasted javadoc for details, and see the following
> attachment for an implementation.
> /**
> * This class has the same goal as the DispatchAction: select the appropriate
> * method to execute based on a request parameter. The way to determine which
> * method to call works in a different way, though. The parameter attribute
> of
> * the mapping contains a list of method names. If one of the request
> parameters
> * has the same name as one of the method names specified in the list of
> method
> * names, this method is executed. If none of the request parameters has one
> * of the method names, the unspecified method is invoked. <br />
> * This class has the same goal and utility as the LookupDispatchAction: it
> * allows having several submit buttons on the same form. All that is needed
> with
> * this class is to give each button a different name (example: preview/post).
> * It's more powerful than the LookupDispatchAction for several reasons,
> though:
> * <ul>
> * <li>The submit buttons don't need to be declared in the various
> * internationalized ApplicationResources.properties files (useful if
> JSTL
> * tags are preferred to the Struts tags)</li>
> * <li>It's more performant</li>
> * <li>Two submit buttons may have the same text</li>
> * <li>Links can easily use this kind of action as well as buttons
> * (ex: doThis.do?preview=&subject=...)</li>
> * <li>Hidden fields may easily be used to select the method
> * (ex: <input type="hidden" name="preview"/> )</li>
> * <li>There is no need for the developer to override any abstract
> method</li>
> * </ul>
> * @author Jean-Baptiste Nizet
> */
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