Introduction
Often, we have multiple submit buttons within a single form. The below is just a simple way of identifying which button was clicked, and which actions to take.
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There are other ways to achieve the same functionality. There are pros and cons to each methods. Feedback welcome.
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This was originally taken from comment posted by Nyong Nyong to this page - you can see it here |
The more elegant solution is probably by using multiple mappings for same Action.
In JSP
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<s:form method="post" action="mySubmitAction">
<s:submit value="Submit"/>
<s:submit value="Clear" action="myClearAction"/>
</form>
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In struts.xml
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<action name="mySubmitAction" class="MyAction" method="submit">
<result>submit.jsp</result>
</action>
<action name="myClearAction" class="MyAction" method="clear">
<result>submit.jsp</result>
</action>
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Then in MyAction class
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public String submit() throws Exception {
// submit button logic here
return SUCCESS;
}
public String clear() throws Exception {
// clear button logic here
return SUCCESS;
}
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For best practice, if you have common data loaded / managed by your actions (submit & clear), then for example, you can define a MyBaseAction class, extended by MySubmitAction and MyClearAction class. Then this is how they looks like:
In struts.xml
| Code Block |
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<action name="mySubmitAction" class="MySubmitAction">
<result>submit.jsp</result>
</action>
<action name="myClearAction" class="MyClearAction">
<result>submit.jsp</result>
</action>
|
You don't need to specify a method name anymore, that means we will use the default execute() method.
Then in the MyAction, MySubmitAction and MyClearAction class
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public class MyAction extends ActionSupport {
// common data or logic here
}
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| Code Block |
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public class MySubmitAction extends MyAction {
public String execute() throws Exception {
// submit button logic here
return SUCCESS;
}
}
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| Code Block |
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public class MyClearAction extends MyAction {
public String execute() throws Exception {
// clear button logic here
return SUCCESS;
}
}
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