CODEWITHSUNDEEP
spring-webflow-2
Vivek Agrawal21
Vivek Agrawal21

Reputation: 332

No view state in Spring WebFlow

I am using springwebflow 2.0 in my application.
Since the application is growing, I am having large number of webflows. Now I need to create a separate webflow for a particular event like "onchange event of dropdowns."
For all the jsps in my application on the event of "onchange" I want a separate webFlow DomainFetcher-flow.xml to run and return some value.

So far my domainFetcher-flow.xml looks like 
<?xml version="1.0" encoding="UTF-8"?>
 <flow xmlns="http://www.springframework.org/schema/webflow"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.springframework.org/schema/webflow    http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">
 <on-start>
     <evaluate expression="domainFetcher.fetchTableDomain()"    result="conversationScope.selectDataJSON"/>
 </on-start>

Right now I am getting an exception that at least one view state should be defined. So looking for a solution...

Upvotes: 1

Views: 704

Answers (1)

Prasad
Prasad

Reputation: 3795

Yes you can define a subflow without a view state. For example, you have below parent flow which invokes subflow subflow-flow.xml as :

    <?xml version="1.0" encoding="UTF-8"?>
    <flow xmlns="http://www.springframework.org/schema/webflow"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/webflow
            http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">  
        ... 
        <subflow-state id="subflow-flow" subflow="subflow-flow">
            <transition on="endOfSubflow" to="someStateWithMessage"/>
        </subflow-state>
        ...
    </flow>

Then in subflow you can perform some action. You can define subflow-flow.xml as:

    <?xml version="1.0" encoding="UTF-8"?>
    <flow xmlns="http://www.springframework.org/schema/webflow"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/webflow
            http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd"
            start-state="start">            
        <action-state id="start">
            <evaluate expression="yourAction.performSomeAction(flowRequestContext)"/>
            <transition to="endOfSubflow"/>
        </action-state>
        ...
        <end-state id="endOfSubflow"/>
    </flow>

In your action class:

    public class YourAction{
    ...
    public void performSomeAction(RequestContext context){
        //do what you want in this method.

    }
    ...
    }

Hope this helps.

Upvotes: 1

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