Pass an input value directly as action method argument

问题

Is there a way to do pass an input value as a action's parameter without using managed properties?

i.e.

<h:form>        
    <h:inputText id="input" />  
    <h:commandButton action="#{someBean.doSome(input)}" />  
</h:form> 

回答1:

Yes, it's during the form submit already there in the JSF component state. Just bind the input component to the view by binding attribute, which will reference an UIInput instance, which in turn has a getValue() method for the very purpose of retrieving the input value (so that you can pass it as action method argument):

<h:form>        
    <h:inputText ... binding="#{input}" />  
    <h:commandButton ... action="#{someBean.doSome(input.value)}" />  
</h:form> 

The properness of this approach is however highly questionable and depends on concrete functional requirements. This approach is namely basically tight-coupling the view with the model and therefore considered a bad practice.

See also:

• How to send form input values and invoke a method in JSF bean
• How does the 'binding' attribute work in JSF? When and how should it be used?

回答2:

This is what worked for me: In Java: String dna=this.dna;

来源：https://stackoverflow.com/questions/18340851/pass-an-input-value-directly-as-action-method-argument