Enable JSF commandbutton only if all the other components are error free

I am using icefaces in my application. There is a form in the page, which has a couple of input fields.

I would like to enable the commandbutton only if the fields are valid(no errors for the other components)

Is it possible to do it ?

example code

<ice:form>
<ice:panelGrid  columns="2">
    <ice:outputLabel>Enter Date</ice:outputLabel>
        <ice:panelGroup>
            <ice:selectInputDate renderAsPopup="true" id="InputDate" value="#{Bean.FormDate}" partialSubmit="true" ></ice:selectInputDate> 
                <ice:message for="InputDate" />
        </ice:panelGroup>

     <ice:outputLabel>Days</ice:outputLabel>
        <ice:panelGroup>
            <ice:inputText value="#{Bean.days}"partialSubmit="true" id="inputDays">
                <f:validateLongRange minimum="1" maximum="10"/>
            </ice:inputText>
                <ice:message for="inputDays"/>
            </ice:panelGroup>

    <ice:commandButton value="Su开发者_C百科bmit" action="#{Bean.SomeAction}"></ice:commandButton>
</ice:panelGrid>

In the above code, I want to enable the submit commandbutton only if the days and date are valid(Don't have any error enqueued.

If you are using jsf 2.0 you can do something like this:

    <ice:form>
        <ice:panelGrid columns="2">
            <ice:outputLabel>Enter Date</ice:outputLabel>
            <ice:panelGroup>
                <ice:selectInputDate renderAsPopup="true" id="InputDate"
                    value="#{Bean.FormDate}" partialSubmit="true"
                    binding="#{inputDateComponent}">
                    <f:ajax execute="@this" render="submit inputDateMessage" />
                </ice:selectInputDate>
                <ice:message id="inputDateMessage" for="InputDate" />
            </ice:panelGroup>

            <ice:outputLabel>Days</ice:outputLabel>
            <ice:panelGroup>
                <ice:inputText value="#{Bean.days}" partialSubmit="true"
                    id="inputDays" binding="#{inputDaysComponent}">
                    <f:validateLongRange minimum="1" maximum="10" />
                    <f:ajax execute="@this" render="submit inputDaysMessage" />
                </ice:inputText>
                <ice:message id="inputDaysMessage" for="inputDays" />
            </ice:panelGroup>

            <ice:commandButton id="submit" value="Submit"
                action="#{Bean.SomeAction}"
                disabled="#{!inputDateComponent.valid}" />
        </ice:panelGrid>
    </ice:form>

I haven't tested this specific example but you can see where I'm going. The input fields get evaluated on change and either show validation errors or create a condition where the commandButton is not disabled.

You could also use rendered= and make positive assertions if you want the button to only appear when the input fields are valid.

You could use a phase-listener as described here:

http://balusc.blogspot.com/2007/12/set-focus-in-jsf.html

The phase-listener in this example builds a string with client-ids that have messages attached. Check this string in a bean and create a bean property depending on whether there are ids with messages or not.

Then you can enable the command button depending on the bean property.

Switch each of your input fields to 'immediate="true"' and add a validator to the fields.

Have the validator set/unset a boolean to determine whether the fields contain valid data and do as sparrowhawk suggests and test this boolean value(s) in the rendered expression for the submit button.