Why does required=“true” not fail validation when disabled=“true” is specified

问题

<a4j:outputPanel id="tapalSectionSendToPanel" ajaxsingle="true">
    <h:inputText id="sendToId1"  value="#{MainBean.SectionBean.sendTo}" 
        class="createresizedTextbox" 
        required="true" requiredMessage="#{msg.labl_required}"
        disabled="true" />
 <h:message for="sendToId1" style="color:red" />
</a4j:outputPanel>

i need to validate textbox for empty validation and should show required when i click button without entering any value in textbox. It works fine without disabled="true". Whats the alternative for my requirement.

回答1:

disabled="true" disables the input (so it's skipped when the form is submitted), if you don't want the user to type in it use readonly="readonly"

回答2:

First, required and disabled don't go well together, because they are mutually exclusive as per the JSF Spec:

required: Flag indicating that the user is required to provide a submitted value for this input component.
disabled: Flag indicating that this element must never receive focus or be included in a subsequent submit.

Like I said in the comments, you can just display a message when the user tries to submit the form without selecting a node:

<h:inputText id="sendToId1"  value="#{MainBean.SectionBean.sendTo}" 
    styleClass="createresizedTextbox" required="true" readonly="true" />
<h:message for="sendToId1" value="#{msg.labl_required}" 
    rendered="#{facesContext.postback and facesContext.validationFailed}" />

As an alternative you can just display a text anywhere in your markup:

<h:outputText value="#{msg.labl_required}" 
    rendered="#{empty MainBean.SectionBean.sendTo}" />

来源：https://stackoverflow.com/questions/17945126/why-does-required-true-not-fail-validation-when-disabled-true-is-specified

标签

jsf-2

richfaces