How to show a personalized error/warning/info message in a popup window?

Hi I want to show a popup message about errors or warnings in my app, for example if a user try to enter a registry that is already in the data base. I'm working with JSF and my app doesn't add a registry that is already in开发者_运维问答 the data base but I need to show a message that informs the user about that. Thanks.

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This answer is specifically for icefaces (since I read in comments that the @Mel is working with icefaces.

To open a popup in icefaces:

<ace:dialog widgetWar="mydialog">
    <h:outputText value="This is a dialog" />
</ace:dialog>

Then call this popup in your xhtml code like this: E.g. I am using a command link that when clicked opens the popup.

<h:commandLink onlick="mydialog.show()" action="#{myBean.doSomething()}" />

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To show messages in dialog:

<h:form id="myform">
<ace:dialog id="mydialog" widgetWar="mydialog">
    <h:panelGrid columns="1" width="100%">
        <ace:messages id="allMsgsAdd" initEffect="highlight" for="myform:mydialog" />
    </h:panelGrid>

    <h:outputText value="This is a dialog" />
</ace:dialog>
</h:form>

Then you can use this code to push messages to the ace:message you just created.

FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(SEVERITY_INFO, "My Message", null));

Please note that SEVERITY_INFO is a FacesMessage defined constant. You will need to import it. Depending on whether you need to show warning or error to user, you can import these

import static javax.faces.application.FacesMessage.SEVERITY_ERROR;
import static javax.faces.application.FacesMessage.SEVERITY_INFO;

Also note the first parameter of addMessage() method. You will notice that I am passing null as the first paramter. See here, and you will find that the first paramter is the client id, which basically means that which client do you want to send this message to. If clientId is null, this FacesMessage is assumed to not be associated with any specific component instance. So all of the message dialogs in your page will receive this error/warning. If you wish to ONLY show the message on the dialog, you need to pass your dialog client id here like this:

FacesContext.getCurrentInstance().addMessage("myform:mydialog", new FacesMessage(SEVERITY_INFO, "My Message", null));

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You can try to use some existing open source JSF component library .Many of them already provide the pop-up UI . For example ,Richfaces provides it by . You can refer to this official link to see how to use : http://docs.jboss.org/richfaces/latest_3_3_X/en/devguide/html/rich_modalPanel.html

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Check my asnwer in another question, maybe it will be useful for you

How do I get a richfaces modal window to display without an onclick event?

This will show your exception messages (or another message added by you in middle of the code) in a <rich:modalPanel>.