Validation with JSF

Question

I want to perform the validation of the form displayed in the image in a different way than the framework requires. The validation would be something like an alert, IE, the user would be informed that can only add data if you select a combo option. This validation should occur after clicking the Add button. Something like: "Select an option before adding". Is this possible without using Javascript? How to do?

Answer 1

You can do what you want.

First add this to your XHTML:

<p:growl id="messageGrowl" />

Then in the method triggered by the button Add, after doing the proper validation, add the following line of code to trigger a message on the page:

FacesMessage facesMessage = new FacesMessage(FacesMessage.SEVERITY_INFO, "Mensagem", "Descrição");
FacesContext.getCurrentInstance().addMessage(null, facesMessage);

For more details, click here.

Answer 2

You can do this using Primefaces.

In your Selectonemenu you would have the following properties:

• a Property called required="true" that would say that the field is required.
• a Property called requiredMessade="Your message" where you would say which message you want to add.

Above your form would have a message field to be shown, which could be so:

<p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" />

On your button you would need to add the following properties:

• ajax="true" to validate using ajax.
• immediate="false" (if true it will not do screen validations)

Or if you don’t want to use the first faces, you could put a message using Faces after the click of the button on your Bean, in this way:

FacesMessage facesMessage = new FacesMessage(FacesMessage.SEVERITY_INFO, "Qual a mensagem", "O que dizer na mensagem");

Any questions you can check in the site itself:

http://www.primefaces.org/