How to get rid of empty tooltips while displaying error messages on tooltips in PrimeFaces?

问题

I display error messages somewhere on <p:tooltip> as follows.

<p:inputText id="text" value="#{bean.text}" required="true"/>

<p:tooltip for="text">
    <p:message for="text"/>
</p:tooltip>

Although it displays an error message the given tooltip, an empty/unnecessary tooltip is shown, when there is no error as can be seen in the following picture - beside the bottom right corner of the text box.

How to get rid of such empty tooltips? (I tried someway but it did not work)

回答1:

It can be done by checking for an error message in the list java.util.List<FacesMessage> that can be obtained by using facesContext.messageList.

The rendered attribute of <p:tooltip> can be set based on the error message/s found in the list for the associated component/s something along the line.

rendered="#{not empty facesContext.getMessageList('clientId')}"

A working code snippet :

<h:form id="form">
    <p:panel id="panel">
        <p:inputText id="text" value="#{bean.text}" required="true"/>

        <p:tooltip for="text" rendered="#{not empty facesContext.getMessageList('form:text')}">
            <p:message for="text"/>
        </p:tooltip>

        <p:commandButton value="Submit" update="panel"/>
    </p:panel>
</h:form>

---

Or by using component binding. Such as,

<p:inputText id="text" binding="#{inputComponent}" value="#{bean.text}"/>

<p:tooltip for="text" rendered="#{not empty facesContext.getMessageList(inputComponent.clientId)}">
    <p:message for="text"/>
</p:tooltip>

Or even

<p:inputText id="text" binding="#{inputComponent}" value="#{bean.text}"/>

<p:tooltip for="text" rendered="#{not inputComponent.valid}">
    <p:message for="text"/>
</p:tooltip>

The last two cases are useful especially when the (input) component is enclosed within an iterating component like a <p/h:dataTable>, <p:dataGrid>, <p:dataList> (or even <ui:repeat>) where the uniqueness of enclosing components is determined based on the iterating row index of an iterating component such as, form:dataTable:0:text, form:dataTable:1:text, form:dataTable:2:text... and so on

回答2:

p:tooltip should have a "rendered" attribute, set it to false

from documentation:

rendered : default=TRUE - value to specify the rendering of the component, when set to false component will not be rendered.

Source: http://courses.coreservlets.com/Course-Materials/pdf/jsf/primefaces/users-guide/p-tooltip.pdf

来源：https://stackoverflow.com/questions/25145363/how-to-get-rid-of-empty-tooltips-while-displaying-error-messages-on-tooltips-in