How to submit null value of p:selectOneMenu?

Question

I have file submission.xhtml with code snippet:

<p:outputLabel for="cbFilterPlanYear" value="Choose time period"/>

<p:outputPanel>
    <p:selectOneMenu id="cbFilterPlanMonth" value="#{SubmissionController.miFilterMonth}" style="width: 50%">
        <f:selectItem itemLabel="#{null}" itemValue="#{null}" />
        <f:selectItems value="#{SubmissionController.mlistMonth}" var="month" itemValue="#{month}" itemLabel="#{month}" />
        <p:ajax event="change" update="@this" />
    </p:selectOneMenu>

    <p:selectOneMenu id="cbFilterPlanYear" value="#{SubmissionController.miFilterYear}" style="width: 50%">
        <f:selectItem itemLabel="#{null}" itemValue="#{null}" />
        <f:selectItems value="#{SubmissionController.mlistYear}" var="year" itemValue="#{year}" itemLabel="#{year}" />
        <p:ajax event="change" update="@this" />
    </p:selectOneMenu>
</p:outputPanel>

These line of code for search criteria(s), for filter data. I can't submit NULL value (As you know, it also don't set specific criteria to search query). Help me submit null value from p:selectOneMenu.

why you can't submit null value? if you no select any value in the select, your field in managedbean will be null — pedrohreis, May 23 '16 at 02:30
It can't send `null` value. It keep old value, for example, if I choose May month before, it keep value `5`, don't change to `null`, when I submit. — Vy Do, May 23 '16 at 02:32
really, see the @inafalcao's answer. i think `noSelectionOption="true"` fix your problem — pedrohreis, May 23 '16 at 02:42

inafalcao · Answer 1 · 2016-05-23T02:54:04.077

0

I think you could put just an empty string on your f:selectItem instead of itemLabel="#{null}" itemValue="#{null}" and add the attribute noSelectionOption="true"

<f:selectItem itemLabel="" itemValue="" noSelectionOption="true" />

Example here on primefaces docs.

edited May 23 '16 at 02:54

answered May 23 '16 at 02:38

inafalcao

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has no problem in use `itemLabel="#{null}"` and `itemValue="#{null}"` But, I think that `noSelectionOption="true"` fix the problem – pedrohreis May 23 '16 at 02:41
I have no way to test this, but at least the empty string is less verbose, I think. :) – inafalcao May 23 '16 at 02:50
When I choose null value, It doesn't work, even it doesn't call method at controller when I press submit button. – Vy Do May 23 '16 at 02:53
If the value of the selectOneMenu is a string there's no difference. However, it can be a object of another class – pedrohreis May 23 '16 at 02:53
1

In either case, edited my answer to put this as an enhancement. – inafalcao May 23 '16 at 02:55
@dovy, paste the snippet of your submit button – pedrohreis May 23 '16 at 03:02
Instead of posting a "try this" / "I think" answer, please first try to reproduce the described problem yourself and test the potential solution yourself. If you're unable to, post a comment instead of an answer. At least, the `noSelectionOption` serves an entirely different purpose than what you're saying here: http://stackoverflow.com/questions/11360030/best-way-to-add-a-nothing-selected-option-to-a-selectonemenu-in-jsf – BalusC May 23 '16 at 07:31

score -1 · Answer 2 · answered May 23 '16 at 02:57

-1

you can do like that :<f:selectItem itemValue="#{null}" itemLabel="" />

answered May 23 '16 at 02:57

sawyinwaimon

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When I choose `null` month or `null` year, even it doesn't call method `search(...)` at controller. – Vy Do May 23 '16 at 03:02
`public final void search() { try { mlistSubmission = msubmissionModel.search(strSearchSubmitNo, miFilterYear, strSearchSubmitType, mfilterOrg.getOrgCode(), miFilterMonth); } catch (Exception ex) { SystemLogger.getLogger().error(ex); ClientMessage.logErr(ClientMessage.MESSAGE_TYPE.ERR, ex.toString()); } }` – Vy Do May 23 '16 at 03:07

How to submit null value of p:selectOneMenu?

2 Answers2