I've the below input with required="true":
<p:inputText value="#{bean.value}" required="true">
<p:ajax event="change" listener="#{bean.change()}" />
</p:inputText>
When user changes the value, the listener is fired and I can access the changed value. When user empties the field, the listener is not fired and the empty value is not updating in my bean. I gather that this is caused by requried="true". I would like to update my bean with empty value and fire the listener anyway when the user empties the field. How can I achieve this?
You can just use expression language (EL) in the required attribute too. You can then just check if the main submit button of the form has been pressed. Imagine that your form has a "Save" button like below,
<p:inputText ... required="true">
<p:ajax ... />
</p:inputText>
...
<p:commandButton ... action="#{bean.save}" />
Then you can let the required attribute evaluate true only if the button is invoked. You can achieve that by referencing the component via binding and checking if its client ID is present in the HTTP request parameter map:
<p:inputText ... required="#{not empty param[save.clientId]}">
<p:ajax ... />
</p:inputText>
...
<p:commandButton binding="#{save}" ... action="#{bean.save}" />
Note that #{save} is as-is and may absolutely not be bound to a backing bean, and that the variable name must be unique in the current view and EL scope.
See also:
How to let validation depend on the pressed button?
The issue is that if the user clears the required input field then 'required' validator throws an exception and bean setter will not be called. When the form is reloaded then cleared value will show up again from the bean. Here is my workaround:
public String getSomething() {
return isFormValueEmpty("form:something") ? null : this.something;
}
private Boolean isFormValueEmpty(String formFieldName) {
ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
String formValue = ec.getRequestParameterMap().get(formFieldName);
logger.debug("Check if form value is empty: [{}] [{}]", formFieldName, formValue);
return StringUtils.isEmpty(formValue);
}
Related
I am validating a user entered account number using two validators, one for basic standard format, and the other that validates the account number against values stored in a database. The database of valid account numbers may not always be up to date so I want to allow the user to override and submit their entered account number but only after the database validation has failed. I always want to validate its standard format 8 characters with no spaces.
<h:form id="formId">
<p:panelGrid>
<p:row>
<p:column>
<p:outputLabel value="Account : " for="acct" />
</p:column>
<p:column>
<p:selectOneMenu id="acct" value="#{bean.acct.acctNum}" effect="fold" editable="true" validator="acctLengthAndSpaceValidator" required="true" requiredMessage="Required">
<f:selectItems value="#{bean.mySavedAccounts}" var="acct"
itemLabel="#{acct.acctNumber} itemValue="#{acct.acctNumber}" />
<o:validator validatorId="accountDatabaseValidator" disabled="#{bean.skipDbValidation}" />
</p:selectOneMenu>
</p:column>
<p:column>
<p:messages for="acct" showDetail="true" skipDetailIfEqualsSummary="true" />
</p:column>
</p:row>
</p:panelGrid>
<br />
<p:selectBooleanCheckbox rendered="#{facesContext.validationFailed}" value="#{bean.skipDbValidation}" itemLabel="I know this account is really valid, please skip validation and let me submit!">
<p:ajax update="#this" listener="#{bean.testListener()}" />
</p:selectBooleanCheckbox>
<p:commandButton value="Submit" action="#{bean.submit()}" update="formId"/>
</h:form>
The checkbox does appear after the form is initially submitted and has any validation failure (I will figure out how to isolate to just the failed accountDatabaseValidator). But then when I select the checkbox, and submit again, both validators are still fired. I added the ajax listener to debug, and it isn't firing and the boolean value skipDbValidation is still false.
Perhaps my approach is not correct in achieving my concrete goal of validating against the database but then giving the user the option of skipping the db validation after initial failure.
EDIT
if i remove rendered="#{facesContext.validationFailed}" from the checkbox and have it visible all the time, the boolean skipDbValidation will get set to true if the checkbox is checked and then on subsequent submit, the skipDbValidation is ignored as expected. But I do not want the checkbox allowing the user to bypass visible at first. Only after validation fails.
The technical explanation that this doesn't work is that the rendered attribute is re-evaluated during processing the form submit. At this point the faces context is not validationFailed anymore (it was only validationFailed during the previous request) and thus the component is not rendered anymore and then the component's submitted value won't be applied. This matches #6 of commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated.
Your work around by rendering it client-side rather than server-side is acceptable. But I gather that you wanted to show it only when the specific validator has been invoked. There are at least 2 ways to achieve this:
Check UIInput#isValid() of the input component of interest. You can achieve that by binding the component to the view (not to the bean!) via component's binding attribute so you can reference it elsewhere in the same view.
<p:selectOneMenu binding="#{acct}" ...>
...
</p:selectOneMenu>
...
<p:selectBooleanCheckbox styleClass="#{acct.valid ? 'ui-helper-hidden' : ''}" ...>
...
</p:selectBooleanCheckbox>
Note that I took the opportunity to reuse the PrimeFaces-provided style class.
Or, make the validator a view scoped bean and reference it via <o:validator binding> instead.
#Named
#ViewScoped
public class AccountDatabaseValidator implements Validator, Serializable {
private boolean validationFailed;
#Override
public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
// ...
validationFailed = !isValid(value);
if (validationFailed) {
throw new ValidatorException(createError("Invalid value"));
}
}
public boolean isValidationFailed() {
return validationFailed;
}
}
<p:selectOneMenu ...>
<o:validator binding="#{accountDatabaseValidator}" ... />
</p:selectOneMenu>
...
<p:selectBooleanCheckbox rendered="#{accountDatabaseValidator.validationFailed}" ...>
...
</p:selectBooleanCheckbox>
My work around to get the checkbox to programmatically display and so the checkbox would function was to hide and display using CSS instead of the render attribute.
style="#{facesContext.validationFailed ? 'Display: inline' : 'Display: none;'}"
<p:selectBooleanCheckbox style="#{facesContext.validationFailed ? 'Display: inline' : 'Display: none;'}" value="#{bean.skipDbValidation}" itemLabel="I know this account is really valid, please skip validation and let me submit!">
<p:ajax update="#this" />
</p:selectBooleanCheckbox>
But I still can't figure out how to display the checkbox for a specific validation failure.
I will post another question for that
EDIT
Here is how I ended up displaying the checkbox only after the Invalid Account validation failure.
<p:selectBooleanCheckbox style="#{facesContext.messageList.stream()
.anyMatch(v -> v.summary == 'Invalid Account') or
bean.skipDbValidation ? 'Display: inline' : 'Display: none;'}"
value="#{bean.skipDbValidation}" itemLabel="I know this account is really valid, please skip validation and let me submit!">
<p:ajax update="#this" />
</p:selectBooleanCheckbox>
I am using JSF with PrimeFaces with fields like below.
<p:outputLabel for="vehicle" value="#{msg['vehicle.text']}" />
<p:autoComplete id="vehicle" value="#{newCtrlr.vehicleId.vehicle}" autocomplete="true" scrollHeight = "200" required = "true"
completeMethod="#{newCtrlr.vehicle_AutoComplete}" minQueryLength = "2">
<p:ajax event="itemSelect" listener = "#{newCtrlr.onVehicleChange}" update = "market" />
<p:ajax event="change" listener = "#{newCtrlr.onVehicleChange}" update = "market" />
</p:autoComplete>
<p:outputLabel for="market" value="#{msg['market.text']}" />
<p:inputText id="market" value="#{newCtrlr.market.marketName}"
readonly = "#{empty newCtrlr.vehicleId.vehicle ? 'true' :'false' }" />
In the above code, if the vehicle value is entered, the market should be made editable. If the vehicle value is cleared, the market should become readonly. Now since the vehicle input is 'required', the ajax update is not triggered and so the market remains enabled. If I remove the 'required' on Vehicle, everything works fine. I would like to know if there is a way to make the inputText required as well as trigger the ajax update when the value is changed to empty/null in the required field.
First of all, this behavior is default JSF behavior: If the input in invalid, it is not written to the model.
So you have to change this behavior manually, for example with an Event-Listener.
Add the following method to your Backing-Bean:
public void setModelValueToNullIfValidationFailed(ComponentSystemEvent event) throws AbortProcessingException {
UIInput input = (UIInput) event.getComponent();
if (input.isValid()) {
return;
}
input.getValueExpression("value").setValue(FacesContext.getCurrentInstance().getELContext(), null);
}
This method checks if the validation of the component has failed. If so the model value is set to null.
Add f:event to your p:autoComplete:
<p:autoComplete ...>
...
<f:event type="postValidate" listener="#{newCtrlr.setModelValueToNullIfValidationFailed}" />
</p:autoComplete>
I'm using a radio component on which, when selecting an item I want to execute an action on backing bean (not navigate to an outcome page, but to perform some action and then update current page via Ajax). Problem is I can't get the backing bean value change listener action to execute
<h:form id="one-radio">
<p:selectOneRadio layout="grid"
valueChangeListener="#{myBean.selectRadioItem}" >
<p:ajax process="#this" update="#form" />
<f:selectItems value="#{myBean.radioOptions}" var="radio"
itemLabel="#{radio.name}" itemValue="#{radio.id}" >
</f:selectItems>
</p:selectOneRadio>
</h:form>
and the backing bean method...
public void selectRadioItem(ValueChangeEvent event) {
String[] selectedItems = (String[]) event.getNewValue();
//more...
}
is there something wrong in the code which I'm missing? I've used this same structure for select many check box which is working...
Rodrigo, there's a difference between valueChangeListener and a simple method call via ajax.
Check this answer by BalusC about the difference between valueChangeListener and <f:ajax>
To solve your problem, you could use the listener property of <p:ajax>.
OneRadio component is used to receive only one value, if you want to select a list of values, use SelectOneMenu
Try to do the following:
<p:selectOneRadio layout="grid" value="#{myBean.radioValue}">
<p:ajax process="#this" update="#form" listener="#{myBean.selectRadioItem}"/>
<f:selectItems value="#{myBean.radioOptions}" var="radio"
itemLabel="#{radio.name}" itemValue="#{radio.id}" >
</f:selectItems>
</p:selectOneRadio>
In the backbean, you can remove the event parameter, because the value of the OneRadio component now is a property, which I named as radioValue
String radioValue;
...
public void selectRadioItem() {
String selectedItem = this.radioValue;
//more...
}
I have an h:inputText, h:selectonemenu and commandbuton. Inputtext is mandatory field and I have defined it as immediate="true". Then I when I click the button I want to pass current value of selectonemenu to managed bean. But its passig null. How can I manage this validation so that it allows me to get the value of selectOneMenu in Managed bean..
My code is..
<h:inputText id="inputSome" required="true" requiredMessage="Pls enter something"/>
<h:message for="inputSome"></h:message>
<h:selectOneMenu id="recepients" value="#{controller.selected}" immediate="true">
<f:selectItem itemLabel="Select" itemValue=""/>
<f:selectItems value="#{controller.tempNameList1}"></f:selectItems>
</h:selectOneMenu>
<p:commandButton value="Add" action="#{controller.submit}"
immediate="true"/>
When you put immediate=true in the commandButton, then Invoke Application phase is directly executed skipping the phases after (and including) validations. So "applying model values" phase is also skipped and the properties of managed bean are remained uninitialized. This causes you passing null for the value of selectOneMenu. The solution is, you have to retrieve the value for selected property of the controller manually, like bellow:
Map<String, String> paramMap = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap();
for (String key : paramMap.keySet()) {
if (key.contains("recepients")) {
selected = Integer.parseInt(paramMap.get(key));
}
}
I have specific use case for JSF validation. For example I have an inputText field:
<p:inputText id="input" required="#{myBean.required}" value="#{myBean.value}" maxlength="20" disabled="#{myBean.disabled}">
<p:ajax event="blur" process="#this" update="name" listener="#{myBean.listener}"/>
</p:inputText>
Value of input is number (in some cases it can also be a string, because this is part of composite component, but problem is better described if we assume this is a number). This input is part of the form, at the end of form I have submit button:
<p:commandButton value="Save" actionListener="#{myBean.save}"/>
What are my requests:
When submit button is pressed all validation should be processed and this is OK, this works fine.
When blur event is fired on input field if field is not empty a number validation should be processed, and this is also OK. At the end I update field with id name with some value.
Now I have a problem. My third request is when input is empty validation on input should not be processed. This is special case in which I will clear field with id name. This is also case when i remove text which is already entered in input, remove focus from component (press TAB for example) and in that case AJAX request should also be processed and name input will also be cleared.
How I can disable validation of this input field in case when it is empty, and just for this ajax event?
Let the input's required attribute check if the save button is pressed or not (which can be identified by the presence of its client ID in the request parameter map).
<h:form>
<p:inputText ... required="#{not empty param[save.clientId] and myBean.required}" />
<p:commandButton binding="#{save}" ... />
</h:form>
(note: do not bind it to a bean property! the code is as-is)
This way it would only evaluate true when the save button is actually pressed.
Or, if you have problems with binding and/or don't have a problem hardcoding the button's client ID:
<h:form id="formId">
<p:inputText ... required="#{not empty param['formId:buttonId'] and myBean.required}" />
<p:commandButton id="buttonId" ... />
</h:form>
Just remove the required attribute as you accept the input if the input is empty. Then write a custom validator which accepts only empty input or numerical input.
<p:inputText id="input" value="#{myBean.value}" maxlength="20" disabled="#{myBean.disabled}" validator="customerNumericInputValidator"> <p:ajax event="blur" process="#this" update="name" listener="#{myBean.listener}"/> </p:inputText>
public class customerNumericInputValidator implements Validator {
#Override
public void validate(FacesContext facesContext, UIComponent uIComponent,
Object object) throws ValidatorException {
String number = (String) object;
number = Strings.nullToEmpty(number).trim();
//if the request is a full request then number can not be empty
if(!FacesContext.getCurrentInstance().isPostback() && Strings.isNullOrEmpty(number))
{
FacesMessage message = new FacesMessage();
message.setSummary(Messages.getMessage("error empty value"));
message.setSeverity(FacesMessage.SEVERITY_ERROR);
throw new ValidatorException(message);
}
if(!Strings.isNullOrEmpty(number))
{
if(!isNumber(number))
{
FacesMessage message = new FacesMessage();
message.setSummary(Messages.getMessage("error not numerical value"));
message.setSeverity(FacesMessage.SEVERITY_ERROR);
throw new ValidatorException(message);
}
}
}
}