Can anyone explain why h:inputText must have required="true" when setting the property in controller and updating with ajax(See example below)?
Does not work:
<h:inputText id="textFieldId" value="#{model.itemValue}">
Works:
<h:inputText id="textFieldId" value="#{model.itemValue}" required="true">
Action:
<p:commandLink value="edit">
<p:ajax event="click" listener="#{controller.edit(item)}" process="#this" update="#form"/>
</p:commandLink>
Idea behind is that I want to press button for item and be able to edit so I need to propagate this item to inputText.
I dont see any reason for having required set to true.
Thanks
The PrimeFaces p:commandLink is by default already ajax enabled, so there is no need to nest a p:ajax tag inside it.
<p:commandLink value="edit" actionListener="#{controller.edit(item)}"
process="#this" update="#form"/>
But keep in mind that if you add a process="#this", the input is not processed on the server, just the commandLink. If the 'item' field is passed correctly in this case is unclear to me.
Related
I have created form and I want to show previous existing items on a table while a new one is creating. I'd like to show matching items as form is filling up. But when I try to filter the list without having the form completed, the validation messages appear and the table doesn't get updated.
Don't know if it's possible, but what I want to do something like this:
<h:form id="form">
<h:outputText value="Name: "/>
<p:inputText value="#{itemsBean.name}" id="name" required="true"/>
<br/>
<h:outputText value="Description: "/>
<p:inputText value="#{itemsBean.description}" id="description" required="true"/>
<p:commandButton value="Save" update="form" actionListener="#{itemsBean.save}"/> //validate and save
<p:commandButton value="Filter" update="form" actionListener="#{itemsBean.updateItemsList}"/> //don't validate, and update the table.
<p:dataTable id="list" value="#{itemsBean.itemsList}" var="item">
<p:column>
<h:outputText value="#{item.name}"/>
</p:column>
<p:column>
<h:outputText value="#{item.description}"/>
</p:column>
</p:dataTable>
</h:form>
I'm very new to JSF.
I understand that you want to filter based on the name input field. The <p:commandButton> sends by default an ajax request and has a process attribute wherein you can specify which components you'd like to process during the submit. In your particular case, you should then process only the name input field and the current button (so that its action will be invoked).
<p:commandButton process="#this name" ... />
The process attribute can take a space separated collection of (relative) client IDs of the components, wherein #this refers to the current component. It defaults in case of <p:commandButton> to #form (which covers all input fields of the current form and the pressed button), that's why they were all been validated in your initial attempt. In the above example, all other input fields won't be processed (and thus also not validated).
If you however intend to skip the required validation for all fields whenever the button in question is been pressed, so that you can eventually process multiple fields which doesn't necessarily need to be all filled in, then you need to make the required="true" a conditional instead which checks if the button is been pressed or not. For example, let it evaluate true only when the save button has been pressed:
<p:inputText ... required="#{not empty param[save.clientId]}" />
...
<p:inputText ... required="#{not empty param[save.clientId]}" />
...
<p:commandButton binding="#{save}" value="Save" ... />
This way it won't be validated as required="true" when a different button is pressed. The trick in the above example is that the name of the pressed button (which is essentially the client ID) is been sent as request parameter and that you could just check its presence in the request parameter map.
See also:
Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
I Have tested this with non-ajax submits:
<p:inputText ... required="#{not empty param.includeInSave1}" />
...
<p:inputText ... required="true" />
...
<p:commandButton value="Save1" ajax="false">
<f:param name="includeInSave1" value="true" />
</p:commandButton>
<p:commandButton value="Save2" ajax="false" />
The first input is required validated only on Save1 button submit.
Additionally to the BalusC answer (very useful and complete) I want to add that when you use a <h:commandButton /> it will validate (required, custom validations) all the fields in the <h:form /> where the command button is located, therefore when you need to use more than one command button you could consider that it is a good practice to use different <h:form /> to different responsibilities to avoid unexpected behavior in submit actions of the command buttons.
It is well explained in a BalusC answer: Multiple h:form in a JSF Page
If your form has validations and you do not update the <h:form /> or you do not show messages, you could get a headache thinking that the <h:commandButton /> is not firing your action, but likely is a validation problem that has not been shown.
Change your filter commandbutton like this to ignore validation:
<p:commandButton value="Filter" update="list" actionListener="#{itemsBean.updateItemsList}" process="#this"/>
EDIT:
The related post on SO, I think this will solve your issue too
JSF 2.0: How to skip JSR-303 bean validation?
I have created form and I want to show previous existing items on a table while a new one is creating. I'd like to show matching items as form is filling up. But when I try to filter the list without having the form completed, the validation messages appear and the table doesn't get updated.
Don't know if it's possible, but what I want to do something like this:
<h:form id="form">
<h:outputText value="Name: "/>
<p:inputText value="#{itemsBean.name}" id="name" required="true"/>
<br/>
<h:outputText value="Description: "/>
<p:inputText value="#{itemsBean.description}" id="description" required="true"/>
<p:commandButton value="Save" update="form" actionListener="#{itemsBean.save}"/> //validate and save
<p:commandButton value="Filter" update="form" actionListener="#{itemsBean.updateItemsList}"/> //don't validate, and update the table.
<p:dataTable id="list" value="#{itemsBean.itemsList}" var="item">
<p:column>
<h:outputText value="#{item.name}"/>
</p:column>
<p:column>
<h:outputText value="#{item.description}"/>
</p:column>
</p:dataTable>
</h:form>
I'm very new to JSF.
I understand that you want to filter based on the name input field. The <p:commandButton> sends by default an ajax request and has a process attribute wherein you can specify which components you'd like to process during the submit. In your particular case, you should then process only the name input field and the current button (so that its action will be invoked).
<p:commandButton process="#this name" ... />
The process attribute can take a space separated collection of (relative) client IDs of the components, wherein #this refers to the current component. It defaults in case of <p:commandButton> to #form (which covers all input fields of the current form and the pressed button), that's why they were all been validated in your initial attempt. In the above example, all other input fields won't be processed (and thus also not validated).
If you however intend to skip the required validation for all fields whenever the button in question is been pressed, so that you can eventually process multiple fields which doesn't necessarily need to be all filled in, then you need to make the required="true" a conditional instead which checks if the button is been pressed or not. For example, let it evaluate true only when the save button has been pressed:
<p:inputText ... required="#{not empty param[save.clientId]}" />
...
<p:inputText ... required="#{not empty param[save.clientId]}" />
...
<p:commandButton binding="#{save}" value="Save" ... />
This way it won't be validated as required="true" when a different button is pressed. The trick in the above example is that the name of the pressed button (which is essentially the client ID) is been sent as request parameter and that you could just check its presence in the request parameter map.
See also:
Understanding PrimeFaces process/update and JSF f:ajax execute/render attributes
I Have tested this with non-ajax submits:
<p:inputText ... required="#{not empty param.includeInSave1}" />
...
<p:inputText ... required="true" />
...
<p:commandButton value="Save1" ajax="false">
<f:param name="includeInSave1" value="true" />
</p:commandButton>
<p:commandButton value="Save2" ajax="false" />
The first input is required validated only on Save1 button submit.
Additionally to the BalusC answer (very useful and complete) I want to add that when you use a <h:commandButton /> it will validate (required, custom validations) all the fields in the <h:form /> where the command button is located, therefore when you need to use more than one command button you could consider that it is a good practice to use different <h:form /> to different responsibilities to avoid unexpected behavior in submit actions of the command buttons.
It is well explained in a BalusC answer: Multiple h:form in a JSF Page
If your form has validations and you do not update the <h:form /> or you do not show messages, you could get a headache thinking that the <h:commandButton /> is not firing your action, but likely is a validation problem that has not been shown.
Change your filter commandbutton like this to ignore validation:
<p:commandButton value="Filter" update="list" actionListener="#{itemsBean.updateItemsList}" process="#this"/>
EDIT:
The related post on SO, I think this will solve your issue too
JSF 2.0: How to skip JSR-303 bean validation?
<p:inputText value="#{bmiCalculatorBean.height}" update="#form" id="height">
<p:ajax update="#form" />
<f:convertNumber pattern="0" />
</p:inputText>
<p:inputText value="#{bmiCalculatorBean.weight}" update="#form" id="weight">
<p:ajax update="#form" />
<f:convertNumber pattern="0" />
</p:inputText>
I have a problem where after I enter a value into the first inputText and click on the "weight" inputText after a short delay the focus is lost and you need to click on the input box again.
How do I fix this?
This is caused by update="#form" and expected behavior.
In general, just do not update parts which do not need to be updated and update only those which really need to be updated. E.g. only the result calculated so far and the <h|p:message> of the current input:
<p:ajax update="calculatedResult currentInput_message" />
True, this may end up in a boilerplate of IDs in update attribute in large forms. The PrimeFaces Selectors (PFS, supporting jQuery selector syntax in JSF selectors) may then help a lot in this.
I am trying to pass a parameter to an ajax event, this is an example of what I mean:
<h:panelGrid id="pictures" columns="3">
<c:forEach items="#{createProduct.pictures}" var="picture">
<h:graphicImage value="#{picture.source}" />
<h:inputText value="#{picture.alt}" />
<p:commandButton value="Remove">
<f:ajax execute="#form"
listener="#{createProduct.removePicture(picture)}"
render="#form" />
</p:commandButton>
</c:forEach>
</h:panelGrid>
I know this code won't work because you cannot pass a parameter through the ajax listener. Though this is merely an example of what I am trying to accomplish. I have tried using <f:param id="picture" value="#{picture}" /> allong with the ajax tag, though this results in a duplicate component ID form:picture since it is in a loop.
I need this parameter inside the method in order to determine which picture to remove.
How can I solve this with ajax?
I am using a #ViewScoped CDI-bean.
First, I suggest replacing c:forEach with ui:repeat tag. Second, as you are using Primefaces, you should use all its strength. So, commandButton can be more easily written:
<p:commandButton value="Remove" process="#form" update="#form" action="#{createProduct.removePicture(picture)}"/>
and that's it. Don't complicate.
By the way, primefaces commandButton is sends AJAX request by default, you don't need (and you must not use) f:ajax tag.
I have a Facelets view as below:
<h:form id="f1">
<p:panelGrid id="p1" columns="2">
<p: inputText value="Distance Travelled::/><p:inputText value="#{airTransportUsage.distance}" immediate="true"
required="true" requiredMessage="Distance Travelled Field cannot be left blank.."
converterMessage="Distance Travelled must be a number"
validatorMessage="Distance Travelled must be a valid number.."
id="dis">
<f:validateLongRange minimum="1"/>
</p:inputText>
<p:commandButton value="Reset" action="#{airTransportUsage.reset}" update=":f1:p1" />
</p:panelGrid>
</h:form>
When the reset button is clicked, the corresponding method can never be executed due to validation. I can't use immediate="true" on my reset button as it creates some other problems.
The <p:commandButton> processes indeed by default the entire form (process="#form"), you can change this by specifying only the current component in the process attribute.
<p:commandButton value="Reset" ... process="#this" />
However, this will fail if the form is already been validated beforehand. The input fields which have been marked invalid won't be updated with the new model value (which you've resetted yourself). If you're using PrimeFaces 3.4, then embed <p:resetInput> in the button:
<p:commandButton value="Reset" ... process="#this">
<p:resetInput target="#form" />
</p:commandButton>
If you aren't on PrimeFaces 3.4 yet and can't upgrade to it, you can use OmniFaces ResetInputAjaxActionListener for this.
A completely different alternative is to just refresh the current page by a fresh new GET request.
<p:button value="Reset" />
This worked for me in PrimeFaces 5.3
<p:commandButton action="#{bean.reset()}" value="Reset" process="#this" update="#form" resetValues="true" />
You can probably replace the "#form" target of the update attribute to a specific component if you want.