Hi Pierpaolo,
i'm not sure what exactly you problem is, because you don't write how
you are adding your generated componets to the view tree. but maybe this
helps you:
The easyest way to render dynamic appication created components is
(imho) to have a panel with binding attribute in yout jsf page, and
create the UIPannel including all children in your Application. You need
to assign a unique id to each application generated component to avoid
dublicated id exceptions.
Simple exampe:
----- jsf ----------------------------
<h:panelGroup binding="#{testBean.panel}"/>
----- /jsf ---------------------------
----- java ---------------------------
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public UIPanel getPanel() {
if (panel == null) {
createPanel();
}
return panel;
}
public void setPanel(UIPanel panel) {
this.panel = panel;
}
private void createPanel() {
Application application =
FacesContext.getCurrentInstance().getApplication();
// componentType and rendererType taken from HtmlPanelGroupTag
panel = (UIPanel)
application.createComponent(HtmlPanelGroup.COMPONENT_TYPE);
panel.setRendererType("javax.faces.Group");
panel.setId("gen_panel");
// componentType and rendererType taken from HtmlOutputLabelTag
HtmlOutputLabel label = (HtmlOutputLabel)
application.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
label.setRendererType("javax.faces.Label");
label.setId("labelName");
label.setFor("form:name");
label.setValue("Name :");
panel.getChildren().add(label);
// componentType and rendererType taken from HtmlInputTextTag
HtmlInputText text = (HtmlInputText)
application.createComponent(HtmlInputText.COMPONENT_TYPE);
text.setRendererType("javax.faces.Text");
text.setId("name");
ValueBinding vb = application.createValueBinding("#{testBean.name}");
text.setValueBinding("value", vb);
panel.getChildren().add(text);
// componentType, rendererType and escape taken from VerbatimTag
UIOutput verbatim =
(UIOutput) application.createComponent("javax.faces.Output");
verbatim.setRendererType("javax.faces.Text");
verbatim.getAttributes().put("escape", Boolean.FALSE);
verbatim.setId("verbatimName");
verbatim.setValue("<BR>");
panel.getChildren().add(verbatim);
label = (HtmlOutputLabel)
application.createComponent(HtmlOutputLabel.COMPONENT_TYPE);
label.setRendererType("javax.faces.Label");
label.setId("labelAge");
label.setFor("form:age");
label.setValue("Age :");
panel.getChildren().add(label);
text = (HtmlInputText)
application.createComponent(HtmlInputText.COMPONENT_TYPE);
text.setRendererType("javax.faces.Text");
text.setId("age");
vb = application.createValueBinding("#{testBean.age}");
text.setValueBinding("value", vb);
panel.getChildren().add(text);
verbatim =
(UIOutput) application.createComponent("javax.faces.Output");
verbatim.setRendererType("javax.faces.Text");
verbatim.setId("verbatimAge");
verbatim.getAttributes().put("escape", Boolean.FALSE);
verbatim.setValue("<BR>");
panel.getChildren().add(verbatim);
}
----- /java ---------------------------
will create the same view as the following
----- jsf ----------------------------
<h:panelGroup >
<h:outputLabel for="form:name" value="Name :" />
<h:inputText id="name" value="#{testBean.name}"/>
<f:verbatim><br></f:verbatim>
<h:outputLabel for="form:age" value="Age :" />
<h:inputText id="age" value="#{testBean.age}"/>
<f:verbatim><br></f:verbatim>
</h:panelGroup>
----- /jsf ---------------------------
Regards,
Volker
Pierpaolo Follia wrote:
> Hi guys.
> This is not a MyFaces related problem, but a JSF related problem. Maybe
> someone here could help me.
> I'm writing a set of components for a new web application based on JSF.
> Among requisites there is the need to build some forms in a dynamic way:
> the application will sell products that will change in the future, and
> the request from our committee is that (only for some product) forms are
> to be auto-generated from a xml structure (or something similar) that
> can be built using product info stored into the database.
> Now my problem is this: I have created a jsf components that reads the
> xml and creates new inputs components using validations and conversions
> directly from the passed informations (using Shale and its validator
> tags I can add javascript validation too!). It's great, but I don't
> think it's the right approach to the problem, because I'm creating new
> components dynamically during the rendering phase of my component and I
> have to make them not transient to allow the lifecycle to be applied to
> my fresh created components. So, when the page is reloaded for some
> reason, I get a duplicate id error, 'cause I'm adding components in the
> view that I've already added before. I can check in some way if I have
> to add or not my new inputs, but for reasons I can't explain, it is not
> always possible for me to do this check.
> Where I'm wrong with this problem? Is my solution totally wrong or is
> there a way to safely add not transient components to my view without
> the duplicate id problem?
>
> Thanks.
>
> Regards,
> Pierpaolo
>
--
Don't answer to From: address!
Mail to this account are droped if not recieved via mailinglist.
To contact me direct create the mail address by
concatenating my forename to my senders domain.
