Isn't he talking about things which have inputs? Clearing the ID is just resetting a read-only parameter, which is a little different than UIInput components.
What I've been using is a method which recurses through a tree, checking if components are UIInputs. If they are, it just does component.setValue(null), and component.setSubmittedValue(null).
It seems like this would be a _very_ common thing for people to want to do, but I'm surprised I haven't found it or something similar in any documentation I have (including Kito's book)
-- Jon
On Apr 27, 2005, at 2:48 AM, CsÃk Norbert wrote:
Check out my clear button. In faces-config I have a navigation rule for the "clear" outcome: from page.jspx to page.jspx. It works for me.
public class PageBean { private String id; private String name;
public PageBean() { } public String save() { FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Saved.")); id = "15"; return "success"; } public String delete() { FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Deleted.")); return clear(); } public String clear() { id = ""; return "clear"; } public String editDetail() { FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Detail.")); return "success"; } public boolean isLoaded() { return getId() != null && !getId().equals(""); }
public String getId() {
return (id == null)
? (String)FacesContext.getCurrentInstance().getExternalContext().getReque stParameterMap().get("form:id")
: id
;
}
public void setId(String id) { this.id = id; }
public String getName() { return name; }
public void setName(String name) { this.name = name; } }
And the JSF page:
<?xml version='1.0' encoding='ISO-8859-2'?>
<jsp:root xmlns="http://www.w3.org/1999/xhtml";
xmlns:jsp="http://java.sun.com/JSP/Page"; version="2.0"
xmlns:f="http://java.sun.com/jsf/core";
xmlns:h="http://java.sun.com/jsf/html";>
<f:view>
<html>
<jsp:output omit-xml-declaration="false" doctype-root-element="html"
doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";
doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"/>
<jsp:directive.page contentType="text/html;charset=ISO-8859-2"/>
<head>
<meta http-equiv="Content-Type"
content="text/html; charset=ISO-8859-2"/>
<title>
Page
</title>
</head>
<body>
<h:form id="form">
<h:panelGrid columns="1">
<h:messages layout="table"/>
<h:panelGroup>
<h:commandButton value="New" action="#{PageBean.clear}"
immediate="true"/>
<h:commandButton value="Save" action="#{PageBean.save}"/>
<h:commandButton value="Delete" action="#{PageBean.delete}"
immediate="true" rendered="#{PageBean.loaded}"/>
</h:panelGroup>
<h:inputHidden id="id" value="#{PageBean.id}"/>
<h:panelGrid columns="2">
<h:outputLabel style="color:red" value="NÃv"/>
<h:inputText value="#{PageBean.name}" required="true"/>
<h:outputLabel value="ID"/>
<h:outputText value="#{PageBean.id}"/>
<h:outputLabel value="TÃpus"/>
<h:commandButton action="#{PageBean.editDetail}" value="Szerkeszt"
disabled="#{!PageBean.loaded}"/>
</h:panelGrid>
</h:panelGrid>
</h:form>
</body>
</html>
</f:view>
</jsp:root>
On 4/26/05, Vincent SEVEL <[EMAIL PROTECTED]> wrote:
Hi, I am trying to figure out the best/simplest way to reset a form whose
fields are associated with a backing bean. I have found one incomplete
solution and would like to hear from other people.
I have got a person.jsp, which contains:
à Input text bound to #{person.lastname}, required=true
à Input text bound to #{person.firstname}
à Button bound to #{personPage.console} that displays the content of
the form in the console
à Button bound to #{personPage.reset} that blanks out all the fields
from the form
1) Initially I just removed the "person" object from the request map and
returned null from the reset action. This caused the form to be reset, but
also an validation error message to be displayed on the next page about the
first field not being filled (ie: it is required).
2) Then, I set immediate='true' on the reset button, and rendered the
response directly from the reset action (ie:
FacesContext.getCurrentInstance().renderResponse()). Although this skipped
the validation phase, it did not repopulate the components from the value
binding expressions (ie: it does not blank out the form).
3) The only and last solution I can see at this time would be to
findComponent() the lastname & firstname fields, blank them out manually and
renderResponse() immediately. But this extremely tedious and error prone.
In short, I would like to deactivate validation and conversion for some
special actions, but still feed from the backing bean during the render
phase. Any ideas?
Thanks, source follows.
Vincent
person.jsp
<f:view>
<h:messages styleClass="error" layout="table" showDetail="true"
showSummary="false" tooltip="true"/>
<h:form>
Lastname: <h:inputText id="lastname" value="#{person.lastname}" required="true"/><p/>
Firstname: <h:inputText id="firstname" value="#{person.firstname}"/><p/>
<h:commandButton value="Console" action="#{personPage.console}"/>
<h:commandButton value="Reset" immediate="true"
action="#{personPage.reset}"/>
</h:form>
</f:view>
public class Person {
private String lastname;
private String firstname;
â
public class PersonPage {
private Map getRequestMap() {
return
FacesContext.getCurrentInstance().getExternalContext().getRequestMap() ;
}
public String console() {
Person person = (Person) getRequestMap().get("person");
System.out.println(person.getLastname()+" "+person.getFirstname());
return null;
}
public String reset() {
getRequestMap().remove("person");
FacesContext.getCurrentInstance().renderResponse(); // will skip the
validation and conversion phases, but will not refresh from the backing bean
return null;
}
}
-- CsÃk Norbert http://norbert.web.elte.hu/ ProgramtervezÅ matematikus Trilobita Informatikai Rt. - rendszertervezÅ fejlesztÅmÃrnÃk ___ keep sm:)ing _________________________ooo__C( O O )L__ooo__ http://www.aion.hu/ - A csik.NET otthona http://www.spreadfirefox.com/ - Rediscover the web LÃgy pontos: MÃrj mikro-millimÃterben! JelÃlj krÃtÃval! VÃgj baltÃval!
