i have page my.xhtml:
<f:metadata>
<f:viewParam name="id"/>
</f:metadata>
...
<h:form>
Current id is: "#{id}"
<h:commandButton action="#{bean.doSomething}" value="Do some logic..">
<f:param name="id" value="#{id}"/>
</h:commandButton>
</h:form>
and Bean.java:
#ManagedBean
#ViewScoped
public class Bean {
....
public void doSomething(){
//do some logick, don't use id parameter
}
}
When I get to page first time with id=10 I can see on page Current id is: "10"..
When I click on button page is reload and I can see on page Current id is: "10". again.
But when I click on button third time I can see on page Current id is: ""., i lose id parameter and I don't understand why?
I know I can do this with save parameter value in bean
(by add to f:viewParam:
<f:metadata>
<f:viewParam name="id" value="#{bean.value}/>
</f:metadata>
), but can I do this without save parameter value in bean?
h:button works with f:param but h:commandButton does not. In this case, your best is to bind the view parameter to a bean property as you explain the last. The #ViewScoped bean will retain its state as long as you call void action methods.
You could also pass it as a parameter to the action method (there are several ways to do that), but this doesn't make sense for a method which has nothing to do with that value.
See also:
Passing parameters to action methods in JSF
Communication in JSF
Related
I have a product.xhtml and a ProductBean. I use /product/{id} to access the products so I have a viewParam in product.xhtml with value=ProductBean.id. The problem is that inside the bean I use an init function with a PostConstruct annotation in order to fill the details of the product. To do this I need the id to call an external function. I guess though that init is called before viewParam sets the id of the bean and therefore inside init I cannot call the external function because id is not set yet. What am I doing wrong and how do I fix this?
UPDATE
I found what was wrong. I think the viewParam method works with CDI beans but the ManagedProperty method works with JSF beans..
I do have one other problem now. My CDI bean is RequestScoped and when the product.xhtml is rendered the bean is created and I guess is later discarded. The funny thing is that I have a function inside that bean which when I call, I can read the id (which I assume this happens because is connected to the view param) but not any other properties. Any ideas how to fix this?
You need a <f:event type="preRenderView"> instead.
<f:metadata>
<f:viewParam name="foo" value="#{bean.foo}" />
<f:event type="preRenderView" listener="#{bean.onload}" />
</f:metadata>
With
public void onload() {
// ...
}
Note that this is in essence a little hack. The upcoming JSF 2.2 will offer a new and more sensible tag for the sole purpose: the <f:viewAction>.
<f:metadata>
<f:viewParam name="foo" value="#{bean.foo}" />
<f:viewAction action="#{bean.onload}" />
</f:metadata>
See also:
ViewParam vs #ManagedProperty(value = "#{param.id}")
Communication in JSF 2.0 - Processing GET request parameters
Is there a way to execute a JSF managed bean action when a page is loaded?
If that's relevant, I'm currently using JSF 1.2.
JSF 1.0 / 1.1
Just put the desired logic in the constructor of the request scoped bean associated with the JSF page.
public Bean() {
// Do your stuff here.
}
JSF 1.2 / 2.x
Use #PostConstruct annotated method on a request or view scoped bean. It will be executed after construction and initialization/setting of all managed properties and injected dependencies.
#PostConstruct
public void init() {
// Do your stuff here.
}
This is strongly recommended over constructor in case you're using a bean management framework which uses proxies, such as CDI, because the constructor may not be called at the times you'd expect it.
JSF 2.0 / 2.1
Alternatively, use <f:event type="preRenderView"> in case you intend to initialize based on <f:viewParam> too, or when the bean is put in a broader scope than the view scope (which in turn indicates a design problem, but that aside). Otherwise, a #PostConstruct is perfectly fine too.
<f:metadata>
<f:viewParam name="foo" value="#{bean.foo}" />
<f:event type="preRenderView" listener="#{bean.onload}" />
</f:metadata>
public void onload() {
// Do your stuff here.
}
JSF 2.2+
Alternatively, use <f:viewAction> in case you intend to initialize based on <f:viewParam> too, or when the bean is put in a broader scope than the view scope (which in turn indicates a design problem, but that aside). Otherwise, a #PostConstruct is perfectly fine too.
<f:metadata>
<f:viewParam name="foo" value="#{bean.foo}" />
<f:viewAction action="#{bean.onload}" />
</f:metadata>
public void onload() {
// Do your stuff here.
}
Note that this can return a String navigation case if necessary. It will be interpreted as a redirect (so you do not need a ?faces-redirect=true here).
public String onload() {
// Do your stuff here.
// ...
return "some.xhtml";
}
See also:
How do I process GET query string URL parameters in backing bean on page load?
What can <f:metadata>, <f:viewParam> and <f:viewAction> be used for?
How to invoke a JSF managed bean on a HTML DOM event using native JavaScript? - in case you're actually interested in executing a bean action method during HTML DOM load event, not during page load.
Another easy way is to use fire the method before the view is rendered. This is better than postConstruct because for sessionScope, postConstruct will fire only once every session. This will fire every time the page is loaded. This is ofcourse only for JSF 2.0 and not for JSF 1.2.
This is how to do it -
<html xmlns:f="http://java.sun.com/jsf/core">
<f:metadata>
<f:event type="preRenderView" listener="#{myController.onPageLoad}"/>
</f:metadata>
</html>
And in the myController.java
public void onPageLoad(){
// Do something
}
EDIT - Though this is not a solution for the question on this page, I add this just for people using higher versions of JSF.
JSF 2.2 has a new feature which performs this task using viewAction.
<f:metadata>
<f:viewAction action="#{myController.onPageLoad}" />
</f:metadata>
#PostConstruct is run ONCE in first when Bean Created.
the solution is create a Unused property and Do your Action in Getter method of this property
and add this property to your .xhtml file like this :
<h:inputHidden value="#{loginBean.loginStatus}"/>
and in your bean code:
public void setLoginStatus(String loginStatus) {
this.loginStatus = loginStatus;
}
public String getLoginStatus() {
// Do your stuff here.
return loginStatus;
}
Calling bean action from a <p:remoteCommand> will be a good idea, keep attribute autoRun="true"
Example below
<p:remoteCommand autoRun="true" name="myRemoteCommand" action="#{bean.action}" partialSubmit="true" update=":form" />
I have a ViewScoped Managed Bean. In my .xhtml page I want to set bean's attribute's value and use it in methods in the same bean.
I managed to set the value from jsf page, but when i want to use it in some method the value of an attribute is not the value i have set before.
Description (xhtml):
In this form there is a command link which sets the value of an attribute. And it is working fine. Also, as command link is clicked, second form is being showed.
<h:form>
<h:commandLink value="Set" >
<f:setPropertyActionListener target="#{bean.attribute}" value="true" />
<f:ajax execute="#this" />
</h:commandLink>
</h:form>
This form executes method that uses attribute's value set before, but the value is not true, its false.
<h:form>
<h:commandButton id="submit" value="Execute" action="#{bean.execute}" />
</h:form>
Bean:
public void execute(){
if(isAttribute())
---do something---
}
The question is: Why execute() is not reading attribute's value right?
When I use one form, it's working fine. But I need them to be in separated forms.
The scope of your bean is incorrect. ViewScoped means that the minute the view is changed, the bean is discarded and re-created for the next view. So, in your case, the original data you had for the first view is lost.
I'm going to refer you to BalusC's blog:
http://balusc.blogspot.co.uk/2010/06/benefits-and-pitfalls-of-viewscoped.html
which states:
A #ViewScoped bean will live as long as you're submitting the form to the same view again and again. In other words, as long as when the action method(s) returns null or even void, the bean will be there in the next request. Once you navigate to a different view, then the bean will be trashed
I can't determine of you stay on the same page with both requests. If you do, viewScope should work even in two different forms. If you are navigating from 1 view to another, another viewScope will be created and you will loose the current one.
You could set the value in the sessionScope with java or by annotating the backingNean. But then everything in your backingBean becomes sessionScoped and that might not be needed.
You could also use a spring-like flow scope.
Example to do it with java:
public void callThisAfterFirstClick() {
Faces.setSessionAttribute(attribute, true)
}
public void callThisAfterSecondClick() {
Faces.getSessionAttribute(attribute);
}
f:param works great with h:link, but not with p:commandLink or h:commandLink.
For example, I have two pages test_first.xhtml and test_second.xhtml, and a backing java bean TestBean.java.
I start running test_first.xhtml.
If I click link1, which is a h:link, the page will redirect to test_second.xhtml. With the help of f:param, the address bar of the browser will show .../test_second.xhtml?id=1. On that page, testBean.userId gets printed.
If I click link2 or link3, the page redirects to test_second.xhtml. However, the address bar only shows .../test_second.xhtml, there is NO ?id=#! And testBean.userId does not get printed on that page.
How can I make commandLink work with f:param? Sometimes I want the link not to redirect to another page but to call some methods of bean depending on the data.
test_first.xhtml:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<h:head/>
<h:body>
<h:form>
<h:link value="link1" outcome="test_second" >
<f:param name="id" value="1"/>
</h:link>
<br/><br/>
<h:commandLink value="link2" action="test_second?faces-redirect=true" >
<f:param name="id" value="2" />
</h:commandLink>
<br/><br/>
<p:commandLink value="link3" action="test_second?faces-redirect=true">
<f:param name="id" value="3" />
</p:commandLink>
<br/><br/>
</h:form>
</h:body>
</html>
test_second.xhtml:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:p="http://primefaces.org/ui">
<f:metadata>
<f:viewParam name="id" value="#{testBean.userId}" />
</f:metadata>
<h:head/>
<h:body>
<h:form>
This is the second page.
<h:outputText value="Selected id is #{testBean.userId}" />
<h:commandButton value="Print page id" action="#{testBean.print()}" />
</h:form>
</h:body>
</html>
TestBean.java
#ManagedBean
#SessionScoped
public class TestBean implements Serializable{
private Integer userId;
public void print() {
System.out.println(userId);
}
public Integer getUserId() {
return userId;
}
public void setUserId(Integer userId) {
this.userId = userId;
}
}
You misinterpreted the meaning of those two tags, namely <h:link> and <h:commandLink>, therefore, you also misinterpreted the meaning of <f:param> attached to either of the two. In anycase it is worthwhile to always read the documentation before asking the questions to get more insight.
<h:link> renders an HTML "a" anchor element. The value of the component is rendered as the anchor text and the outcome of the component is used to determine the target URL rendered in the "href" attribute. Any child UIParameter components are appended to the String to be output as the value of the "href" attribute as query parameters before rendering...
<h:commandLink> render an HTML "a" anchor element that acts like a form submit button* when clicked ... if the disabled attribute is not present, or its value is false. It renders "#" as the value of the "href" attribute, renders the current value of the component as the link text if it is specified and *renders JavaScript that is functionally equivalent to the following as the value of the "onclick" attribute:
document.forms['CLIENT_ID']['hiddenFieldName'].value='CLIENT_ID';
document.forms['CLIENT_ID']['PARAM1_NAME'].value='PARAM1_VALUE';
document.forms['CLIENT_ID']['PARAM2_NAME'].value='PARAM2_VALUE'; return false;
document.forms['CLIENT_ID'].submit()"
where hiddenFieldName is as described above, CLIENT_ID is the clientId of the UICommand component, PARAM_NAME and PARAM_VALUE are the names and values, respectively, of any nested UIParameter children.
In other words, within <h:link> tag nested <f:param> will end up as a query parameter of the generated URL, while within <h:commandLink> tag nested <f:param> will end up as a request parameter with a given value.
While the first one is clear, the second one deserves a better elaboration. To understand what it does, consider that if we abstract away from the details <h:commandLink> sends a POST request and attaches all nested <f:param> tags as request parameters. But it is up to you how you will handle them, as navigation is entirely in your hands.
So, the first option is to set a hardcoded action attribute, which use case is dubious, like in action="second-page", in which way you didn't pass any query parameter at all. What will be done is POSTing to the same view and forwarding to the second without undertaking any action. Quite a dumb action.
The second option is to specify an action method, like in action="#{bean.action}". In this case you must handle navigation in the provided action method, i.e. return null/void from the method for a postback, or return a navigation case outcome as a string to make a forward to the specified view. As for the request parameters that you passed with <f:param> they will be available with standard JSF means like #ManagedProperty("#{param.name}") on a request-scoped bean, or by calling ExternalContext#getRequestParameterMap() in any-scoped bean, for example, in action method, like in String param = externalContext.getRequestParameterMap().get("name"). So now you have your parameter in action method that you're free to use how you like, just adhere to a set of rules that exist for URLs.
Two things left worth mentioning. Remember that request parameters passed with calling the command link will be available only within that same request, as you might expect it to survive a faces-redirect=true that basically fires another request. The other option is to specify includeviewparams=true to pass through the paramaters of the current view, if that's desired, as mentioned in the other answer.
You could do it by concatenating the parameters with & directly at the action attribute:
<p:commandLink value="link3" action="test_second?faces-redirect=true&id=3"/>
Update 1
You might also consider to add &includeViewParams=true. This way view parameters of your target navigation will be included automatically.
I have 3 pages:
main.xhtml
agreement.xhtml
generated.xhtml
The agreement.xhtml needs two parameters to load correctly: serviceId and site. So, a normal url looks like this: /app/agreement.xhtml?site=US&serviceId=AABBCC.
I have this button on agreement.xhtml
<h:form>
<h:commandButton value="Generate License File" action="#{agreement.generateMethod}" />
</h:form>
The #RequestScoped bean #{agreement} has this method:
public String generateMethod(){
.......
return "generated";
}
I need that, on click, the generateMethod() method is executed, and after it's done, the user is redirected to the generated.xhtml page. What's happening is that, on click, the page browser sends the user to /app/agreement.xhtml and, since it's not sending the parameters site and serviceId, it crashes.
I tried making the generateMethod() return a "generated?faces-redirect=true", but still nothing. Any ideas?
Your concrete problem is caused because a JSF <h:form> submits by default to the current request URL without any query string. Look closer at the generated HTML output, you'll see
<form action="/app/agreement.xhtml" ...>
You'd thus explicitly need to include those request parameters yourself. There are several ways to solve this. If you weren't sending a redirect, then you could just add them as hidden inputs to the JSF form.
<h:form>
<input type="hidden" name="site" value="#{param.site}" />
<input type="hidden" name="serviceId" value="#{param.serviceId}" />
...
</h:form>
Only, those parameters won't reappear in URL in browser's address bar. This isn't a problem if you're only using using ajax on the same page. The <h:inputHidden> is by the way not suitable as it will confusingly lose its value when a conversion or validation error occurs on the form.
In order to get them to reappear in URL, you need <f:viewParam> and includeViewParams. In order to get includeViewParams to work, you need to declare the following in both the source page agreement.xhtml ...
<f:metadata>
<f:viewParam name="site" value="#{agreement.site}" />
<f:viewParam name="serviceId" value="#{agreement.serviceId}" />
</f:metadata>
... and the target page generated.xhtml:
<f:metadata>
<f:viewParam name="site" value="#{generated.site}" />
<f:viewParam name="serviceId" value="#{generated.serviceId}" />
</f:metadata>
Now you can send a redirect including the view parameters as follows:
public String generateMethod() {
// ...
return "generated?faces-redirect=true&includeViewParams=true";
}
Do note that the bean should be #ViewScoped in order to keep those parameters alive between opening the page with the form and submitting the form, also on validation errors. Otherwise, when sticking to a #RequestScoped bean, you should be retaining them as <f:param> in the command components:
<h:commandButton ...>
<f:param name="site" value="#{generated.site}" />
<f:param name="serviceId" value="#{generated.serviceId}" />
</h:commandButton>
There's no way to set them for <f:ajax> inside input components, your bean should then really be #ViewScoped.
Alternatively, if you happen to use JSF utility library OmniFaces already, then you could also just replace the <h:form> by <o:form> as follows (see also showcase example):
<o:form>
That's basically all. This will generate a <form action> with current query string included.
<form action="/app/agreement.xhtml?site=US&serviceId=AABBCC" ...>
Those request parameters are then just available in the request parameter map of the form submit. You don't need additional metadata/viewparams and you also don't need to send a redirect and your bean can be kept #RequestScoped, if necessary.
public String generateMethod() {
// ...
return "generated";
}
See also:
What can <f:metadata>, <f:viewParam> and <f:viewAction> be used for?
How to navigate in JSF? How to make URL reflect current page (and not previous one)
Your generateMethod would have to return
return "generated?site=US&serviceId=AABBCC&faces-redirect=true";
You can even replace & with & but escape it in your xhtml.
In your generated.xhtml you can catch the parameters that are being passed with <f:viewParam> like this
<f:metadata>
<f:viewParam name="site" value="#{yourBean.site}"/><!--Make sure you have a setter-->
<f:viewParam name="serviceId" value="#{yourBean.serviceId}"/><!--Make sure you have a setter-
</f:metadata>
<h:head>