Invoke JSF managed bean action on page load

Question

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

User · Answer

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     lt h inputHidden  value    loginBean loginStatus    gt    and in your bean code   public void setLoginStatus String loginStatus        this loginStatus   loginStatus     public String getLoginStatus             Do your stuff here      return loginStatus

User · Answer

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 -   lt html xmlns f  http   java sun com jsf core  gt         lt f metadata gt             lt f event type  preRenderView  listener    myController onPageLoad    gt         lt  f metadata gt   lt  html gt    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     lt f metadata gt       lt f viewAction action    myController onPageLoad     gt   lt  f metadata gt

User · Answer

calling bean action from a  will be a good idea keep  attribute autoRun  true   example below   lt p remoteCommand autoRun  true  name  myRemoteCommand  action    bean action   partialSubmit  true  update   form    gt

User · Answer

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  lt f event type  preRenderView  gt  in case you intend to initialize based on  lt f viewParam gt  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    lt f metadata gt       lt f viewParam name  foo  value    bean foo     gt       lt f event type  preRenderView  listener    bean onload     gt   lt  f metadata gt      public void onload             Do your stuff here      JSF 2 2   Alternatively  use  lt f viewAction gt  in case you intend to initialize based on  lt f viewParam gt  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    lt f metadata gt       lt f viewParam name  foo  value    bean foo     gt       lt f viewAction action    bean onload     gt   lt  f metadata gt      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  lt f metadata gt    lt f viewParam gt  and  lt f viewAction gt  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

[jsf] Invoke JSF managed bean action on page load

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