f:viewParam lost after ajax call

1
votes

I have this f:viewParam to set value and do search in back bean in view:

<f:metadata>
<f:viewParam name="id"
    value="#{editorBean.id}"
    required="true" />
<f:event type="preRenderComponent"
    listener="#{editorBean.search}" />
...

Back bean:

private String id; // getters setters

public void search(ComponentSystemEvent event) {


    if (id != null) {
            //search data in DB to construct TreeNode finBy(id)...
...

In browser I can't expand the second level of tree, because in backing Bean the id is null..

enter image description here

Debug:

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How to f:viewParam be set in all calls?

1
jsfviewparams

1 Answers

3
votes

It's caused because the <h:form> submits by default to an URL without the query string.

Either put the bean in the view scope,

@ManagedBean
@ViewScoped
public class EditorBean {

and skip the prerenderview during postback

public void search(ComponentSystemEvent event) {   
    if (FacesContext.getCurrentInstance().isPostback()) {
        return;
    }

    // ...
}

A view scoped bean lives as long as you interact with the same view and thus the properties doesn't need to be initialized again and again.

Or make use of OmniFaces <o:form> which offers an includeViewParams attribute to include view parameters in form action URL:

<o:form includeViewParams="true">

See also: