Datatable-Pagination with <h:link> and Url-Parameters - jsf

Question

i am looking for a plain-jsf-solution to handle bookmarkable, parameterbased datatable-pagination.
actually i am using an ajax-approach and a cookie to store the active page. when the user hits F5 or clicks a link in a datatable-row and then returns with "browser-back", i check the cookie to show the last active page.
<h:commandLink value="Next Page">
<f:ajax listener="#{bean.nextPage}" render="dataTable"/>
</h:commandLink>
#ViewScoped
public class PagerBean {
public void nextPage() {
this.resultList = Products.getNextProducts(getFirstResult(),getMaxResult());
addCookie("activePage", getActivePage());
}
}
#ViewScoped
public class ProductBean {
#ManagedProperty(value="#{pager}")
protected PagerBean pager;
#Postconstruct
public void init() {
if (isCookie("activePage"){
pager.setActivePage(getCookie("activePage"));
}
}
}
however, i am looking for a bookmarkable solution, so that we can produce links with specific url-parameters, which are also trackable by browser back/forward-button.
http://foo.com/products?page=1
http://foo.com/products?page=2
http://foo.com/products?page=3
<h:link outcome="/pages/markets/products">
<f:param name="page" value="#{bean.pager.activePage}"/>
</h:link>
#ViewScoped
public class ProductBean {
#ManagedProperty(value="#{pager}")
protected PagerBean pager;
#Postconstruct
public void init() {
final String page = Faces.getRequestParameter("page");
if (null != page){
//load next entries
}
}
}
my only problem is, that with this version, the ViewScoped ProductBean gets newly created on every pagination-action. i think, as the view is not changing, the bean should not be re-created. what is the right approach to get lucky?

Answer 1

found a non-primefaces-solution using h:commandLink and HTML5 History API.
on every pagination-action the current pagenumber is stored in the history. when user navigates, the pagenumber will be restored from history and ajax-submitted again.
<h:commandLink value="Next Page">
<f:ajax listener="#{bean.nextPage}" render="dataTable" onevent="pushState"/>
</h:commandLink>
<h:inputText id="current" value="#{bean.pager.activePage}"/>
<h:commandLink value="Previous Page">
<f:ajax listener="#{bean.prevPage}" render="dataTable" onevent="pushState"/>
</h:commandLink>
<!--hidden action fired when user navigates in history-->
<h:commandLink styleClass="hidden" id="hiddenLink">
<f:ajax execute="current" listener="#{bean.jumpToPage}" render="dataTable" />
</h:commandLink>
JS:
$(window).on('popstate', function(event) {
var pageInHistory = event.originalEvent.state;
if (null == pageInHistory){
pageInHistory = 1;
}
//set page number from history
$('#current').val(pageInHistory);
//trigger ajax-submit
$('#hiddenLink').trigger('click');
});
pushState = function (data){
switch (data.status) {
case "success": {
var currentPage = $('#current').val();
history.pushState(currentPage, null, "?page=" + currentPage);
}
}
Bean
#ViewScoped
public class PagerBean {
private int activePage;
public void jumpToPage() {
//load data for activePage
}
//...
}