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POdatatable pagination when using viewscoped bean
 

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  1. POdatatable pagination when using viewscoped bean
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    <p>I have been using <code>JSF 1.2</code> in my application. most of my application pages consists of <code>h:datatable</code>. I came across <a href="http://balusc.blogspot.sg/2006/06/using-datatables.html" rel="nofollow">this</a> wonderful article which explain everything about datatables. As shown in the above article, i implemented the datatable pagination by binding my table to <code>HtmlDataTable</code> and using a session scoped bean.</p> <p>Now i am moving to <code>JSF 2.0</code> version. I wanted to convert my <code>sessionscoped</code> beans to <code>viewscoped</code> as most of my application pages are independent from one another.</p> <p>i came across <a href="http://balusc.blogspot.sg/2010/06/benefits-and-pitfalls-of-viewscoped.html" rel="nofollow">this</a> article which explains about the <code>Viewscoped</code> beans. It tells that we cannot use <code>binding</code> attribute of the datatable. and also it uses the <code>Datamodel</code>.</p> <p>I am now struck on how to implement datatable pagination with the <code>Datamodel</code> and <code>viewscoped</code> bean.</p> <p>I am having the following methods for pagination</p> <pre><code>public String pageFirst() { dataTable.setFirst(0); return ""; } public String pagePrevious() { dataTable.setFirst(dataTable.getFirst() - dataTable.getRows()); return ""; } public String pageNext() { dataTable.setFirst(dataTable.getFirst() + dataTable.getRows()); return ""; } public String pageLast() { try { int count = dataTable.getRowCount(); int rows = dataTable.getRows(); LOGGER.info("rowcount:" + count); LOGGER.info("rows:" + rows); dataTable.setFirst(count - ((count % rows != 0) ? count % rows : rows)); }catch(ArithmeticException e){ LOGGER.info("no rows to display: ",e); } return ""; } </code></pre> <p>And in the view i am using them like this</p> <pre><code>&lt;h:commandButton value="#{msgs.footerbutton1}" action="#{bean.pageFirst}" disabled="#{bean.dataTable.first == 0}" /&gt; &lt;h:commandButton value="#{msgs.footerbutton2}" action="#{bean.pagePrevious}" disabled="#{bean.dataTable.first == 0}" /&gt; &lt;h:commandButton value="#{msgs.footerbutton3}" action="#{bean.pageNext}" disabled="#{bean.dataTable.first + bean.dataTable.rows &gt;= bean.dataTable.rowCount}" /&gt; &lt;h:commandButton value="#{msgs.footerbutton4}" action="#{bean.pageLast}" disabled="#{bean.dataTable.first + bean.dataTable.rows &gt;= bean.dataTable.rowCount}" /&gt; </code></pre> <p>Please help.</p>
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