Tomahawk DataTable Sort Question - where/how is Sort Coded?

Wed, 28 Dec 2005 13:27:49 -0800

Can someone please help me to understand how to configure or code a column sort for a Tomahawk datatable?  Specifically, I’m not clear on how or what sort method is called?  Do the Tomahawk components take care of the sort for me, or do I need to code the sort myself (and if so where)?

 

I think I have the JSP coded correctly:

<t:dataTable id="data" styleClass="scrollerTable"

var="providers"

value="#{searchproviders_bean.arrlist_providers}"

preserveDataModel="false"

rows="20"

sortColumn="#{searchproviders_bean.sortcolumn}"

sortAscending="#{searchproviders_bean.sortascending}"

preserveSort="true">                                 

                                                                                   

<h:column>

<f:facet name="header">

      <t:commandSortHeader columnName="id" arrow="true" immediate="false">

            h:outputText value="#{messages['sort_id']}" />

      </t:commandSortHeader>

</f:facet>

<h:outputText value="#{providers.id}" />

</h:column>

<h:column>

<f:facet name="header">

      <t:commandSortHeader columnName="category" arrow="true" immediate="false">

            <h:outputText value="#{messages['sort_category']}" />

      </t:commandSortHeader>

</f:facet>

<h:outputText value="#{providers.category}" />

</h:column>

</t:dataTable>

 

‘searchproviders_bean’  is the backing bean, and ‘arrlist_providers’ is an ArrayList.  The ArrayList is initially sorted when it is retrieved from the database.  After the data is retrieved, I disconnect from the database.  The data in the ArrayList will be read-only (will contain search results list – the data is not updateable.)   When the data is displayed to the user, I want them to be able to sort the data by clicking on the column headings.  

 

I have also added the ‘sortcolumn’ and ‘sortascending’ properties to the backing bean as strings with the appropriate getter/setter methods:

 

public class searchproviders_bean {

    private ArrayList arrlist_providers;

    private String sortcol;

    private String sortascending;

…..

 

 

The part where I am confused is how to implement the sort method.  I know that the ArrayList gets ‘wrapped’ by a DataModel object (though I only understand this at a high-level), but I’m not sure how to configure or code the sort?  Does the Tomahawk DataModel implement the sort or do I need to code the sort?  If I need to code the sort, can someone please help me to understand where to implement this method and provide any helpful code examples?

 

BTW, currently, the datatable is displaying, but when I click on the column headings, the data does not sort (but the arrows on the column header change directions.)  Also, I do have a datascroller connected to the datatable that is working correctly:

 

 

Thanks

Tom

 

 

 

 

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