Hi,
Getting Display tag to remember pagination and sorting is quite tricky.
DisplayTag maintains 4 parameters of the form: d-NNNNNNN-p, d-NNNNNNN-o,
d-NNNNNNN-n, d-NNNNNNN-s. You need to get your action bean to 'remember'
them.
Below are some codes sample, hope it solves your problem.
Regards,
Yee
--------- Action Bean ----------------------------------------------
@DefaultHandler
public Resolution view()
{
// retrieves the search criteria from HttpSession
search = getContext().getCurrent(KEY, search);
DisplayTagHelper dth = new DisplayTagHelper(TABLE_ID,
getContext().getRequest());
if (dth.isParametersExist()) {
DisplayTagHelper.Decode(getContext().getRequest(),
TABLE_ID, search,
WebConfig.getPageSize());
// logger.debug("d-1329491-p: {}",
getContext().getRequest().getParameter("d-1329491-p"));
// logger.debug("d-1329491-o: {}",
getContext().getRequest().getParameter("d-1329491-o"));
// logger.debug("d-1329491-n: {}",
getContext().getRequest().getParameter("d-1329491-n"));
// logger.debug("d-1329491-s: {}",
getContext().getRequest().getParameter("d-1329491-s"));
// logger.debug("----------");
} else {
// The DisplayTag parameters are not present, which
means that the user
navigates to this page
// from 'outside' (menu, back button etc).
// Attempt to restore the last search position from the
Search object
stored in httpSession
// and set DisplayTag to remember the page number and
sort column.
ForwardResolution resolution = new
ForwardResolution("/searchAnnualReturn.action");
resolution.addParameter(dth.getPageKey(),
search.getPageNumber());
resolution.addParameter(dth.getExtraKey(), "1");
if (search.getSortColumn() != null) {
resolution.addParameter(dth.getSortKey(),
search.getSortColumn());
resolution.addParameter(dth.getOrderKey(),
search.isAsc()? "1" : "2");
}
return resolution;
}
_search();
return new ForwardResolution(VIEW);
}
-------- Helper Class
----------------------------------------------------------------------
/**
* DisplayTag helper class for external sorting and paging.
*
* @author yee
*/
public class DisplayTagHelper
{
private ParamEncoder encoder;
private HttpServletRequest request;
/**
* Construction of this class requires the {...@code TableId} and {...@code
HttpServletRequest} object
* @param tableId the DisplayTag table id.
* @param req the HttpServletRequest
*/
public DisplayTagHelper(String tableId, HttpServletRequest req) {
this.encoder = new ParamEncoder(tableId);
this.request = req;
}
/**
* Gets the DisplayTag parameter key for sort column.
* The key is of the form "d-1329491-s".
* @return the DisplayTag parameter key for sort column
*/
public String getSortKey()
{
return encoder.encodeParameterName(PARAMETER_SORT);
}
/**
* Gets the DisplayTag parameter key for sort direction.
* The key is of the form "d-1329491-o".
* @return the DisplayTag parameter key for sort direction.
*/
public String getOrderKey()
{
return encoder.encodeParameterName(PARAMETER_ORDER);
}
/**
* Gets the DisplayTag parameter key for page number.
* The key is of the form "d-1329491-p".
* @return the parameter key for page number.
*/
public String getPageKey()
{
return encoder.encodeParameterName(PARAMETER_PAGE);
}
/**
* A DisplayTag extra parameter key of the form "d-1329491-n".
* This parameter is always of value "1". It is required for the up/down
arrow to show in sort column.
*/
public String getExtraKey()
{
return encoder.encodeParameterName("n");
}
/**
* Returns true if the DisplayTag parameters are present. The DisplayTag
parameters
* are added in links generated by DisplayTag for sort columns and
pagination (next/prev/first/last/1,2,3...).
* @return true
*/
public boolean isParametersExist()
{
return request.getParameter(getPageKey()) != null;
}
/**
* Static helper method for decoding the DisplayTag parameters into a
{...@code BaseSearch} object.
*
* @param request the {...@code HttpServletRequest} object
* @param tableId the DisplayTag table Id
* @param search the {...@code BaseSearch} object for receiving the decoded
values. The decoded values are placed in the {...@code startPosition,
pageNumber, sortColumn and asc} fields
* @param pageSize the pagesize, for calculating start position from the
page number.
*
* @see com.ssm.csi.biz.model.BaseSearch
*/
public static void Decode(HttpServletRequest req, String tableId,
BaseSearch search, int pageSize)
{
ParamEncoder encoder = new ParamEncoder(tableId);
if
(req.getParameter(encoder.encodeParameterName(PARAMETER_PAGE)) != null)
{
search.setSortColumn(req.getParameter(encoder.encodeParameterName(PARAMETER_SORT)));
search.setAsc("1".equals(req.getParameter(encoder.encodeParameterName(PARAMETER_ORDER))));
String pageNumber =
req.getParameter(encoder.encodeParameterName(PARAMETER_PAGE));
if (pageNumber == null) {
search.setPageNumber(1);
search.setStartPosition(0);
} else {
search.setPageNumber(Integer.valueOf(pageNumber));
search.setStartPosition((search.getPageNumber()
- 1) * pageSize);
}
search.setPageSize(pageSize);
}
}
}
----------------------------------------------
akahn wrote:
>
> I'm building a Stripes app. I have a "item list" page that displays a
> list of items in a DisplayTag table. I've added the ability to type into
> a text field and filter the contents of the table based on the item name.
>
> What I'm finding however, is that pagination and sorting don't seem to
> work once I've started to filter. This seems to be an issue others (on
> this forum and others) have had w/ DisplayTag and Ajax, and I've tried a
> couple of options over the last week, the most recent being AjaxAnywhere
> (http://ajaxanywhere.sourceforge.net/) -- It seems though, that nothing I
> do works and I need some guidance.
>
> I have an item_list.jsp containing the following:
>
> <%-- The filter field --%>
> <s:url var="url"
> beanclass="org.stripesbook.quickstart.action.ItemListActionBean"/>
> Item Filter: <input type="text" onkeyup="filterItems(this,
> '${url}');"/><br/>
>
> <%-- This tag is the one called by the JS filter to redraw the
> table --%>
> <div id="item_table">
> <%...@include file="/WEB-INF/jsp/parts/item_table.jsp" %>
> </div>
>
> Any suggestions on what I should be doing so I can maintain the same
> functionality but get the DisplayTags sorting and pagination to work
> properly?
>
> Thanks in advance.
>
--
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