Versions Compared

Old Version 1

changes.mady.by.user Sergey Kiselev

Saved on

compared with

New Version Current

changes.mady.by.user Bill Bruyn

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Table of Contents

Description

ListGrid displays a list of objects in a grid, where each row represents one object and each cell in the row represents one property.

Periodical Periodically updating a ListGrid is possible in the following ways:

  • Use Using the invalidateCache method. It update This approach updates the data and will show a loading message and . However, this API will disrupt the existing view.
  • Transparent update by DataSource using the fetchData method. It update This method updates the data will not but doesn't show a loading message and will not won't disrupt the existing view.
Info

A working example is available in the attachment.

Transparent update

For transparent loading of the data the fetchData method should be used fetchData method.

final com.smartgwt.client.data.
Code Block
languagejava
titleUpdate by DataSource
linenumbers
true
private void onRefresh() {
    DataSource dataSource = listGrid.getDataSource();
com.smartgwt.client.data.
    Criteria criteria = listGrid.getCriteria();
dataSource.fetchData(criteria, new com.smartgwt.client.data.DSCallback() { Integer[] visibleRows = listGrid.getVisibleRows();
@Override    
	// publicrequest void execute(com.smartgwt.client.data.DSResponse response, Object rawData, com.smartgwt.client.data.DSRequest request) {
        com.smartgwt.client.data.ResultSet resultSet = new com.smartgwt.client.data.ResultSet(dataSource);
        resultSet.setInitialLength(response.getTotalRows())one page's worth of data on either side of the current viewport
    Integer startRow = visibleRows[0] - listGrid.getResultSet().getResultSize();
    Integer endRow = visibleRows[1] + resultSetlistGrid.setInitialDatagetResultSet(response).getDatagetResultSize());
    if (startRow   listGrid.setData(resultSet);
< 0) {
   } });

Transparent update range

For transparent loading the data range should be used DSRequest. It allows you to specify a range of data to load.

Code Block
titleUpdate by DataSource
 final com.smartgwt.client.data.DataSource dataSource startRow = listGrid.getDataSource()0;
com.smartgwt.client.data.Criteria criteria criteria = listGrid.getCriteria();
Integer[] visibleRows = listGrid.getVisibleRows();
Integer startRow = visibleRows[0];
Integer endRow = visibleRows[1];
com.smartgwt.client.data. }
    
	DSRequest request = new com.smartgwt.client.data.DSRequest();
int preloadSize = 10; request.setStartRow(((startRow);
-  preloadSize) < 0request.setEndRow(endRow);
?  0 : (startRow - preloadSizerequest.setSortBy(listGrid.getSort());
request.setEndRow(endRow  + preloadSize); 
	dataSource.fetchData(criteria, new com.smartgwt.client.data.DSCallback() {
        @Override
        public void execute(com.smartgwt.client.data.DSResponse response, Object rawData, com.smartgwt.client.data.DSRequest request) {
        com.smartgwt.client.data.ResultSet resultSet = new com.smartgwt.client.data.ResultSet(dataSource onRefreshed(response);
        resultSet.setInitialLength(response.getTotalRows());}
    }, request);
}

 com.smartgwt.client.data.Record[] records;
 private void onRefreshed(DSResponse response) {
    
	DataSource dataSource if= (responselistGrid.getStartRowgetDataSource();
== 0) {  ResultSet resultSet = new ResultSet(dataSource);
      records = resultSet.setInitialLength(response.getDatagetTotalRows());
    
	// correctly position the result } else {in the resultset's cache 
    Record[] result = response.getData();
    recordsRecord[] initialData = new com.smartgwt.client.data.Record[response.getTotalRows()];
  
         System.arraycopy(response.getData()result, 0, recordsinitialData, response.getStartRow(), responseresult.getData().length);
    resultSet.setInitialData(initialData);
   }
 
	resultSet.setInitialSort(listGrid.getSort());
       resultSet.setInitialData(records);
 resultSet.setCriteria(listGrid.getCriteria());
      listGrid.setData(resultSet);
    }
}, request);

Attachments

Attachments