TreeGrid and datasource: No items to show

Question

I want to make a treegrid, I followed this sample :

http://www.smartclient.com/smartgwt/showcase/#featured_tree_grid

No compilation errors, but the tree is always empty: The message is : No items to show. where should I place the datasource.xml? I am using eclipse, jboss and smartgwt

Answer 1

You need to use a client only DataSource with the required .xml file.

datasource.xml Based on the sample:

<List>  
    <employee>  
        <EmployeeId>4</EmployeeId>  
        <Name>Charles Madigen</Name>  
        <Job>Chief Operating Officer</Job>  
    </employee>  
    <employee>  
        <EmployeeId>192</EmployeeId>  
        <Name>Ralph Brogan</Name>  
        <Job>Mgr Software Client Supp</Job>  
    </employee>  
</List>  

Place the datasource.xml in an accessible place in your web application.

http://<host>:<port>/testApp/data/datasource.xml

DataSource class:

public class EmployeeXmlDS extends DataSource {  

    public EmployeeXmlDS(String id) {

        setRecordXPath("/List/employee"); // <== set proper XPath based on data

        // other initialization and DataSourceField creation

        setDataURL("data/datasource.xml"); // <== set Data URL based on above location
        setClientOnly(true);
    }
}

Create tree grid:

TreeGrid treeGrid = new TreeGrid();
// treeGrid.set* and other methods

TreeGridField nameField = new TreeGridField("Name", 150);
TreeGridField jobField = new TreeGridField("Job", 150);

treeGrid.setFields(nameField, jobField);

EmployeeXmlDS employeesDS = EmployeeXmlDS.getInstance();
treeGrid.setDataSource(employeesDS); // <== set the data source

NOTE: Only important sections of the code is listed above.

Its also possible to manually add nodes to the tree.
http://www.smartclient.com/smartgwt/showcase/#tree_checkbox
http://www.smartclient.com/smartgwt/showcase/#tree_interaction_drag_reparent

In SmartGWT showcase, when 'View Source' is selected, there could be multiple files related to the sample.
If there are multiple files, they will be listed as tabs, along with main source file.