How to populate indetermined states when loading on demand ajax/json

[Ali]

Hello, 

I am loading a large list with checkboxes, some of the nodes have several subnodes checked and the data is peristed in a database.

I am using on demand loading with ajax json calls.

I can set the checkbox to true or false, but is there a way to set it to indetermined?

[Veselin Tsvetanov]

Hello Ali,

I would suggest you to try the CheckboxTemplate approach, proposed in the following blog post. Note that the suggested implementation is for MVC HTML helper. It would be translated to the following JavaScript initialization:

$("#treeview").kendoTreeView({
    checkboxes: {
        checkChildren: true,
        template: "<input type='checkbox' name='checkedNodes' value='#= item.id #' #if(item.checked) { # checked # } if(item.indeterminate) { # data-indeterminate # } #/>"
    },
    dataSource: {
        transport: {
            read: {
                url: serviceRoot + "/Employees",
                dataType: "jsonp"
            }
        },
        schema: {
            model: {
                id: "EmployeeId",
                hasChildren: "HasEmployees"
            }
        }
    },
    dataTextField: "Name",
    dataBound: updateTree
});

Regards,
Veselin Tsvetanov
Telerik by Progress