HierarchicalDataSource, how to re-fetch data

[Iwhp]

By using a HierarchicalDataSource, the first time a node is expanded, the data is fetch from the data source.
The next time, the data is not retrieved from the data source.
How can one define, that on each expand, the data should be fetched from the data source?

[Alex Gyoshev]

Hello Harry,

Set the loaded flag of the datasource Node to false.

Regards,
Alex Gyoshev
the Telerik team

[Iwhp]

Thankx! I tried the following:

treeview.bind("expand", function (e) {
    e.node.loaded(false);
});

but the .loaded function is not defined here. Are there other options?

[Alex Gyoshev]

Hello Harry,

The loaded function is part of the HierarchicalDataSource Node object (rather than of the DOM object of the treeview node):

// get the Node object (model)
var dataItem = this.dataItem(e.node);
dataItem.loaded(false);

Kind regards,
Alex Gyoshev
the Telerik team

[Iwhp]

Thankx a lot, it is getting the data now.

So one small issue remains on my side:

BUG: the visual indicator, that the data is fetched from the data source, is not shown the second time.
Workaround: When I collapse the parent above the one which should be fetched and then open the child, then the indicator is shown.

[Alex Gyoshev]

Hello Harry,

We have made some improvements in the next internal build, which should be available in a few hours. Please try it out and see if the bug persists.

Greetings,
Alex Gyoshev
the Telerik team

[Greg]

Finally found what I needed...thank you for this information!