GWT Datagrid does not show data , but contains it

Question

I\'m trying to convert a cellTable into adatagrid, because I want to add a search handler later and therefor I need fixed column headers. At the mo

Answer 1

DataGrid requires to be put in a LayoutPanel or Panel that implements the ProvidesResize interface to be visible. ScrollPanel implements that interface.

Furthermore this chain of LayoutPanels from your DataGrid up to your root element/panel has to be unbroken. That seems to be the case in your panel hierarchy.

Finally you have to use the RootLayoutPanel instead of the RootPanel to add your LayoutPanels. So did you make sure that you add your SimpleLayoutPanel to the RootLayoutPanel ?

Also refer to this GWT: DataGrid - set height 100% not rendering properly

Answer 2

Here are my 2 cents.

When it comes to render a DataGrid outside of a properly formed "LayoutPanel or Panel that implements the ProvidesResize" tree structure, I found out I always need to keep the following in mind:

1. As this question explains, the height DataGrid property needs an explicit value, for example, "123px". Without this, DataGrid does not show its data rows (even if they are in the DOM).

2. If put a DataGrid inside an unfocused DecoratedTabPanel tab, DataGrid.redraw() needs to be called when such tab gets focus . Again, without this, DataGrid does not show its data rows (even if they are in the DOM).

I hope this helps.

Answer 3

In my case it was caused by this: DataGrid rows not visible in second tab of TabLayoutPanel