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WebHierarchicalDataGrid: get_scrollTop() returns incorrect value

By , 08/02/2013 12:52 PM

Infragistics WebHierarchicalDataGrid has a neat client-side built-in function get_scrollTop() – it is used if at any point you need to retrieve current vertical scroll position of the grid (e.g. to use it in your own calculations to display something at a specific position on the grid – tooltip, help, additional info etc.)

Unfortunately the function has a bug: its value only set if user actually manually scrolls the grid: using mouse and scrollbar on the right, keyboard etc. If no scrolling user-interaction is involved and scroll position changes due to other means (e.g. displayed data size changes) – the function retains original value, throwing all your calculation out of whack. Continue reading 'WebHierarchicalDataGrid: get_scrollTop() returns incorrect value'»

ADO.NET DataTable: Change Column DataType after table is populated with data

By , 08/02/2013 10:44 AM

Sometimes there is a need to change DataType of ADO.NET DataTable column. If your table is populated as a result of some database operation – you don’t know in advance what type the columns will be. And by design you cannot change the type of the column after the table is populated. Conudrum. Catch 22. Tough luck.

But wait, there’s light at the end of the tunnel. You cannot change the type of the existing column, but you can create a new one. Continue reading 'ADO.NET DataTable: Change Column DataType after table is populated with data'»

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