I recently upgraded all of my former ExtJS code to utilize the updated 2.0 library. There are a lot of fantastic changes and additions here, but I did run into one or two snags. In a previous post I showed how to use Event Handlers and Item Renderers with the ColdFusion 8 Ajax implementation of the ExtJS 1.1.1 data grid. It works very similarly with a straight (non-CF) implementation, whereby I had defined an unbound column, in my ColumnModel, and applied a renderer to it so that an icon would appear with an onclick event attached to the cell click. It's a very straight forward process, that immediately broke with the 2.0 library. It took me a little bit of playing around, but I finally discovered what appears to be either a bug in the library, or a glitch in the documentation.
What made this column previously 'unbound' was the fact that no dataIndex was set to the column. It wasn't required. Acoording to the 2.0 documentation, the attribute is still supposed to be optional. However, when trying this with 2.0, I found that I would continually get an error. Only after duplicating my dataIndex (I applied my ID query column to the dataIndex, the same as my ID column), and then using the renderer to overwrite, did I finally get my working grid. It's a bit of a hack, but it did the job.
It's a small gotcha, but a gotcha none the less, so I wanted to let ya'll know. As I said before, there are some fantastic changes in the new 2.0 implementation, and already some nice plugins being developed by the community. Well worth taking a peek under the covers.