I am working on an application where i use a grid and have a combobox outside the grid whose selections are based on the selected rows within the grid. Basically the content of the combobox is dynamically updated based on the selection of rows. I’ve tried many ways of going about solving this problem since as usual i started getting Javascript errors in IE6. I first thought and tried to override the onTriggerClick function of the combobox, but i kept getting this bug where the first click on the trigger did not display the return list of values, but instead displayed a very thin blue box, and any subsequent click would then actually load the store and display the values correctly. Unable to find a solution i gave up on this approach and then tried to use the expand event to reload the combobox’s store. There i also encountered a bug where i would get an “Object is undefined” error in IE while clicking to trigger the combobox. I then did some research on the Sencha forum and then tried moving my code inside the beforequery event listener of the combobox. This worked like a charm.

For code example and a more detailed explanation, check the thread on the Sencha forum:

http://www.sencha.com/forum/showthread.php?119029-Reloading-a-Combobox-using-onTriggerClick&p=552445#post552445