Undo Redo Vector Edits in OpenLayers

OpenLayers has given a good platform for vector data rendering on web. OpenLayers library also allows vector data manipulation or edit. For making vector data editing more easy I have created a control to undo or redo the vector edits. In the example for undo redo,  I have added controls for undo and redo the vector edits done. The basic example of OpenLayers, modify features has been extended very easily to incorporate undo redo control with help of UndoRedo class.

In this implementation i.e UndoRedo class has two stacks for undo features and redo features. On any edit of vector feature I insert the feature in undo stack. Like if there is a update of the feature the old feature get inserted into undo stack. So on undo action the updated  feature is  moved out to redo stack and old feature is moved to layer. The only issue here is with delete feature, openlayers library on delete action does not remove the feature (as it is required to send that info to server on commit) but change the state to “Delete”. I have done a little modification on delete, I remove the feature from layer to undo stack. So at this stage if somebody commits, the deleted features would not be deleted from server. To over come this issue I’ll write a function that will move back the deleted features to layer with state  “Delete” and style {display:”none”}  so that deleted features could also be removed from server.  This function has to be triggered before commit i.e. on start event of save strategy. I’ll update this control with this function by that time please test undo redo control example and in case of any bug let me know.