A client-server based project schedule management system comprises multiple editors accessible through a web browser to perform various scheduling tasks by members of a project. Client-executable code is generated by the server for the client, which is passed to the client along with schedule-related information for populating the respective editors. The client executes the server-generated code to display the respective editor with pertinent information populated therein, and to manage and maintain any new or updated information in response to user interactions with the editor. Rows of tasks are represented by corresponding objects, where editor elements are object attributes which are directly accessible by the respective objects. Database queries are generated by the server based on constant strings containing placeholders which are replaced with information used by the query.