Node controllers for hierarchical data structures

A computer program product for generating node controllers on at least one hierarchical data structure associated with a computer database to improve navigation on the computer database, comprising:

• one or more computer-readable storage devices and program instructions stored on at least one of the one or more tangible storage devices, the program instructions executable by a processor, the program instructions comprising:
• program instructions to generate a plurality of node controllers on the at least one hierarchical data structure;
• program instructions to determine whether at least one user action is received on a first node controller associated with the generated plurality of node controllers;
• program instructions to, in response to the determination that the at least one user action is received on the first node controller associated with the generated plurality of node controllers, filter out at least one node level associated with the at least one hierarchical data structure, and present the at least one hierarchical data structure without the filtered out at least one node level;
• program instructions to determine whether the at least one user action is received on a second node controller associated with the generated plurality of node controllers;
• program instructions to, in response to the determination that the at least one user action is received on the second node controller associated with the generated plurality of node controllers, filter out at least one sibling node associated with the at least one hierarchical data structure, and present the at least one hierarchical data structure without the filtered out at least one sibling node;
• program instructions to determine whether the at least one user action is received on a third node controller associated with the generated plurality of node controllers;
• program instructions to, in response to the determination that the at least one user action is received on the third node controller associated with the generated plurality of node controllers, reverse-collapse at least one first node level and filter out at least one second node level based on the reverse-collapsed at least one first node level, and present the at least one hierarchical data structure without the filtered out at least one second node level;
• and
• wherein the program instructions to present the at least one hierarchical data structure without the filtered out at least one node level, the program instructions to present the at least one hierarchical data structure without the filtered out at least one sibling node, and the program instructions to present the at least one hierarchical data structure without the filtered out at least one second node level comprises program instructions to present first data in the computer database at a closer distance to second data in the computer database than previously presented by the computer database to enable viewing of the first data and the second data simultaneously on a computer screen.