URL and query parameters

Canvas Gantt URLs and Redmine saved queries can share supported view conditions. Browser-only personal preferences are not included unless a parameter explicitly represents them.

State precedence

Canvas Gantt resolves a view in this order:

1. Explicit URL parameters
2. The visible saved Redmine query identified by query_id
3. The last query state saved in localStorage for the current project and browser profile
4. Defaults

The saved query is the base condition. Explicit URL filters override matching fields.

Canvas URL parameters

Parameter	Meaning
query_id	Use a visible saved query as the base condition
status_ids[]	Status IDs
assigned_to_ids[]	Assignee IDs; use none for unassigned
canvas_project_ids[]	Explicitly selected project IDs; see Project scope below for visibility limits. none explicitly selects zero projects
project_id	Redmine issue-list filter input: use with set_filter=1, f[]=project_id, op[project_id], and v[project_id][]. Use canvas_project_ids[] for Canvas project scope
project_ids[]	Backward-compatible input; Canvas Gantt does not generate it
fixed_version_ids[]	Target-version IDs; use none for no version
tracker_ids[]	Tracker IDs
group_by	project, assigned_to, or none
sort	Frontend key and direction, such as subject:asc
c[]	Visible columns; compatible with Redmine c[]
show_subprojects	0 hides them; omitted or 1 shows them

Redmine issue-list compatibility

Supported parameters are set_filter=1, f[], op[field], v[field][], c[], group_by, and sort. Supported fields are status_id, assigned_to_id, project_id, fixed_version_id, tracker_id, and subproject_id. tracker_id supports = and *; Canvas URLs use tracker_ids[].

Field	Supported operators
status_id	=, *, o, c
assigned_to_id	=, *, !*
project_id, fixed_version_id, tracker_id	=, *
subproject_id	*, !*

Unsupported fields and operators are ignored with a warning. A specific assignee combined with unassigned cannot be represented exactly when exported back to a standard Redmine URL, so the unassigned part is omitted. No-version is supported in Canvas URLs but omitted when exporting to Redmine. The default sort may also be omitted on export.

State that is not shared

Subject text and workload focus filters are personal browser state. Zoom, viewport, row height, sidebar width, and font size are also browser display preferences tied to the same profile.

Examples

/projects/demo/canvas_gantt?query_id=12
/projects/demo/canvas_gantt?query_id=12&status_ids[]=1&assigned_to_ids[]=5
/projects/demo/canvas_gantt?canvas_project_ids[]=3&fixed_version_ids[]=7&group_by=project
/projects/demo/canvas_gantt?assigned_to_ids[]=none&show_subprojects=0

The projects, issues, and saved queries a user can open remain subject to Redmine visibility and permissions.

Project scope

By default, project candidates remain within the opened project's tree. The Member projects only filter uses visible active projects where the user has direct or group membership; administrators get all visible active projects. Closed and archived projects are excluded.

Projects outside the opened tree do not contribute issues until explicitly selected in the Canvas project filter. Visible, editable issues in explicitly selected external projects support the same scheduling actions, subject to normal Redmine issue permissions. Relations across project trees also follow Redmine's cross_project_issue_relations setting.