Dhtmlx React Gantt

Source Of Truth

Use only:

1. The current project's files, structure, and established patterns
2. DHTMLX MCP for React Gantt API details: https://docs.dhtmlx.com/mcp
3. Official DHTMLX React Gantt docs as fallback: https://docs.dhtmlx.com/gantt/integrations/react/

Never invent props, hooks, templates, callback signatures, event names, or backend behavior.

If any React Gantt API detail is unclear, resolve it through DHTMLX MCP before writing code.

Preflight

Before writing code, identify:

• package: @dhtmlx/trial-react-gantt or @dhx/react-gantt — check package.json, imports, lockfiles
• runtime: React, Next.js (needs "use client"), Remix, or other React-based setup
• ownership model: React-managed (default) or Gantt-managed (large datasets, Gantt-centric app)
• persistence: local only, data.save (default, single-entity), or data.batchSave (bulk sync)

Workflow

1. Confirm the installed DHTMLX React Gantt package and import path.
2. Decide the data ownership model before implementing features.
3. Read only the reference file needed for the task:

• React integration/setup: [references/react-integration.md](references/react-integration.md)
• CRUD, state, persistence, wrapper task types, and v9 -> v10 migration: [references/data-and-crud.md](references/data-and-crud.md)
• Failure cases and guardrails: [references/known-failures.md](references/known-failures.md)
• Advanced patterns (reorder, resources, undo/redo, schema): [references/advanced-patterns.md](references/advanced-patterns.md)
• Styling, theming, CSS variables, selectors, and template-based visual customization: [references/styling-and-theming.md](references/styling-and-theming.md)

1. Use DHTMLX MCP before relying on advanced or unfamiliar APIs.
2. Implement with documented APIs only.

MCP Server

This skill relies on DHTMLX MCP for API verification. If the dhtmlx-mcp tool is not available, ask the user to add it:

Claude Code:

claude mcp add --transport http dhtmlx-mcp https://docs.dhtmlx.com/mcp

Codex:

codex mcp add dhtmlx-mcp --url https://docs.dhtmlx.com/mcp

If MCP is not available, use the official docs at https://docs.dhtmlx.com/gantt/integrations/react/ as fallback.

Consult MCP First For

Consult DHTMLX MCP before using or changing:

• template callbacks you have not already verified
• wrapper hooks such as useWorkTime, useGanttDatastore, or useResourceAssignments
• advanced props such as batchSave, inlineEditors, modals, customLightbox, or groupTasks
• theme names beyond the known project usage
• resource panel, calendars, or advanced layout details
• resource timeline templates and cell rendering callbacks
• workload cell templates and overload threshold logic

Hard Rules

• The Gantt container must have explicit height.
• Use the app theme as the single source of truth.
• Prefer CSS variables and documented templates before selector-heavy overrides.
• Normalize date values before persistence.
• Build backend payloads explicitly from normalized task/link models.
• Do not use undocumented internals when a documented prop, hook, or ref API exists.
• Do not mix React-managed props and imperative instance mutations unless synchronization is intentional.

Quick Checklist

• [ ] Correct package identified
• [ ] Matching CSS import used
• [ ] Explicit height provided
• [ ] Data ownership model chosen
• [ ] Dates normalized before persistence
• [ ] Advanced APIs verified with MCP

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: DHTMLX
• Source: DHTMLX/skills
• License: MIT

Install and usage instructions live in the source repository linked above.