React Gantt Chart with Drag and Drop: Complete Tutorial for 2026

A Gantt chart without drag-and-drop is a static picture. You can see the plan, but you can't change it. The moment a project manager wants to move a task, adjust a deadline, or link two tasks together, they're back in a form, editing dates manually. The chart updates, but the interaction is clunky and slow.

Drag-and-drop is what makes a Gantt chart feel like a tool instead of a report. Users grab a task bar, slide it to a new date, and the chart responds instantly. They drag from one task to another to create a dependency. They resize a bar to change duration. The project plan becomes something they manipulate directly, not something they fill out in a form.

Auto-scheduling takes this further. When a task moves, dependent tasks shift automatically to maintain the dependency chain. Move a design phase two days later, and the development phase that depends on it moves two days later too. The critical path updates. The project stays coherent.

In this tutorial, I'll walk through building an interactive React Gantt chart with drag-and-drop and auto-scheduling using SVAR React Gantt. I'll cover setup, rendering tasks and dependencies, enabling drag-and-drop, and configuring auto-scheduling. If you're still choosing a library, our React Gantt chart library guide compares the options. This post is the hands-on implementation.

Why SVAR React Gantt for This Tutorial

I'm using SVAR React Gantt for three reasons. First, it's a native React component—not a wrapper around a vanilla JavaScript library—which means it integrates cleanly with React's rendering model and TypeScript. Second, it supports drag-and-drop and dependencies out of the box in the free, open-source core. Third, the PRO edition adds auto-scheduling, which is the feature we want to demonstrate.

If you're building with a commercial library like DHTMLX or Bryntum, the concepts are similar, but the API differs. The DHTMLX auto-scheduling demo uses a configuration object with auto_scheduling: true and critical_path: true[reference:0]. SVAR's approach is more integrated with the React component model, which is why it's a good fit for a React tutorial.

Step 1: Install and Set Up

Start with a new or existing React project. Install the SVAR Gantt package:

npm install @svar-ui/react-gantt

Import the component and the CSS in your app:

import { Gantt } from "@svar-ui/react-gantt";
import "@svar-ui/react-gantt/all.css";

The basic Gantt component accepts tasks and links props. Here's a minimal example with two tasks and a dependency:

import { Gantt } from "@svar-ui/react-gantt";
import "@svar-ui/react-gantt/all.css";

export default function App() {
  const tasks = [
    {
      id: 1,
      text: "Design phase",
      start: new Date(2026, 10, 1),
      end: new Date(2026, 10, 5),
      duration: 5,
      progress: 0.4,
      type: "task",
    },
    {
      id: 2,
      text: "Development phase",
      start: new Date(2026, 10, 6),
      end: new Date(2026, 10, 15),
      duration: 10,
      progress: 0,
      type: "task",
    },
  ];

  const links = [{ id: "link-1", source: 1, target: 2, type: "e2e" }];

  return <Gantt tasks={tasks} links={links} />;
}

The type: 'e2e' link means "end-to-end" (finish-to-start), which is the most common dependency type. When the design phase ends, the development phase can begin. SVAR supports other link types as well, but e2e is the standard for most project plans.

Step 2: Enable Drag-and-Drop

The Gantt component supports drag-and-drop by default for task bars. Users can drag a task horizontally to change its start and end dates, or drag the edges to resize the duration. The onTaskChange event fires when a drag operation completes, giving you the updated task data.

function App() {
  const [tasks, setTasks] = useState(initialTasks);

  const handleTaskChange = (updatedTask) => {
    setTasks((prev) =>
      prev.map((t) => (t.id === updatedTask.id ? updatedTask : t)),
    );
    // Persist to your backend here
  };

  return <Gantt tasks={tasks} links={links} onTaskChange={handleTaskChange} />;
}

The drag interaction is smooth and visual—the task bar follows the cursor, and the timeline updates as you drag. This is the core interaction that makes a Gantt chart feel responsive.

Step 3: Create Dependencies by Dragging

SVAR Gantt also supports creating dependencies by dragging from one task to another. The exact interaction depends on the configuration, but the component provides onLinkChange events that you can use to persist new links.

const handleLinkChange = (updatedLink) => {
  setLinks((prev) => {
    const exists = prev.find((l) => l.id === updatedLink.id);
    if (exists) {
      return prev.map((l) => (l.id === updatedLink.id ? updatedLink : l));
    }
    return [...prev, updatedLink];
  });
};

Users can drag from the endpoint of one task to another to create a dependency, and the chart renders the arrow. This is a much faster workflow than opening a form and selecting a task from a dropdown.

Step 4: Enable Auto-Scheduling (PRO Edition)

Auto-scheduling is the feature that makes a Gantt chart truly dynamic. When a task is moved, any tasks that depend on it shift automatically to maintain the dependency relationship. This requires the PRO edition of SVAR Gantt.

In the PRO edition, you enable auto-scheduling through the component configuration:

import { Gantt } from "@svar-ui/react-gantt";

<Gantt
  tasks={tasks}
  links={links}
  autoSchedule={true}
  onTaskChange={handleTaskChange}
/>;

With auto-scheduling enabled, moving the "Design phase" task forward automatically shifts the "Development phase" task if it has an e2e dependency on the design phase. The dependency chain is preserved without manual intervention.

The PRO edition also supports critical path visualization, which highlights the sequence of tasks that determine the project's minimum duration. For project management dashboards, this is a valuable feature—it tells the project manager which tasks cannot slip without delaying the entire project.

If you're not ready to commit to a commercial license, DHTMLX Gantt offers auto-scheduling as a plugin, and there are open-source alternatives like @bluemillstudio/gantt that advertise auto-scheduling along with drag-and-drop and critical path analysis[reference:1].

Step 5: Customize the Timeline

A Gantt chart needs a readable timeline. SVAR Gantt supports configurable time scales—hours, days, weeks, months, or custom units like sprints. You define the scales array to control what appears in the header.

const scales = [
  { unit: "month", step: 1, format: "%F %Y" },
  { unit: "week", step: 1, format: "W%W" },
  { unit: "day", step: 1, format: "%j" },
];

<Gantt tasks={tasks} links={links} scales={scales} />;

You can also customize the grid columns on the left side—task name, start date, duration, progress, or any custom field. The grid and the timeline are synchronized, so scrolling one scrolls the other.

Common Pitfalls and How to Avoid Them

Forgetting to handle onTaskChange. Drag-and-drop is visual, but without persisting the change to state or your backend, the task will snap back to its original position on the next render. Always wire up the change handler.

Assuming auto-scheduling is free. SVAR Gantt's auto-scheduling is a PRO feature. If you're using the free core, you'll need to implement the scheduling logic yourself or choose a different library. DHTMLX and Bryntum both offer auto-scheduling in their commercial editions.

Not validating dependency cycles. If users can create dependencies by dragging, they can also create circular dependencies (Task A depends on Task B, which depends on Task A). Your application should detect and reject cycles. Auto-scheduling libraries often handle this, but it's worth testing explicitly.

Rendering too many tasks without virtualization. A Gantt chart with thousands of tasks needs virtualization to stay responsive. SVAR Gantt handles large datasets efficiently, but if you're using a different library, check its performance characteristics. Our React charting library for large datasets guide covers the general strategies.

Ignoring accessibility. Drag-and-drop is a mouse-centric interaction. Keyboard users need an alternative—typically a form or a keyboard shortcut to adjust dates. React Aria's drag-and-drop patterns or a dedicated accessibility layer can help. Our React Aria ComboBox tutorial covers accessible component patterns in more depth.

A Real Story: Building a Construction Project Timeline

A few months ago, I worked on a construction project management dashboard. The project had roughly 200 tasks—excavation, foundation, framing, electrical, plumbing, inspection—with dependencies between them. The project manager needed to adjust the schedule daily as weather and material deliveries changed.

The initial implementation used a form-based Gantt chart. Adjusting a task meant opening a modal, changing the date, saving, and waiting for the chart to re-render. The project manager hated it. "I can see the whole project," she said, "but I can't move anything."

We migrated to SVAR Gantt with drag-and-drop and auto-scheduling enabled. The project manager could grab a task bar and drag it forward. The dependent tasks moved with it. The critical path updated. The schedule stayed coherent without manual recalculation.

The change was dramatic. The project manager went from spending 30 minutes a day updating dates to 5 minutes. The chart became a planning tool, not just a status report. That's the difference drag-and-drop and auto-scheduling make.

Wrapping Up

A React Gantt chart with drag-and-drop and auto-scheduling turns a static plan into an interactive tool. Users can manipulate the schedule directly, and the dependency chains stay consistent automatically.

SVAR React Gantt is a solid choice for this: native React, TypeScript support, drag-and-drop in the free core, and auto-scheduling in the PRO edition. If you need a fully open-source option, @bluemillstudio/gantt and gantt-task-react support drag-and-drop and dependencies, though auto-scheduling may require custom logic.

For a broader comparison of Gantt libraries, see our React Gantt chart library guide. For the general charting landscape, see our React chart library comparison. And if you're dealing with large project datasets, our large datasets guide covers the performance considerations.

Now go build a Gantt chart that people actually want to use.

Need help building an interactive project management dashboard or Gantt chart in React? Red Surge Technology specializes in data-rich, interactive interfaces for project and resource management. Get in touch to discuss your project.