Updated on May 27, 2026
Using timelines has become a key pillar for business-oriented apps, as any project usually consists of time-related tasks and events. The holistic view of project activities gives a clear insight into the past and current situation in the project and allows making plans for the future. Basic timeline charts can be created using Excel, PowerPoint, MS Project, or various online services. However, timelines also serve as a foundation for more complex tools that require a custom approach when being implemented in web applications. In this article, you will learn how to meet this challenging task using DHTMLX Diagram, Gantt, and Scheduler components.
What is a JavaScript Timeline Chart?
A JavaScript timeline chart is a data visualization tool used to display tasks, events, or processes along a time axis. That is why business people, and project managers in particular, often rely on the timeline functionality for road mapping or portfolio management, but more frequently utilize it in planning tools such as project calendars and Gantt charts. With intuitive timeline-based UIs, it becomes much easier to identify various inaccuracies and take timely measures.
Creating a Standard Timeline Chart with DHTMLX Diagram Editor
If it is necessary to visually present data over a specific time span, a JavaScript timeline chart (or diagram) is exactly what you need. This type of chart serves as an effective way to show various processes that are arranged in chronological sequence.
This data visualization tool has a wide range of applications. It is commonly used for educational purposes, in historical studies, and natural sciences. With the rapid development of computer technologies, timeline charts have also gained great popularity in the business area.
That’s how a standard timeline chart looks like. This timeline is made with the help of DHTMLX Diagram editor.
Check and edit the DHTMLX timeline example >
The timeline chart above is built in the diagram editor that is a part of our JavaScript diagramming library. The editor comes with a list of predefined diagram elements that can be enriched with custom ones. Thus, you can build any popular diagram type, including a standard timeline diagram. The editor has an intuitive UI and numerous features for properly arranging diagram structures and adjusting their visual appearance in accordance with any requirements. The diagram editor can be integrated into a web app and enable end-users to build JavaScript timeline chart examples without any manipulations with code.
It is hard to imagine a modern B2B or enterprise application without a timeline functionality. In this article, we will consider possible usage scenarios of JavaScript timeline controls in project management and find out how these data visualization components are employed in DHTMLX libraries, apart from standard visualization.
JavaScript Timeline Functionality in DHTMLX Gantt
A Gantt chart, in fact, is a form of a timeline that depicts the project workflow. The Gantt chart vs Timeline chart difference is better explained in this blog post. It helps project managers to schedule tasks, allocate them between employees, and monitor their completion. But most importantly, Gantt charts give a chance to specify dependencies between tasks and calculate the critical path, thereby providing the management team with all necessary data to finish the project in time.
DHTMLX HTML5 Gantt chart offers a variety of time configuration variants for the JavaScript timeline. Gantt charts can have any number of time scales with different time units (year, month, week, etc.). It is possible to define a specific time range and time step to be displayed on the screen. For example, you can set a daily or weekly time step within a monthly time range or even specify the timeline in minutes within one day. Besides, you can adjust the timescale entirely to your needs by adding custom time units such as fiscal quarters and years.
"data": [
{ "id": "10", "text": "Project #1", "start_date": "01-04-2026", "duration": 3, "progress": 0.4, "open": true },
{ "id": "1", "text": "Task #1", "start_date": "02-04-2026", "duration": 2, "progress": 0.6, "parent": "10" },
{ "id": "2", "text": "Task #2", "start_date": "01-04-2026", "duration": 2, "progress": 0.6, "parent": "10" },
],
"links": [
{ "id": 1, "source": 1, "target": 2, "type": "0" },
{ "id": 2, "source": 2, "target": 3, "type": "0" },
{ "id": 3, "source": 3, "target": 4, "type": "0" },
]
}
gantt.init("gantt_here");
gantt.parse(tasks);
To make the work with large amounts of data more convenient, the DHTMLX Gantt widget allows swiftly navigating through the timeline using drag-and-drop.
Navigating the timeline with drag-and-drop. Check the sample >
Taking advantage of a special zooming module, users are able to toggle between Gantt chart scales or even zoom the timeline using the mouse wheel.
Zooming the timeline using the mouse wheel. Check the sample >
Other aspects of the timeline scale such as height, date format, and styling can also be modified according to the needs of users.
Among useful JavaScript timeline settings of DHTMLX Gantt, there is the ability to display only working hours and hide unnecessary dates like weekends.
Not showing weekends on the timescale. Check the sample >
Thanks to a flexible layout, Gantt charts can be complemented with additional grids and timelines. For example, the resource panel can be added to the default timeline for managing project resources. It contributes to achieving more productive resource allocation and balanced workload intensity.
Gantt chart with the resource panel. Check the sample >
DHTMLX Gantt supports the right-to-left (RTL) mode. In other words, the Gantt timeline can display textual data written in languages belonging to right-to-left writing systems (Arab, Persian, Hebrew, etc).
Gantt Chart in the RTL mode. Check the sample >
JavaScript Timeline View in DHTMLX Scheduler
When it comes to visualization of appointments, events or crucial milestones within the project without displaying its intricacies such as task relationships, then it is better to opt for the DHTMLX JavaScript Scheduler.
Timeline view of the Scheduler. Check the sample >
timeline: true
});
const sections = [
{ key: 1, label: "James Smith" },
{ key: 2, label: "John Williams" },
{ key: 3, label: "David Miller" },
{ key: 4, label: "Linda Brown" }
];
scheduler.createTimelineView({
name: "timeline",
x_unit: "minute",
x_date: "%H:%i",
x_step: 30,
x_size: 24,
x_start: 16,
x_length: 48,
y_unit: sections,
y_property: "section_id",
render: "bar"
});
scheduler.init('scheduler_here', new Date(2026, 5, 30), "timeline");
scheduler.parse([
{ start_date: "2026-06-30 09:00", end_date: "2026-06-30 12:00", text: "Task A-12458", section_id: 1 },
{ start_date: "2026-06-30 10:00", end_date: "2026-06-30 16:00", text: "Task A-89411", section_id: 2 },
{ start_date: "2026-06-30 10:00", end_date: "2026-06-30 14:00", text: "Task A-64168", section_id: 1 },
{ start_date: "2026-06-30 16:00", end_date: "2026-06-30 17:00", text: "Task A-46598", section_id: 4 },
{ start_date: "2026-06-30 12:00", end_date: "2026-06-30 20:00", text: "Task B-48865", section_id: 3 },
{ start_date: "2026-06-30 14:00", end_date: "2026-06-30 16:00", text: "Task B-44864", section_id: 3 },
{ start_date: "2026-06-30 16:30", end_date: "2026-06-30 18:00", text: "Task B-46558", section_id: 2 },
{ start_date: "2026-06-30 18:30", end_date: "2026-06-30 20:00", text: "Task B-45564", section_id: 4 },
]);
Initializing a Scheduling calendar with a Timeline View
The main peculiarity of DHTMLX Scheduler is the availability of 10 calendar views that cover all the needs of end-users regarding the display of important project undertakings. The JavaScript Timeline view is one of the most widely used views designed to showcase events or tasks assigned to resources along the timeline. Under resources, we usually mean project members responsible for tasks, meeting rooms where appointments take place, or accommodation and vehicles available for booking.
The Timeline view has four modes: bar, days, cell, and tree. In the bar mode events are drawn with the help of bars, which may occupy several time slots. The days mode enables developers to show days as timeline rows. The cell mode illustrates events in a matrix of cells. Several events can be appointed on the same day with the number of appointed events shown inside cells.
Cell mode of the Timeline view. Check the sample >
The tree mode allows organizing resources in a hierarchical tree structure on the Y-axis. For example, the Timeline view can demonstrate the work of departments and employees engaged in each department.
Tree mode of the Timeline view. Check the sample >
Moreover, it is possible to apply custom HTML content in all modes of the Timeline view. The sample below shows custom elements revealing the total quantity of tasks assigned to each manager.
Custom HTML content in the Timeline view. Check the sample >
The view comes with a horizontal scroll that makes it easier to browse through the whole calendar and find a specific event in no time. More than that, there is the auto-scroll feature, enabling project managers to change the time frames of calendar appointments by simply dragging them along the timeline.
Navigating through the calendar using the horizontal scroll. Check the sample >
The Scheduler component also allows setting up the second scale (X-axis) in the calendar timeline. An additional time scale is intended for grouping time spans of the default scale.
As the Gantt chart library, DHTMLX Scheduler supports smart rendering, thereby significantly enhancing the performance of the Timeline view. It can be very useful in data-intensive projects.
While dealing with different events, the project management office can take advantage of numerous helpful features embedded in DHTMLX Scheduler such as recurring events, custom tooltips, multisection events, multilanguage support, etc.
Use Case Scenarios for Timeline Functionality
As you can see, the timeline functionality helps solve a wide range of tasks, from basic chronological overviews to handling project workflows or schedules in real time. The timeline capabilities depend on the type of tool into which they are incorporated. Let us consider several popular scenarios and tools that work best for them.
| Use Case | Best Tool | Key Reasons |
| Large-scale projects with strict deadlines and highly interdependent workflows | Gantt chart | Support for dependencies, task constraints, critical path, and auto-scheduling |
| Shift planning scenarios | Scheduler | Multiple view modes, recurring events |
| Product roadmap visualization | Timeline chart | Intuitive chronological flow of milestones and releases |
| Hotel and room reservations, healthcare appointments, car rentals | Scheduler | Availability management, conflict prevention, interactive rescheduling |
| Construction and manufacturing planning | Gantt chart | Smooth handling of large datasets, resource allocation, split tasks, working calendars |
| Company history | Timeline chart | Visual storytelling and sequential event representation |
Time is a key metric in any business endeavor and timeline charts aid in organizing timeframes in such a way that projects can be delivered without delays. There are numerous software solutions for project management already available on the market. But integrating an interactive timeline with a JS library instead of using a costly external service can be a win-win for software development companies and their clients.
Getting Started
DHTMLX provides out-of-the-box controls with rich timeline functionality, which can be easily embedded into web applications. Extensive API and full customization of the DHTMLX planning tools enable programmers to adjust the components to their requirements. Thanks to a short learning curve and rapid technical support, developers won’t need much time to master DHTMLX.
If you have become interested in testing DHTMLX JavaScript timeline controls, download 30-day trial versions of Gantt and Scheduler widgets. You can also learn in practice how to build timeline charts in JavaScript with DHTMLX Diagram. You can download the evaluation package for a single or multiple DHTMLX components at once.
DHTMLX libraries can be purchased separately as well as in a bundle complemented with the PDF/PNG and MS Project export modules at a discount.
Related Materials:
- Timeline Example with DHTMLX Diagram
- DHTMLX Gantt Documentation
- DHTMLX Gantt Samples
- DHTMLX Scheduler Documentation
- DHTMLX Scheduler Timeline Samples