What is a Progress Line and How It Benefits a Gantt Chart<\/h5>\n
In complex Gantt chart scenarios, members of the project team or stakeholders may struggle to promptly and accurately estimate the current status of multiple tasks. That\u2019s where a progress line can come in handy. It is a visual indicator in the form of a curved line that displays the current status of tasks relative to their planned timelines. This line stems from the current date and indicates the progress of each task, giving the team a clear visual summary of the project’s status. This feature also helps project teams to quickly understand if any adjustments are required without diving into detailed data.<\/p>\n
Overall, end-users can get the following benefits from the implementation of a progress line:<\/p>\n
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- at-a-glance understanding of task statuses (on track, ahead, or delayed)<\/li>\n
- decreased risk of missing deadlines and resource misallocation<\/li>\n
- enhanced team coordination<\/li>\n
- better workflow transparency<\/li>\n<\/ul>\n
As a result, this feature helps project teams to maintain clarity and good timing in project management workflows. <\/p>\n
Here is a sample of a Gantt chart with a progress line built with DHTMLX:
\n![\"Gantt](\"https:\/\/dhtmlx.com\/blog\/wp-content\/uploads\/2025\/01\/image2.png\")
Check the sample ><\/a><\/p>\nGuide on Complementing DHTMLX Gantt with Progress Line<\/h5>\n
DHTMLX Gantt does not provide the progress line feature by default, but it can be easily added to the Gantt configuration via the Gantt API. <\/p>\n
Prerequisites<\/h6>\n
We won\u2019t dwell on adding a JavaScript Gantt chart on a web page and configuring it since these aspects are well covered in the documentation<\/a>. Instead, we would like to focus on important details related to creating progress lines.<\/p>\n
From a coding perspective, a progress line is a custom element that can be displayed in the Gantt timeline with the addTasklayer()<\/a><\/strong> method. This method is called for each row with the task, meaning you can add the progress line in pieces. <\/p>\n
If the task starts before the current date and is completed or the task has a progress status of 0% and starts after the current date, you\u2019ll need to add one straight line. If the task progress is from 0 to 100%, you draw two lines associated with the current date and progress of the task. It can be done with SVG. You\u2019ll need three progress line coordinates:<\/p>\n
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- top point related to the task row and the date position in the timeline<\/li>\n
- bend point related to the current task progress (and its date)<\/li>\n
- bottom point related to the task row and the date position in the timeline<\/li>\n<\/ul>\n
Step 1: Positioning of Required Elements<\/h6>\n