Critical Path in JavaScript Gantt

7 Jun 20234 minutes to read

The critical path in a project is indicated by a single task or a series of tasks in a project, critical path describes the calculated start date or end date of a project. If a task in a critical path is delayed, then the entire project will be delayed.

The critical path can be enabled in Gantt by using built-in toolbar button or showCriticalPath method.

Using Toolbar Icon

You can enable/disable the critical path in Gantt by using toolbar button, and this button can be enabled in the Gantt toolbar by using the following code example.

  • HTML
  • <div id="GanttContainer"></div> 
            toolbarSettings: {
                       showToolbar: true,
                       toolbarItems: [

    JavaScript Gantt toolbar icons

    Click here to view the online demo sample for critical path in Gantt.

    Using Method

    You can enable the critical path by using showCriticalPath method with parameter as true. And critical path can be disabled using the same method with parameter as false.

  • HTML
  • <script>                   
    $("#buttonOn").click(function (args) {
                    ganttObj = $("#GanttContainer").data("ejGantt");
    $("#buttonOff").click(function (args) {
                    ganttObj = $("#GanttContainer").data("ejGantt");

    JavaScript Gantt method

    Customizing critical path background

    You can customize the critical task background by setting custom color codes to the critical task elements’ class names,

    Taskbar–.e-ganttchart .e-criticaltaskbar

    Progressbar–.e-ganttchart .e-criticalprogressbar

    Connector line–.e-ganttchart .e-criticalconnectorline

    Connector line left arrow– .e-ganttchart .e-criticalconnectorlineleftarrow

    Connector line right arrow– .e-ganttchart .e-criticalconnectorlinerightarrow

  • HTML
  • <style>
        .e-ganttchart .e-criticaltaskbar {
                    background-color : #ffb366!important;
                    border-color : gray!important
        .e-ganttchart .e-criticalprogressbar {
                    background-color : #ff99cc!important;
                    border-color : #b35900!important
        .e-ganttchart .e-criticalconnectorline {
                    background-color : #b800e6!important;
        .e-ganttchart .e-criticalconnectorlineleftarrow {
                    border-right-color : #b800e6!important;
        .e-ganttchart .e-criticalconnectorlinerightarrow{
                    border-left-color : #b800e6!important;

    JavaScript Gantt critical path