Tooltip in ASP.NET CORE Gantt Component

21 Dec 202224 minutes to read

The Gantt control has a support to display a tooltip for various UI elements like taskbar, timeline cells, and grid cells.

In the Gantt control, you can enable or disable the mouse hover tooltip for the following UI elements using the TooltipSettings.ShowTooltip property:

Taskbar
Connector line
Baseline
Event marker

CSHTML
EnableTooltip.cs
<style>
        .e-gantt .e-gantt-chart .e-custom-event-marker {
            width: 1px;
            border-left: 2px green dotted;
        }
     </style>
		 
		        <ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px" renderBaseline="true" baselineColor="red">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" dependency="Predecessor"
                          endDate="EndDate" baselineStartDate="BaselineStartDate" baselineEndDate="BaselineEndDate" progress="Progress" duration="Duration" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-eventmarkers>
                        <e-gantt-eventmarker day="04/10/2019" label="Project approval and kick-off" cssClass="e-custom-event-marker"></e-gantt-eventmarker>
                    </e-gantt-eventmarkers>
                </ejs-gantt>
public IActionResult Index()
{
     ViewBag.DataSource = ganttData();
    return View();
}

public static List<GanttDataSource> ganttData()
        {
            List<GanttDataSource> GanttDataSourceCollection = new List<GanttDataSource>();

            GanttDataSource Record1 = new GanttDataSource()
            {
                TaskId = 1,
                TaskName = "Project initiation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>(),
            };
            GanttDataSource Child1 = new GanttDataSource()
            {
                TaskId = 2,
                TaskName = "Identify site location",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                BaselineStartDate= new DateTime(2019, 04, 02),
                BaselineEndDate = new DateTime(2019, 04, 08),
                Progress = 70

            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Predecessor="2FS",
                Progress = 50

            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                Duration =4,
                Progress = 50
            };
            Record1.SubTasks.Add(Child1);
            Record1.SubTasks.Add(Child2);
            Record1.SubTasks.Add(Child3);

            GanttDataSource Record2 = new GanttDataSource()
            {
                TaskId = 5,
                TaskName = "Project estimation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>()
            };
            GanttDataSource Child4 = new GanttDataSource()
            {
                TaskId = 6,
                TaskName = "Develop floor plan for estimation",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Progress = 70,
                BaselineStartDate = new DateTime(2019, 04, 02),
                BaselineEndDate = new DateTime(2019, 04, 06),
            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Predecessor = "6SS",
                Progress = 50
            };
            Record2.SubTasks.Add(Child4);
            Record2.SubTasks.Add(Child5);

            GanttDataSourceCollection.Add(Record1);
            GanttDataSourceCollection.Add(Record2);

            return GanttDataSourceCollection;
        }

        public class GanttDataSource
        {
            public int TaskId { get; set; }
            public string TaskName { get; set; }
            public DateTime StartDate { get; set; }
            public DateTime EndDate { get; set; }
            public DateTime? BaselineStartDate { get; set; }
            public DateTime? BaselineEndDate { get; set; }
            public int? Duration { get; set; }
            public int Progress { get; set; }
            public string Predecessor { get; set; }
            public List<GanttDataSource> SubTasks { get; set; }
        }

Alt text

Taskbar Tooltip

Alt text

Dependency Tooltip

Alt text

Baseline Tooltip

Alt text

Event Marker Tooltip

NOTE

The default value of the TooltipSettings.ShowTooltip property is true.

In the Gantt control, you can enable or disable the mouse hover tooltip of timeline cells using the TimelineSettings.ShowTooltip property. The default value of this property is true. The following code example shows how to enable the timeline cells tooltip in Gantt.

CSHTML
TimelinecellTooltip.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-timelinesettings showTooltip="true">
                    </e-gantt-timelinesettings>
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

Alt text

You can enable or disable the Grid cell tooltip using the Columns.ClipMode property.

CSHTML
GridcellTooltip.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-columns>
                        <e-gantt-column field="TaskId" headerText="Task ID" textAlign="Right" width="50"></e-gantt-column>
                        <e-gantt-column field="TaskName" headerText="Task Name" clipMode="EllipsisWithTooltip" width="100"></e-gantt-column>
                        <e-gantt-column field="StartDate" headerText="Start Date"></e-gantt-column>
                        <e-gantt-column field="Duration" headerText="Duration" clipMode="Clip"></e-gantt-column>
                        <e-gantt-column field="Progress" headerText="Progress"></e-gantt-column>
                    </e-gantt-columns>
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

Clip mode

The clip mode provides options to display its overflow cell content and it can be defined by the Columns.ClipMode property.

The following are three types of ClipMode:

Clip: Truncates the cell content when it overflows its area.
Ellipsis: Displays ellipsis when content of the cell overflows its area.
EllipsisWithTooltip: Displays ellipsis when content of the cell overflows its area; it displays the tooltip content when hover over ellipsis.

NOTE

By default, all the column’s ClipMode property is defined as EllipsisWithTooltip.

The default tooltip in the Gantt control can be customized using the TooltipSettings.Taskbar property. You can map the template script element’s ID value or template string directly to this property.

CSHTML
TaskbarTemplate.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-tooltipsettings taskbar="#taskbarTooltip">
                    </e-gantt-tooltipsettings>
                </ejs-gantt>

 <script type="text/x-jsrender" id="taskbarTooltip">
        <div>TaskID: ${TaskId}</div>
 </script>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

The below screenshot shows the output of above code example.

Alt text

Connector line tooltip

The default connector line tooltip in the Gantt control can be customized using the TooltipSettings.ConnectorLine property. You can map the value to this property as template script element ID or template string format. The following code example shows how to use the TooltipSettings.ConnectorLine property.

CSHTML
DependencyLineTemplate.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" progress="Progress" dependency="Predecessor" duration="Duration" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-tooltipsettings connectorLine="#dependencyLineTooltip">
                    </e-gantt-tooltipsettings>
                </ejs-gantt>

 <script type="text/x-jsrender" id="dependencyLineTooltip">
        <div>Offset : ${offsetString}</div>
</script>
public IActionResult Index()
{
     ViewBag.DataSource = ganttData();
     return View();
}
public static List<GanttDataSource> ganttData()
        {
            List<GanttDataSource> GanttDataSourceCollection = new List<GanttDataSource>();

            GanttDataSource Record1 = new GanttDataSource()
            {
                TaskId = 1,
                TaskName = "Project initiation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>(),
            };
            GanttDataSource Child1 = new GanttDataSource()
            {
                TaskId = 2,
                TaskName = "Identify site location",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Progress = 70,

            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Progress = 50,
                Predecessor = "2FS"

            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 4,
                Progress = 50,
                Predecessor = "3FS"
            };
            Record1.SubTasks.Add(Child1);
            Record1.SubTasks.Add(Child2);
            Record1.SubTasks.Add(Child3);

            GanttDataSource Record2 = new GanttDataSource()
            {
                TaskId = 5,
                TaskName = "Project estimation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>()
            };
            GanttDataSource Child4 = new GanttDataSource()
            {
                TaskId = 6,
                TaskName = "Develop floor plan for estimation",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Progress = 70
            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Progress = 50,
                Predecessor = "6SS"
            };
            Record2.SubTasks.Add(Child4);
            Record2.SubTasks.Add(Child5);

            GanttDataSourceCollection.Add(Record1);
            GanttDataSourceCollection.Add(Record2);

            return GanttDataSourceCollection;
        }

        public class GanttDataSource
        {
            public int TaskId { get; set; }
            public string TaskName { get; set; }
            public string Predecessor { get; set; }
            public DateTime StartDate { get; set; }
            public DateTime EndDate { get; set; }
            public int? Duration { get; set; }
            public int Progress { get; set; }
            public List<GanttDataSource> SubTasks { get; set; }
        }

The below screenshot shows the output of above code example.

Alt text

The taskbar editing tooltip can be customized using the TooltipSettings.Editing property. The following code example shows how to customize the taskbar editing tooltip in Gantt.

CSHTML
EditingTemplate.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" endDate="EndDate" progress="Progress" child="SubTasks" duration="Duration">
                    </e-gantt-taskfields>
                    <e-gantt-editsettings allowTaskbarEditing="true"></e-gantt-editsettings>
                    <e-gantt-tooltipsettings editing="#editingTooltip">
                    </e-gantt-tooltipsettings>
                </ejs-gantt>

 <script type="text/x-jsrender" id="editingTooltip">
        <div>Duration : ${duration}</div>
 </script>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

The below screenshot shows the output of above code example.

Alt text

A baseline tooltip can be customized using the TooltipSettings.Baseline property. The following code example shows how to customize the baseline tooltip in Gantt.

CSHTML
BaselineTemplate.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px" renderBaseline="true" baselineColor="red">
                    <e-gantt-taskfields id="TaskId" baselineStartDate="BaselineStartDate" baselineEndDate="BaselineEndDate" name="TaskName" startDate="StartDate" endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-tooltipsettings baseline="#baselineTemplate">
                    </e-gantt-tooltipsettings>
                </ejs-gantt>

<script type="text/x-jsrender" id="baselineTemplate">
        <div>Baseline StartDate : ${this.getFormatedDate(BaselineStartDate)}</div>
</script>
public IActionResult Index()
{
     ViewBag.DataSource = ganttData();
    return View();


  public static List<GanttDataSource> ganttData()
        {
            List<GanttDataSource> GanttDataSourceCollection = new List<GanttDataSource>();

            GanttDataSource Record1 = new GanttDataSource()
            {
                TaskId = 1,
                TaskName = "Project initiation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>(),
            };
            GanttDataSource Child1 = new GanttDataSource()
            {
                TaskId = 2,
                TaskName = "Identify site location",
                StartDate = new DateTime(2019, 04, 02),
                BaselineStartDate = new DateTime(2019, 04, 02),
                BaselineEndDate = new DateTime(2019, 04, 02),
                Duration = 0,
                Progress = 70,

            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                StartDate = new DateTime(2019, 04, 02),
                BaselineStartDate = new DateTime(2019, 04, 04),
                BaselineEndDate = new DateTime(2019, 04, 09),
                Duration = 8,
                Progress = 50

            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                BaselineStartDate = new DateTime(2019, 04, 08),
                BaselineEndDate = new DateTime(2019, 04, 12),
                Duration = 4,
                Progress = 50
            };
            Record1.SubTasks.Add(Child1);
            Record1.SubTasks.Add(Child2);
            Record1.SubTasks.Add(Child3);

            GanttDataSource Record2 = new GanttDataSource()
            {
                TaskId = 5,
                TaskName = "Project estimation",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 21),
                SubTasks = new List<GanttDataSource>()
            };
            GanttDataSource Child4 = new GanttDataSource()
            {
                TaskId = 6,
                TaskName = "Develop floor plan for estimation",
                StartDate = new DateTime(2019, 04, 04),
                BaselineStartDate = new DateTime(2019, 04, 08),
                BaselineEndDate = new DateTime(2019, 04, 12),
                Duration = 4,
                Progress = 70
            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                BaselineStartDate = new DateTime(2019, 04, 02),
                BaselineEndDate = new DateTime(2019, 04, 02),
                Duration = 0,
                Progress = 50
            };
            Record2.SubTasks.Add(Child4);
            Record2.SubTasks.Add(Child5);

            GanttDataSourceCollection.Add(Record1);
            GanttDataSourceCollection.Add(Record2);

            return GanttDataSourceCollection;
        }

        public class GanttDataSource
        {
            public int TaskId { get; set; }
            public string TaskName { get; set; }
            public DateTime StartDate { get; set; }
            public DateTime EndDate { get; set; }
            public int? Duration { get; set; }
            public DateTime? BaselineStartDate { get; set; }
            public DateTime? BaselineEndDate { get; set; }
            public int Progress { get; set; }
            public List<GanttDataSource> SubTasks { get; set; }
        }}

The following screenshot shows the template for baseline in Gantt.

Alt text

Tooltip

Enable tooltip

Timeline cells tooltip

Cell tooltip

Clip mode

Tooltip template

Taskbar tooltip

Connector line tooltip

Taskbar editing tooltip

Baseline tooltip