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Scheduling Tasks

Duration units

In Gantt, the tasks’ duration value can be measured by the following duration units,

  • Day
  • Hour
  • Minute

In Gantt, we can define duration unit for whole project by using DurationUnit property, when we defines the value for this property, this unit will be applied for all task which don’t has duration unit value. And each task in the project can be defined with different duration units and the duration unit of a task can be defined by the following ways,

  • Using TaskFields.DurationUnit property, to map the duration unit data source field.
  • Defining the duration unit value along with the duration field in the data source.

Mapping the duration unit field

The below code snippet explains the mapping of duration unit data source field to the Gantt control using the TaskFields.DurationUnit property.

tagHelper
durationUnits.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.dataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                          endDate="EndDate" duration="Duration" durationUnit="DurationUnit" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                </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,
                Progress = 70,
                DurationUnit="day"
            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 16,
                Progress = 50,
                DurationUnit = "hour"
            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 480,
                Progress = 50,
                DurationUnit = "minute"
            };
            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 = 24,
                Progress = 70,
                DurationUnit = "hour"

            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 3,
                Progress = 50,
                DurationUnit = "day"

            };
            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 int Progress { get; set; }
            public string DurationUnit { get; set; }
            
            public List<GanttDataSource> SubTasks { get; set; }
        }

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NOTE The default value of the DurationUnit property is day.

Defining duration unit along with duration field

Duration units for the tasks can also be defined along with the duration values, the below code snippet explains the duration unit for a task along with duration value,

tagHelper
durationUnitswithDuration.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>
                </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 = "3days",
                Progress = 70,
              
            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                StartDate = new DateTime(2019, 04, 02),
                Duration = "12hours",
                Progress = 50
                
            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                Duration = "1800minutes",
                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 = "480minutes",
                Progress = 70
            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                Duration = "3days",
                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 string Duration { get; set; }
            public int Progress { get; set; }
            public List<GanttDataSource> SubTasks { get; set; }
        }

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NOTE: The edit type of the duration column in Gantt is string, to support editing the duration field along with duration units.

Unscheduled Tasks

Unscheduled tasks are planned for a project without any definite schedule dates. The Gantt control supports rendering the unscheduled tasks. You can create or update the tasks with anyone of start date, end date, and duration values or none. You can enable or disable the unscheduled tasks by using the AllowUnscheduledTasks property. The following images represent the various types of unscheduled tasks in Gantt.

Start Date Only

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End Date Only

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Duration Only

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Milestone

A milestone is a task that has no start and end dates, but it has a duration value of zero. It is represented as follows.

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Define unscheduled tasks in data source

You can define the various types of unscheduled tasks in the data source as follows

tagHelper
unscheduledTasks.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px" allowUnscheduledTasks="true">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" endDate="EndDate" progress="Progress" duration="Duration">
                    </e-gantt-taskfields>
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = ganttData();
    return View();
}

 public static List<GanttDataSource> ganttData()
        {
            List<GanttDataSource> GanttDataSourceCollection = new List<GanttDataSource>();
            GanttDataSourceCollection.Add(new GanttDataSource()
            {
                TaskId = 1,
                TaskName = "Project initiation",
                Duration = 4
            });
            GanttDataSourceCollection.Add(new GanttDataSource()
            {
                TaskId = 2,
                TaskName = "Identify site location",
                StartDate = new DateTime(2019, 04, 02)
            });
            GanttDataSourceCollection.Add(new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                EndDate = new DateTime(2019, 04, 08)
            });

            GanttDataSourceCollection.Add(new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                EndDate = new DateTime(2019, 04, 06),
                Progress=50
            });
            GanttDataSourceCollection.Add(new GanttDataSource()
            {
                TaskId = 5,
                TaskName = "Project estimation",
                Duration=0
            });
            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 int Progress { get; set; }

        }

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NOTE If the AllowUnscheduledTasks property is set to false, then the Gantt control automatically calculates the scheduled date values with a default value of duration 1 and the project start date is considered as the start date for the task.

Working Time Range

In the Gantt control, working hours in a day for a project can be defined by using the DayWorkingTime property. Based on the working hours, automatic date scheduling and duration validations for a task are performed.

The following code snippet explains how to define the working time range for the project in Gantt.

tagHelper
working-time.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate" endDate="EndDate" progress="Progress" duration="Duration" child="SubTasks">
                    </e-gantt-taskfields>
                    <e-gantt-timelinesettings timelineUnitSize="60">
                        <e-timelinesettings-toptier unit="Day" format="MMM dd, y"></e-timelinesettings-toptier>
                        <e-timelinesettings-bottomtier unit="Hour" format="h.mm a"></e-timelinesettings-bottomtier>
                    </e-gantt-timelinesettings>
                    <e-gantt-dayworkingtimecollection>
                        <e-gantt-dayworkingtime from="9" to="18"></e-gantt-dayworkingtime>
                    </e-gantt-dayworkingtimecollection>
                </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 = 1,
                Progress = 70,

            };
            GanttDataSource Child2 = new GanttDataSource()
            {
                TaskId = 3,
                TaskName = "Perform soil test",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 1,
                Progress = 50

            };
            GanttDataSource Child3 = new GanttDataSource()
            {
                TaskId = 4,
                TaskName = "Soil test approval",
                StartDate = new DateTime(2019, 04, 02),
                Duration = 1,
                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 = 1,
                Progress = 70
            };
            GanttDataSource Child5 = new GanttDataSource()
            {
                TaskId = 7,
                TaskName = "List materials",
                StartDate = new DateTime(2019, 04, 04),
                Duration = 1,
                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 int Progress { get; set; }
            public List<GanttDataSource> SubTasks { get; set; }
        }

The following screen shot shows working time range in Gantt control.

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NOTE

  • Individual tasks can lie between any time within the defined working time range of the project.
  • The DayWorkingTime property is used to define the working time for the whole project.

Weekend/Non-working days

Non-working days/weekend are used to represent the non-productive days in a project. You can define the non-working days in a week using the WorkWeek property in Gantt.

tagHelper
changeWorkweek.cs
<ejs-gantt id='Gantt' dataSource="ViewBag.DataSource" height="450px" workWeek="@(new string[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday" })">
                    <e-gantt-taskfields id="TaskId" name="TaskName" startDate="StartDate"
                           endDate="EndDate" duration="Duration" progress="Progress" child="SubTasks">
                    </e-gantt-taskfields>
                </ejs-gantt>
public IActionResult Index()
{
    ViewBag.DataSource = GanttData.ProjectNewData();
    return View();
}

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By default, Saturdays and Sundays are considered as non-working days/weekend in a project. In the Gantt control, you can make weekend as working day by setting the IncludeWeekend property to true.