Manually add tasks

[Timothy]

I would like an example of how I can load tasks manually into a Gantt.... not a data binding but something similar to:

 

RadGantt.Task.Add(new Task());

then... RadGantt.DataBind() or something to get it to update from code behind in C#

 

Thanks

 

Tim

[Bozhidar]

Hi,

I've attached a sample page where the Gantt control is bound entirely in code behind, with implementation for every CRUD operation.

Regards,
Bozhidar
Telerik

[Timothy]

Thank you for the response. I have looked at this example already and I have an issues more related to timing I suppose in getting this to work.

 I have a search box that I use to search for a work order. I respond to the search request and pull that work order information out of the database and then set some fields on the page as part of the response.

 What I don't understand are 2 things:

 

1. When is the Task list updated?

2. How can I manually update the Tasks list and force and update during the time that I am gathering the information from the work order from the original search request.

 

I tried to mimic what you did for Tasks in the segment of code where I gather the information:

 

List<Task> sessionTasks = Session[TasksKey] as List<Task>;

                    if (sessionTasks == null)
                        sessionTasks = new List<Task>();
                    else sessionTasks.Clear();
                    

                    Task sr_start = new Task();
                    sr_start.ID = 1;
                    sr_start.Start = wo.ReportedDate;
                    sr_start.End = wo.ActualStart;
                    sr_start.Title = "SR Created";
                    sr_start.OrderID = 0;

                    sessionTasks.Add(sr_start);

                    foreach(WorkOrderHistory woh in wo.history)
                    {
                        Task t = new Task();
                        t.ID = 1;
                        t.Start = woh.Date;
                        t.Title = woh.Status;
                        sessionTasks.Add(t);
                        Debug.WriteLine("Added: " + woh.Status);
                        WorkOrderTimeLine.Tasks.Add(t);
                    }

                    Session[TasksKey] = sessionTasks;

 

But, it does not update the tasks... worse yet, the page freezes and crashes in Chrome.

How could I accomplish this? Or, if you can give me a better method to accomplish this I am OK with that as well.

 

Thanks

 

Tim

[Bozhidar]

Hello,

1. When is the Task list updated? - In the provided sample the list is stored in Session, so that the changes made on the client will be preserved upon each postback. In the sample the list itself is not updated. On Created, Delete and Update operations a server event is triggered and items are added or removed from the list.

2. If you want to reset the list, you simply have to clear the Tasks collection and add the new items. I've updated the sample project, adding a button. On button click the gantt data is cleared and a new task is added, simulating your use case.

Regards,
Bozhidar
Telerik

[Echan]

i got error 404, when trying to download the Gantt.zip file.

Is it stillavailable?

[Bozhidar]

Hi,

There is a minor issue with our server. For your convenience I'm pasting the markup and codebehind from the attached zip file:

Markup:

<telerik:RadGantt runat="server" ID="RadGantt1"

    SnapToGrid="false"

    OnDependencyInsert="RadGantt1_DependencyInsert"
    OnDependencyDelete="RadGantt1_DependencyDelete"

    OnTaskDelete="RadGantt1_TaskDelete"
    OnTaskUpdate="RadGantt1_TaskUpdate"
    OnTaskInsert="RadGantt1_TaskInsert">
    <DataBindings>
        <TasksDataBindings  IdField="ID"  TitleField="Title"  StartField="Start"  EndField="End"
            PercentCompleteField="PercentComplete"  OrderIdField="OrderID"  SummaryField="Summary"  ParentIdField="ParentID" />
        <DependenciesDataBindings  IdField="ID"  PredecessorIdField="PredecessorID"
            SuccessorIdField="SuccessorID"  TypeField="Type" />
    </DataBindings>
</telerik:RadGantt>

<asp:Button ID="Button1" Text="Change Data" runat="server" OnClick="Button1_Click" />

CodeBehind:

using System;
using System.Collections.Generic;
using System.Linq;
using Telerik.Web.UI.Gantt;

public partial class Temp_GanttBinding_List : System.Web.UI.Page
{
    private const string TasksKey = "Telerik.GanttSample.Tasks";
    private const string DependenciesKey = "Telerik.GanttSample.Dependencies";

    private List<Task> Tasks
    {
        get
        {
            List<Task> sessionTasks = Session[TasksKey] as List<Task>;

            if (sessionTasks == null)
            {
                sessionTasks = new List<Task>();

                sessionTasks.Add(new Task { ID = 1, Title = "First Task",
                    Start = new DateTime(2014, 8, 5, 9, 10, 0), End = new DateTime(2014, 8, 5, 12, 40, 0), OrderID = 0 });

                Session[TasksKey] = sessionTasks;
            }

            return sessionTasks;
        }
    }

    public List<Dependency> Dependencies
    {
        get
        {
            List<Dependency> sessionDependencies = Session[DependenciesKey] as List<Dependency>;

            if (sessionDependencies == null)
            {
                sessionDependencies = new List<Dependency>();

                Session[DependenciesKey] = sessionDependencies;
            }

            return sessionDependencies;
        }
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        RadGantt1.DataSource = Tasks;
        RadGantt1.DependenciesDataSource = Dependencies;
    }

    protected void RadGantt1_TaskDelete(object sender, TaskEventArgs e)
    {
        foreach (Task task in e.Tasks)
        {
            var original = GetByID((int)task.ID);

            Tasks.Remove(original);
        }
    }

    protected void RadGantt1_TaskUpdate(object sender, TaskEventArgs e)
    {
        foreach (Task task in e.Tasks)
        {
            var original = GetByID((int)task.ID);

            original.Start = task.Start;
            original.End = task.End;
            original.Title = task.Title;
            original.PercentComplete = task.PercentComplete;
            original.OrderID = task.OrderID;
            original.Summary = task.Summary;
            original.ParentID = task.ParentID;
        }
    }

    protected void RadGantt1_TaskInsert(object sender, TaskEventArgs e)
    {
        foreach (Task task in e.Tasks)
        {
            task.ID = NextID();

            Tasks.Add(task);
        }
    }

    private Task GetByID(int id)
    {
        return Tasks.Find((task) => (int)task.ID == id);
    }

    private int NextID()
    {
        var nextID = 0;

        foreach (ITask task in Tasks)
        {
            if ((int)task.ID > 0)
            {
                nextID = (int)task.ID;
            }
        }

        return ++nextID;
    }

    protected void RadGantt1_DependencyInsert(object sender, DependencyEventArgs e)
    {
        foreach (Dependency dependency in e.Dependencies)
        {
            dependency.ID = NextDependencyID();

            Dependencies.Add(dependency);
        }
    }

    protected void RadGantt1_DependencyDelete(object sender, DependencyEventArgs e)
    {
        foreach (Dependency dependency in e.Dependencies)
        {
            var original = GetDependencyByID((int)dependency.ID);

            Dependencies.Remove(original);
        }
    }

    private Dependency GetDependencyByID(int id)
    {
        return Dependencies.Find((dependency) => (int)dependency.ID == id);
    }

    private int NextDependencyID()
    {
        var nextID = 0;

        foreach (IDependency dependency in Dependencies)
        {
            if ((int)dependency.ID > 0)
            {
                nextID = (int)dependency.ID;
            }
        }

        return ++nextID;
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Tasks.Clear();
        Tasks.Add(new Task
        {
            ID = 1,
            Title = "New Task",
            Start = new DateTime(2014, 8, 5, 9, 10, 0),
            End = new DateTime(2014, 8, 5, 12, 40, 0),
            OrderID = 0
        });
    }
}

Regards,
Bozhidar
Telerik by Progress