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Gantt in Razor Pages

Razor Pages is an alternative to the MVC pattern that makes page-focused coding easier and more productive. This approach consists of a cshtml file and a cshtml.cs file (by design, the two files have the same name).

You can seamlessly integrate the Telerik UI Gantt for ASP.NET MVC in Razor Pages applications.

This article describes how to configure the Gantt component in a Razor Pages scenario.

For the complete project, refer to the Gantt in Razor Pages example.

Getting Started

To configure the CRUD operations of the Gantt DataSource within a Razor Pages application, follow the next steps:

  1. Specify the Read, Create, Update, and Destroy options of the DataSource in the DataSource configuration. The URL in each of these options must refer to the method name in the PageModel.
tab-HtmlHelper(csthml)
    @page
    @model IndexModel
    @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
    @Html.AntiForgeryToken()

    @(Html.Kendo().Gantt<TaskViewModel, DependencyViewModel>()
        .Name("gantt")
        .Columns(columns =>
        {
            columns.Bound(c => c.TaskID).Title("ID").Width(80);
            columns.Bound(c => c.Title).Width(250).Editable(true).Sortable(true);
            columns.Bound(c => c.Start).Width(150).Editable(true).Sortable(true);
            columns.Bound(c => c.End).Width(150).Editable(true).Sortable(true);
        })
        .Views(views =>
        {
            views.DayView();
            views.WeekView(weekView => weekView.Selected(true));
            views.MonthView();
        })
        .Height(700)
        .ShowWorkHours(false)
        .ShowWorkDays(false)
        .Snap(false)
        .DataSource(d => d
            .Model(m =>
            {
                m.Id(f => f.TaskID);
                m.ParentId(f => f.ParentID);
                m.Field(f => f.Expanded).DefaultValue(true);
                m.Field<string>(f=>f.TaskID);
            })
            .Read(r => r.Url("/Gantt/GanttIndex?handler=Read").Data("forgeryToken"))
            .Create(r => r.Url("/Gantt/GanttIndex?handler=Create").Data("forgeryToken"))
            .Update(r => r.Url("/Gantt/GanttIndex?handler=Update").Data("forgeryToken"))
            .Destroy(r => r.Url("/Gantt/GanttIndex?handler=Destroy").Data("forgeryToken"))
        )
        .DependenciesDataSource(d => d
            .Model(m =>
            {
                m.Id(f => f.DependencyID);
                m.PredecessorId(f => f.PredecessorID);
                m.SuccessorId(f => f.SuccessorID);
            })
            .Read(r => r.Url("/Gantt/GanttIndex?handler=DependenciesRead").Data("forgeryToken"))
        )
    )

    <script>
        function forgeryToken() {
            return kendo.antiForgeryTokens();
        }
    </script>

  1. Add an AntiForgeryToken at the top of the page.

    Razor
        @inject Microsoft.AspNetCore.Antiforgery.IAntiforgery Xsrf
    @Html.AntiForgeryToken()

  2. Send the AntiForgeryToken with the Read request.

    Razor
        <script>
        function forgeryToken() {
            return kendo.antiForgeryTokens();
        }
    </script>

    Additional parameters can also be supplied.

    Razor
        <script>
        function forgeryToken() {
            return {
                __RequestVerificationToken: kendo.antiForgeryTokens().__RequestVerificationToken,
                additionalParameter: "test"
            }
        }
    </script>

  3. Within the cshtml.cs file, add a handler method for each data operation.

    tab-Index.cshtml.cs
        public JsonResult OnPostRead([DataSourceRequest] DataSourceRequest request)
    {
        return new JsonResult(tasks.ToDataSourceResult(request));
    }

    public JsonResult OnPostCreate([DataSourceRequest] DataSourceRequest request, TaskViewModel task)
    {
        task.TaskID = Guid.NewGuid().ToString();

        if (ModelState.IsValid)
        {
            tasks.Add(task);
        }
        return new JsonResult(new[] { task }.ToDataSourceResult(request, ModelState));
    }

    public JsonResult OnPostUpdate([DataSourceRequest] DataSourceRequest request, TaskViewModel task)
    {
        int index = tasks.IndexOf(tasks.FirstOrDefault(item => { return item.TaskID == task.TaskID; }));
        tasks[index] = task;

        return new JsonResult(new[] { task }.ToDataSourceResult(request, ModelState));
    }

    public JsonResult OnPostDestroy([DataSourceRequest] DataSourceRequest request, TaskViewModel task)
    {
        int index = tasks.IndexOf(tasks.FirstOrDefault(item => { return item.TaskID == task.TaskID; }));
        tasks.RemoveAt(index);

        return new JsonResult(new[] { task }.ToDataSourceResult(request, ModelState));
    }

    public JsonResult OnPostDependenciesRead([DataSourceRequest] DataSourceRequest request)
    {
        return new JsonResult(dependencies.ToDataSourceResult(request));
    }

    public JsonResult OnPostDependenciesCreate([DataSourceRequest] DataSourceRequest request, DependencyViewModel dependency)
    {
        if (ModelState.IsValid)
        {
            dependencies.Add(dependency);
        }

        return new JsonResult(new[] { dependency }.ToDataSourceResult(request, ModelState));
    }

    public JsonResult OnPostDependenciesUpdate([DataSourceRequest] DataSourceRequest request, DependencyViewModel dependency)
    {
        int index = dependencies.IndexOf(dependencies.FirstOrDefault(item => { return item.DependencyID == dependency.DependencyID; }));
        dependencies[index] = dependency;

        return new JsonResult(new[] { dependency }.ToDataSourceResult(request, ModelState));
    }

    public JsonResult OnPostDependenciesDestroy([DataSourceRequest] DataSourceRequest request, DependencyViewModel dependency)
    {
        int index = dependencies.IndexOf(dependencies.FirstOrDefault(item => { return item.DependencyID == dependency.DependencyID; }));
        dependencies.RemoveAt(index);

        return new JsonResult(new[] { dependency }.ToDataSourceResult(request, ModelState));
    }

See Also

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