Workflow Restrictions in Blazor Kanban Component

7 Oct 202512 minutes to read

The Blazor Kanban workflow controls how cards move between columns. It enables restrictions when a card is moved from one column to another and supports disabling drag-and-drop actions per column.

Prevent transition across columns

Provides restriction on columns when performing drag and drop actions while providing the KeyField inside the TransitionColumns property. If a card is dragged, dotted border line will be shown on the possible drop columns and the not-allowed cursor point will be shown in the restricted dropped columns.

@using Syncfusion.Blazor.Kanban

<SfKanban TValue="TasksModel" KeyField="Status" DataSource="Tasks">
    <KanbanColumns>
        <KanbanColumn HeaderText="Backlog" KeyField="@(new List<string>() {"Open"})" TransitionColumns="@(new List<string>() {"InProgress"})"></KanbanColumn>
        <KanbanColumn HeaderText="In Progress" KeyField="@(new List<string>() {"InProgress"})" TransitionColumns="@(new List<string>() {"Testing"})"></KanbanColumn>
        <KanbanColumn HeaderText="Testing" KeyField="@(new List<string>() {"Testing"})" TransitionColumns="@(new List<string>() {"Close"})"></KanbanColumn>
        <KanbanColumn HeaderText="Done" KeyField="@(new List<string>() {"Close"})"></KanbanColumn>
    </KanbanColumns>
    <KanbanCardSettings HeaderField="Id" ContentField="Summary"></KanbanCardSettings>
</SfKanban>

@code {
    public class TasksModel
    {
        public string Id { get; set; }
        public string Title { get; set; }
        public string Status { get; set; }
        public string Summary { get; set; }
        public string Assignee { get; set; }
    }

    public List<TasksModel> Tasks = new List<TasksModel>()
{
        new TasksModel { Id = "Task 1", Title = "BLAZ-29001", Status = "Open", Summary = "Analyze the new requirements gathered from the customer.", Assignee = "Nancy Davloio" },
        new TasksModel { Id = "Task 2", Title = "BLAZ-29002", Status = "InProgress", Summary = "Improve application performance", Assignee = "Andrew Fuller" },
        new TasksModel { Id = "Task 3", Title = "BLAZ-29003", Status = "Open", Summary = "Arrange a web meeting with the customer to get new requirements.", Assignee = "Janet Leverling" },
        new TasksModel { Id = "Task 4", Title = "BLAZ-29004", Status = "InProgress", Summary = "Fix the issues reported in the IE browser.", Assignee = "Janet Leverling" },
        new TasksModel { Id = "Task 5", Title = "BLAZ-29005", Status = "Review", Summary = "Fix the issues reported by the customer.", Assignee = "Steven walker" },
        new TasksModel { Id = "Task 6", Title = "BLAZ-29006", Status = "Testing", Summary = "Fix the issues reported in Safari browser.", Assignee = "Nancy Davloio" },
        new TasksModel { Id = "Task 7", Title = "BLAZ-29007", Status = "Close", Summary = "Test the application in the IE browser.", Assignee = "Margaret hamilt" },
        new TasksModel { Id = "Task 8", Title = "BLAZ-29008", Status = "Testing", Summary = "Validate the issues reported by the customer.", Assignee = "Steven walker" },
        new TasksModel { Id = "Task 9", Title = "BLAZ-29009", Status = "Open", Summary = "Show the retrieved data from the server in grid control.", Assignee = "Margaret hamilt" },
        new TasksModel { Id = "Task 10", Title = "BLAZ-29010", Status = "InProgress", Summary = "Fix cannot open user’s default database SQL error.", Assignee = "Janet Leverling" }
    };
}

Prevent Drop actions

To prevent cards from being dropped into a column, set the AllowDrop property to false.

In the following code, the Backlog column will not allow any card drop action within the column and any other columns cards.

@using Syncfusion.Blazor.Kanban

<SfKanban TValue="TasksModel" KeyField="Status" DataSource="Tasks">
    <KanbanColumns>
        <KanbanColumn HeaderText="Backlog" KeyField="@(new List<string>() {"Open"})" AllowDrop="false"></KanbanColumn>
        <KanbanColumn HeaderText="In Progress" KeyField="@(new List<string>() {"InProgress"})" TransitionColumns="@(new List<string>() {"Testing"})"></KanbanColumn>
        <KanbanColumn HeaderText="Testing" KeyField="@(new List<string>() {"Testing"})" TransitionColumns="@(new List<string>() {"Close"})"></KanbanColumn>
        <KanbanColumn HeaderText="Done" KeyField="@(new List<string>() {"Close"})"></KanbanColumn>
    </KanbanColumns>
    <KanbanCardSettings HeaderField="Id" ContentField="Summary"></KanbanCardSettings>
</SfKanban>

@code {
    public class TasksModel
    {
        public string Id { get; set; }
        public string Title { get; set; }
        public string Status { get; set; }
        public string Summary { get; set; }
        public string Assignee { get; set; }
    }

    public List<TasksModel> Tasks = new List<TasksModel>()
{
        new TasksModel { Id = "Task 1", Title = "BLAZ-29001", Status = "Open", Summary = "Analyze the new requirements gathered from the customer.", Assignee = "Nancy Davloio" },
        new TasksModel { Id = "Task 2", Title = "BLAZ-29002", Status = "InProgress", Summary = "Improve application performance", Assignee = "Andrew Fuller" },
        new TasksModel { Id = "Task 3", Title = "BLAZ-29003", Status = "Open", Summary = "Arrange a web meeting with the customer to get new requirements.", Assignee = "Janet Leverling" },
        new TasksModel { Id = "Task 4", Title = "BLAZ-29004", Status = "InProgress", Summary = "Fix the issues reported in the IE browser.", Assignee = "Janet Leverling" },
        new TasksModel { Id = "Task 5", Title = "BLAZ-29005", Status = "Review", Summary = "Fix the issues reported by the customer.", Assignee = "Steven walker" },
        new TasksModel { Id = "Task 6", Title = "BLAZ-29006", Status = "Testing", Summary = "Fix the issues reported in Safari browser.", Assignee = "Nancy Davloio" },
        new TasksModel { Id = "Task 7", Title = "BLAZ-29007", Status = "Close", Summary = "Test the application in the IE browser.", Assignee = "Margaret hamilt" },
        new TasksModel { Id = "Task 8", Title = "BLAZ-29008", Status = "Testing", Summary = "Validate the issues reported by the customer.", Assignee = "Steven walker" },
        new TasksModel { Id = "Task 9", Title = "BLAZ-29009", Status = "Open", Summary = "Show the retrieved data from the server in grid control.", Assignee = "Margaret hamilt" },
        new TasksModel { Id = "Task 10", Title = "BLAZ-29010", Status = "InProgress", Summary = "Fix cannot open user’s default database SQL error.", Assignee = "Janet Leverling" }
    };
}

Prevent Drag actions

To prevent cards from being dragged from a column, set the AllowDrag property to false.

In the following code, the Done column will not allow any card drag action within the column.

@using Syncfusion.Blazor.Kanban

<SfKanban TValue="TasksModel" KeyField="Status" DataSource="Tasks">
    <KanbanColumns>
        <KanbanColumn HeaderText="Backlog" KeyField="@(new List<string>() {"Open"})" AllowDrop="false"></KanbanColumn>
        <KanbanColumn HeaderText="In Progress" KeyField="@(new List<string>() {"InProgress"})" TransitionColumns="@(new List<string>() {"Testing"})"></KanbanColumn>
        <KanbanColumn HeaderText="Testing" KeyField="@(new List<string>() {"Testing"})" TransitionColumns="@(new List<string>() {"Close"})"></KanbanColumn>
        <KanbanColumn HeaderText="Done" KeyField="@(new List<string>() {"Close"})" AllowDrag="false"></KanbanColumn>
    </KanbanColumns>
    <KanbanCardSettings HeaderField="Id" ContentField="Summary"></KanbanCardSettings>
    <KanbanSwimlaneSettings KeyField="Assignee"></KanbanSwimlaneSettings>
</SfKanban>

@code {
    public class TasksModel
    {
        public string Id { get; set; }
        public string Title { get; set; }
        public string Status { get; set; }
        public string Summary { get; set; }
        public string Assignee { get; set; }
        public string AssigneeName { get; set; }
    }

    public List<TasksModel> Tasks = new List<TasksModel>()
{
        new TasksModel { Id = "Task 1", Title = "BLAZ-29001", Status = "Open", Summary = "Analyze the new requirements gathered from the customer.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 2", Title = "BLAZ-29002", Status = "InProgress", Summary = "Improve application performance", Assignee = "Andrew Fuller", AssigneeName = "Andrew" },
        new TasksModel { Id = "Task 3", Title = "BLAZ-29003", Status = "Open", Summary = "Arrange a web meeting with the customer to get new requirements.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 4", Title = "BLAZ-29004", Status = "InProgress", Summary = "Fix the issues reported in the IE browser.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 5", Title = "BLAZ-29005", Status = "Review", Summary = "Fix the issues reported by the customer.", Assignee = "Steven walker", AssigneeName = "Steven" },
        new TasksModel { Id = "Task 6", Title = "BLAZ-29006", Status = "Review", Summary = "Fix the issues reported in Safari browser.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 7", Title = "BLAZ-29007", Status = "Close", Summary = "Test the application in the IE browser.", Assignee = "Margaret hamilt", AssigneeName = "Margaret" },
        new TasksModel { Id = "Task 8", Title = "BLAZ-29008", Status = "Validate", Summary = "Validate the issues reported by the customer.", Assignee = "Steven walker", AssigneeName = "Steven" },
        new TasksModel { Id = "Task 9", Title = "BLAZ-29009", Status = "Open", Summary = "Show the retrieved data from the server in grid control.", Assignee = "Margaret hamilt", AssigneeName = "Margaret" },
        new TasksModel { Id = "Task 10", Title = "BLAZ-29010", Status = "InProgress", Summary = "Fix cannot open user’s default database SQL error.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 11", Title = "BLAZ-29011", Status = "Review", Summary = "Fix the issues reported in data binding.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 12", Title = "BLAZ-29012", Status = "Close", Summary = "Analyze SQL server 2008 connection.", Assignee = "Andrew Fuller", AssigneeName = "Andrew" },
        new TasksModel { Id = "Task 13", Title = "BLAZ-29013", Status = "Validate", Summary = "Validate databinding issues.", Assignee = "Margaret hamilt", AssigneeName = "Margaret" },
        new TasksModel { Id = "Task 14", Title = "BLAZ-29014", Status = "Close", Summary = "Analyze grid control.", Assignee = "Margaret hamilt", AssigneeName = "Margaret" },
        new TasksModel { Id = "Task 15", Title = "BLAZ-29015", Status = "Close", Summary = "Stored procedure for initial data binding of the grid.", Assignee = "Steven walker", AssigneeName = "Steven" },
        new TasksModel { Id = "Task 16", Title = "BLAZ-29016", Status = "Close", Summary = "Analyze stored procedures.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 17", Title = "BLAZ-29017", Status = "Validate", Summary = "Validate editing issues.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 18", Title = "BLAZ-29018", Status = "Review", Summary = "Test editing functionality.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 19", Title = "BLAZ-29019", Status = "Open", Summary = "Enhance editing functionality.", Assignee = "Andrew Fuller", AssigneeName = "Andrew" },
        new TasksModel { Id = "Task 20", Title = "BLAZ-29020", Status = "InProgress", Summary = "Improve the performance of the editing functionality.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 21", Title = "BLAZ-29021", Status = "Open", Summary = "Arrange web meeting with the customer to show editing demo.", Assignee = "Steven walker", AssigneeName = "Steven" },
        new TasksModel { Id = "Task 22", Title = "BLAZ-29022", Status = "Review", Summary = "Fix the editing issues reported by the customer.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 23", Title = "BLAZ-29023", Status = "Testing", Summary = "Fix the issues reported by the customer.", Assignee = "Steven walker", AssigneeName = "Steven" },
        new TasksModel { Id = "Task 24", Title = "BLAZ-29024", Status = "Testing", Summary = "Fix the issues reported in Safari browser.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 25", Title = "BLAZ-29025", Status = "Testing", Summary = "Fix the issues reported in data binding.", Assignee = "Janet Leverling", AssigneeName = "Janet" },
        new TasksModel { Id = "Task 26", Title = "BLAZ-29026", Status = "Testing", Summary = "Test editing functionality.", Assignee = "Nancy Davloio", AssigneeName = "Nancy" },
        new TasksModel { Id = "Task 27", Title = "BLAZ-29027", Status = "Testing", Summary = "Test editing feature in the IE browser.", Assignee = "Janet Leverling", AssigneeName = "Janet" }
    };
}