DiagramExtension Class

The Diagram extension.

Namespace: DevExpress.Web.Mvc

Assembly: DevExpress.Web.Mvc5.v24.2.dll

Declaration

C#

public class DiagramExtension :
    ExtensionBase

VB.NET

Public Class DiagramExtension
    Inherits ExtensionBase

Related API Members

The following members return DiagramExtension objects:

• DiagramExtension.Bind(Object, Object)
• DiagramExtension.Bind(Object)
• DiagramExtension.Import(String)
• ExtensionsFactory.Diagram(Action<DiagramSettings>)
• ExtensionsFactory.Diagram(DiagramSettings)

Remarks

The Diagram extension’s (DiagramExtension) diagram editor allows you to create professional diagrams online. You can import a diagram data file or bind the extension to a data source.

Implementation Details

To declare the Diagram in a View, invoke the Diagram helper method. The method returns the Diagram extension object that is implemented by the DiagramExtension class. To configure the Diagram extension, pass the DiagramSettings object to the Diagram helper method as a parameter.

The MVCxClientDiagram class object represents the Diagram’s client counterpart.

Declaration

The following code illustrates how to add the Diagram to a view:

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
}).GetHtml()

Bind to Data

The Diagram extension can create diagrams from hierarchical (tree-like) and graph data structures, and automatically arrange this data on the page.

The supported data structures are listed below.

Node and Edge Data Sources

If the information about nodes is maintained separately from the information about edges, bind the extension to data as follows.

• Bind the Diagram extension to two data sources (Bind(Object, Object)): one for shapes (nodeDataObject) and another for shape connectors (edgeDataObject).
• Add mapping information for a shape’s Key and a connector’s Key, FromKey and ToKey properties.
• Optionally specify other mapping properties for shapes and mapping properties for connectors.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.BatchUpdateRouteValues = new { Controller = "DataBinding", Action = "NodesAndEdgesUpdate" };

    settings.Mappings.Node.Key = "ID";
    settings.Mappings.Edge.Key = "ID";
    settings.Mappings.Edge.FromKey = "FromID";
    settings.Mappings.Edge.ToKey = "ToID";

    settings.SettingsAutoLayout.Type = DevExpress.Web.ASPxDiagram.DiagramAutoLayout.Layered;
    settings.SettingsAutoLayout.Orientation = Orientation.Vertical;
}).Bind(Model.Objects, Model.Connections).GetHtml()

Run Demo: Node and Edge Data Sources View Example: How to bind the extension to in-memory data sources

Tree-Like Data Structure

If a diagram has tree-like structure, and nodes are connected by Id - Parent Id relation, bind the extension to data as follows.

• Bind the Diagram extension to a data source (Bind(Object)).
• Specify the Key and ParentKey properties that allow the Diagram extension to transform the linear structure to hierarchical.
• Optionally specify other mapping properties for shapes.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.BatchUpdateRouteValues = new { Controller = "DataBinding", Action = "LinearUpdate" };

    settings.Mappings.Node.Key = "ID";
    settings.Mappings.Node.ParentKey = "ParentID";

    settings.SettingsAutoLayout.Type = DevExpress.Web.ASPxDiagram.DiagramAutoLayout.Tree;
}).Bind(Model).GetHtml()

Run Demo: Tree from Linear Data StructureView Example: Tree from Linear Data Structure - How to bind the extension to an in-memory data source

Auto Layout

Use the SettingsAutoLayout property to specify the auto-layout algorithm and the diagram’s orientation.

If the SettingsAutoLayout.Type property is set to Auto, you can get shape coordinates from data source fields specified by the Left and Top properties.

Load and Save Diagram

You can import and export diagram data from/to a file on the server and client sides.

Note

The Diagram extension stores diagram data in its own text format. Do not modify data that the Export method returns, because a modified document may be loaded incorrectly.

Server Side

Use the Import(String) and Export() methods to load and save the diagram data in JSON format on the server side.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
}).Import(Model).GetHtml()

C#

public ActionResult DiagramView() {
    var content = System.IO.File.ReadAllText(MapPath("~/App_Data/diagram-flow.json"));
    return View("DiagramView", "DiagramView", content);
}

Client Side

Use the Import(data) and Export methods to load and save the diagram data in JSON format on the client side.

Razor

<script type="text/javascript">
    var diagramData;
</script>

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
}).GetHtml()

@Html.DevExpress().Button(settings => {
    settings.Name = "btnSave";
    settings.Text = "Save";
    settings.ClientSideEvents.Click = "function (s,e) {diagramData = Diagram.Export();}";
}).GetHtml()

@Html.DevExpress().Button(settings => {
    settings.Name = "btnLoad";
    settings.Text = "Load";
    settings.ClientSideEvents.Click = "function (s,e) {Diagram.Import(diagramData);}";
}).GetHtml()

Export to PNG, JPEG, SVG

To export a diagram, call the ExportTo(format, callback) method. Users can click Export and select the file format to download a diagram in the corresponding image format.

Collapsible Shape Containers

Use horizontal and vertical containers to arrange shapes into collapsible groups.

You can load a diagram with containers from a data source. Use the ContainerKey property to specify the name of a data source field that provides a parent container’s key. Note, the parent container node must be of the VerticalContainer or HorizontalContainer type.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.Mappings.Node.Key = "ID";
    settings.Mappings.Node.ContainerKey = "ContainerID";
    ...
}).Bind(Model).GetHtml()

Run Demo: ContainersView Example: How to bind containers to an in-memory data source

OrgChart Shapes

The Diagram extension ships with OrgChart shapes. An OrgChart shape can display an image. You can find these shapes in the Org Chart toolbox group.

When the Diagram extension is bound to a data source, use the ImageUrl property to specify the name of a field that provides a path to images.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.SettingsToolbox.Groups.Add(g => {
        g.Category = DevExpress.Web.ASPxDiagram.DiagramShapeCategory.OrgChart;
    });
    settings.Mappings.Node.Key = "ID";
    settings.Mappings.Node.Type = "Type";
    settings.Mappings.Node.Text = "Text";
    settings.Mappings.Node.ImageUrl = "Picture";
    ...
}).Bind(Model.Items, Model.Links).GetHtml()

Run Demo: OrgChart Shapes

Custom Shapes

Use the CustomShapes property to extend the collection of built-in shapes with custom shapes. To add a custom shape category to the shape toolbox, use the SettingsToolbox property.

You can create a custom shape from scratch and specify its background image, shape size, text, etc. Alternatively, you can create a custom shape based on a default shape type and customize only the required settings, for instance the shape text.

Note, the Type property identifies custom shapes, therefore it must be specified and unique.

Run Demo: Shapes with Base Type

Base Type Shapes

Use the BaseType property to specify a base type for a shape.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.SettingsToolbox.Groups.Add(g => {
        g.Category = DiagramShapeCategory.Custom;
        g.CustomCategoryName = "CategoryEmployees";
        g.Title = "Employees";
        g.DisplayMode = DiagramToolboxGroupDisplayMode.Texts;
    });
    settings.CustomShapes.AddRange(ViewBag.EmployeeShapes);
}).Import(Model).GetHtml()

C#

public ActionResult CustomTextShapes() {
    ViewBag.EmployeeShapes = GetEmployeesShapes();
    ...
}
static IEnumerable<DiagramCustomShape> GetEmployeesShapes() {
    return EmployeesDataProvider.GetCompanyEmployees()
        .Select(e => new DiagramCustomShape {
            Type = "emp" + e.EmployeeID,
            BaseType = DiagramShapeType.Rectangle,
            DefaultText = e.FirstName + " " + e.LastName,
            Category = "CategoryEmployees"
        });
}

Shapes with Custom Background Images

Use the BackgroundImageUrl property to specify a background image for a shape.

Note

Shape images should be supplied as SVG files.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.SettingsToolbox.Groups.Add(g => {
        g.Category = DevExpress.Web.ASPxDiagram.DiagramShapeCategory.Custom;
        g.CustomCategoryName = "hardware";
        g.Title = "Hardware";
    });
    settings.CustomShapes.Add(c => {
        c.Type = "internet";
        c.Category = "hardware";
        c.Title = "Internet";
        c.BackgroundImageUrl = "../Content/customshapes/shapes/internet.svg";
        c.BackgroundImageLeft = 0.15M;
        c.BackgroundImageTop = 0;
        c.BackgroundImageWidth = 0.7M;
        c.BackgroundImageHeight = 0.7M;
        c.DefaultWidth = 0.75M;
        c.DefaultHeight = 0.75M;
        c.DefaultText = "Internet";
        c.AllowEditText = true;
        c.TextLeft = 0;
        c.TextTop = 0.7M;
        c.TextWidth = 1;
        c.TextHeight = 0.3M;
        c.ConnectionPoints.Add(0.5M, 0);
        c.ConnectionPoints.Add(0.9M, 0.5M);
        c.ConnectionPoints.Add(0.5M, 1);
        c.ConnectionPoints.Add(0.1M, 0.5M);
    });
    ...
}).Import(Model).GetHtml()

Run Demo: Background Images

Templates

Handle the CustomShapeCreateTemplate event to provide a template for custom shapes. The event argument’s item property provides access to the currently processed item. Add the template content, which must be presented as SVG elements, to the container property.

JS

function onCustomShapeCreateTemplate(s, e) {
    var department = getDepartment(e.item.key);
    var svgNS = "http://www.w3.org/2000/svg"
    var svgEl = document.createElementNS(svgNS, "svg");
    svgEl.setAttribute("class", "template");
    e.container.appendChild(svgEl);
    var textEl = document.createElementNS(svgNS, "text");
    textEl.setAttribute("class", "template-name");
    textEl.setAttribute("x", "50%");
    textEl.setAttribute("y", "50%");
    textEl.textContent = department.DepartmentName;
    textEl.onclick = function () {
        var content = "<p>Department Name: <b>" + department.DepartmentName + "</b></p>" +
            "<p>Budget: <b>$" + department.Budget + "</b></p>";
        popup.SetContentHTML(content);
        popup.Show();
    };
    svgEl.appendChild(textEl);
}

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "diagram";
    settings.ClientSideEvents.CustomShapeCreateTemplate = "onCustomShapeCreateTemplate";
    ...
}).Bind(Model).GetHtml()

@Html.DevExpress().PopupControl(settings => {
    settings.Name = "popup";
    ...
}).GetHtml()

Run Demo: Templates

Simple View

Set the SimpleView option to true to enable Simple View mode. In Simple View mode, the extension does not divide the work area into pages and the diagram’s content occupies all the available area inside the extension.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.SimpleView = true;
}).Import(Model).GetHtml()

Run Demo: Simple View

Restrict Edit Operations

The Diagram allows you to restrict edit operations. To prohibit an operation, set the corresponding Allow{Operation} property to false. The RequestEditOperation event allows you to implement custom logic to determine whether an operation is allowed.

More details

Run Demo: Editing Restrictions

Read Only Mode

Set the ReadOnly property to true to prohibit edit operations.

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.ReadOnly = true;
}).Import(Model).GetHtml()

Run Demo: Read Only

Diagram Tools

The table below lists the extension tools that can be customized with the corresponding settings properties.

Tool	Settings Property
Context Toolbox	SettingsContextToolbox
Properties Panel	SettingsPropertiesPanel
Toolbox	SettingsToolbox

Razor

@Html.DevExpress().Diagram(settings => {
    settings.Name = "Diagram";
    settings.SettingsContextToolbox.CustomCategoryName = "hardware";
    settings.SettingsPropertiesPanel.Visibility = DevExpress.Web.ASPxDiagram.DiagramPanelVisibility.Visible;
    settings.SettingsToolbox.Groups.Add(g => {
        g.Category = DevExpress.Web.ASPxDiagram.DiagramShapeCategory.General;
    });
    settings.SettingsToolbox.Groups.Add(g => {
        g.Category = DevExpress.Web.ASPxDiagram.DiagramShapeCategory.Custom;
        g.CustomCategoryName = "hardware";
        g.Title = "Hardware";
    });
    settings.CustomShapes.Add(c => {
        c.Type = "internet";
        c.Category = "hardware";
        c.Title = "Internet";
        ...

}).Import(Model).GetHtml()

Examples

View Example: How to bind the extension to an in-memory data source View Example: How to bind the extension to in-memory data sources View Example: How to bind containers to an in-memory data source

Inheritance

Object

ExtensionBase

DiagramExtension