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Diagram

Advanced Data Binding

Note that the Diagram widget is in the community technology preview (CTP) development stage.

The Diagram widget accepts functions as expression property values. The widget allows you to implement custom logic when you bind a diagram to a data source. In this demo, the nodes and edges collections are bound to a data source. Custom functions are used to get different shape types and font styles for items based on additional data source information.

The autoLayout option specifies an auto-layout algorithm type and orientation that the widget uses to build diagrams.

@model DevExtreme.MVC.Demos.Models.SampleData.OrgData @(Html.DevExtreme().Diagram() .ID("diagram") .Nodes(ns => ns .DataSource(d => d .Array() .Key("this") .Data(Model.Items) ) .KeyExpr("ID") .TextExpr("Name") .TypeExpr(new JS("itemTypeExpr")) .WidthExpr(new JS("itemWidthExpr")) .HeightExpr(new JS("itemHeightExpr")) .TextStyleExpr(new JS("itemTextStyleExpr")) .StyleExpr(new JS("itemStyleExpr")) .AutoLayout(al => al .Type(DiagramDataLayoutType.Tree) .Orientation(DiagramDataLayoutOrientation.Horizontal) ) ) .Edges(ns => ns .DataSource(d => d .Array() .Key("this") .Data(Model.Links) ) .KeyExpr("ID") .FromExpr("From") .ToExpr("To") .StyleExpr(new JS("linkStyleExpr")) .FromLineEndExpr(new JS("linkFromLineEndExpr")) .ToLineEndExpr(new JS("linkToLineEndExpr")) ) .Toolbox(t => t .Groups(g => g .Add().Category(DiagramShapeCategory.General).Title("General") ) ) ) <script type="text/javascript"> function itemTypeExpr(obj, value) { if(value) obj.Type = (value === "rectangle") ? undefined : "group"; else return obj.Type === "group" ? "ellipse" : "rectangle"; } function itemWidthExpr(obj, value) { if(value) obj.Width = value; else return obj.Width || (obj.Type === "group" && 1.5) || 1; } function itemHeightExpr(obj, value) { if(value) obj.Height = value; else return obj.Height || (obj.Type === "group" && 1) || 0.75; } function itemTextStyleExpr(obj) { if(obj.Level === "senior") return { "font-weight": "bold", "text-decoration": "underline" }; return {}; } function itemStyleExpr(obj) { let style = { "stroke": "#444444" }; if(obj.Type === "group") style["fill"] = "#f3f3f3"; return style; } function linkStyleExpr(obj) { return { "stroke": "#444444" }; } function linkFromLineEndExpr(obj) { return "none"; } function linkToLineEndExpr(obj) { return "none"; } </script>
using System.Web.Mvc; using DevExtreme.MVC.Demos.Models.SampleData; namespace DevExtreme.MVC.Demos.Controllers { public class DiagramController : Controller { public ActionResult AdvancedDataBinding() { return View(new OrgData { Items = SampleData.OrgItemsAdvanced, Links = SampleData.OrgLinksAdvanced }); } } }
#diagram { height: 900px; }