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Diagram

Editing Restrictions

Our Diagram widget allows you to restrict edit operations as needed. To prohibit a specific operation, set its corresponding option within the editing property to false.

In this demo, the onRequestEditOperation function implements complex logic to determine whether an operation is allowed. The updateUI event parameter indicates whether the event is raised by a user action or via a UI update. If a user tries to perform a prohibited action, an error message is displayed.

@(Html.DevExtreme().Diagram() .ID("diagram") .OnRequestEditOperation("onRequestEditOperation") .OnRequestLayoutUpdate("onRequestLayoutUpdate") .CustomShapes(cs => { cs.Add().Category("items").Type("root").BaseType("octagon").DefaultText("Development"); cs.Add().Category("items").Type("team").BaseType("ellipse").Title("Team").DefaultText("Team Name"); cs.Add().Category("items").Type("employee").BaseType("rectangle").Title("Employee").DefaultText("Employee Name"); }) .Nodes(ns => ns .DataSource(d => d .Array() .Key("ID") .Data(Model) ) .KeyExpr("ID") .TextExpr("Name") .TypeExpr("Type") .ParentKeyExpr("ParentID") .AutoLayout(al => al .Type(DiagramDataLayoutType.Tree) ) ) .ContextToolbox(t => t .ShapeIconsPerRow(2) .Width(100) .Shapes(new[] { "team", "employee" }) ) .Toolbox(t => t .ShapeIconsPerRow(2) .Groups(g => g .Add().Title("Items").Shapes(new[] { "team", "employee" }) ) ) .PropertiesPanel(pp => pp .Visibility(DiagramPanelVisibility.Disabled) ) ) <script type="text/javascript"> function showToast(text) { DevExpress.ui.notify({ position: { at: "top", my: "top", of: "#diagram", offset: "0 4" }, message: text, type: "warning", delayTime: 2000 }); } function onRequestLayoutUpdate(e) { for(var i = 0; i < e.changes.length; i++) { if(e.changes[i].type === 'remove') e.allowed = true; else if(e.changes[i].data.ParentID !== undefined && e.changes[i].data.ParentID !== null) e.allowed = true; } } function onRequestEditOperation(e) { var dataItem; if(e.operation === "addShape") { if(e.args.shape.type !== "employee" && e.args.shape.type !== "team") { !e.updateUI && showToast("You can add only a 'Team' or 'Employee' shape."); e.allowed = false; } } else if(e.operation === "deleteShape") { dataItem = e.args.shape && e.args.shape.dataItem; if(dataItem && dataItem.Type === "root") { !e.updateUI && showToast("You cannot delete the 'Development' shape."); e.allowed = false; } if(dataItem && dataItem.Type === "team") { var diagram = $("#diagram").dxDiagram("instance"); var children = diagram.getNodeDataSource().items().filter(function(item) { return item.ParentID === dataItem.ID; }); if(children.length > 0) { !e.updateUI && showToast("You cannot delete a 'Team' shape that has a child shape."); e.allowed = false; } } } else if(e.operation === "resizeShape") { if(e.args.newSize.width < 1 || e.args.newSize.height < 0.75) { !e.updateUI && showToast("The shape size is too small."); e.allowed = false; } } else if(e.operation === "changeConnection") { dataItem = e.args.newShape && e.args.newShape.dataItem; if(dataItem && dataItem.Type === "root" && e.args.connectorPosition === "end") { !e.updateUI && showToast("The 'Development' shape cannot have an incoming connection."); e.allowed = false; } if(dataItem && dataItem.Type === "team" && e.args.connectorPosition === "end") { if(dataItem && dataItem.ParentID !== undefined && dataItem.ParentID !== null) { !e.updateUI && showToast("A 'Team' shape can have only one incoming connection."); e.allowed = false; } } if(dataItem && dataItem.Type === "employee") { if(e.args.connectorPosition === "start") e.allowed = false; if(e.args.connectorPosition === "end" && dataItem.ParentID !== undefined && dataItem.ParentID !== null) { !e.updateUI && showToast("An 'Employee' shape can have only one incoming connection."); e.allowed = false; } } } else if(e.operation === "changeConnectorPoints") { if(e.args.newPoints.length > 2) { !e.updateUI && showToast("You cannot add points to a connector."); e.allowed = false; } } else if(e.operation === "beforeChangeShapeText") { dataItem = e.args.shape && e.args.shape.dataItem; if(dataItem && dataItem.Type === "root") { !e.updateUI && showToast("You cannot change the 'Development' shape's text."); e.allowed = false; } } else if(e.operation === "changeShapeText") { if(e.args.text === "") { !e.updateUI && showToast("A shape text cannot be empty."); e.allowed = false; } } else if(e.operation === "beforeChangeConnectorText") { e.allowed = false; } } </script>
using DevExtreme.NETCore.Demos.Models.SampleData; using Microsoft.AspNetCore.Mvc; namespace DevExtreme.NETCore.Demos.Controllers { public class DiagramController : Controller { public IActionResult OperationRestrictions() { return View(SampleData.OrgItemsRestrictions); } } }
#diagram { height: 600px; }