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Diagram

Editing Restrictions

The Diagram widget allows you to restrict edit operations. To prohibit an operation, set the corresponding option in the editing property to false.

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

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$(function() { function showToast(text) { DevExpress.ui.notify({ position: { at: "top", my: "top", of: "#diagram", offset: "0 4" }, message: text, type: "warning", delayTime: 2000 }); } $("#diagram").dxDiagram({ customShapes: [{ category: "items", type: "root", baseType: "octagon", defaultText: "Development" }, { category: "items", type: "team", title: "Team", baseType: "ellipse", defaultText: "Team Name" }, { category: "items", type: "employee", title: "Employee", baseType: "rectangle", defaultText: "Employee Name" }], nodes: { dataSource: new DevExpress.data.ArrayStore({ key: "ID", data: orgItems }), keyExpr: "ID", textExpr: "Name", typeExpr: "Type", parentKeyExpr: "ParentID", autoLayout: { type: "tree" } }, onRequestLayoutUpdate: function(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; } }, onRequestEditOperation: function(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 children = orgItems.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; } }, contextToolbox: { shapeIconsPerRow: 2, width: 100, shapes: [ "team", "employee" ] }, toolbox: { shapeIconsPerRow: 2, groups: [ { title: "Items", shapes: [ "team", "employee" ] } ] }, propertiesPanel: { visibility: "disabled" } }); });
<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>DevExtreme Demo</title> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" /> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script> <script src="https://cdn3.devexpress.com/jslib/20.2.3/js/dx-diagram.min.js"></script> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.3/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.3/css/dx.light.css" /> <link rel="stylesheet" href="https://cdn3.devexpress.com/jslib/20.2.3/css/dx-diagram.css" /> <script src="https://cdn3.devexpress.com/jslib/20.2.3/js/dx.all.js"></script> <link rel="stylesheet" type="text/css" href="styles.css" /> <script src="data.js"></script> <script src="index.js"></script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="diagram"> </div> </div> </body> </html>
#diagram { height: 600px; }
var orgItems = [ { "ID":"106", "Name":"Development", "Type":"root" }, { "ID":"107", "Name":"WinForms Team", "Type": "team", "ParentID": "106" }, { "ID":"109", "Name":"Javascript Team", "Type": "team", "ParentID": "106" }, { "ID":"110", "Name":"ASP.NET Team", "Type": "team", "ParentID": "106" }, { "ID":"112", "Name": "Ana Trujillo", "Type": "employee", "ParentID": "107" }, { "ID":"113", "Name":"Antonio Moreno", "Type": "employee", "ParentID": "107" }, { "ID":"115", "Name":"Christina Berglund", "Type": "employee", "ParentID": "109" }, { "ID":"116", "Name":"Hanna Moos", "Type": "employee", "ParentID": "109" }, { "ID":"119", "Name":"Laurence Lebihan", "Type": "employee", "ParentID": "110" }, { "ID":"122", "Name": "Patricio Simpson", "Type": "employee", "ParentID": "110" }, { "ID":"123", "Name":"Francisco Chang", "Type": "employee", "ParentID": "110" } ];