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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.

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<dx-diagram #diagram id="diagram" (onRequestEditOperation)="requestEditOperationHandler($event)" (onRequestLayoutUpdate)="requestLayoutUpdateHandler($event)"> <dxi-custom-shape category="items" [type]="'root'" baseType="octagon" [defaultText]="'Development'"> </dxi-custom-shape> <dxi-custom-shape category="items" [type]="'team'" [title]="'Team'" baseType="ellipse" [defaultText]="'Team Name'"> </dxi-custom-shape> <dxi-custom-shape category="items" [type]="'employee'" [title]="'Employee'" baseType="rectangle" [defaultText]="'Employee Name'"> </dxi-custom-shape> <dxo-nodes [dataSource]="orgItemsDataSource" keyExpr="ID" typeExpr="Type" textExpr="Name" parentKeyExpr="ParentID"> <dxo-auto-layout type="tree"></dxo-auto-layout> </dxo-nodes> <dxo-context-toolbox [width]="100" [shapeIconsPerRow]="2" [shapes]="['team', 'employee']"> <dxi-group category="general" title="General"></dxi-group> </dxo-context-toolbox> <dxo-toolbox [shapeIconsPerRow]="2"> <dxi-group title="Items" [shapes]="['team', 'employee']"></dxi-group> </dxo-toolbox> <dxo-properties-panel visibility="disabled"> </dxo-properties-panel> </dx-diagram>
import { NgModule, Component, ViewChild, enableProdMode } from '@angular/core'; import { BrowserModule } from '@angular/platform-browser'; import { platformBrowserDynamic } from '@angular/platform-browser-dynamic'; import { HttpClient, HttpClientModule } from '@angular/common/http'; import { DxDiagramModule, DxDiagramComponent } from 'devextreme-angular'; import notify from 'devextreme/ui/notify'; import { Service } from './app.service'; import ArrayStore from 'devextreme/data/array_store' if(!/localhost/.test(document.location.host)) { enableProdMode(); } @Component({ selector: 'demo-app', templateUrl: 'app/app.component.html', styleUrls: ['app/app.component.css'], providers: [Service], preserveWhitespaces: true }) export class AppComponent { items: any[]; orgItemsDataSource: ArrayStore; constructor(service: Service) { this.items = service.getOrgItems(); this.orgItemsDataSource = new ArrayStore({ key: "ID", data: this.items }); } showToast(text) { notify({ position: { at: "top", my: "top", of: "#diagram", offset: "0 4" }, message: text, type: "warning", delayTime: 2000 }); } requestLayoutUpdateHandler(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; } } requestEditOperationHandler(e) { var dataItem; if(e.operation === "addShape") { if(e.args.shape.type !== "employee" && e.args.shape.type !== "team") { !e.updateUI && this.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 && this.showToast("You cannot delete the 'Development' shape."); e.allowed = false; } if(dataItem && dataItem.Type === "team") { var children = this.items.filter(function(item) { return item.ParentID === dataItem.ID; }); if(children.length > 0) { !e.updateUI && this.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 && this.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 && this.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 && this.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 && this.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 && this.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 && this.showToast("You cannot change the 'Development' shape's text."); e.allowed = false; } } else if(e.operation === "changeShapeText") { if(e.args.text === "") { !e.updateUI && this.showToast("A shape text cannot be empty."); e.allowed = false; } } else if(e.operation === "beforeChangeConnectorText") { e.allowed = false; } } } @NgModule({ imports: [ BrowserModule, HttpClientModule, DxDiagramModule ], declarations: [AppComponent], bootstrap: [AppComponent] }) export class AppModule { } platformBrowserDynamic().bootstrapModule(AppModule);
::ng-deep #diagram { height: 600px; }
import { Injectable } from '@angular/core'; export class OrgItem { ID: string; Name: string; Type?: string; ParentID?: string; } let orgItems: OrgItem[] = [ { "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" } ]; @Injectable() export class Service { getOrgItems() { return orgItems; } }
// In real applications, you should not transpile code in the browser. You can see how to create your own application with Angular and DevExtreme here: // https://js.devexpress.com/Documentation/Guide/Angular_Components/Getting_Started/Create_a_DevExtreme_Application/ System.config({ transpiler: 'ts', typescriptOptions: { module: "system", emitDecoratorMetadata: true, experimentalDecorators: true }, meta: { 'typescript': { "exports": "ts" }, 'devextreme/localization.js': { "esModule": true } }, paths: { 'npm:': 'https://unpkg.com/' }, map: { 'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js', 'typescript': 'npm:typescript@3.5.3/lib/typescript.js', '@angular': 'npm:@angular', 'tslib': 'npm:tslib@2.0.3/tslib.js', 'rxjs': 'npm:rxjs@6.3.3', 'rrule': 'npm:rrule@2.6.6/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.25.0/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@20.2.4', 'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@0.9.7/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.0.5', 'devexpress-gantt': 'npm:devexpress-gantt@2.0.8', 'devextreme-angular': 'npm:devextreme-angular@20.2.4', 'preact': 'npm:preact@10.5.7/dist/preact.js', 'preact/hooks': 'npm:preact@10.5.7/hooks/dist/hooks.js' }, packages: { 'app': { main: './app.component.ts', defaultExtension: 'ts' }, 'devextreme': { defaultExtension: 'js' }, 'devextreme/events/utils': { main: 'index' }, 'devextreme/events': { main: 'index' }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js' } }, packageConfigPaths: [ "npm:@angular/*/package.json", "npm:@angular/common/*/package.json", "npm:rxjs/package.json", "npm:rxjs/operators/package.json", "npm:devextreme-angular/*/package.json", "npm:devextreme-angular/ui/*/package.json", "npm:devextreme-angular/package.json", "npm:devexpress-diagram/package.json", "npm:devexpress-gantt/package.json", ] });
<!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" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.4/css/dx.common.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.4/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.4/css/dx-diagram.css" /> <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script> <script src="https://unpkg.com/zone.js@0.10.2/dist/zone.js"></script> <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script src="config.js"></script> <script> System.import('app').catch(console.error.bind(console)); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <demo-app>Loading...</demo-app> </div> </body> </html>