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Editing Restrictions

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

In this demo, the onRequestEditOperation function implements complex logic to determine whether an operation is allowed. The reason 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.

Backend API
<template> <DxDiagram id="diagram" ref="diagram" @request-edit-operation="onRequestEditOperation" @request-layout-update="onRequestLayoutUpdate" > <DxCustomShape :category="'items'" :type="'root'" :base-type="'octagon'" :default-text="'Development'" /> <DxCustomShape :category="'items'" :type="'team'" :base-type="'ellipse'" :title="'Team'" :default-text="'Team Name'" /> <DxCustomShape :category="'items'" :type="'employee'" :base-type="'rectangle'" :title="'Employee'" :default-text="'Employee Name'" /> <DxNodes :data-source="orgItemsDataSource" :key-expr="'ID'" :text-expr="'Name'" :type-expr="'Type'" :parent-key-expr="'ParentID'" :style-expr="itemStyleExpr" > <DxAutoLayout :type="'tree'" /> </DxNodes> <DxContextToolbox :shape-icons-per-row="2" :width="100" :shapes="['team', 'employee']" /> <DxToolbox :shape-icons-per-row="2" > <DxGroup :title="'Items'" :shapes="['team', 'employee']" /> </DxToolbox> <DxPropertiesPanel :visibility="'disabled'" /> </DxDiagram> </template> <script setup lang="ts"> import { ref } from 'vue'; import { DxDiagram, DxCustomShape, DxNodes, DxAutoLayout, DxContextToolbox, DxToolbox, DxPropertiesPanel, DxGroup, } from 'devextreme-vue/diagram'; import notify from 'devextreme/ui/notify'; import ArrayStore from 'devextreme/data/array_store'; import service from './data.ts'; const orgItemsDataSource = new ArrayStore({ key: 'ID', data: service.getOrgItems(), }); const diagram = ref(); const itemStyleExpr = ({ Type }) => ({ fill: { root: '#ffcfc3', team: '#b7e3fe', }[Type] || '#bbefcb', } ); function showToast(text) { notify({ position: { at: 'top', my: 'top', of: '#diagram', offset: '0 4', }, message: text, type: 'warning', delayTime: 2000, }); } function onRequestLayoutUpdate(e) { for (let i = 0; i < e.changes.length; i += 1) { 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) { let i; if (e.operation === 'addShape') { if (e.args.shape.type !== 'employee' && e.args.shape.type !== 'team') { if (e.reason !== 'checkUIElementAvailability') { showToast('You can add only a \'Team\' or \'Employee\' shape.'); } e.allowed = false; } } else if (e.operation === 'deleteShape') { if (e.args.shape.type === 'root') { if (e.reason !== 'checkUIElementAvailability') { showToast('You cannot delete the \'Development\' shape.'); } e.allowed = false; } if (e.args.shape.type === 'team') { const connectorIds = e.args.shape.attachedConnectorIds; for (i = 0; i < connectorIds.length; i += 1) { if (diagram.value.instance.getItemById(connectorIds[i]).toId !== e.args.shape.id) { if (e.reason !== 'checkUIElementAvailability') { showToast('You cannot delete a \'Team\' shape that has a child shape.'); } e.allowed = false; break; } } } } else if (e.operation === 'resizeShape') { if (e.args.newSize.width < 1 || e.args.newSize.height < 0.75) { if (e.reason !== 'checkUIElementAvailability') { showToast('The shape size is too small.'); } e.allowed = false; } } else if (e.operation === 'changeConnection') { const shapeType = e.args.newShape && e.args.newShape.type; if (shapeType === 'root' && e.args.connectorPosition === 'end') { if (e.reason !== 'checkUIElementAvailability') { showToast('The \'Development\' shape cannot have an incoming connection.'); } e.allowed = false; } if (shapeType === 'employee' && e.args.connectorPosition === 'start') { e.allowed = false; } } else if (e.operation === 'changeConnectorPoints') { if (e.args.newPoints.length > 2) { if (e.reason !== 'checkUIElementAvailability') { showToast('You cannot add points to a connector.'); } e.allowed = false; } } else if (e.operation === 'beforeChangeShapeText') { if (e.args.shape.type === 'root') { if (e.reason !== 'checkUIElementAvailability') { showToast('You cannot change the \'Development\' shape\'s text.'); } e.allowed = false; } } else if (e.operation === 'changeShapeText') { if (e.args.text === '') { if (e.reason !== 'checkUIElementAvailability') { showToast('A shape text cannot be empty.'); } e.allowed = false; } } else if (e.operation === 'beforeChangeConnectorText') { e.allowed = false; } } </script> <style scoped> #diagram { height: 600px; } </style>
window.exports = window.exports || {}; window.config = { transpiler: 'plugin-babel', meta: { '*.vue': { loader: 'vue-loader', }, '*.ts': { loader: 'demo-ts-loader', }, '*.svg': { loader: 'svg-loader', }, 'devextreme/time_zone_utils.js': { 'esModule': true, }, 'devextreme/localization.js': { 'esModule': true, }, 'devextreme/viz/palette.js': { 'esModule': true, }, }, paths: { 'root:': '../../../../', 'npm:': 'https://unpkg.com/', }, map: { 'vue': 'npm:vue@3.2.47/dist/vue.esm-browser.js', 'vue-loader': 'npm:dx-systemjs-vue-browser@1.1.1/index.js', 'demo-ts-loader': 'root:utils/demo-ts-loader.js', 'svg-loader': 'root:utils/svg-loader.js', 'mitt': 'npm:mitt/dist/mitt.umd.js', 'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js', 'luxon': 'npm:luxon@1.28.1/build/global/luxon.min.js', 'es6-object-assign': 'npm:es6-object-assign@1.1.0', 'devextreme': 'npm:devextreme@24.1.4/cjs', 'devextreme-vue': 'npm:devextreme-vue@24.1.4/cjs', 'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js', 'devextreme-quill': 'npm:devextreme-quill@1.7.1/dist/dx-quill.min.js', 'devexpress-diagram': 'npm:devexpress-diagram@2.2.10/dist/dx-diagram.js', 'devexpress-gantt': 'npm:devexpress-gantt@4.1.56/dist/dx-gantt.js', '@devextreme/runtime': 'npm:@devextreme/runtime@3.0.13', 'inferno': 'npm:inferno@7.4.11/dist/inferno.min.js', 'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js', 'inferno-create-element': 'npm:inferno-create-element@7.4.11/dist/inferno-create-element.min.js', 'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js', 'inferno-hydrate': 'npm:inferno-hydrate@7.4.11/dist/inferno-hydrate.min.js', 'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js', 'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js', 'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js', 'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js', 'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js', // Prettier 'prettier/standalone': 'npm:prettier@2.8.8/standalone.js', 'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js', }, packages: { 'devextreme-vue': { main: 'index.js', }, 'devextreme': { defaultExtension: 'js', }, 'devextreme/events/utils': { main: 'index', }, 'devextreme/events': { main: 'index', }, 'es6-object-assign': { main: './index.js', defaultExtension: 'js', }, }, packageConfigPaths: [ 'npm:@devextreme/*/package.json', 'npm:@devextreme/runtime@3.0.13/inferno/package.json', ], babelOptions: { sourceMaps: false, stage0: true, }, }; System.config(window.config);
const 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', }]; export default { getOrgItems() { return orgItems; }, };
import { createApp } from 'vue'; import App from './App.vue'; createApp(App).mount('#app');
<!DOCTYPE html> <html lang="en"> <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=5.0" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.4/css/dx-diagram.min.css" /> <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/24.1.4/css/dx.light.css" /> <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" /> <script src="https://unpkg.com/typescript@4.9.5/lib/typescript.js"></script> <script type="module"> import * as vueCompilerSFC from "https://unpkg.com/@vue/compiler-sfc@3.4.16/dist/compiler-sfc.esm-browser.js"; window.vueCompilerSFC = vueCompilerSFC; </script> <script src="https://unpkg.com/core-js@2.6.12/client/shim.min.js"></script> <script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script> <script type="text/javascript" src="config.js"></script> <script type="text/javascript"> System.import("./index.ts"); </script> </head> <body class="dx-viewport"> <div class="demo-container"> <div id="app"> </div> </div> </body> </html>