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Editing Restrictions
Our Diagram UI 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.
Feel free to share demo-related thoughts here.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
If you have technical questions, please create a support ticket in the DevExpress Support Center.
Thank you!
We appreciate your feedback.
We appreciate your feedback.
<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'"
>
<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>
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.js';
export default {
components: {
DxDiagram, DxCustomShape, DxNodes, DxAutoLayout, DxContextToolbox, DxToolbox, DxPropertiesPanel, DxGroup
},
data() {
return {
orgItemsDataSource: new ArrayStore({
key: 'ID',
data: service.getOrgItems()
})
};
},
methods: {
showToast(text) {
notify({
position: { at: 'top', my: 'top', of: '#diagram', offset: '0 4' },
message: text,
type: 'warning',
delayTime: 2000
});
},
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;
}
}
},
onRequestEditOperation(e) {
var diagram = this.$refs['diagram'].instance;
var i;
if(e.operation === 'addShape') {
if(e.args.shape.type !== 'employee' && e.args.shape.type !== 'team') {
if(e.reason !== 'checkUIElementAvailability') {
this.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') {
this.showToast('You cannot delete the \'Development\' shape.');
}
e.allowed = false;
}
if(e.args.shape.type === 'team') {
for(i = 0; i < e.args.shape.attachedConnectorIds.length; i++) {
if(diagram.getItemById(e.args.shape.attachedConnectorIds[i]).toId != e.args.shape.id) {
if(e.reason !== 'checkUIElementAvailability') {
this.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') {
this.showToast('The shape size is too small.');
}
e.allowed = false;
}
}
else if(e.operation === 'changeConnection') {
var shapeType = e.args.newShape && e.args.newShape.type;
if(shapeType === 'root' && e.args.connectorPosition === 'end') {
if(e.reason !== 'checkUIElementAvailability') {
this.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') {
this.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') {
this.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') {
this.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>
import { createApp } from 'vue';
import App from './App.vue';
createApp(App).mount('#app');
<!DOCTYPE html>
<html>
<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/20.2.5/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.5/css/dx.light.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/20.2.5/css/dx-diagram.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/core-js@2.4.1/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.js');
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app">
</div>
</div>
</body>
</html>
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'
}];
export default {
getOrgItems() {
return orgItems;
}
};
System.config({
transpiler: 'plugin-babel',
meta: {
'*.vue': {
loader: 'vue-loader'
},
'devextreme/localization.js': {
"esModule": true
},
},
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
'vue': 'npm:vue@3.0.0/dist/vue.esm-browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@1.0.15/index.js',
'mitt': 'npm:mitt/dist/mitt.umd.js',
'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@20.2.5',
'devextreme-vue': 'npm:devextreme-vue@20.2.5',
'jszip': 'npm:jszip@3.5.0/dist/jszip.min.js',
'devextreme-quill': 'npm:devextreme-quill@0.9.8/dist/dx-quill.min.js',
'devexpress-diagram': 'npm:devexpress-diagram@2.0.11/dist/dx-diagram.js',
'devexpress-gantt': 'npm:devexpress-gantt@2.0.18/dist/dx-gantt.js',
'preact': 'npm:preact@10.5.11/dist/preact.js',
'preact/hooks': 'npm:preact@10.5.11/hooks/dist/hooks.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'
},
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'
}
},
babelOptions: {
sourceMaps: false,
stage0: true
}
});