Angular Diagram - Getting Started

The Diagram UI component provides a visual interface to help you design new and modify existing diagrams.

View Demo

Add diagram resources (scripts and styles) onto the page.

• npm

  The devexpress-diagram is a dependency of the DevExtreme package. Therefore, install the DevExtreme npm package to include the Diagram in your project. Then, add the dx-diagram.min.css and dx-diagram.min.js files to your page.

  HTML

  <link rel="stylesheet" href="node_modules/devexpress-diagram/dx-diagram.min.css">
  <script type="text/javascript" src="node_modules/devexpress-diagram/dx-diagram.min.js"></script>

• CDN

  Add the dx-diagram.min.css and dx-diagram.min.js files to your page.

  HTML

  <link rel="stylesheet" href="https://cdn3.devexpress.com/jslib/21.1.11/css/dx-diagram.min.css">
  <script src="https://cdn3.devexpress.com/jslib/21.1.11/js/dx-diagram.min.js"></script>

• Local Scripts

  You can find all the required files in the DevExtreme zip archive or DevExtreme folder (%ProgramFiles(x86)%\DevExpress 21.1\DevExtreme\Sources). Copy the dx-diagram.min.js and dx-diagram.min.css files into your application folder. Then, link the required files.

  HTML

  <script type="text/javascript" src="js/dx-diagram.min.js"></script>
  <link rel="stylesheet" href="css/dx-diagram.min.css">

Use the the dx-diagram.css and dx-diagram.js files to add an unminified version of the resource files to your page.

    @* Diagram styles*@
    <link rel="stylesheet" href="https://cdn3.devexpress.com/jslib/21.1.11/css/dx-diagram.min.css">
    @* DevExtreme theme *@
    <link rel="stylesheet" href="https://cdn3.devexpress.com/jslib/21.1.11/css/dx.light.css">

    @* jQuery *@
    <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
    @* Diagram scripts *@
    <script type="text/javascript" src="https://cdn3.devexpress.com/jslib/21.1.11/js/dx-diagram.min.js"></script>
    @* DevExtreme common scripts *@
    <script type="text/javascript" src="https://cdn3.devexpress.com/jslib/21.1.11/js/dx.all.js"></script>

Initialize the Diagram UI component in a DOM element.

    $(function() {
        $("#diagram").dxDiagram();
    });

    <div id="diagram"></div>

This tutorial adds the Diagram component to an Angular CLI Application. Refer to the Angular CLI documentation for information on how to create such an application.

Install the devextreme and devextreme-angular npm packages:

`npm install devextreme@21.1.4 devextreme-angular@21.1.4 --save --save-exact`

Open the angular.json file and reference the Diagram and a predefined theme stylesheet (dx.light.css in the code below):

"styles": [
    ...
    "node_modules/devexpress-diagram/dist/dx-diagram.min.css",
    "node_modules/devextreme/dist/css/dx.light.css"
]

Go to the NgModule and import the Diagram module.

// Imports the Diagram component
import { DxDiagramModule } from 'devextreme-angular'; 

@NgModule({ 
    // ... 
    imports: [
        // ...
        DxDiagramModule
    ] 
})

Now you can use the Diagram component in your application:

<dx-diagram></dx-diagram>

Run the application with the following command:

`ng serve`

Open http://localhost:4200/ to browse the application.

To load and save a diagram to a string variable, use the import and export methods.

var diagram = $("#diagram").dxDiagram("instance");
var diagramContent = diagram.export(); // load diagram content to a variable
diagram.import(newDiagramContent); // replace the existing diagram with a new diagram