Angular Diagram Methods
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beginUpdate()
Prevents the widget from refreshing until the endUpdate() method is called.
The beginUpdate() and endUpdate() methods prevent the widget from excessive updates when you are changing multiple widget settings at once. After the beginUpdate() method is called, the widget does not update its UI until the endUpdate() method is called.
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defaultOptions(rule)
defaultOptions is a static method that the widget class supports. The following code demonstrates how to specify default options for all instances of the Diagram widget in an application executed on the desktop.
- import Diagram from "devextreme/ui/diagram";
- // ...
- export class AppComponent {
- constructor () {
- Diagram.defaultOptions({
- device: { deviceType: "desktop" },
- options: {
- // Here go the Diagram options
- }
- });
- }
- }
dispose()
After calling this method, remove the DOM element associated with the widget:
- <dx-diagram #diagramVar id="myDiagram"></dx-diagram>
- import { ..., ViewChild } from "@angular/core";
- import { DxDiagramComponent } from "devextreme-angular";
- // ...
- export class AppComponent {
- @ViewChild("diagramVar", { static: false }) diagram: DxDiagramComponent;
- // Prior to Angular 8
- // @ViewChild("diagramVar") diagram: DxDiagramComponent;
- removeDiagram (e) {
- this.diagram.instance.dispose();
- document.getElementById("myDiagram").remove();
- }
- }
element()
An HTML element or a jQuery element when you use jQuery.
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endUpdate()
Refreshes the widget after a call of the beginUpdate() method.
Main article: beginUpdate()
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focus()
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getData()
The getData method allows you to save information about a diagram's layout, appearance, and the diagram's shape positions. You can call the setData method to save this data and load it on demand.
getInstance(element)
getInstance is a static method that the widget class supports. The following code demonstrates how to get the Diagram instance found in an element with the myDiagram
ID:
- // Modular approach
- import Diagram from "devextreme/ui/diagram";
- ...
- let element = document.getElementById("myDiagram");
- let instance = Diagram.getInstance(element) as Diagram;
- // Non-modular approach
- let element = document.getElementById("myDiagram");
- let instance = DevExpress.ui.dxDiagram.getInstance(element);
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instance()
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off(eventName)
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off(eventName, eventHandler)
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on(eventName, eventHandler)
Use this method to subscribe to one of the events listed in the Events section.
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on(events)
Use this method to subscribe to several events with one method call. Available events are listed in the Events section.
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- Handle Events: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option()
Gets all widget options.
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option(optionName)
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option(optionName, optionValue)
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
option(options)
See Also
- Get and Set Options
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
registerKeyHandler(key, handler)
A handler. Accepts the keydown event as the argument. It is a dxEvent or a jQuery.Event when you use jQuery.
The key argument accepts one of the following values:
- "backspace"
- "tab"
- "enter"
- "escape"
- "pageUp"
- "pageDown"
- "end"
- "home"
- "leftArrow"
- "upArrow"
- "rightArrow"
- "downArrow"
- "del"
- "space"
- "F"
- "A"
- "asterisk"
- "minus"
A custom handler for a key cancels the default handler for this key.
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repaint()
See Also
- reload() in DataSource | List
- refresh() in DataGrid | TreeList
- Call Methods: Angular | Vue | React | jQuery | AngularJS | Knockout | ASP.NET MVC 5 | ASP.NET Core
setData(data, updateExistingItemsOnly)
The getData method allows you to save information about a diagram's layout, appearance, and the diagram's shape positions. Use the setData method to load this data on demand.
If you have technical questions, please create a support ticket in the DevExpress Support Center.