To simulate mouse events the buttons below use the Robot class that is defined in Robot.js.

Click these buttons in order from top to bottom:

Clicking operations:

Panning operation:

The UndoManager has been enabled in the main Diagram. Give focus to the Diagram and you can undo everything and then redo everything to confirm what was executed by the Robot.

### GoJS Features in this sample

#### Collections

GoJS provides its own collection classes: List, Set, and Map. You can iterate over a collection by using an Iterator. More information can be found in the GoJS Intro.

Related samples

#### Context Menus

A GoJS context menu is an Adornment that is shown when the user context-clicks (right mouse click or long touch hold) an object that has its GraphObject.contextMenu set. The context menu is bound to the same data as the part itself.

It is typical to implement a context menu as a "ContextMenu" Panel containing "ContextMenuButton"s, as you can see in the code below in the assignment of the Node's GraphObject.contextMenu and Diagram.contextMenu properties. Each "ContextMenu" is just a "Vertical" Panel Adornment that is shadowed. Each "ContextMenuButton" is a Panel on which you can set the GraphObject.click event handler. In the event handler `obj.part` will be the whole context menu Adornment. `obj.part.adornedPart` will be the adorned Node or Link. The bound data is `obj.part.data`, which will be the same as `obj.part.adornedPart.data`.

More information can be found in the GoJS Intro.

Related samples

#### Palette

A Palette is a subclass of Diagram that is used to display a number of Parts that can be dragged into the diagram that is being modified by the user. The initialization of a Palette is just like the initialization of any Diagram. Like Diagrams, you can have more than one Palette on the page at the same time.

More information can be found in the GoJS Intro.

Related samples

#### Buttons

GoJS defines several Panels for common uses. These include "Button", "TreeExpanderButton", "SubGraphExpanderButton", "PanelExpanderButton", "ContextMenuButton", and "CheckBoxButton". "ContextMenuButton"s are typically used inside of "ContextMenu" Panels; "CheckBoxButton"s are used in the implementation of "CheckBox" Panels.

These predefined panels can be used as if they were Panel-derived classes in calls to GraphObject.make. They are implemented as simple visual trees of GraphObjects in Panels, with pre-set properties and event handlers.

More information can be found in the GoJS Intro.

Related samples

#### GoJS Extensions

GoJS can be extended in a variety of ways. The most common way to change the standard behavior is to set properties on the GraphObject, Diagram, CommandHandler, Tool, or Layout. But when the desired property does not exist, you might need to override methods of CommandHandler, Tool, Layout, Link, or Node. Methods that you can override are documented in the API reference. Various features of GoJS can be overriden, either by replacing a method on an instance (a feature of JavaScript) or by defining a subclass. You should not modify the prototypes of any of the GoJS classes.

In addition to our samples, GoJS provides an extensions gallery, showcasing the creation of custom tools and layouts. Those classes and samples are written in TypeScript, available at `../extensionsJSM/`, as ECMAScript/JavaScript modules -- these use the `../release/go-module.js` library. We recommend that you copy the files that you need into your project, so that you can adjust how they refer to the GoJS library that you choose and so that you can include them into your own building and packaging procedures.

More information can be found in the GoJS Intro.

Related samples

#### HTML Interaction

GoJS Diagrams can be used alongside other HTML elements in a webapp. For custom Text Editors, Context Menus, and ToolTips, which are invoked and hidden via GoJS tool operations, it is best to use the HTMLInfo class.

More information can be found in the GoJS Intro.

Related samples