Creating the View

How to create a basic view.

This step introduces class GraphComponent, which is the central UI element for working with graphs. The app does not provide any interactive features except basic navigation and selection, which is enabled by default. It is merely meant as a very basic example of how to display a GraphComponent within a web page.

This is the minimal code that’s needed to display a graph on a web page using yFiles for HTML.

First we make sure that there is a div element on the HTML page in the document. It will host the graph component visualization.

<div id="graphComponent"></div>

We should also make sure that the div actually has a reasonable size, as the default style will only set a min-width and min-height to 100px. We can do this via CSS, but any technique that assigns a positive size to the element would work:

#graphComponent {
  width: 100%;
  height: 100%;
  background-color: white;
}

Now, in the code we can initialize the GraphComponent and wire it up with the existing div.

// create a new graph component in the div element specified via the CSS selector
const graphComponent = new GraphComponent('#graphComponent')

And just to make this a little less boring and so that we can see something in the view, we add a node with a label and center it in the view. This, of course, is purely optional.

// create a single node as an example
const node = graphComponent.graph.createNode()
// and add a label
graphComponent.graph.addLabel(node, 'y')
// then center the graph in the component
await graphComponent.fitGraphBounds()

Note

The yFiles demo and tutorial applications use additional scripts and CSS (demo-ui) to reduce the amount of boilerplate code that is needed to get a good-looking demo app that shows the relevant features. All code samples included in this distribution can be implemented using plain HTML and TypeScript/JavaScript together with yFiles for HTML.

For a minimal example of using yFiles for HTML to display a graph on a web page, please take a look at the Basic Demo Demo.

App Generator

Alternatively, you may use the App Generator to create visualization prototypes – quickly and easily. It will allow you to scaffold a working code example using your preferred UI framework (React, Vue, Angular, Plain, etc.)

02 Creating Graph Elements