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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
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Layout and position the graph - done by the Simulator, which uses a d3-force library to simulate physical forces on particles. It supports the main thread simulation and offloaded simulation using WebWorkers for a performance boost.
Currently, Orb comes with two different views to use: DefaultView and MapView. DefaultView is, as the name suggests, a default view where the graph is rendered on a blank canvas. MapView, on the other hand, renders a graph on top of the map background where each node needs to have a geo position (latitude and longitude). MapView uses Leaflet which is the leading open-source JavaScript library for interactive maps.
Orb Events is an implementation of the in-browser EventEmitter that offers several events (e.g. node/edge clicked, render started/ended, node dragged, etc.). You can subscribe to those events and do any action on top of them. A full list of events that the Orb emits can be found here.