D3.js is a powerful JavaScript library that can be used to create interactive visualizations on the web. It also has the ability to implement drag and drop functionality.

I am trying to drag SVG element using d3.js. but it gives and stated "Cannot read property 'drag' of undefined" my code is given below. <script src="https://d3js.org ...

…and is actually really useful for Web developers wanting to implement drag and drop functionality in a quick and elegant way. You can get it on GitHub.