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    Interact.js

    Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
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    interact.js

    JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE9+).

    Gitter jsDelivr Build Status Maintainability Test Coverage

    Features include:

    • inertia and snapping
    • multi-touch, simultaneous interactions
    • cross browser and device, supporting the desktop and mobile versions of Chrome, Firefox and Opera as well as Internet Explorer 9+
    • interaction with SVG elements
    • being standalone and customizable
    • not modifying the DOM except to change the cursor (but you can disable that)

    Installation

    • npm: npm install interactjs
    • jsDelivr CDN: <script src="https://cdn.jsdelivr.net/npm/interactjs/dist/interact.min.js"></script>
    • unpkg CDN: <script src="https://unpkg.com/interactjs/dist/interact.min.js"></script>
    • Rails 5.1+:
      1. yarn install interactjs
      2. //= require interactjs/interact
    • Webjars SBT/Play 2: libraryDependencies ++= Seq("org.webjars.npm" % "interactjs" % version)

    Typescript definitions

    The project is written in Typescript and the npm package includes the type definitions, but if you need the typings alone, you can install them with:

    npm install --save-dev @interactjs/types
    

    Documentation

    http://interactjs.io/docs

    Example

    var pixelSize = 16;
    
    interact('.rainbow-pixel-canvas')
      .origin('self')
      .draggable({
        modifiers: [
          interact.modifiers.snap({
            // snap to the corners of a grid
            targets: [
              interact.snappers.grid({ x: pixelSize, y: pixelSize }),
            ],
          })
        ],
      })
      // draw colored squares on move
      .on('dragmove', function (event) {
        var context = event.target.getContext('2d'),
            // calculate the angle of the drag direction
            dragAngle = 180 * Math.atan2(event.dx, event.dy) / Math.PI;
    
        // set color based on drag angle and speed
        context.fillStyle = 'hsl(' + dragAngle + ', 86%, '
                            + (30 + Math.min(event.speed / 1000, 1) * 50) + '%)';
    
        // draw squares
        context.fillRect(event.pageX - pixelSize / 2, event.pageY - pixelSize / 2,
                         pixelSize, pixelSize);
      })
      // clear the canvas on doubletap
      .on('doubletap', function (event) {
        var context = event.target.getContext('2d');
    
        context.clearRect(0, 0, context.canvas.width, context.canvas.height);
      });
    
      function resizeCanvases () {
        [].forEach.call(document.querySelectorAll('.rainbow-pixel-canvas'), function (canvas) {
          canvas.width = document.body.clientWidth;
          canvas.height = window.innerHeight * 0.7;
        });
      }
    
      // interact.js can also add DOM event listeners
      interact(document).on('DOMContentLoaded', resizeCanvases);
      interact(window).on('resize', resizeCanvases);
    

    See the above code in action at https://codepen.io/taye/pen/tCKAm

    License

    interact.js is released under the MIT License.

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