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interactjs

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interactjs

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

  • 1.10.27
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What is interactjs?

Interact.js is a JavaScript library for drag and drop, resizing, and multi-touch gestures for modern browsers. It provides a simple and flexible API to create interactive user interfaces.

What are interactjs's main functionalities?

Drag and Drop

This feature allows elements to be draggable. The code sample demonstrates how to make elements with the class 'draggable' draggable within their parent container.

document.addEventListener('DOMContentLoaded', function () {
  interact('.draggable').draggable({
    inertia: true,
    modifiers: [
      interact.modifiers.restrictRect({
        restriction: 'parent',
        endOnly: true
      })
    ],
    autoScroll: true,
    listeners: {
      move: dragMoveListener
    }
  });

  function dragMoveListener(event) {
    var target = event.target;
    var x = (parseFloat(target.getAttribute('data-x')) || 0) + event.dx;
    var y = (parseFloat(target.getAttribute('data-y')) || 0) + event.dy;
    target.style.transform = 'translate(' + x + 'px, ' + y + 'px)';
    target.setAttribute('data-x', x);
    target.setAttribute('data-y', y);
  }
});

Resizable Elements

This feature allows elements to be resizable. The code sample demonstrates how to make elements with the class 'resizable' resizable within their parent container.

document.addEventListener('DOMContentLoaded', function () {
  interact('.resizable').resizable({
    edges: { left: true, right: true, bottom: true, top: true },
    listeners: {
      move(event) {
        let { x, y } = event.target.dataset;
        x = (parseFloat(x) || 0) + event.deltaRect.left;
        y = (parseFloat(y) || 0) + event.deltaRect.top;
        Object.assign(event.target.style, {
          width: `${event.rect.width}px`,
          height: `${event.rect.height}px`,
          transform: `translate(${x}px, ${y}px)`
        });
        Object.assign(event.target.dataset, { x, y });
      }
    },
    modifiers: [
      interact.modifiers.restrictEdges({
        outer: 'parent',
        endOnly: true
      }),
      interact.modifiers.restrictSize({
        min: { width: 100, height: 50 }
      })
    ],
    inertia: true
  });
});

Gestures

This feature allows elements to respond to multi-touch gestures like pinch and rotate. The code sample demonstrates how to make elements with the class 'gesture-area' respond to these gestures.

document.addEventListener('DOMContentLoaded', function () {
  interact('.gesture-area').gesturable({
    listeners: {
      start(event) {
        console.log(event.type, event.target);
      },
      move(event) {
        var target = event.target;
        var scale = (parseFloat(target.getAttribute('data-scale')) || 1) * (1 + event.ds);
        var angle = (parseFloat(target.getAttribute('data-angle')) || 0) + event.da;
        target.style.transform = 'scale(' + scale + ') rotate(' + angle + 'deg)';
        target.setAttribute('data-scale', scale);
        target.setAttribute('data-angle', angle);
      },
      end(event) {
        console.log(event.type, event.target);
      }
    }
  });
});

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Package last updated on 28 Mar 2024

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