Get React Component Data by DOM Node

By  on  

Retrieving a React component's DOM node is fairly simple from within the component itself, but what if you want to work backward:  retrieve a component's instance by DOM node?  This is a task that the old Dojo Toolkit's Dijit framework allowed with the dijit.byId method, so it made me think if you could do the same with React.  It turns out you can retrieve a component instance by DOM node!

The following function allows you to get a React component instance by DOM node:

function findReactElement(node) {
    for (var key in node) {
        if (key.startsWith("__reactInternalInstance$")) {
            return node[key]._debugOwner.stateNode;
        }
    }
    return null;
}

If the node is a React component root, you'll see a load of amazing information, like its props, state, context, refs, list of methods, and more:

React Element State

Modifying props/state and calling render methods don't appear to actually do anything, so manipulation doesn't look possible from the outside, but it is useful to be able to get the component instance based on DOM node if for nothing other than inspection.  Nice!

Recent Features

  • By
    How I Stopped WordPress Comment Spam

    I love almost every part of being a tech blogger:  learning, preaching, bantering, researching.  The one part about blogging that I absolutely loathe:  dealing with SPAM comments.  For the past two years, my blog has registered 8,000+ SPAM comments per day.  PER DAY.  Bloating my database...

  • By
    Convert XML to JSON with JavaScript

    If you follow me on Twitter, you know that I've been working on a super top secret mobile application using Appcelerator Titanium.  The experience has been great:  using JavaScript to create easy to write, easy to test, native mobile apps has been fun.  My...

Incredible Demos

  • By
    Image Reflection with jQuery and MooTools

    One subtle detail that can make a big difference on any web design is the use of image reflections. Using them too often can become obnoxious but using reflections on large, "masthead" images is a classy enhancement. Unfortunately creating image reflections within your...

  • By
    MooTools Clipboard Plugin

    The ability to place content into a user's clipboard can be extremely convenient for the user. Instead of clicking and dragging down what could be a lengthy document, the user can copy the contents of a specific area by a single click of a mouse.

Discussion

  1. Hristo

    This is not a good practice in my opinion. What if React change these properties in the next versions? In general this approach seems counter-OOP, it’s like stirring in the gut…

Wrap your code in <pre class="{language}"></pre> tags, link to a GitHub gist, JSFiddle fiddle, or CodePen pen to embed!