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React can be used in any web application. It can be embedded in other applications and, with a little care, other applications can be embedded in React. This guide will examine some of the more common use cases, focusing on integration with jQuery and Backbone, but the same ideas can be applied to integrating components with any existing code.

React is unaware of changes made to the DOM outside of React. It determines updates based on its own internal representation, and if the same DOM nodes are manipulated by another library, React gets confused and has no way to recover.

This does not mean it is impossible or even necessarily difficult to combine React with other ways of affecting the DOM, you just have to be mindful of what each is doing.

The easiest way to avoid conflicts is to prevent the React component from updating. You can do this by rendering elements that React has no reason to update, like an empty

.

To demonstrate this, let’s sketch out a wrapper for a generic jQuery plugin.

We will attach a ref to the root DOM element. Inside componentDidMount, we will get a reference to it so we can pass it to the jQuery plugin.

To prevent React from touching the DOM after mounting, we will return an empty

from the render() method. The
element has no properties or children, so React has no reason to update it, leaving the jQuery plugin free to manage that part of the DOM:

Note that we defined both componentDidMount and componentWillUnmount lifecycle methods. Many jQuery plugins attach event listeners to the DOM so it’s important to detach them in componentWillUnmount. If the plugin does not provide a method for cleanup, you will probably have to provide your own, remembering to remove any event listeners the plugin registered to prevent memory leaks.

For a more concrete example of these concepts, let’s write a minimal wrapper for the plugin Chosen, which augments DOM node, it reads the attributes off of the original DOM node, hides it with an inline style, and then appends a separate DOM node with its own visual representation right after the wrapped in a

:

Notice how we wrapped node we passed to it. However, as far as React is concerned,

always only has a single child. This is how we ensure that React updates won’t conflict with the extra DOM node appended by Chosen. It is important that if you modify the DOM outside of React flow, you must ensure React doesn’t have a reason to touch those DOM nodes.

Next, we will implement the lifecycle methods. We need to initialize Chosen with the ref to the managed by Chosen.

We won’t pass this.props.onChange directly to Chosen because component’s props might change over time, and that includes event handlers. Instead, we will declare a handleChange() method that calls this.props.onChange, and subscribe it to the jQuery change event:

Try it on CodePen

Finally, there is one more thing left to do. In React, props can change over time. For example, the component can get different children if parent component’s state changes. This means that at integration points it is important that we manually update the DOM in response to prop updates, since we no longer let React manage the DOM for us.

Chosen’s documentation suggests that we can use jQuery trigger() API to notify it about changes to the original DOM element. We will let React take care of updating this.props.children inside children managed by React change.

The complete implementation of the Chosen component looks like this:

Try it on CodePen

React can be embedded into other applications thanks to the flexibility of createRoot().

Although React is commonly used at startup to load a single root React component into the DOM, createRoot() can also be called multiple times for independent parts of the UI which can be as small as a button, or as large as an app.

In fact, this is exactly how React is used at Facebook. This lets us write applications in React piece by piece, and combine them with our existing server-generated templates and other client-side code.

A common pattern in older web applications is to describe chunks of the DOM as a string and insert it into the DOM like so: $el.html(htmlString). These points in a codebase are perfect for introducing React. Just rewrite the string based rendering as a React component.

So the following jQuery implementation…

…could be rewritten using a React component:

From here you could start moving more logic into the component and begin adopting more common React practices. For example, in components it is best not to rely on IDs because the same component can be rendered multiple times. Instead, we will use the React event system and register the click handler directly on the React


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