![]() First, it will prevent any default behavior and stop propagation. The drop event is the most important event we need to take care of. This means that we will be able to use this dropzone as a wrapper for other content, without removing the content itself.Įnter fullscreen mode Exit fullscreen mode To make this dropzone more usable, we will set it up so it renders children passed through props. We will use this ref to attach event listeners to the dropzone when the component mounts, and to remove them when it unmounts. The dropzone itself will be a element with ref. ![]() This handler will pass files dropped on the dropzone so they can be processed elsewhere in the app. The sixth event will be invoked when files are dropped on the dropzone. This means when someone is dragging a file over it and when the drag is over.Īny time this happens the handler for this will be invoked, it will pass boolean value specifying current active/non-active state. One will be invoked when the state of the dropzone active changes. The fifth and sixth handler will be synthetic. ![]() These handlers will allow anyone using this dropzone component execute some code when these events fire. Four of these handlers will be invoked on events such as dragenter, dragleave, dragover and drop. The dropzone component will accept six event handlers. This also includes defining some interface for its props, or component API. The first thing we need is to define the file dropzone component. Lastly, we will also memoize every component using memo HOC. Next, we will also use useEffect hook for attaching event listeners and observing dropzone's state. That's basically it.įor state management, we will use the React useState hook. The logic for dropzone will require us to handle few drag and drop events, some simple state management for active state and processing of dropped files. However, this is not necessarily the truth. The idea of custom file dropzone component may look complicated. We will replace it later with the file dropzone and list of files. However, you can leave the content of the App component as it is for now. This includes the logo and the content of App.tsx. Using the create-react-app template will generate some stuff we can remove. This class will apply some CSS styles to highlight the dropzone. This means when someone drags a file over it. We will use this library for appending class to the file dropzone when it is active. This will give us all resources we need, almost.Īlong with the default React and TypeScript dependencies, we will also add classnames library. We will create this app using the create-react-app, with the TypeScript template ( -template typescript flag). In this tutorial we will create a simple file dropzone from scratch without any special dependencies. You will learn how to handle various drag and drop events, how to process dropped files and how to create a simple API for reusable dropzone component. This tutorial will help you create your own simple file dropzone. There are various solutions for file dropzones.
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