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If you want the default behavior, there is no need to pass a second argument to this function. If you want previously attached files to not be deleted each time a user attaches new files, then you can opt in by calling setFiles like this, setFiles(e, 'a'), where the a stands for append.
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The default mode is set to, w, which means it will write over previous files each time new ones are attached. (file: number | string) => voidĪ function that accepts the event emitted from the input field or drop zone, and creates an array of File objects. (e) => voidĪ function that accepts a number( index) or string( name of the file) that will be used to remove a specific file from the files array. React Hooks Multiple File Upload example with Progress Bar & Axios Were gonna create a React Multiple Files upload application using Hooks, in that u. () => FormDataĪ function that prevents you from writing boilerplate code, and will call e.preventDefault and e.stopPropagation behind the scenes. () => voidĪ function that will prepare the files to be sent to an external API by creating a new FormData object, appending the files to it, and then returning the FormData object. numberĪ function that will remove all files in the files array. stringĪ number that represents the size of all of the files in bytes. stringĪ string that will pretty print the total size of the files. stringĪn array containing just the file types of the files. FileĪn array containing just the names of the files. if you need access to multiple properties of a File at a time, use this array instead of fileNames and fileTypes, which are mainly included in this hook for convenience. Here is a photo of the example app above:Īn array of File objects.