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JavaScript provides the FileReader API to read the contents of files selected by users through an <input> element. This is commonly used for text, images, or binary data.
Example: Reading a Text File
// HTML: <input type="file" id="fileInput">document.getElementById('fileInput').addEventListener('change', function () {const file = this.files[0]; // Get the selected fileconst reader = new FileReader();reader.onload = function () {console.log(reader.result); // Logs the file content};reader.onerror = function () {console.error('Error reading file:', reader.error);};reader.readAsText(file); // Reads the file as plain text});Gekopieerd.āKopiërenExplanation:
this.files[0]: Accesses the first selected file.
FileReader.readAsText(): Reads the file as a text string.
reader.onload: Executes when the file is successfully read.
reader.onerror: Handles errors during reading.
Alternative Methods:
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How can I read a local text file in the browser? - Stack Overflow
Yes, JavaScript can read local files (see FileReader ()), but not automatically: the user has to pass the file or a list of files to the script with an HTML tag, <input type="file">.
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