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12 sie 2019 · The main idea of the solution is: the JavaScript code cannot access the file by having its local URL. But it can use the file by having its DataURL: so if the user browses a file and opens it, JavaScript should get the "DataURL" directly from HTML instead of getting "URL".
The FileReader API allows web applications to read the contents of files (or raw data buffers) stored on the user's computer, using File or Blob objects to specify the file or data to read.
The File object allows you to access the selected file in JavaScript. And JavaScript uses the FileList object to hold the File objects. To read the content of a file, you use the FileReader object. Note that the FileReader only can access the files you selected via drag & drop or file input. To use the FileReader object, you follow these steps:
23 lip 2010 · The File interface provides information about files and allows JavaScript in a web page to access their content. File objects are generally retrieved from a FileList object returned as a result of a user selecting files using the <input> element, or from a drag and drop operation's DataTransfer object.
File and FileReader. A File object inherits from Blob and is extended with filesystem-related capabilities. There are two ways to obtain it. First, there’s a constructor, similar to Blob: new File(fileParts, fileName, [options]) fileParts – is an array of Blob/BufferSource/String values. fileName – file name string.
18 cze 2010 · There are two primary ways of selecting files: using the HTML input element, and using a drag-and-drop zone. HTML input element. The easiest way for users to select files is using the <input type="file"> element, which is supported in every major browser.
24 wrz 2024 · The <input type="file"> element on a page allows the user to click it and open one or multiple files. The trick now consists of inserting the element invisibly into a page with JavaScript and clicking it programmatically.
