FileReader
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object FileReader
| package html
Aborts the read operation.
Aborts the read operation. Upon return, the readyState will be DONE.
A DOMError representing the error that occurred while reading the file.
A handler for the abort event.
A handler for the abort event. This event is triggered each time the reading operation is aborted.
A handler for the error event.
A handler for the error event. This event is triggered each time the reading operation encounter an error.
A handler for the load event.
A handler for the load event. This event is triggered each time the reading operation is successfully completed.
A handler for the loadend event.
A handler for the loadend event. This event is triggered each time the reading operation is completed (either in success or failure).
A handler for the loadstart event.
A handler for the loadstart event. This event is triggered each time the reading is starting.
A handler for the progress event.
A handler for the progress event. This event is triggered while reading a Blob content.
The FileReader interface's readAsArrayBuffer() method is used to start reading the contents of a specified Blob or File.
The FileReader interface's readAsArrayBuffer() method is used to start reading the contents of a specified Blob or File. When the read operation is finished, the readyState becomes DONE, and the loadend is triggered. At that time, the result attribute contains an ArrayBuffer representing the file's data.
The readAsBinaryString method is used to start reading the contents of the specified Blob or File.
The readAsBinaryString method is used to start reading the contents of the specified Blob or File. When the read operation is finished, the readyState becomes DONE, and the loadend is triggered. At that time, the result attribute contains the raw binary data from the file.
The readAsDataURL method is used to read the contents of the specified Blob or File.
The readAsDataURL method is used to read the contents of the specified Blob or File. When the read operation is finished, the readyState becomes DONE, and the loadend is triggered. At that time, the result attribute contains the data as a URL representing the file's data as a base64 encoded string.
The readAsText method is used to read the contents of the specified Blob or File.
The readAsText method is used to read the contents of the specified Blob or File. When the read operation is complete, the readyState is changed to DONE, the loadend is triggered, and the result attribute contains the contents of the file as a text string.
A number indicating the state of the FileReader.
A number indicating the state of the FileReader.
The file's contents.
The file's contents. This property is only valid after the read operation is complete, and the format of the data depends on which of the methods was used to initiate the read operation.
The FileReader object lets web applications asynchronously 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.
File objects may be obtained from a FileList object returned as a result of a user selecting files using the element, from a drag and drop operation's DataTransfer object, or from the mozGetAsFile() API on an HTMLCanvasElement.
https://developer.mozilla.org/en-US/docs/Web/API/FileReader