<input> - file
HTML DOM FileUpload object
FileUpload object
Each time the <input type="file"> tag appears in an HTML document, a FileUpload object is created.
This element contains a text input field for entering a filename and a button for opening a file selection dialog for graphical selection of files.
The value attribute of this element holds the name of the file specified by the user, but when a form containing a file-upload element is submitted, the browser sends the contents of the selected file to the server instead of just the file name.
For security reasons, the file-upload element does not allow HTML authors or JavaScript programmers to specify a default filename. The HTML value attribute is ignored, and for such elements, the value attribute is read-only, which means that only the user can enter a filename. When the user selects or edits a filename, the file-upload element fires the onchange event handler.
You can access the FileUpload object by iterating over the form's elements[] array, or by using document.getElementById().
FileUpload Object Attributes
W3C: W3C standard.
| Attributes | Description | W3C |
|---|---|---|
| disabled | Sets or returns whether to disable the FileUpload object. | Yes |
| accept | Set or return a comma-separated list of MIME types that indicate file transfers | Yes |
| form | Returns a reference to the form that contains the FileUpload object. | Yes |
| name | Sets or returns the name of the FileUpload object. | Yes |
| type | Returns the type of form element. For FileUpload, it is "file". | Yes |
| value | Returns the file name of the FileUpload object after the text set by the user input. | Yes |
Standard Properties and Events
FileUpload objects also support standard properties and events .