102 lines
2.8 KiB
Markdown
102 lines
2.8 KiB
Markdown
|
# DownloadItem
|
||
|
|
|
||
|
|
`DownloadItem` is an EventEmitter represents a download item in Electron. It
|
||
|
|
is used in `will-download` event of `Session` module, and allows users to
|
||
|
|
control the download item.
|
||
|
|
|
||
|
|
```javascript
|
||
|
|
// In the main process.
|
||
|
|
win.webContents.session.on('will-download', function(event, item, webContents) {
|
||
|
|
// Set the save path, making Electron not to prompt a save dialog.
|
||
|
|
item.setSavePath('/tmp/save.pdf');
|
||
|
|
console.log(item.getMimeType());
|
||
|
|
console.log(item.getFilename());
|
||
|
|
console.log(item.getTotalBytes());
|
||
|
|
item.on('updated', function() {
|
||
|
|
console.log('Received bytes: ' + item.getReceivedBytes());
|
||
|
|
});
|
||
|
|
item.on('done', function(e, state) {
|
||
|
|
if (state == "completed") {
|
||
|
|
console.log("Download successfully");
|
||
|
|
} else {
|
||
|
|
console.log("Download is cancelled or interrupted that can't be resumed");
|
||
|
|
}
|
||
|
|
});
|
||
|
|
```
|
||
|
|
|
||
|
|
## Events
|
||
|
|
|
||
|
|
### Event: 'updated'
|
||
|
|
|
||
|
|
Emits when the `downloadItem` gets updated.
|
||
|
|
|
||
|
|
### Event: 'done'
|
||
|
|
|
||
|
|
* `event` Event
|
||
|
|
* `state` String
|
||
|
|
* `completed` - The download completed successfully.
|
||
|
|
* `cancelled` - The download has been cancelled.
|
||
|
|
* `interrupted` - An error broke the connection with the file server.
|
||
|
|
|
||
|
|
Emits when the download is in a terminal state. This includes a completed
|
||
|
|
download, a cancelled download(via `downloadItem.cancel()`), and interrupted
|
||
|
|
download that can't be resumed.
|
||
|
|
|
||
|
|
## Methods
|
||
|
|
|
||
|
|
The `downloadItem` object has the following methods:
|
||
|
|
|
||
|
|
### `downloadItem.setSavePath(path)`
|
||
|
|
|
||
|
|
* `path` String - Set the save file path of the download item.
|
||
|
|
|
||
|
|
The API is only available in session's `will-download` callback function.
|
||
|
|
If user doesn't set the save path via the API, Electron will use the original
|
||
|
|
routine to determine the save path(Usually prompts a save dialog).
|
||
|
|
|
||
|
|
### `downloadItem.pause()`
|
||
|
|
|
||
|
|
Pauses the download.
|
||
|
|
|
||
|
|
### `downloadItem.resume()`
|
||
|
|
|
||
|
|
Resumes the download that has been paused.
|
||
|
|
|
||
|
|
### `downloadItem.cancel()`
|
||
|
|
|
||
|
|
Cancels the download operation.
|
||
|
|
|
||
|
|
### `downloadItem.getURL()`
|
||
|
|
|
||
|
|
Returns a `String` represents the origin url where the item is downloaded from.
|
||
|
|
|
||
|
|
### `downloadItem.getMimeType()`
|
||
|
|
|
||
|
|
Returns a `String` represents the mime type.
|
||
|
|
|
||
|
|
### `downloadItem.hasUserGesture()`
|
||
|
|
|
||
|
|
Returns a `Boolean` indicates whether the download has user gesture.
|
||
|
|
|
||
|
|
### `downloadItem.getFilename()`
|
||
|
|
|
||
|
|
Returns a `String` represents the file name of the download item.
|
||
|
|
|
||
|
|
**Note:** The file name is not always the same as the actual one saved in local
|
||
|
|
disk. If user changes the file name in a prompted download saving dialog, the
|
||
|
|
actual name of saved file will be different.
|
||
|
|
|
||
|
|
### `downloadItem.getTotalBytes()`
|
||
|
|
|
||
|
|
Returns a `Integer` represents the total size in bytes of the download item.
|
||
|
|
If the size is unknown, it returns 0.
|
||
|
|
|
||
|
|
### `downloadItem.getReceivedBytes()`
|
||
|
|
|
||
|
|
Returns a `Integer` represents the received bytes of the download item.
|
||
|
|
|
||
|
|
### `downloadItem.getContentDisposition()`
|
||
|
|
|
||
|
|
Returns a `String` represents the Content-Disposition field from the response
|
||
|
|
header.
|