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