127 lines
4.9 KiB
Markdown
127 lines
4.9 KiB
Markdown
# dialog
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The `dialog` module provides APIs to show native system dialogs, such as opening
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files or alerting, so web applications can deliver the same user experience as
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native applications.
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An example of showing a dialog to select multiple files and directories:
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```javascript
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var win = ...; // BrowserWindow in which to show the dialog
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const dialog = require('electron').dialog;
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console.log(dialog.showOpenDialog({ properties: [ 'openFile', 'openDirectory', 'multiSelections' ]}));
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```
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The Dialog is opened from Electron's main thread. If you want to use the dialog object from a renderer process, remember to access it using the remote:
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```javascript
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const dialog = require('electron').remote.dialog;
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```
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**Note for OS X**: If you want to present dialogs as sheets, the only thing you
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have to do is provide a `BrowserWindow` reference in the `browserWindow`
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parameter.
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## Methods
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The `dialog` module has the following methods:
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### `dialog.showOpenDialog([browserWindow, ]options[, callback])`
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* `browserWindow` BrowserWindow (optional)
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* `options` Object
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* `title` String
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* `defaultPath` String
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* `filters` Array
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* `properties` Array - Contains which features the dialog should use, can
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contain `openFile`, `openDirectory`, `multiSelections` and
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`createDirectory`
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* `callback` Function (optional)
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On success this method returns an array of file paths chosen by the user,
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otherwise it returns `undefined`.
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The `filters` specifies an array of file types that can be displayed or
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selected when you want to limit the user to a specific type. For example:
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```javascript
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{
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filters: [
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{ name: 'Images', extensions: ['jpg', 'png', 'gif'] },
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{ name: 'Movies', extensions: ['mkv', 'avi', 'mp4'] },
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{ name: 'Custom File Type', extensions: ['as'] },
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{ name: 'All Files', extensions: ['*'] }
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]
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}
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```
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The `extensions` array should contain extensions without wildcards or dots (e.g.
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`'png'` is good but `'.png'` and `'*.png'` are bad). To show all files, use the
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`'*'` wildcard (no other wildcard is supported).
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If a `callback` is passed, the API call will be asynchronous and the result
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will be passed via `callback(filenames)`
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**Note:** On Windows and Linux an open dialog can not be both a file selector
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and a directory selector, so if you set `properties` to
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`['openFile', 'openDirectory']` on these platforms, a directory selector will be
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shown.
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### `dialog.showSaveDialog([browserWindow, ]options[, callback])`
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* `browserWindow` BrowserWindow (optional)
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* `options` Object
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* `title` String
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* `defaultPath` String
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* `filters` Array
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* `callback` Function (optional)
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On success this method returns the path of the file chosen by the user,
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otherwise it returns `undefined`.
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The `filters` specifies an array of file types that can be displayed, see
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`dialog.showOpenDialog` for an example.
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If a `callback` is passed, the API call will be asynchronous and the result
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will be passed via `callback(filename)`
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### `dialog.showMessageBox([browserWindow, ]options[, callback])`
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* `browserWindow` BrowserWindow (optional)
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* `options` Object
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* `type` String - Can be `"none"`, `"info"`, `"error"`, `"question"` or
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`"warning"`. On Windows, "question" displays the same icon as "info", unless
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you set an icon using the "icon" option.
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* `buttons` Array - Array of texts for buttons.
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* `defaultId` Integer - Index of the button in the buttons array which will
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be selected by default when the message box opens.
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* `title` String - Title of the message box, some platforms will not show it.
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* `message` String - Content of the message box.
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* `detail` String - Extra information of the message.
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* `icon` [NativeImage](native-image.md)
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* `cancelId` Integer - The value will be returned when user cancels the dialog
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instead of clicking the buttons of the dialog. By default it is the index
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of the buttons that have "cancel" or "no" as label, or 0 if there is no such
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buttons. On OS X and Windows the index of "Cancel" button will always be
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used as `cancelId`, not matter whether it is already specified.
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* `noLink` Boolean - On Windows Electron will try to figure out which one of
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the `buttons` are common buttons (like "Cancel" or "Yes"), and show the
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others as command links in the dialog. This can make the dialog appear in
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the style of modern Windows apps. If you don't like this behavior, you can
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set `noLink` to `true`.
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* `callback` Function
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Shows a message box, it will block the process until the message box is closed.
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It returns the index of the clicked button.
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If a `callback` is passed, the API call will be asynchronous and the result
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will be passed via `callback(response)`.
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### `dialog.showErrorBox(title, content)`
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Displays a modal dialog that shows an error message.
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This API can be called safely before the `ready` event the `app` module emits,
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it is usually used to report errors in early stage of startup. If called
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before the app `ready`event on Linux, the message will be emitted to stderr,
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and no GUI dialog will appear.
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