147 lines
6 KiB
Markdown
147 lines
6 KiB
Markdown
# dialog
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> Display native system dialogs for opening and saving files, alerting, etc.
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Process: [Main](../tutorial/quick-start.md#main-process)
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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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const {dialog} = require('electron')
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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
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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
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console.log(dialog)
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```
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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 (optional)
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* `defaultPath` String (optional)
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* `buttonLabel` String (optional) - Custom label for the confirmation button, when
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left empty the default label will be used.
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* `filters` [FileFilter[]](structures/file-filter.md) (optional)
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* `properties` String[] - (optional) - Contains which features the dialog should use, can
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contain `openFile`, `openDirectory`, `multiSelections`, `createDirectory`
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and `showHiddenFiles`.
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* `callback` Function (optional)
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* `filePaths` String[] - An array of file paths chosen by the user
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Returns `String[]`, an array of file paths chosen by the user,
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if the callback is provided 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 (optional)
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* `defaultPath` String (optional)
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* `buttonLabel` String (optional) - Custom label for the confirmation button, when
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left empty the default label will be used.
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* `filters` [FileFilter[]](structrs/file-filter.md) (optional)
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* `callback` Function (optional)
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* `filename` String
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Returns `String`, the path of the file chosen by the user,
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if a callback is provided 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 (optional) - 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` String[] - (optional) - Array of texts for buttons. On Windows, an empty array
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will result in one button labeled "OK".
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* `defaultId` Integer (optional) - 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 (optional) - 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 (optional) - Extra information of the message.
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* `icon` [NativeImage](native-image.md) (optional)
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* `cancelId` Integer (optional) - 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 macOS 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 (optional) - 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 (optional)
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* `response` Number - The index of the button that was clicked
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Returns `Integer`, the index of the clicked button, if a callback is provided
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it returns undefined.
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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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* `title` String - The title to display in the error box
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* `content` String - The text content to display in the error box
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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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## Sheets
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On macOS, dialogs are presented as sheets attached to a window if you provide
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a `BrowserWindow` reference in the `browserWindow` parameter, or modals if no
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window is provided.
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You can call `BrowserWindow.getCurrentWindow().setSheetOffset(offset)` to change
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the offset from the window frame where sheets are attached.
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