electron/docs/api/browser/browser-window.md

browser-window

The BrowserWindow class gives you ability to create a browser window, an example is:

var BrowserWindow = require('browser-window');

var win = new BrowserWindow({ width: 800, height: 600, show: false });
win.on('destroyed', function() {
  win = null;
});

win.loadUrl('https://github.com');
win.show();

You can also create a window without chrome by using Frameless Window API.

Note: Be careful not to use window as the variable name.

Class: BrowserWindow

BrowserWindow is an EventEmitter.

new BrowserWindow(options)

• options Object
  • x Integer - Window's left offset to screen
  • y Integer - Window's top offset to screen
  • center Boolean - Show window in the center of the screen
  • min-width Integer - Minimum width
  • min-height Integer - Minimum height
  • max-width Integer - Maximum width
  • max-height Integer - Maximum height
  • resizable Boolean - Whether window is resizable
  • always-on-top Boolean - Whether the window should always stay on top of other windows
  • fullscreen Boolean - Whether the window should show in fullscreen
  • kiosk Boolean - The kiosk mode
  • title String - Default window title
  • show Boolean - Whether window should be shown when created
  • frame Boolean - Specify false to create a Frameless Window

Creates a new BrowserWindow with native properties set by the options. Usually you only need to set the width and height, other properties will have decent default values.

Event: 'page-title-updated'

• event Event

Emitted when the document changed its title, calling event.preventDefault() would prevent the native window's title to change.

Event: 'loading-state-changed'

• event Event
• isLoading Boolean

Emitted when the window is starting or is done loading a page.

Event: 'close'

• event Event

Emitted when the window is going to be closed. It's emitted before the beforeunload and unload event of DOM, calling event.preventDefault() would cancel the close.

Usually you would want to use the beforeunload handler to decide whether the window should be closed, which will also be called when the window is reloaded. In atom-shell, returning an empty string or false would cancel the close. An example is:

window.onbeforeunload = function(e) {
  console.log('I do not want to be closed');

  // Unlike usual browsers, in which a string should be returned and the user is
  // prompted to confirm the page unload. atom-shell gives the power completely
  // to the developers, return empty string or false would prevent the unloading
  // now. You can also use the dialog API to let user confirm it.
  return false;
};

Event: 'closed'

Emitted when the window is closed. At the time of this event, window is not destroyed yet so you can still do some operations to the window (but you shouldn't!).

Event: 'destroyed'

Emitted when the memory taken by the native window is released. Usually you should dereference the javascript object when received this event.

Event: 'unresponsive'

Emiited when the web page becomes unresponsive.

Event: 'responsive'

Emitted when the unresponsive web page becomes responsive again.

Event: 'crashed'

Emitted when the renderer process is crashed.

Event: 'blur'

Emiited when window loses focus.

Class Method: BrowserWindow.getAllWindows()

Returns an array of all opened browser windows.

Class Method: BrowserWindow.getFocusedWindow()

Returns the window that is focused in this application.

Class Method: BrowserWindow.fromProcessIdAndRoutingId(processId, routingId)

• processId Integer
• routingId Integer

Find a window according to its processId and routingId.

BrowserWindow.destroy()

Destroy the window and free the memory without closing it.

Note: Usually you should always call Window.close() to close the window, **which will emit beforeunload and unload events for DOM. Only use **Window.destroy() when the window gets into a very bad state and you want **to force closing it.

BrowserWindow.close()

Try to close the window, this has the same effect with user manually clicking the close button of the window. The web page may cancel the close though, see the close event.

BrowserWindow.focus()

Focus on the window.

BrowserWindow.isFocused()

Returns whether the window is focused.

BrowserWindow.show()

Shows the window.

BrowserWindow.hide()

Hides the window.

BrowserWindow.isVisible()

Returns whether the window is visible to the user.

BrowserWindow.maximize()

Maximizes the window.

BrowserWindow.unmaximize()

Unmaximizes the window.

BrowserWindow.minimize()

Minimizes the window. On some platforms the minimized window will be shown in the Dock.

BrowserWindow.restore()

Restores the window from minimized state to its previous state.

BrowserWindow.setFullScreen(flag)

• flag Boolean

Sets whether the window should be in fullscreen mode.

BrowserWindow.isFullScreen()

Returns whether the window is in fullscreen mode.

BrowserWindow.setSize(width, height)

• width Integer
• height Integer

Resizes the window to width and height.

BrowserWindow.getSize()

Returns an array that contains window's width and height.

BrowserWindow.setMinimumSize(width, height)

• width Integer
• height Integer

Sets the minimum size of window to width and height.

BrowserWindow.getMinimumSize()

Returns an array that contains window's minimum width and height.

BrowserWindow.setMaximumSize(width, height)

• width Integer
• height Integer

Sets the maximum size of window to width and height.

BrowserWindow.getMaximumSize()

Returns an array that contains window's maximum width and height.

BrowserWindow.setResizable(resizable)

• resizable Boolean

Sets whether the window can be manually resized by user.

BrowserWindow.isResizable()

Returns whether the window can be manually resized by user.

BrowserWindow.setAlwaysOnTop(flag)

• flag Boolean

Sets whether the window should show always on top of other windows. After setting this, the window is still a normal window, not a toolbox window which can not be focused on.

BrowserWindow.isAlwaysOnTop()

Returns whether the window is always on top of other windows.

BrowserWindow.center()

Moves window to the center of the screen.

BrowserWindow.setPosition(x, y)

• x Integer
• y Integer

Moves window to x and y.

BrowserWindow.getPosition()

Returns an array that contains window's current position.

BrowserWindow.setTitle(title)

• title String

Changes the title of native window to title.

BrowserWindow.getTitle()

Returns the title of the native window.

Note: The title of web page can be different from the title of the native **window.

BrowserWindow.flashFlame()

Flashes the window to attract user's attention.

BrowserWindow.setKiosk(flag)

• flag Boolean

Enters or leaves the kiosk mode.

BrowserWindow.isKiosk()

Returns whether the window is in kiosk mode.

BrowserWindow.openDevTools()

Opens the developer tools.

BrowserWindow.closeDevTools()

Closes the developer tools.

BrowserWindow.inspectElement(x, y)

• x Integer
• y Integer

Starts inspecting element at position (x, y).

BrowserWindow.focusOnWebView()

BrowserWindow.blurWebView()

BrowserWindow.capturePage([rect, ]callback)

• rect Object - The area of page to be captured
  • x
  • y
  • width
  • height
• callback Function

Captures the snapshot of page within rect, upon completion callback would be called with callback(image), the image is a Buffer that stores the PNG encoded data of the snapshot. Omitting the rect would capture the whole visible page.

You can write received image directly to a .png file, or you can base64 encode it and use data URL to embed the image in HTML.

Note: Be sure to read documents on remote buffer in remote if you are going to use this API in renderer process.

BrowserWindow.getPageTitle()

Returns the title of web page.

BrowserWindow.isLoading()

Returns whether web page is still loading resources.

BrowserWindow.isWaitingForResponse()

Returns whether web page is waiting for a first-response for the main resource of the page.

BrowserWindow.stop()

Stops any pending navigation.

BrowserWindow.getProcessId()

Returns window's process ID. The process ID and routing ID can be used together to locate a window.

BrowserWindow.getRoutingId()

Returns window's routing ID. The process ID and routing ID can be used together to locate a window.

BrowserWindow.loadUrl(url)

• url URL

Loads the url in the window, the url must contains the protocol prefix, e.g. the http:// or file://.

BrowserWindow.getUrl()

Returns URL of current web page.

BrowserWindow.canGoBack()

Returns whether the web page can go back.

BrowserWindow.canGoForward()

Returns whether the web page can go forward.

BrowserWindow.canGoToOffset(offset)

• offset Integer

Returns whether the web page can go to offset.

BrowserWindow.goBack()

Makes the web page go back.

BrowserWindow.goForward()

Makes the web page go forward.

BrowserWindow.goToIndex(index)

• index Integer

Navigates to the specified absolute index.

BrowserWindow.goToOffset(offset)

• offset Integer

Navigates to the specified offset from the "current entry".

BrowserWindow.reload()

Reloads current window.

BrowserWindow.reloadIgnoringCache()

Reloads current window and ignores cache.