Electron Documentation1.6.8

Docs / API / webFrame

webFrame

Customize the rendering of the current web page.

Process: Renderer

An example of zooming current page to 200%.

const {webFrame} = require('electron')

webFrame.setZoomFactor(2)

Methods

The webFrame module has the following methods:

webFrame.setZoomFactor(factor)

Changes the zoom factor to the specified factor. Zoom factor is zoom percent divided by 100, so 300% = 3.0.

webFrame.getZoomFactor()

Returns Number - The current zoom factor.

webFrame.setZoomLevel(level)

Changes the zoom level to the specified level. The original size is 0 and each increment above or below represents zooming 20% larger or smaller to default limits of 300% and 50% of original size, respectively.

webFrame.getZoomLevel()

Returns Number - The current zoom level.

webFrame.setZoomLevelLimits(minimumLevel, maximumLevel)

Deprecated: Call setVisualZoomLevelLimits instead to set the visual zoom level limits. This method will be removed in Electron 2.0.

webFrame.setVisualZoomLevelLimits(minimumLevel, maximumLevel)

Sets the maximum and minimum pinch-to-zoom level.

webFrame.setLayoutZoomLevelLimits(minimumLevel, maximumLevel)

Sets the maximum and minimum layout-based (i.e. non-visual) zoom level.

webFrame.setSpellCheckProvider(language, autoCorrectWord, provider)

Sets a provider for spell checking in input fields and text areas.

The provider must be an object that has a spellCheck method that returns whether the word passed is correctly spelled.

An example of using node-spellchecker as provider:

const {webFrame} = require('electron')
webFrame.setSpellCheckProvider('en-US', true, {
  spellCheck (text) {
    return !(require('spellchecker').isMisspelled(text))
  }
})

webFrame.registerURLSchemeAsSecure(scheme)

Registers the scheme as secure scheme.

Secure schemes do not trigger mixed content warnings. For example, https and data are secure schemes because they cannot be corrupted by active network attackers.

webFrame.registerURLSchemeAsBypassingCSP(scheme)

Resources will be loaded from this scheme regardless of the current page’s Content Security Policy.

webFrame.registerURLSchemeAsPrivileged(scheme[, options])

Registers the scheme as secure, bypasses content security policy for resources, allows registering ServiceWorker and supports fetch API.

Specify an option with the value of false to omit it from the registration. An example of registering a privileged scheme, without bypassing Content Security Policy:

const {webFrame} = require('electron')
webFrame.registerURLSchemeAsPrivileged('foo', { bypassCSP: false })

webFrame.insertText(text)

Inserts text to the focused element.

webFrame.executeJavaScript(code[, userGesture, callback])

Returns Promise - A promise that resolves with the result of the executed code or is rejected if the result of the code is a rejected promise.

Evaluates code in page.

In the browser window some HTML APIs like requestFullScreen can only be invoked by a gesture from the user. Setting userGesture to true will remove this limitation.

webFrame.getResourceUsage()

Returns Object:

Returns an object describing usage information of Blink’s internal memory caches.

const {webFrame} = require('electron')
console.log(webFrame.getResourceUsage())

This will generate:

{
  images: {
    count: 22,
    size: 2549,
    liveSize: 2542
  },
  cssStyleSheets: { /* same with "images" */ },
  xslStyleSheets: { /* same with "images" */ },
  fonts: { /* same with "images" */ },
  other: { /* same with "images" */ }
}

webFrame.clearCache()

Attempts to free memory that is no longer being used (like images from a previous navigation).

Note that blindly calling this method probably makes Electron slower since it will have to refill these emptied caches, you should only call it if an event in your app has occurred that makes you think your page is actually using less memory (i.e. you have navigated from a super heavy page to a mostly empty one, and intend to stay there).


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