193 lines
5.3 KiB
Markdown
193 lines
5.3 KiB
Markdown
# webFrame
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> Customize the rendering of the current web page.
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Process: [Renderer](../tutorial/quick-start.md#renderer-process)
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An example of zooming current page to 200%.
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```javascript
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const {webFrame} = require('electron')
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webFrame.setZoomFactor(2)
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```
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## Methods
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The `webFrame` module has the following methods:
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### `webFrame.setZoomFactor(factor)`
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* `factor` Number - Zoom factor.
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Changes the zoom factor to the specified factor. Zoom factor is
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zoom percent divided by 100, so 300% = 3.0.
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### `webFrame.getZoomFactor()`
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Returns `Number` - The current zoom factor.
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### `webFrame.setZoomLevel(level)`
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* `level` Number - Zoom level
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Changes the zoom level to the specified level. The original size is 0 and each
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increment above or below represents zooming 20% larger or smaller to default
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limits of 300% and 50% of original size, respectively.
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### `webFrame.getZoomLevel()`
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Returns `Number` - The current zoom level.
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### `webFrame.setZoomLevelLimits(minimumLevel, maximumLevel)`
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* `minimumLevel` Number
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* `maximumLevel` Number
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**Deprecated:** Call `setVisualZoomLevelLimits` instead to set the visual zoom
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level limits. This method will be removed in Electron 2.0.
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### `webFrame.setVisualZoomLevelLimits(minimumLevel, maximumLevel)`
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* `minimumLevel` Number
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* `maximumLevel` Number
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Sets the maximum and minimum pinch-to-zoom level.
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### `webFrame.setLayoutZoomLevelLimits(minimumLevel, maximumLevel)`
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* `minimumLevel` Number
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* `maximumLevel` Number
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Sets the maximum and minimum layout-based (i.e. non-visual) zoom level.
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### `webFrame.setSpellCheckProvider(language, autoCorrectWord, provider)`
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* `language` String
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* `autoCorrectWord` Boolean
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* `provider` Object
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* `spellCheck` Function - Returns `Boolean`
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* `text` String
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Sets a provider for spell checking in input fields and text areas.
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The `provider` must be an object that has a `spellCheck` method that returns
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whether the word passed is correctly spelled.
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An example of using [node-spellchecker][spellchecker] as provider:
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```javascript
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const {webFrame} = require('electron')
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webFrame.setSpellCheckProvider('en-US', true, {
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spellCheck (text) {
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return !(require('spellchecker').isMisspelled(text))
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}
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})
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```
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### `webFrame.registerURLSchemeAsSecure(scheme)`
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* `scheme` String
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Registers the `scheme` as secure scheme.
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Secure schemes do not trigger mixed content warnings. For example, `https` and
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`data` are secure schemes because they cannot be corrupted by active network
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attackers.
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### `webFrame.registerURLSchemeAsBypassingCSP(scheme)`
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* `scheme` String
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Resources will be loaded from this `scheme` regardless of the current page's
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Content Security Policy.
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### `webFrame.registerURLSchemeAsPrivileged(scheme[, options])`
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* `scheme` String
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* `options` Object (optional)
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* `secure` Boolean - (optional) Default true.
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* `bypassCSP` Boolean - (optional) Default true.
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* `allowServiceWorkers` Boolean - (optional) Default true.
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* `supportFetchAPI` Boolean - (optional) Default true.
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* `corsEnabled` Boolean - (optional) Default true.
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Registers the `scheme` as secure, bypasses content security policy for resources,
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allows registering ServiceWorker and supports fetch API.
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Specify an option with the value of `false` to omit it from the registration.
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An example of registering a privileged scheme, without bypassing Content Security Policy:
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```javascript
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const {webFrame} = require('electron')
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webFrame.registerURLSchemeAsPrivileged('foo', { bypassCSP: false })
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```
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### `webFrame.insertText(text)`
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* `text` String
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Inserts `text` to the focused element.
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### `webFrame.executeJavaScript(code[, userGesture, callback])`
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* `code` String
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* `userGesture` Boolean (optional) - Default is `false`.
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* `callback` Function (optional) - Called after script has been executed.
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* `result` Any
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Evaluates `code` in page.
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In the browser window some HTML APIs like `requestFullScreen` can only be
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invoked by a gesture from the user. Setting `userGesture` to `true` will remove
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this limitation.
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### `webFrame.getResourceUsage()`
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Returns `Object`:
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* `images` [MemoryUsageDetails](structures/memory-usage-details.md)
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* `cssStyleSheets` [MemoryUsageDetails](structures/memory-usage-details.md)
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* `xslStyleSheets` [MemoryUsageDetails](structures/memory-usage-details.md)
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* `fonts` [MemoryUsageDetails](structures/memory-usage-details.md)
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* `other` [MemoryUsageDetails](structures/memory-usage-details.md)
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Returns an object describing usage information of Blink's internal memory
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caches.
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```javascript
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const {webFrame} = require('electron')
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console.log(webFrame.getResourceUsage())
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```
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This will generate:
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```javascript
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{
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images: {
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count: 22,
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size: 2549,
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liveSize: 2542,
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decodedSize: 478,
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purgedSize: 0,
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purgeableSize: 0
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},
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cssStyleSheets: { /* same with "images" */ },
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xslStyleSheets: { /* same with "images" */ },
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fonts: { /* same with "images" */ },
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other: { /* same with "images" */ }
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}
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```
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### `webFrame.clearCache()`
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Attempts to free memory that is no longer being used (like images from a
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previous navigation).
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Note that blindly calling this method probably makes Electron slower since it
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will have to refill these emptied caches, you should only call it if an event
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in your app has occurred that makes you think your page is actually using less
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memory (i.e. you have navigated from a super heavy page to a mostly empty one,
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and intend to stay there).
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[spellchecker]: https://github.com/atom/node-spellchecker
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