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webFrame

Настройка отображения текущей веб-страницы.

Процесс: Графический

webFrame export of the Electron module is an instance of the WebFrame class representing the current frame. Sub-frames can be retrieved by certain properties and methods (e.g. webFrame.firstChild).

Пример масштабирования текущей страницы до 200%.

const { webFrame } = require('electron')

webFrame.setZoomFactor(2)

Методы​

The WebFrame class has the following instance methods:

webFrame.setZoomFactor(factor)​

  • factor Double - Zoom factor; default is 1.0.

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

The factor must be greater than 0.0.

webFrame.getZoomFactor()​

Возвращает number - текущего маштаба.

webFrame.setZoomLevel(level)​

  • level number - уровень увеличения.

Изменяет уровень масштаба на указанный уровень. Оригинальный размер 0 и каждое приращение выше или ниже представляет масштабирование 20% больше или меньше, по умолчанию ограничение на 300% и 50% от исходного размера, соответственно.

NOTE: The zoom policy at the Chromium level is same-origin, meaning that the zoom level for a specific domain propagates across all instances of windows with the same domain. Differentiating the window URLs will make zoom work per-window.

webFrame.getZoomLevel()​

Возвращает number - текущего уровня маштаба.

webFrame.setVisualZoomLevelLimits(minimumLevel, maximumLevel)​

  • minimumLevel number
  • maximumLevel number

Устанавливает максимальный и минимальный уровень пинч-маштабирования.

NOTE: Visual zoom is disabled by default in Electron. To re-enable it, call:

webFrame.setVisualZoomLevelLimits(1, 3)

NOTE: Visual zoom only applies to pinch-to-zoom behavior. Cmd+/-/0 zoom shortcuts are controlled by the 'zoomIn', 'zoomOut', and 'resetZoom' MenuItem roles in the application Menu. To disable shortcuts, manually define the Menu and omit zoom roles from the definition.

webFrame.setSpellCheckProvider(language, provider)​

  • language string
  • Объект provider
    • spellCheck Function
      • строка words[]
      • callback Function
        • строка misspeltWords[]

Задает поставщика для проверки орфографии в полях ввода и текстовых областях.

If you want to use this method you must disable the builtin spellchecker when you construct the window.

const mainWindow = new BrowserWindow({
  webPreferences: {
    spellcheck: false
  }
})

The provider must be an object that has a spellCheck method that accepts an array of individual words for spellchecking. The spellCheck function runs asynchronously and calls the callback function with an array of misspelt words when complete.

Пример использования node-spellchecker как поставщик:

const { webFrame } = require('electron')
const spellChecker = require('spellchecker')
webFrame.setSpellCheckProvider('en-US', {
  spellCheck (words, callback) {
    setTimeout(() => {
      const misspelled = words.filter(x => spellchecker.isMisspelled(x))
      callback(misspelled)
    }, 0)
  }
})

webFrame.insertCSS(css[, options])​

  • css string
  • options Object (опционально)
    • cssOrigin string (optional) - Can be 'user' or 'author'. Sets the cascade origin of the inserted stylesheet. Default is 'author'.

Returns string - A key for the inserted CSS that can later be used to remove the CSS via webFrame.removeInsertedCSS(key).

Injects CSS into the current web page and returns a unique key for the inserted stylesheet.

webFrame.removeInsertedCSS(key)​

  • key string

Removes the inserted CSS from the current web page. The stylesheet is identified by its key, which is returned from webFrame.insertCSS(css).

webFrame.insertText(text)​

  • text string

Вставляет text в элемент с фокусом.

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

  • строка code
  • userGesture boolean (опиционально) - по умолчанию false.
  • callback Function (optional) - Called after script has been executed. Unless the frame is suspended (e.g. showing a modal alert), execution will be synchronous and the callback will be invoked before the method returns. For compatibility with an older version of this method, the error parameter is second.
    • result Any
    • error Error

Returns Promise<any> - A promise that resolves with the result of the executed code or is rejected if execution throws or results in a rejected promise.

Вычисляет code на странице.

В окне браузера некоторые HTML API как requestFullScreen может быть только вызван жестом пользователя. Указание userGesture как true снимает это ограничение.

webFrame.executeJavaScriptInIsolatedWorld(worldId, scripts[, userGesture, callback])​

  • worldId Integer - The ID of the world to run the javascript in, 0 is the default main world (where content runs), 999 is the world used by Electron's contextIsolation feature. Accepts values in the range 1..536870911.
  • scripts WebSource[]
  • userGesture boolean (опиционально) - по умолчанию false.
  • callback Function (optional) - Called after script has been executed. Unless the frame is suspended (e.g. showing a modal alert), execution will be synchronous and the callback will be invoked before the method returns. For compatibility with an older version of this method, the error parameter is second.
    • result Any
    • error Error

Returns Promise<any> - A promise that resolves with the result of the executed code or is rejected if execution could not start.

Works like executeJavaScript but evaluates scripts in an isolated context.

Note that when the execution of script fails, the returned promise will not reject and the result would be undefined. This is because Chromium does not dispatch errors of isolated worlds to foreign worlds.

webFrame.setIsolatedWorldInfo(worldId, info)​

  • worldId Integer - The ID of the world to run the javascript in, 0 is the default world, 999 is the world used by Electrons contextIsolation feature. Chrome extensions reserve the range of IDs in [1 << 20, 1 << 29). You can provide any integer here.
  • Объект info
    • securityOrigin string (optional) - Security origin for the isolated world.
    • csp string (optional) - Content Security Policy for the isolated world.
    • name string (optional) - Name for isolated world. Useful in devtools.

Set the security origin, content security policy and name of the isolated world. Note: If the csp is specified, then the securityOrigin also has to be specified.

webFrame.getResourceUsage()​

Возвращает Object:

Возвращает объект, описывающий сведения об использовании Blink внутренней памяти кэшей.

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

Это будет генерировать:

{
  images: {
    count: 22,
    size: 2549,
    liveSize: 2542
  },
  cssStyleSheets: { /* то же самое с "images" */ },
  xslStyleSheets: { /* то же самое с "images" */ },
  fonts: { /* то же самое с "images" */ },
  other: { /* то же самое с "images" */ }
}

webFrame.clearCache()​

Пытается освободить память, которая больше не используется (например, изображения из предыдущей навигации).

Обратите внимание, что безрассудный вызов этого метода вероятно замедлит Electron, поскольку ему придется чистить кэши даже если они уже пустые, так что этот метод следует вызывать только в случае, когда вы уверены, что страница стала использовать меньше памяти (например, произошел переход с супер-тяжёлой страницы на лёгкую без ожидаемого возврата обратно на тяжёлую).

webFrame.getFrameForSelector(selector)​

  • selector string - CSS selector for a frame element.

Returns WebFrame - The frame element in webFrame's document selected by selector, null would be returned if selector does not select a frame or if the frame is not in the current renderer process.

webFrame.findFrameByName(name)​

  • name string

Returns WebFrame - A child of webFrame with the supplied name, null would be returned if there's no such frame or if the frame is not in the current renderer process.

webFrame.findFrameByRoutingId(routingId)​

  • routingId Integer - An Integer representing the unique frame id in the current renderer process. Routing IDs can be retrieved from WebFrame instances (webFrame.routingId) and are also passed by frame specific WebContents navigation events (e.g. did-frame-navigate)

Returns WebFrame - that has the supplied routingId, null if not found.

webFrame.isWordMisspelled(word)​

  • word string - The word to be spellchecked.

Returns boolean - True if the word is misspelled according to the built in spellchecker, false otherwise. If no dictionary is loaded, always return false.

webFrame.getWordSuggestions(word)​

  • word string - The misspelled word.

Returns string[] - A list of suggested words for a given word. If the word is spelled correctly, the result will be empty.

Свойства​

webFrame.top Только чтение​

A WebFrame | null representing top frame in frame hierarchy to which webFrame belongs, the property would be null if top frame is not in the current renderer process.

webFrame.opener Только чтение​

A WebFrame | null representing the frame which opened webFrame, the property would be null if there's no opener or opener is not in the current renderer process.

webFrame.parent Только чтение​

A WebFrame | null representing parent frame of webFrame, the property would be null if webFrame is top or parent is not in the current renderer process.

webFrame.firstChild Только чтение​

A WebFrame | null representing the first child frame of webFrame, the property would be null if webFrame has no children or if first child is not in the current renderer process.

webFrame.nextSibling Только чтение​

A WebFrame | null representing next sibling frame, the property would be null if webFrame is the last frame in its parent or if the next sibling is not in the current renderer process.

webFrame.routingId Только чтение​

An Integer representing the unique frame id in the current renderer process. Distinct WebFrame instances that refer to the same underlying frame will have the same routingId.