97 lines
2.9 KiB
Markdown
97 lines
2.9 KiB
Markdown
## Class: Debugger
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> An alternate transport for Chrome's remote debugging protocol.
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Process: [Main](../glossary.md#main-process)
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Chrome Developer Tools has a [special binding][rdp] available at JavaScript
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runtime that allows interacting with pages and instrumenting them.
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```javascript
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const { BrowserWindow } = require('electron')
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let win = new BrowserWindow()
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try {
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win.webContents.debugger.attach('1.1')
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} catch (err) {
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console.log('Debugger attach failed : ', err)
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}
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win.webContents.debugger.on('detach', (event, reason) => {
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console.log('Debugger detached due to : ', reason)
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})
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win.webContents.debugger.on('message', (event, method, params) => {
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if (method === 'Network.requestWillBeSent') {
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if (params.request.url === 'https://www.github.com') {
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win.webContents.debugger.detach()
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}
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}
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})
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win.webContents.debugger.sendCommand('Network.enable')
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```
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### Instance Methods
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#### `debugger.attach([protocolVersion])`
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* `protocolVersion` String (optional) - Requested debugging protocol version.
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Attaches the debugger to the `webContents`.
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#### `debugger.isAttached()`
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Returns `Boolean` - Whether a debugger is attached to the `webContents`.
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#### `debugger.detach()`
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Detaches the debugger from the `webContents`.
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#### `debugger.sendCommand(method[, commandParams, callback])`
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* `method` String - Method name, should be one of the methods defined by the
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[remote debugging protocol][rdp].
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* `commandParams` Object (optional) - JSON object with request parameters.
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* `callback` Function (optional) - Response
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* `error` Object - Error message indicating the failure of the command.
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* `result` Any - Response defined by the 'returns' attribute of
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the command description in the remote debugging protocol.
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Send given command to the debugging target.
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**[Deprecated Soon](modernization/promisification.md)**
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#### `debugger.sendCommand(method[, commandParams])`
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* `method` String - Method name, should be one of the methods defined by the
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[remote debugging protocol][rdp].
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* `commandParams` Object (optional) - JSON object with request parameters.
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Returns `Promise<any>` - A promise that resolves with the response defined by
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the 'returns' attribute of the command description in the remote debugging protocol
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or is rejected indicating the failure of the command.
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Send given command to the debugging target.
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### Instance Events
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#### Event: 'detach'
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* `event` Event
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* `reason` String - Reason for detaching debugger.
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Emitted when debugging session is terminated. This happens either when
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`webContents` is closed or devtools is invoked for the attached `webContents`.
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#### Event: 'message'
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* `event` Event
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* `method` String - Method name.
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* `params` Object - Event parameters defined by the 'parameters'
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attribute in the remote debugging protocol.
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Emitted whenever debugging target issues instrumentation event.
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[rdp]: https://chromedevtools.github.io/devtools-protocol/
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[`webContents.findInPage`]: web-contents.md#contentsfindinpagetext-options
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