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Add docs/api.md

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This patch adds docs/api.md file which contains API description
for the puppeteer API. This patch adds the API outline, which
doesn't not have explanations and samples.
This commit is contained in:
Andrey Lushnikov 2017-06-13 00:28:29 -07:00
parent ac3e76fb22
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# Puppeteer API
- [class: Browser](#class-browser)
- [new Browser([options])](#new-browseroptions)
- [browser.newPage()](#browsernewpage)
- [browser.closePage()](#browserclosepage)
- [browser.version()](#browserversion)
- [browser.close()](#browserclose)
- [class: Page](#class-page)
- [page.setBlockedURLs(patterns)](#pagesetblockedurlspatterns)
- [page.addScriptTag(url)](#pageaddscripttagurl)
- [page.injectFile(filePath)](#pageinjectfilefilepath)
- [page.setInPageCallback(name, callback)](#pagesetinpagecallbackname-callback)
- [page.setExtraHTTPHeaders(headers)](#pagesetextrahttpheadersheaders)
- [page.extraHTTPHeaders()](#pageextrahttpheaders)
- [page.setUserAgentOverride(userAgent)](#pagesetuseragentoverrideuseragent)
- [page.userAgentOverride()](#pageuseragentoverride)
- [page.handleDialog(accept, promptText)](#pagehandledialogaccept-prompttext)
- [page.url()](#pageurl)
- [page.setContent(html)](#pagesetcontenthtml)
- [page.navigate(url)](#pagenavigateurl)
- [page.setSize(size)](#pagesetsizesize)
- [page.size()](#pagesize)
- [page.evaluate(fun, args)](#pageevaluatefun-args)
- [page.evaluateAsync(fun, args)](#pageevaluateasyncfun-args)
- [page.evaluateOnInitialized(fun, args)](#pageevaluateoninitializedfun-args)
- [page.screenshot(type[, clipRect])](#pagescreenshottype-cliprect)
- [page.saveScreenshot(filePath[, clipRect])](#pagesavescreenshotfilepath-cliprect)
- [page.printToPDF(filePath[, options])](#pageprinttopdffilepath-options)
- [page.plainText()](#pageplaintext)
- [page.title()](#pagetitle)
- [page.close()](#pageclose)
### class: Browser
Browser manages a browser instance, creating it with a predefined
settings, opening and closing pages. Instantiating Browser class does
not necessarily result in launching browser; the instance will be launched when the need will arise.
#### new Browser([options])
- `options` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) Set of configurable options to set on the browser. Can have the following fields:
- `headless` [<boolean>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type) Wether to run chromium in headless mode. Defaults to `true`.
- `remoteDebuggingPort` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) Specify a remote debugging port to open on chromium instance. Defaults to `9229`.
- `executablePath` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Path to a chromium executable to run instead of bundled chromium.
- `args` [<Array>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) Additional arguments to pass to the chromium instance. List of chromium flags could be found [here](http://peter.sh/experiments/chromium-command-line-switches/).
#### browser.newPage()
- returns: [<Promise<Page>>](http://todo)
Create a new page in browser and returns a promise which gets resolved with a Page object.
#### browser.closePage()
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise)
#### browser.version()
- returns: [<Promise<string>>]((https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type))
#### browser.close()
Closes chromium application with all the pages (if any were opened). The browser object itself is considered to be disposed and could not be used anymore.
### class: Page
Page provides interface to interact with a tab in a browser. Pages are created by browser:
```javascript
var browser = new Browser();
browser.newPage().then(page => {
...
});
```
Pages could be closed by `page.close()` method.
#### page.setBlockedURLs(patterns)
- `patterns` [<Array>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when blocked URLs have been successfully set.
#### page.addScriptTag(url)
- `url` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Url of a script to be added
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves as the script gets added and loads.
#### page.injectFile(filePath)
- `url` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Path to the javascript file to be injected into page.
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when file gets successfully evaluated in page.
#### page.setInPageCallback(name, callback)
- `url` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Name of the callback to be assigned on window object
- `callback` [<Function>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) Callback function which will be called in node.js
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when callback is successfully initialized
#### page.setExtraHTTPHeaders(headers)
- `headers` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) Key-value set of additional http headers to be sent with every request.
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when additional headers are installed
#### page.extraHTTPHeaders()
- returns: [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) Key-value set of additional http headers, which will be sent with every request.
#### page.setUserAgentOverride(userAgent)
- `userAgent` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Specific user agent to use in this page
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when the user agent is set.
#### page.userAgentOverride()
- returns: [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Returns user agent override, if any.
#### page.handleDialog(accept, promptText)
- `accept` [<boolean>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type) Wether accept or discard the dialog.
- `promptText` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Optional text to put inside the text prompt.
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when the dialog is handled.
#### page.url()
- returns: [<Promise<string>>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Promise which resolves with the current page url.
#### page.setContent(html)
- `html` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) HTML markup to assign to the page.
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when the content is successfully assigned.
#### page.navigate(url)
- `url` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) URL to navigate page to
- returns: [<Promise<boolean>>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type) Promise which resolves when the page is navigated. The promise resolves to:
- `true` if the navigation succeeds and page's `load` event is fired.
- `false` if the navigation fails due to bad URL or SSL errors.
#### page.setSize(size)
- `size` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) An object with two fields:
- `width` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) Specify page's width in pixels.
- `height` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) Specify page's height in pixels.
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when the dimensions are updated.
#### page.size()
- returns: [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) An object with two fields:
- `width` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) Page's width in pixels.
- `height` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) Page's height in pixels.
#### page.evaluate(fun, args)
- `fun` [<Function>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) Function to be evaluated in browser context
- `args` [<Array>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) Arguments to pass to `fun`
- returns: [<Promise<Object>>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves to function return value
#### page.evaluateAsync(fun, args)
- `fun` [<Function>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) Function to be evaluated in browser context
- `args` [<Array>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) Arguments to pass to `fun`
- returns: [<Promise<Object>>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves to function
#### page.evaluateOnInitialized(fun, args)
- `fun` [<Function>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function) Function to be evaluated in browser context
- `args` [<Array>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array) Arguments to pass to `fun`
- returns: [<Promise<Object>>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves to function
#### page.screenshot(type[, clipRect])
- `type` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Specify screenshot type, could be either `jpeg` or `png`.
- `clipRect` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) An object which specifies clipping region of the page. Should have the following fields:
- `x` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) x-coordinate of top-left corner of clip area
- `y` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) y-coordinate of top-left corner of clip area
- `width` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) width of clipping area
- `height` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type) height of clipping area
- returns: [<Promise<Buffer>>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves to buffer with captured screenshot
#### page.saveScreenshot(filePath[, clipRect])
- `filePath` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) The file path to save image to. The screenshot type will be inferred from file extension
- `clipRect` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) Clip rect object which will be passed over to `page.screenshot` method.
#### page.printToPDF(filePath[, options])
- `filePath` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) The file path to save image to. The screenshot type will be inferred from file extension
- `options` [<Object>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object) Options object which might have the following properties:
- `scale` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type)
- `displayHeaderFooter` [<boolean>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type)
- `printBackground` [<boolean>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type)
- `landscape` [<boolean>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type)
- `pageRanges` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type)
- `format` [<string>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type)
- `width` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type)
- `height` [<number>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type)
- returns: [<Promise>](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Promise) Promise which resolves when the PDF is saved.
#### page.plainText()
- returns: [<Promise<string>>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Returns page's inner text.
#### page.title()
- returns: [<Promise<string>>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Returns page's title.
#### page.close()
- returns: [<Promise>](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type) Returns promise which resolves when page gets closed.

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@ -404,6 +404,7 @@ class Page extends EventEmitter {
/**
* @param {string} filePath
* @param {!Object=} options
* @return {!Promise}
*/
async printToPDF(filePath, options) {
options = options || {};