[![Build Status](https://travis-ci.org/brenden/node-webshot.svg?branch=master)](https://travis-ci.org/brenden/node-webshot) # node-webshot Webshot provides a simple API for taking webpage screenshots. The module is a light wrapper around PhantomJS, which utilizes WebKit to perform the page rendering. ## Examples A simple url example: ```javascript var webshot = require('webshot'); webshot('google.com', 'google.png', function(err) { // screenshot now saved to google.png }); ``` An html example: ```javascript var webshot = require('webshot'); webshot('Hello World', 'hello_world.png', {siteType:'html'}, function(err) { // screenshot now saved to hello_world.png }); ``` Alternately, the screenshot can be streamed back to the caller: ```javascript var webshot = require('webshot'); var fs = require('fs'); var renderStream = webshot('google.com'); var file = fs.createWriteStream('google.png', {encoding: 'binary'}); renderStream.on('data', function(data) { file.write(data.toString('binary'), 'binary'); }); ``` An example showing how to take a screenshot of a site's mobile version: ```javascript var webshot = require('webshot'); var options = { screenSize: { width: 320 , height: 480 } , shotSize: { width: 320 , height: 'all' } , userAgent: 'Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_2 like Mac OS X; en-us)' + ' AppleWebKit/531.21.20 (KHTML, like Gecko) Mobile/7B298g' }; webshot('flickr.com', 'flickr.jpeg', options, function(err) { // screenshot now saved to flickr.jpeg }); ``` ## Options An optional `options` object can be passed as the parameter directly preceding the callback in a call to webshot.
Option Default Value Description
{ width: 1024
, height: 768 }
The dimensions of the browser window. screenSize is an alias for this property.
{ width: 'window'
, height: 'window' }
The area of the page document, starting at the upper left corner, to render. Possible values are 'screen', 'all', and a number defining a pixel length.

'window' causes the length to be set to the length of the window (i.e. the shot displays what is initially visible within the browser window).

'all' causes the length to be set to the length of the document along the given dimension.
{ left: 0
, right: 0
, top: 0
, bottom: 0 }
The left and top offsets define the upper left corner of the screenshot rectangle. The right and bottom offsets allow pixels to be removed from the shotSize dimensions (e.g. a shotSize height of 'all' with a bottom offset of 30 would cause all but the last 30 rows of pixels on the site to be rendered).
phantomPath 'phantomjs' The location of phantomjs. Webshot tries to use the binary provided by the phantomjs NPM module, and falls back to 'phantomjs' if the module isn't available.
phantomConfig {} Object with key value pairs corresponding to phantomjs command line options. Don't include `--`. For example: `phantomConfig: {'ignore-ssl-errors': 'true'}`
cookies [] List of cookie objects to use, or null to disable cookies.
customHeaders null Any additional headers to be sent in the HTTP request.
defaultWhiteBackground false When taking the screenshot, adds a white background if not defined elsewhere.
customCSS '' When taking the screenshot, adds custom CSS rules if defined.
quality 75 JPEG compression quality. A higher number will look better, but creates a larger file. Quality setting has no effect when streaming.
streamType 'png' If streaming is used, this designates the file format of the streamed rendering. Possible values are 'png', 'jpg', and 'jpeg'.
siteType 'url' siteType indicates whether the content needs to be requested ('url'), loaded locally ('file'), or is being provided directly as a string ('html').
renderDelay 0 Number of milliseconds to wait after a page loads before taking the screenshot.
timeout 0 Number of milliseconds to wait before killing the phantomjs process and assuming webshotting has failed. (0 is no timeout.)
takeShotOnCallback false Wait for the web page to signal to webshot when to take the photo using window.callPhantom('takeShot');
errorIfStatusIsNot200 false If the loaded page has a non-200 status code, don't take a screenshot, cause an error instead.
errorIfJSException false If a script on the page throws an exception, don't take a screenshot, cause an error instead.
captureSelector false Captures the page area containing the provided selector and saves it to file.
### PhantomJS version By default this package installs PhantomJS 1.9.x. Several issues exist in this version that are fixed in v2, but v2 is not yet stable across all platforms. The `phantomPath` option can be used to get around this if you want to try a more recent PhantomJS version. See this issue: https://github.com/brenden/node-webshot/issues/100 ### Phantom page properties In addition to these options, the following options can be specified and will be passed to the [Phantom page object](https://github.com/ariya/phantomjs/wiki/API-Reference-WebPage): `paperSize`, `zoomFactor`, `cookies`, `customHeaders`, and `settings`. ### Phantom callbacks Arbitrary scripts can be run on the page before it gets rendered by using any of Phantom's [page callbacks](https://github.com/ariya/phantomjs/wiki/API-Reference-WebPage#callbacks-list), such as `onLoadFinished` or `onResourceRequested`. For example, the script below changes the text of every link on the page: ```javascript var options = { onLoadFinished: function() { var links = document.getElementsByTagName('a'); for (var i=0; i