bfn-webshot
v1.1.0
Published
Easy website screenshots
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brandouelletteReadme
bfn-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:
var webshot = require('webshot');
webshot('google.com', 'google.png', function(err) {
// screenshot now saved to google.png
});An html example:
var webshot = require('webshot');
webshot('<html><body>Hello World</body></html>', 'hello_world.png', {siteType:'html'}, function(err) {
// screenshot now saved to hello_world.png
});Alternately, the screenshot can be streamed back to the caller:
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:
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.
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:
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,
such as onLoadFinished or onResourceRequested. For example, the script below
changes the text of every link on the page:
var options = {
onLoadFinished: function() {
var links = document.getElementsByTagName('a');
for (var i=0; i<links.length; i++) {
var link = links[i];
link.innerHTML = 'My custom text';
}
}
};Note that the script will be serialized and then passed to Phantom as text, so all variable scope information will be lost. However, variables from the caller can be passed into the script as follows:
var options = {
onLoadFinished: {
fn: function() {
var links = document.getElementsByTagName('a');
for (var i=0; i<links.length; i++) {
var link = links[i];
link.innerHTML = this.foo;
}
}
, context: {foo: 'My custom text'}
}
};Tests
Tests are written with Mocha and can be
run with npm test. The tests use node-imagemagick and thus require
that the imagemagick CLI tools be installed.
Running on Heroku
Grunt
grunt-webshot is a Grunt wrapper for this package.