webcap
v0.18.0
Published
Easy website screenshots
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Webcap
Webcap (for web screen capture) is a fork of node-webshot which appears to be dead unfortunately. This forks adds:
- Streams now emits errors instead of ending silently
Webcap 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 webcap = require('webcap');
webcap('google.com', 'google.png', function(err) {
// screenshot now saved to google.png
});An html example:
var webcap = require('webcap');
webcap('<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 webcap = require('webcap');
var fs = require('fs');
var renderStream = webcap('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 webcap = require('webcap');
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'
};
webcap('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 webcap.
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
License
(The MIT License)
Copyright (c) 2012 Brenden Kokoszka & contributors
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the 'Software'), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.