Skip to content

Instantly share code, notes, and snippets.

@nhoizey
Created November 12, 2012 17:07
Show Gist options
  • Save nhoizey/4060568 to your computer and use it in GitHub Desktop.
Save nhoizey/4060568 to your computer and use it in GitHub Desktop.
Take screenshots at different viewport sizes using CasperJS
/*
* Takes provided URL passed as argument and make screenshots of this page with several viewport sizes.
* These viewport sizes are arbitrary, taken from iPhone & iPad specs, modify the array as needed
*
* Usage:
* $ casperjs screenshots.js http://example.com
*/
var casper = require("casper").create();
var screenshotUrl = 'http://google.com/',
screenshotNow = new Date(),
screenshotDateTime = screenshotNow.getFullYear() + pad(screenshotNow.getMonth() + 1) + pad(screenshotNow.getDate()) + '-' + pad(screenshotNow.getHours()) + pad(screenshotNow.getMinutes()) + pad(screenshotNow.getSeconds()),
viewports = [
{
'name': 'smartphone-portrait',
'viewport': {width: 320, height: 480}
},
{
'name': 'smartphone-landscape',
'viewport': {width: 480, height: 320}
},
{
'name': 'tablet-portrait',
'viewport': {width: 768, height: 1024}
},
{
'name': 'tablet-landscape',
'viewport': {width: 1024, height: 768}
},
{
'name': 'desktop-standard',
'viewport': {width: 1280, height: 1024}
}
];
if (casper.cli.args.length < 1) {
casper
.echo("Usage: $ casperjs screenshots.js http://example.com")
.exit(1)
;
} else {
screenshotUrl = casper.cli.args[0];
}
casper.start(screenshotUrl, function() {
this.echo('Current location is ' + this.getCurrentUrl(), 'info');
});
casper.each(viewports, function(casper, viewport) {
this.then(function() {
this.viewport(viewport.viewport.width, viewport.viewport.height);
});
this.thenOpen(screenshotUrl, function() {
this.wait(5000);
});
this.then(function(){
this.echo('Screenshot for ' + viewport.name + ' (' + viewport.viewport.width + 'x' + viewport.viewport.height + ')', 'info');
this.capture('screenshots/' + screenshotDateTime + '/' + viewport.name + '-' + viewport.viewport.width + 'x' + viewport.viewport.height + '.png', {
top: 0,
left: 0,
width: viewport.viewport.width,
height: viewport.viewport.height
});
});
});
casper.run();
function pad(number) {
var r = String(number);
if ( r.length === 1 ) {
r = '0' + r;
}
return r;
}
@dpashkevich
Copy link

Do you know if I can specify automatic height so that I always get screenshots of the entire page, no matter how long it is?

@dpashkevich
Copy link

Nevermind, I just don't specify the clipRect argument. I thought that setting viewport dimensions automatically clip the "visible" area

@dpashkevich
Copy link

Why wait for 5 seconds? It really slows down your automated scripts if you want to take screenshots of multiple pages at different viewport sizes. It shouldn't be necessary unless you're waiting for some initial animation to kick in.

@spacebeers
Copy link

Very very nice.

@aristretto
Copy link

@dpashkevich, probably to make sure external dependencies have loaded

@augbog
Copy link

augbog commented Jun 8, 2015

Just a note if you are seeing a blank screen come out, it might be because of SSL protocol. CasperJS and PhantomJS both allow you to specify --ssl-protocol=any to cirvumvent that. See here

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment