bbcshots.js
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/*
Create a mosaic image from all headline photos on BBC homepage
*/
var casper = require('casper').create();
var nbLinks = 0;
var currentLink = 1;
var images = [];
casper.hide = function(selector) {
this.evaluate(function(selector) {
document.querySelector(selector).style.display = "none";
}, {
selector: selector
});
};
casper.start('http://www.bbc.co.uk/', function() {
nbLinks = this.evaluate(function() {
return __utils__.findAll('#promo2_carousel_items_items li').length;
});
this.echo("" + nbLinks + " items founds");
// hide navigation arrows
this.hide('.nav_left');
this.hide('.nav_right');
this.mouse.move('#promo2_carousel');
this.waitUntilVisible('.autoplay.nav_pause', function() {
this.echo('Moving over pause button');
this.mouse.move('.autoplay.nav_pause');
this.click('.autoplay.nav_pause');
this.echo('Clicked on pause button');
this.waitUntilVisible('.autoplay.nav_play', function() {
this.echo('Carousel has been paused');
// hide play button
this.hide('.autoplay');
});
});
});
var next = function() {
var image = "bbcshot" + currentLink + ".png";
images.push(image);
this.echo("Processing image " + currentLink);
this.captureSelector(image, '.carousel_viewport');
if (currentLink < nbLinks) {
this.click(".carousel_itemList_li[rel='" + currentLink + "']");
this.wait(1000, function() {
this.then(next);
currentLink++;
});
} else {
this.then(buildPage);
}
};
var buildPage = function() {
this.echo('Build result page');
var fs = require('fs');
this.viewport(624, 400);
var pageHtml = "<html><body style='background:black;margin:0;padding:0'>";
images.forEach(function(image) {
pageHtml += "<img src='file://" + fs.workingDirectory + "/" + image + "'><br>";
});
pageHtml += "</body></html>";
fs.write('result.html', pageHtml, 'w');
this.thenOpen("file://" + fs.workingDirectory + "/result.html", function() {
this.echo('Resulting image saved to result.png');
this.capture('result.png');
});
};
casper.then(next);
casper.run();