Example: Array.prototype.forEachWebPage() for easy loading and processing of multiple URLs in Phantom.js

examples/cycle_multiple_urls.js

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+/*+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Cycle array of URLs and process with phantom.js
+ Adds Array.prototype.forEachWebPage() iterator.
+
+ EXAMPLE:
+ Save screenshots. Command line:
+ phantomjs phantom_js_url_cycle.js ./screenshots
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+    [
+    
+      'www.google.com',
+      'www.bbc.co.uk',
+      'www.phantomjs.org' 
+      
+    ].forEachWebPage(function (url) {
+      var out_dir = phantom.args[0] || '.';
+      var file_name = [out_dir, url + '.png'].join('/'); // ./screenshots/www.google.com.png
+      phantom.render(file_name);
+      console.log('Generated ' + file_name);
+    });
+    
+-------------------------- */
+var UrlCycle = (function () {
+  
+  function extend (target, source) {
+    for(var i in source) {
+      target[i] = source[i];
+    }
+  }
+  
+  var prot = 'http://', urls, opts = {width: 800, height: 600};
+  
+  function cycle (urls, o, callback) {
+    if(phantom.state.length === 0){ // first pass
+      urls = urls;
+      extend(opts, o || {});
+      phantom.viewportSize = { width: opts.width, height: opts.height };
+      phantom.state = 0;
+      phantom.userAgent = 'Phantom.js bot';
+      phantom.open(prot + urls[phantom.state]);
+    } else { // page open
+      
+      callback(urls[phantom.state]);
+      
+      if(next_url = urls[++phantom.state]) {
+        console.log('opening '+next_url)
+        phantom.open(prot+next_url);
+      } else {
+        console.log('Done. Bye!')
+        phantom.exit();
+      }
+    }
+  }
+  
+  Array.prototype.forEachWebPage = function (callback, opts) {
+    cycle(this, opts, callback);
+  }
+  
+  return {
+    cycle: cycle
+  };
+
+})();