Sample code of using phantomjs-node to scrape a web page fully loaded

phantomjs_loadpage.js

var phantom = require('phantom');
var fs = require('fs');


let pageScraper = (function () {
  'use strict';
  let module = {
    content: null,
    onResourceRequested: function (requestData, request) {
      // run in phantomjs runtime: https://github.com/amir20/phantomjs-node#pageon
      // have no access to closure here
      var verbose = true;
      var ignore = false;
      var ignoreReg = [/.*\.css/, /.*\.png/];
      ignoreReg.forEach(function (reg) {
        if (reg.test(requestData.url)) {
          // console.log('The url of the request is matching. Aborting: ' + requestData['url']);
          request.abort();
          ignore = true;
        }
      });
      if (!ignore && verbose) {
        console.log('Requesting', requestData.url);
      }
    },
    checkLoaded: function(page) {
      return new Promise((resolve, reject) => {
        setTimeout(() => {
          resolve();
        }, 200);
      });
    },
    waitPageLoaded: function(page, timeout=30000, period=250) {
      return new Promise((resolve, reject) => {
        let tried = 0;
        let checkResolve = function () {
          tried++;
          console.log("Try: " + tried);
          me.checkLoaded(page)
            .then(() => {
              resolve();
            })
            .catch(() => {
              if (tried >= timeout / period) {
                reject("waitPageLoaded: Time limit exceed");
              } else {
                setTimeout(checkResolve, period);
              }
            });
        };
        checkResolve();
      });
    },
    scrape: function(url) {
      var phInstance = null;
      return new Promise(function (resolve, reject) {
        phantom.create()
          .then(instance => {
            phInstance = instance;
            return instance.createPage();
          })
          .then(page => {
            // run in phantomjs runtime: https://github.com/amir20/phantomjs-node#pageon
            page.on('onResourceRequested', true, me.onResourceRequested);
            console.log("Start loading page..");
            page.open(url)
              .then(status => {
                if (status != "success") {
                  reject("status: " + status);
                } else {
                  me.waitPageLoaded(page)
                    .then(() => {
                      page.property('content').then(content => {
                        me.content = content;
                        phInstance.exit();
                        resolve(content);
                      });
                    })
                    .catch(error => {
                      phInstance.exit();
                      reject(error);
                    });
                }
              });
          })
          .catch(error => {
            phInstance.exit();
            reject(error);
          });
      }); 
    }
  };
  let me = module;
  return module;
})();

// let url = "http://example.org/";
let url = "https://treeofsavior.com/page/class/ranking.php";

pageScraper.checkLoaded = function (page) {
  return new Promise((resolve, reject) => {
    page.evaluate(function () {
      return document.getElementById('classbuild_date').innerHTML;
    }).then(function (html) {
      html = html.trim();
      console.info("innerhtml: " + html);
      if (html != "") {
        resolve();
      } else {
        reject();
      }
    });
  });
},
pageScraper.scrape(url)
  .then(content => {
    // console.log(content);
    fs.writeFileSync('output.html', content);
    console.log("File written to output.html");
  })
  .catch(error => {
    console.log("ScrapeError: " + error);
  });

console.log("hello world");