PhantomJS - Examples


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In this chapter, we are providing a few more practical examples to understand some important features of PhantomJS.

Example 1 - Find the Page Speed

In this example, we will use PhantomJS to find the page speed for any given page URL.

var page = require('webpage').create(), 
   system = require('system'), 
   t, address;  

if (system.args.length === 1) { 
   console.log('Usage: loadspeed.js <some URL>'); 
   phantom.exit(1); 
} else { 
   t = Date.now(); 
   address = system.args[1]; 
   
   page.open(address, function (status) { 
      if (status !== 'success') { 
         console.log('FAIL to load the address'); 
      } else { 
         t = Date.now() - t; 
         
         console.log('Page title is ' + page.evaluate(function () { 
            return document.title; 
         })); 
         console.log('Loading time ' + t + ' msec'); 
      } 
      phantom.exit(); 
   }); 
}

The above program generates the following output.

Command − phantomjs pagespeed.js http://www.google.com

Page title is Google 
Loading time 1396 msec 

Example 2 - Send a Click Event to a Page

In the following example, we will use PhantomJS to send a click event to a page.

var page = require('webpage').create(); 
page.onConsoleMessage = function(str) { 
   console.log(str); 
} 
page.open('http://phantomjs.org/api/phantom/', function(status) { 
   page.render('beforeclick.png'); 
   console.log(page.url); 
   
   var element = page.evaluate(function() {   
      return document.querySelector('img[src = "http://phantomjs.org/img/phantomjslogo.png"]'); 
   }); 
   page.sendEvent('click', element.offsetLeft, element.offsetTop, 'left'); 
   
   window.setTimeout(function () { 
      console.log(page.url); 
      page.render('afterclick.png'); 
      phantom.exit(); 
   }, 5000); 
   console.log('element is ' + element); 
}); 

The above program generates the following output.

http://phantomjs.org/api/phantom/ 
element is [object Object] 
http://phantomjs.org/

Our program will create the following two png images in the bin folder. These two images show the difference before and after the execution of the above program.

Before Click

Optimal Solution

Example 3 - Submit a Form

The following example shows how to submit a form using PhantomJS.

var wpage = require('webpage').create();  
wpage.open("http://localhost/tasks/submitform.html", function(status) { 
   console.log(status); 
   wpage.uploadFile('input[name = fileToUpload]', 'output.png'); 
   wpage.render("sform.png");  
   
   var element = wpage.evaluate(function() {   
      return document.querySelector('input[type = "submit"]');   
      // getting details of submit button using queryselector. 
   }); 
   wpage.sendEvent('click', element.offsetLeft, element.offsetTop, 'left');  
   
   // sendevent is used to send click event and also giving the left and top 
      position of the submit button. 
   
   window.setTimeout(function () { 
      console.log(wpage.url); 
      wpage.render("submit.png");  // screenshot is saved in submit.png 
      phantom.exit(); 
   }, 5000);  
   console.log('element is ' + element);  
});

submitform.html

The following code shows how to use the submitform.html file.

<html> 
   <head>
      <title>Window 2</title>
   </head> 

   <body>
      <form action = "submitform.php" method = "post" enctype = "multipart/form-data" 
         id = "form1">  
         <input type = "file" name = "fileToUpload" id = "fileToUpload"> 
         <input type = "submit" value = "Upload Image" name = "submit"> 
      </form> 
   </body>  
   
</html>

Once the form is submitted, it goes to submitform.php.

submitform.php

submitform.php is just printing the details of the files.

<?php 
   print_r($_FILES); 
?> 

The above program generates the following output.

Success 
element is [object Object] 
http://localhost/tasks/submitform.php 

Images

Following are the images for file upload and form submit.

File Upload

Form Submit

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