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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.
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.
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