How can I scroll page in php-webdriver? - php

Question

I'm trying to get some screenshot using php-driver. And it appears that despite taking the picture of the entire web page, it just taking the picture that appears on the monitor/screen (that's why we call it screenshot).
So my question is how to capture a picture that located in the bottom of the page? Do we scroll the page to the specified element? or there is a way to take the picture of the entire page?
This is my screenshot code:
$host = 'http://localhost:4444/wd/hub'; // this is the default
$capabilities = DesiredCapabilities::firefox();
$webdriver = RemoteWebDriver::create($host, $capabilities, 5000);
function find_image($url) {
//Screenshot
$GLOBALS["webdriver"]->get($url);
$element = $GLOBALS["webdriver"]->findElement(WebDriverBy::cssSelector('#law > p > img'));
$element_width = $element->getSize()->getWidth();
$element_height = $element->getSize()->getHeight();
$element_x = $element->getLocation()->getX();
$element_y = $element->getLocation()->getY();
$screenshot = __DIR__ . "/number/" . count($GLOBALS["data"]) . ".png";
$GLOBALS["webdriver"]->takeScreenshot($screenshot);
$src = imagecreatefrompng($screenshot);
$dest = imagecreatetruecolor($element_width, $element_height);
imagecopy($dest, $src, 0, 0, $element_x, $element_y, $element_width, $element_height);
imagepng($dest, $screenshot);
return convert_image($screenshot);
}

Answer 1

As you say, you can't take a screenshot of anything more than is on the current screen. But you can scroll the window to the bottom of the page.
$this->webDriver->executeScript('window.scrollTo(0,document.body.scrollHeight);');
$this->webDriver->takeScreenshot("a.png");
I use an instance variable for the webDriver, using GLOBALS isn't a particularly good way of using it (IMHO).
You can pass it in as a variable, or use it as a parameter to a constructor if using a class.