Selenium webdriver循环错误：ObsoleteElementWebDriverError

Question

I'm currently creating a unit test to be implemented in a website using Selenium and Facebook's php-webdriver. I am trying to go through all hyperlinks and verify if they work correctly using the following code:

$this->webDriver->get($this->url);
    $results = $this->webDriver->findElements(WebDriverBy::cssSelector('a'));

    for($i = 0; $i < count($results); $i++)
    {
        $this->webDriver->get($results[$i]->getAttribute('href'));
        echo $this->webDriver->getTitle() . "
";
        $this->webDriver->navigate()->back();
    }

The problem that occurs is that after the first "get" the unit test exits with the following error:

ObsoleteElementWebDriverError on
#4 C:\xampp\htdocs\php-webdriver-demo-master\tests\GitHubTest.php(63): RemoteWebElement->getAttribute('href')
#5 [internal function]: GitHubTest->testSearch()

When I don't switch from page, for example, when I just echo the title throughout the whole loop it loops perfectly. But as soon as I add an action it stops working. I've tried implementing "wait" but without any luck, it still throws the same error. Also, the code works perfectly when just running it once and not looping.. I can't seem to figure it out and have been crunching for a few hours now.. do you have any ideas?

Answer 1

You can persist hrefs before loading other pages.

$this->webDriver->get($this->url);

$results = $this->webDriver->findElements(WebDriverBy::cssSelector('a'));
$hrefs = array();
for($i = 0; $i < count($results); $i++)
{
    $hrefs[] = $results[$i]->getAttribute('href');
}

for($i = 0; $i < count($hrefs); $i++)
{
    $this->webDriver->get($hrefs[$i]);
    echo $this->webDriver->getTitle() . "
";
    $this->webDriver->navigate()->back();
}

Moreover, it is not necessary to use navigate()->back();