Selenium RC: How to click buttons that use onclick window.location?

I have a button (outside of a form) that redirects to another page using the onclick attribute that calls window.location to redirect the user to another page. This time I can't change the HTML. I am using Safari 4 for testing. How can I click a button that uses the onclick attribute and window.location to redirect using Safari 4 and Selenium RC PHPUnit Extension?

Here's my HTML:

<input type="button" oncli开发者_运维知识库ck="window.location='/registrations/new'" value="Start a new registration" id="create">

Update: Alternatively, I'm thinking about doing something where I assert that a location is specified in the window.location='', store that location, and call the open() command using that location. Not sure if this is an acceptable approach to testing this.

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We decided to extend the default clickAndWait() functionality to call openAndWait() if the button has an onclick="window.location='/something';"

/**
 * Extends original clickAndWait() functionality to provide the ability to click buttons that use window.location to redirect users
 * @param $locator
 */
public function clickAndWait($locator)
{
    $this->assertElementPresent($locator);
    $hasOnclickAttribute = $this->getEval('this.browserbot.findElement("' . $locator . '").hasAttribute("onclick")');
    if ($hasOnclickAttribute === 'true') {
        $onclickValue = $this->getAttribute("$locator@onclick");
        if (strpos($onclickValue, "window.location=") !== false) {

            // Clean up the location
            $temp = explode("=" , $onclickValue);               
            $location = trim($temp[1], "';");               
            $location = trim($location, '"');

            return $this->openAndWait($location);
        }
    }
    return parent::clickAndWait($locator);
}

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This should work, however you could also try firing the click event using the fireEvent command.

selenium.fireEvent("id=create", "click");