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We're using Selenium WebDriver to test a form that has a double-post prevention behavior. There's some simple javascript that disables the button upon click, so that users won't accidentally post the same thing twice.
How do we test this?
The issues is that the button.click() blocks until the next page has loaded, at which point we certainly can't assert anything about the button on the previous page. Even if we were to somehow get the .click() to be non-blocking, there's an inherent race condition; if the browser/javascript is much faster than the test system, it will be able to unload the page before the test can assert anything about the button.
Bonus points for solutions without javascript injection hacks.
610
Based on the assumption that Esc cancels page loading in every browser and OS, this should work:
WebElement input = driver.findElement(By.tagName("input"));
input.sendKeys(Keys.ENTER, Keys.ESCAPE);
Assert.assertFalse(input.isEnabled());
It sends Enter and Esc to the button in rapid succession, so that the JavaScript is fired, but the page load has no chance of kicking in. The only problem I can see is that you won't be able to get to the next page with this test unless you refresh and send a new form. But we should only test one feature at a time anyway, so you're fine ;-).
EDIT (to address your comment)
Actually, yes! You can try to se send a click and the Esc key at the same time via The Advanced User Interactions API (JavaDocs). You can also achieve a nonblocking click this way.
Anyway, this approach still sends two requests which isn't the fastest imaginable thing to do, but it (sometimes barely) passes my test, so you might give it a try:
WebElement input = driver.findElement(By.tagName("input"));
new Actions(driver)
.click(input)
.sendKeys(input, Keys.ESCAPE)
.perform();
Test environment: IE8 and FF18 with a locally stored file and Selenium 2.29.1; Win XP SP3. The test file looks like this:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Test</title>
</head>
<body>
<a href="http://google.com/">
<input type="button" value="Hello." onclick="this.disabled='true';" />
</a>
</body>
</html>
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