Selenium executeScript fails sometimes - selenium

Question

i've created the following function to click elements
private WebDriverWait wait;
public void clickElement(By element) throws InterruptedException {
// wait element is clickable
wait.until(ExpectedConditions.presenceOfElementLocated(element));
// driver.findElement(element).click();
((JavascriptExecutor) driver).executeScript("arguments[0].click();", driver.findElement(element));
waitForAjaxLoadScreenDisappear();
}
we click thousands of elements, but sometimes randomly an error occurs:
arguments[0] is undefined Command duration or timeout: 223 milliseconds Build info: version: '2.45.0', revision: '5017cb8e7ca8e37638dc3091b2440b90a1d8686f', time: '2015-02-27 09:10:26' System info: host: 'linux-1au3', ip: '192.168.1.194', os.name: 'Linux', os.arch: 'amd64', os.version: '3.1.10-1.23.1-desktop', java.version: '1.7.0_21' Session ID: 471aca55-ae19-439e-aaa2-b2ba970a1252 Driver info: org.openqa.selenium.firefox.FirefoxDriver Capabilities [{platform=LINUX, acceptSslCerts=true, javascriptEnabled=true, cssSelectorsEnabled=true, databaseEnabled=true, browserName=firefox, handlesAlerts=true, browserConnectionEnabled=true, nativeEvents=false, webStorageEnabled=true, rotatable=false, locationContextEnabled=true, applicationCacheEnabled=true, takesScreenshot=true, version=20.0}]
How can arguments[0] be undefined, when the wait.until has finished?

Answer 1

usually buttons have enable/disable attributes, so along with asserting it's visible you also might want to check if they are clickable/enabled...
you should be able to do something like the below:
element.isEnabled()
Then you probably want to loop until it's true before interacting with the element...