84

I'm looking for something similar to waitForElementPresent to check whether element is displayed before I click it. I thought this can be done by implicitWait, so I used the following:

driver.manage().timeouts().implicitlyWait(5, TimeUnit.SECONDS);

and then click by

driver.findElement(By.id(prop.getProperty(vName))).click();

Unfortunately, sometimes it waits for the element and sometimes not. I looked for a while and found this solution :

for (int second = 0;; second++) {
    Thread.sleep(sleepTime);
    if (second >= 10)
        fail("timeout : " + vName);
    try {
        if (driver.findElement(By.id(prop.getProperty(vName))).isDisplayed())
            break;
    } catch (Exception e) {
        writeToExcel("data.xls", e.toString(), parameters.currentTestRow, 46);
    }
}
driver.findElement(By.id(prop.getProperty(vName))).click();

And it waited all right, but before timing out it had to wait 10 times 5, 50 seconds. A bit much. So I set the implicitly wait to 1sec and all seemed fine until now. Because now some things wait 10s before timeout but some other things time out after 1s.

How do you cover the waiting for element present/visible in your code? Any hint is appreciable.

4

4 回答 4

166

This is how I do it in my code.

WebDriverWait wait = new WebDriverWait(webDriver, timeoutInSeconds);
wait.until(ExpectedConditions.visibilityOfElementLocated(By.id<locator>));

or

wait.until(ExpectedConditions.elementToBeClickable(By.id<locator>));

to be precise.

See also:

于 2012-07-31T10:55:38.827 回答
13

You can use Explicit wait or Fluent Wait

Example of Explicit Wait -

WebDriverWait wait = new WebDriverWait(WebDriverRefrence,20);
WebElement aboutMe;
aboutMe= wait.until(ExpectedConditions.visibilityOfElementLocated(By.id("about_me")));

Example of Fluent Wait -

Wait<WebDriver> wait = new FluentWait<WebDriver>(driver)                            
.withTimeout(20, TimeUnit.SECONDS)          
.pollingEvery(5, TimeUnit.SECONDS)          
.ignoring(NoSuchElementException.class);    

  WebElement aboutMe= wait.until(new Function<WebDriver, WebElement>() {       
public WebElement apply(WebDriver driver) { 
return driver.findElement(By.id("about_me"));     
 }  
});

Check this TUTORIAL for more details.

于 2016-10-25T13:02:31.367 回答
5

We're having a lot of race conditions with elementToBeClickable. See https://github.com/angular/protractor/issues/2313. Something along these lines worked reasonably well even if a little brute force

Awaitility.await()
        .atMost(timeout)
        .ignoreException(NoSuchElementException.class)
        .ignoreExceptionsMatching(
            Matchers.allOf(
                Matchers.instanceOf(WebDriverException.class),
                Matchers.hasProperty(
                    "message",
                    Matchers.containsString("is not clickable at point")
                )
            )
        ).until(
            () -> {
                this.driver.findElement(locator).click();
                return true;
            },
            Matchers.is(true)
        );
于 2017-07-24T07:20:47.940 回答
-5

Above wait statement is a nice example of Explicit wait.

As Explicit waits are intelligent waits that are confined to a particular web element(as mentioned in above x-path).

By Using explicit waits you are basically telling WebDriver at the max it is to wait for X units(whatever you have given as timeoutInSeconds) of time before it gives up.

于 2014-10-27T04:14:21.347 回答