Selenium Webdriver 等待预期条件失败：等待 By.id 定位的元素的可见性

Question

我正在尝试让 selenium web 驱动程序等待，但我总是遇到异常“

org.openqa.selenium.TimeoutException：预期条件失败：等待 By.id 定位的元素的可见性：mobileNo（尝试 20 秒，间隔 100 毫秒）”。

我将秒数增加到 100，然后也遇到了同样的问题，我的 id 是正确的。

    WebDriver d = new ChromeDriver();
    d.get("http://myurlOne");
    WebElement username = d.findElement(By.id("username_id"));          
    username.sendKeys("123");
    WebElement password = d.findElement(By.id("password_id"));
    password.sendKeys("123");
    d.findElement(By.id("loginButton")).click();
    System.out.println("logged in successfully");
    d.get("http://navigatedurl");
    JavascriptExecutor js = (JavascriptExecutor)d;  
    System.out.println("navigated to new page"); 
    WebDriverWait wait__mob = new WebDriverWait(d, 20);
    try {
        System.out.println("Start"+new Date());
        wait__mob .pollingEvery(100,TimeUnit.MILLISECONDS).until(ExpectedConditions.visibilityOfElementLocated(By.id("mobileNo")));
        d.findElement(By.id("mobileNo")).sendKeys("99999999999);
    } catch (TimeoutException e) {
        // TODO: handle exception
        System.out.println(e.toString());
    } 

分区代码：

 <div class="form-group">
   <label class="col-xs-5 control-label" for="mobileNo">Mobile No.</label>
     <div class="col-xs-6 leftpadding-none">
        <input type="tel" class="form-control k-input" id="mobileNo" 
       name="inputmobileNo" placeholder="" maxlength="10"> <!--required 
       pattern="\d{10}" validationMessage="Mobile No. is Required"-->
  </div>

Answer 1

根据WebDriverWait 类的Java Docs，如果你想改变轮询间隔，你需要在构造函数中改变它因为构造函数如下：

WebDriverWait(WebDriver driver, long timeOutInSeconds, long sleepInMillis)

Wait will ignore instances of NotFoundException that are encountered (thrown) by default in the 'until' condition, and immediately propagate all others.

在您尝试在需要调用ExpectedConditions 方法elementToBeClickable 的元素上调用sendKeys() 时向前推进。

所以你的代码将是：

WebDriver d = new ChromeDriver();
d.get("http://myurlOne");
WebElement username = d.findElement(By.id("username_id"));          
username.sendKeys("123");
WebElement password = d.findElement(By.id("password_id"));
password.sendKeys("123");
d.findElement(By.id("loginButton")).click();
System.out.println("logged in successfully");
d.get("http://navigatedurl");
System.out.println("navigated to new page"); 
WebDriverWait wait__mob = new WebDriverWait(d, 20);
try {
    System.out.println("Start"+new Date());
    wait__mob.until(ExpectedConditions.elementToBeClickable(By.xpath("//div[@class='form-group']//label[contains(.,'Mobile No.')]//following::div[1]/input[@class='form-control k-input' and @id='mobileNo' and @type='tel']"))).sendKeys("9999999999);
} catch (TimeoutException e) {
    System.out.println(e.toString());
}