Selenium-如果下拉列表值已经存在，如何检查并增加下拉列表值？

Question

这是我当前的代码，其中我手动选择每个下拉列表并选择它们各自的值。：

driver.findElement(By.id("addPage")).click();
new Select(driver.findElement(By.id("page0"))).selectByVisibleText("ABCD");
driver.findElement(By.id("addPage")).click();
Thread.sleep(1000);
new Select(driver.findElement(By.id("page1"))).selectByVisibleText("CDEF");
driver.findElement(By.id("addPage")).click();
Thread.sleep(1000);
new Select(driver.findElement(By.id("page2"))).selectByVisibleText("EFGH");
driver.findElement(By.id("addContact")).click();

Answer 1

WebElement existingPage = driver.findElement(By.cssSelector("select[id^=page]"));

String nextPageID = Integer.toString(Integer.parseInt(existingPage.getAttribute("id").replaceAll("\\D+", "")) + 1);
Select nextPage = new Select(driver.findElement(By.id("page" + nextPageID)));

并且，正如@iridann正确指出的，为了检查是否存在，捕获nosuchelementexception异常：

try {
    WebElement existingPage = driver.findElement(By.cssSelector("select[id^=page]"));
    // ...
} catch (NoSuchElementException e) {
    // no pages found
}