问题

尝试从下拉列表中选择一个元素，但在执行过程中出现了以下错误：

> 主线程中的异常"org.openqa.selenium.NoSuchElementException：
> 没有这样的元素：无法定位元素：
> {"method":"xpath","selector":"//select[@id='id12']"}

下拉列表的HTML代码如下：
```html
<select style="width:163px" name="department:department" id="id12">
    <option selected="selected" value="">Escoge</option>
    <option value="100">100</option>
    <option value="999">999</option>
    <option value="800">800</option>
    <option value="700">700</option>
    <option value="600">600</option>
    <option value="540">540</option>
    <option value="500">500</option>
    <option value="400">400</option>
    <option value="345">345</option>
    <option value="280">280</option>
    <option value="270">270</option>
    <option value="264">264</option>
    <option value="262">262</option>
    <option value="251">251</option>
    <option value="201">201</option>
    <option value="82">82</option>
    <option value="81">81</option>
    <option value="50">50</option>
    <option value="21">21</option>
    <option value="19">19</option>
    <option value="001">001</option>
</select>

我的Java代码如下：

WebElement dropdownlist = driver.findElement(By.xpath("//select[@id='id12']"));
Select dropdown = new Select(dropdownlist);
dropdown.selectByVisibleText("100");

我也尝试了以下代码：

WebElement dropdownlist = driver.findElement(By.xpath("//select[@name='department']"));
Select dropdown = new Select(dropdownlist);
dropdown.selectByVisibleText("100");

WebElement dropdownlist = driver.findElement(By.cssSelector("select[id='id12']"));

<details>
<summary>英文:</summary>

I&#39;m trying to select an element from a dropdown list, but I got this error in the execution:

&gt; Exception in thread &quot;main&quot; org.openqa.selenium.NoSuchElementException:
&gt; no such element: Unable to locate element:
&gt; {&quot;method&quot;:&quot;xpath&quot;,&quot;selector&quot;:&quot;//select[@id=&#39;id12&#39;]&quot;}

The HTML code of the dropdown list is: 
```html
&lt;select style=&quot;width:163px&quot; name=&quot;department:department&quot; id=&quot;id12&quot;&gt;
    &lt;option selected=&quot;selected&quot; value=&quot;&quot;&gt;Escoge&lt;/option&gt;
    &lt;option value=&quot;100&quot;&gt;100&lt;/option&gt;
    &lt;option value=&quot;999&quot;&gt;999&lt;/option&gt;
    &lt;option value=&quot;800&quot;&gt;800&lt;/option&gt;
    &lt;option value=&quot;700&quot;&gt;700&lt;/option&gt;
    &lt;option value=&quot;600&quot;&gt;600&lt;/option&gt;
    &lt;option value=&quot;540&quot;&gt;540&lt;/option&gt;
    &lt;option value=&quot;500&quot;&gt;500&lt;/option&gt;
    &lt;option value=&quot;400&quot;&gt;400&lt;/option&gt;
    &lt;option value=&quot;345&quot;&gt;345&lt;/option&gt;
    &lt;option value=&quot;280&quot;&gt;280&lt;/option&gt;
    &lt;option value=&quot;270&quot;&gt;270&lt;/option&gt;
    &lt;option value=&quot;264&quot;&gt;264&lt;/option&gt;
    &lt;option value=&quot;262&quot;&gt;262&lt;/option&gt;
    &lt;option value=&quot;251&quot;&gt;251&lt;/option&gt;
    &lt;option value=&quot;201&quot;&gt;201&lt;/option&gt;
    &lt;option value=&quot;82&quot;&gt;82&lt;/option&gt;
    &lt;option value=&quot;81&quot;&gt;81&lt;/option&gt;
    &lt;option value=&quot;50&quot;&gt;50&lt;/option&gt;
    &lt;option value=&quot;21&quot;&gt;21&lt;/option&gt;
    &lt;option value=&quot;19&quot;&gt;19&lt;/option&gt;
    &lt;option value=&quot;001&quot;&gt;001&lt;/option&gt;
&lt;/select&gt;

My java code is:

WebElement dropdownlist = driver.findElement(By.xpath("//select[@id='id12']"));
Select dropdown = new Select(dropdownlist);
dropdown.selectByVisibleText("100");

I've tried with this too:

WebElement dropdownlist = driver.findElement(By.xpath("//select[@name='department']"));
Select dropdown = new Select(dropdownlist);
dropdown.selectByVisibleText("100");

WebElement dropdownlist = driver.findElement(By.cssSelector("select[id='id12']"));

答案1

得分: 0

可能这里 id 是动态的，你提供的 name 属性值是错误的。

尝试以下代码。

WebElement dropdownlist = driver.findElement(By.xpath("//select[@name='department:department']"));
Select dropdown = new Select(dropdownlist);
dropdown.selectByVisibleText("100");

注意：上述代码中的定位字符串是根据原始内容翻译的，实际使用时请根据实际情况进行确认。

WebElement dropdownlist = driver.findElement(By.xpath("//select[@name='department:department']"));
Select dropdown = new Select(dropdownlist);
dropdown.selectByVisibleText("100");

答案2

得分: 0

要处理下拉框，你需要使用org.openqa.selenium.support.ui.Select导入，并将下拉框实例化为WebDriver中的"Select"对象。同时，可能是因为您尝试执行操作的元素需要时间，因此出现了异常。添加显式等待并从您的端口检查::

WebElement element = driver.findElement(By.id("id12"));
WebDriverWait wait = new WebDriverWait(driver, 30);
wait.until(ExpectedConditions.visibilityOfElementLocated(element));
Select dropdown = new Select(element);
dropdown.selectByVisibleText("100");

WebElement element=driver.findElement(By.id("id12"));
WebDriverWait wait = new WebDriverWait(driver,30);
wait.until(ExpectedConditions.visibilityOfElementLocated(element));
Select dropdown = new Select(element);
dropdown.selectByVisibleText("100");