陈旧元素引用异常

Question

因此，我试图找出一种方法来自动单击所选的选择元素选项，但是当我使用selenium站点提供的代码来导航选项时，我得到了stale element exception错误。我尝试使用等待时间来等待元素加载，但是无论我把等待时间放在哪里，它都会给我一个错误。它确实通过第一个选择并选择了一个选项，但对于第二个选项，它要么遍历每个选项并单击，然后给我一个错误，而不在屏幕上更新它，要么遍历一半并给出陈旧的元素错误。

这是我下面代码的一部分：

displayed = browser.find_elements_by_xpath("//select[@name='listing_variation_id']") #check to see if this element is an option
                    if displayed:
                        selections = browser.find_elements_by_xpath("//select[@name='listing_variation_id']")
                        print("\n" + str(len(selections)) + "\n")

                        for options in selections: #select and choose an item choice
                            all_options = options.find_elements_by_tag_name("option")
                            for option in all_options:
                                browser.implicitly_wait(2)
                                print("Value is: %s" % option.get_attribute("innerText")) #debugging
                                option.click()

这就是我正在尝试导航的html：

'''
<div id="variations" class="buy-box__variations ui-toolkit " data-buy-box-view-options="{&quot;user_is_listing_owner&quot;:false,&quot;order_already_started&quot;:false,&quot;inline_variation_labels&quot;:false,&quot;listing_mode&quot;:&quot;listing_mode_default&quot;,&quot;show_preview_warning&quot;:false,&quot;quantity_behavior&quot;:&quot;quantity_enabled&quot;,&quot;quantity_related_nudge_is_on&quot;:true,&quot;additional_button_class&quot;:&quot;&quot;,&quot;is_mobile&quot;:false,&quot;channel&quot;:1}">
    <div class="buy-box__variation item-variation-option">
    <label for="inventory-variation-select-0">How Many?</label>
    <span>
        <select id="inventory-variation-select-0" class="variation-select" name="listing_variation_id">
            <option value="" selected="">Select an option</option>
            <option value="44719679623">One Squeaker [$1.75]</option>
            <option value="44719679633">Two Squeakers [$2.50]</option>
        </select>
    </span>
    <div class="buy-box__variation-error p-xs-1 mt-xs-1 text-smaller bg-red text-white rounded display-none">Please select an option</div>
</div><div class="buy-box__variation item-variation-option">
    <label for="inventory-variation-select-1">Placement</label>
    <span>
        <select id="inventory-variation-select-1" class="variation-select" name="listing_variation_id">
            <option value="" selected="">Select an option</option>
            <option value="42697801382">Top of Tail</option>
            <option value="42697801396">Bottom of Tail</option>
            <option value="42697801398">For Two- Top&amp;Bottom</option>
            <option value="42697801406">For Two- Both Bottom</option>
            <option value="42697801408">For Two- Both Top</option>
        </select>
    </span>
    <div class="buy-box__variation-error p-xs-1 mt-xs-1 text-smaller bg-red text-white rounded display-none">Please select an option</div>
</div><div class="buy-box__variation item-variation-option">
    <label for="inventory-select-quantity">Quantity</label>
    <span>
        <select id="inventory-select-quantity" class="small" name="">
            <option value="1" selected="">1</option>
            <option value="2">2</option>
            <option value="3">3</option>
            <option value="4">4</option>
            <option value="5">5</option>
            <option value="6">6</option>
        </select>
    </span>
    <div class="buy-box__variation-error p-xs-1 mt-xs-1 text-smaller bg-red text-white rounded display-none">Please select a quantity</div>
</div>
</div>
'''

Answer 1

当所讨论的元素在dom上被改变并且对该元素的初始引用被驱动程序丢失时，就会发生StaleElementException。

您可以再次搜索该元素。下面的代码远未使用，如果您决定搜索过时的元素错误后的元素，您可能需要对其进行修改

 from selenium.webdriver.support.select import Select as WebDriverSelect
 options = WebDriverSelect(driver.find_elements_by_xpath("//select[@name='listing_variation_id']")).options

for i in range(len(options)):
   try:
      options[i].click()
   except StaleElementReferenceException:
       options = WebDriverSelect(driver.find_elements_by_xpath("//select[@name='listing_variation_id']")).options
        if not options.is_selected():
          options[i].click()

Answer 2

for(int i =0; i<2;i++) {

    try {
    WebElement se = driver.findElement(By.xpath("desired xpath"));
    js.executeScript("arguments[0].click()", se);
    break;
    }
    catch(StaleElementReferenceException e) {
    }
}

这肯定会起作用，而且很简单。