以下代码可以在真正的浏览器中通过，但在无头 Chrome 中则不行。
while True:
try:
#Explicitly wait
print("Try4")
WebDriverWait(driver, 10).until(EC.presence_of_element_located((By.ID, "00BC0000008hfCI_listSelect")))
print("Try5")
##Locate the select box
s = driver.find_element_by_id("00BC0000008hfCI_listSelect")
##Unassigned queue
Select(s).select_by_value("00BC0000008hqG8")
time.sleep(1)
except TimeoutException :
print("Wrong!")
break
结果将是：
Try4
Wrong!
看来无头镀铬找不到该元素。它与 Chrome 浏览器配合良好。我的 Selenium 版本是 3.14.0。
HTML 将类似于：
<div class="topNav primaryPalette" id="00BC0000008hfCI_topNav"><div class="controls"><img src="/img/s.gif" alt="Case" class="pageTitleIcon" title="Case">
<select class="title" id="00BC0000008hfCI_listSelect" name="fcf" onchange="ListViewport.instances['00BC0000008hfCI'].showFeedOrListView(this.options[this.selectedIndex].value)" title="View:"><option value="00BC0000009AFei">All Open Casa Cases</option>
<option value="00B800000063tb2">All Open Cases</option>
<option value="00B1A000009ZCok">Channel Upgrade Cases CCLTD</option>
<option value="00B1A000009VKSg">Channel Upgrade Queue</option>
<option value="00BC00000099n8S">China team's cases</option>
<option value="00BC00000097nXg">Delete Queue</option>
<option …