这是我第一次使用Selenium Web驱动程序（带有Python），并且我试图转到搜索框，在其中输入内容，然后点击Submit。
相关的HTML如下所示：
<iframe id="mainFrame" class="" width="100%" height="" frameborder="0" title="Main content frame" onload="initFrame();" scrolling
....
<tr>
<td style="vertical-align:middle;">
<input id="terms" type="text" onblur="RevertText(this,'Enter Search Terms');" onfocus="AllowType(this,'Enter Search Terms')" value="Enter Search Terms" style="color: rgb(164, 164, 164);"></input>
</td>
<td style="vertical-align:middle;">
<input id="srchButt" class="buttAcdmicOne" type="submit" value="Search"></input>
</td>
</tr>
我的代码如下所示：
driver.switch_to.frame("mainFrame")
elem = driver.find_element_by_id("terms")
elem.send_keys("Test")
但这是行不通的，我也不知道为什么它不...（可能会有多个带有条件ID的东西？）
编辑：
我收到的错误是：
selenium.common.exceptions.NoSuchElementException: Message: Unable to locate element: {"method":"id","selector":"terms"}
我收到的新错误是：
selenium.common.exceptions.NoSuchFrameException: Message: no such frame: element is not a frame
<!DOCTYPE html>
<html xmlns="_http://www.w3.org/1999/xhtml" webdriver="true">
<head></head>
<body onload="init();" style="overflow:auto;">
<div id="overlay" class="" style="height: 0px;"></div>
<!--
For Modal Popup
-->
<div style="width:938px;margin-left:30px;"></div>
<input id="toolBarStatus" type="hidden" value="expanded" name="toolBarStatus"></input>
<input id="hotTopictarget" type="hidden" value="" name="hotTopictarget"></input>
<input id="idxTms" type="hidden" name="idxTms" value=""></input>
<input id="srchWidgFrm" type="hidden" name="srchWidgFrm"></input>
<input id="isUseRelChkd" type="hidden" name="isUseRelChkd"></input>
<input id="actionTkn" type="hidden" name="actionTkn"></input>
<input id="advSrcs" type="hidden" value="" name="advSrcs"></input>
<input id="advSrcNms" type="hidden" value="" name="advSrcNms"></input>
<input id="prevSearchTerms" type="hidden" name="prevSearchTerms"></input>
<input id="segListAll" type="hidden" value="" name="segListAll"></input>
<input id="isLoaded" type="hidden" name="isLoaded"></input>
<input id="defaultSrcs" type="hidden" value="270077,11059,8411,270944" name="defaultSrcs"></input>
<input id="prevSrcsChkd" type="hidden" name="prevSrcsChkd"></input>
<input id="srcsChkd" type="hidden" value="270077,11059,8411,270944" name="srcsChkd"></input>
<input id="noSrcs" type="hidden" value="" name="noSrcs"></input>
<input id="prevDates" type="hidden" value="" name="prevDates"></input>
<input id="prevSegs" type="hidden" value="" name="prevSegs"></input>
<div align="left" style="width:98%;height:25px;"></div>
<iframe id="mainFrame" class="" width="100%" height="" frameborder="0" title="Main content frame" onload="initFrame();" scrolling="no" src="form_main_search.asp" style="height: 721px;" name="mainFrame">
#document
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" webdriver="true">
<head></head>
<body onunload="cleanUp();" onload="init();initAdvance();parent.resizeIframe();" style="height:98%;">
<table style="width:100%;height:auto;">
<tbody>
<tr>
<td style="width: 170px;height:100%;"></td>
<td>
<!--
Main Search Starts
-->
<div align="left" style="width:668px;height:100%;">
<!--
General Search Starts
-->
<div id="generalSearch" align="left" style="width:662px;">
<form id="searchForm" autocomplete="off" onsubmit="validateSearch(this);return false;" action="" method="get" name="searchForm">
<table style="width:100%;height:100%;">
<tbody>
<tr></tr>
<tr>
<td style="width:662px;height:51px;" colspan="3">
<div id="searchDiv_2">
<table align="center" style="width:646px;height:100%;">
<tbody>
<tr>
<td style="vertical-align:middle;">
<input id="terms" type="text" onblur="RevertText(this,'Enter Search Terms');" onfocus="AllowType(this,'Enter Search Terms')" value="Enter Search Terms" style="color: rgb(164, 164, 164);"></input>
</td>
<td style="vertical-align:middle;">
<input id="srchButt" class="buttAcdmicOne" type="submit" value="Search"></input>
</td>
</tr>
</tbody>
</table>
</div>
</td>
</tr>
<tr></tr>
</tbody>
</table>
</form>
</div>
<!--
General Search Ends
-->
<!--
Message Box Starts
-->
<div id="bannerMessageSpace" style="height: 10px;"></div>
<div id="bannerMessageCont" style="padding-left: 2px;"></div>
<!--
Message Box Ends
-->
<!--
Hottopics links Starts
-->
<div id="hotTopics" class="" style="display:block;padding-top:14px;width:662px;height:150px;padding-left:2px;"></div>
<!--
Hottopics links Ends
-->
<!--
SearchWidgets Starts
-->
<div id="SearchWidgets" style="display:block;padding-top:16px;width:100%;height:325px"></div>
<!--
SearchWidgets Ends
-->
</div>
<!--
Main Search Ends
-->
</td>
</tr>
</tbody>
</table>
<!--
Footer Starts
-->
<div style="margin-bottom: 35px; padding-top: 20px; padding-left: 30px; width: 98%;"></div>
<!--
Footer Ends
-->
<!--
Advance Search Option Starts
-->
<div id="advanceDiv" style="display:none;background-color: White;border:1px solid #99999…;top:97px;left:184px;width:646px;height:auto;border-top:0px;"></div>
<!--
Advance Search Option Ends
-->
<!--
For Modal Popup Starts
-->
<div id="divBackground" class="ModalBackground"></div>
<!--
For Modal Popup Ends
-->
<!--
Search By Content Type Starts
-->
<div id="addnlSrchForm" style="display:none;overflow: hidden;position:absolute;top:34px;lef…width:570px;background-color:white;border:solid 1px #999999;"></div>
<!--
Search By Content Type Ends
-->
<div id="loading1" class="loading2"></div>
<div style="position: absolute; width: 210px; z-index: 10; display: none; background-color: White;"></div>
<script src="js/commonForm.js" type="text/javascript"></script>
<script src="js/AS.js" type="text/javascript"></script>
<script src="js/ASadv.js" type="text/javascript"></script>
<script src="js/suggestSource.js" type="text/javascript"></script>
<script type="text/javascript"></script>
<div id="ui-datepicker-div" class="ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all"></div>
</body>
</html>
</html>
</iframe>
<div id="one" class="connectors" style="display:none;"></div>
<script src="js/GAnalytics.js" type="text/javascript"></script>
<script type="text/javascript" src="http://app.ubertags.com/javascripts/ubertags.js"></script>
<div id="ui-datepicker-div" class="ui-datepicker ui-widget ui-widget-content ui-helper-clearfix ui-corner-all ui-helper-hidden-accessible"></div>
<script type="text/javascript"></script>
<!--
Google Code for Remarketing Tag - ECOMMERCE Accou…
-->
<!--
------------------------------------------------
R…
-->
<script type="text/javascript"></script>
<script src="//www.googleadservices.com/pagead/conversion.js" type="text/javascript"></script>
<iframe width="300" height="13" frameborder="0" scrolling="no" allowtransparency="true" hspace="0" vspace="0" marginheight="0" marginwidth="0" src="http://googleads.g.doubleclick.net/pagead/viewthroughconvers…&frm=0&url=http%3A//www.lexisnexis.com/hottopics/lnacademic/"
title="Google conversion frame" name="google_conversion_frame"></iframe>
<noscript></noscript>
<script type="text/javascript"></script>
<!--
Google Code for Remarketing Tag - LEAD GEN Accoun…
-->
<!--
------------------------------------------------
R…
-->
<script type="text/javascript"></script>
<script src="//www.googleadservices.com/pagead/conversion.js" type="text/javascript"></script>
<img width="1" border="0" height="1" src="http://googleads.g.doubleclick.net/pagead/viewthroughconvers…&frm=0&url=http%3A//www.lexisnexis.com/hottopics/lnacademic/" alt=""></img>
<noscript></noscript>
<script type="text/javascript"></script>
<!--
Google Code for Remarketing Tag
-->
<!--
------------------------------------------------
R…
-->
<script type="text/javascript"></script>
<script src="//www.googleadservices.com/pagead/conversion.js" type="text/javascript"></script>
<script type="text/javascript"></script>
<!--
Google Code for Remarketing Tag
-->
<!--
------------------------------------------------
R…
-->
<script type="text/javascript"></script>
<script src="//www.googleadservices.com/pagead/conversion.js" type="text/javascript"></script>
<script type="text/javascript"></script>
<script type="text/javascript" src="//platform.twitter.com/oct.js"></script>
<img width="1" border="0" height="1" src="http://googleads.g.doubleclick.net/pagead/viewthroughconvers…&frm=0&url=http%3A//www.lexisnexis.com/hottopics/lnacademic/" alt=""></img>
<noscript></noscript>
<noscript></noscript>
<script type="text/javascript"></script>
<script type="text/javascript"></script>
<script type="text/javascript"></script>
<noscript></noscript>
<script type="text/javascript"></script>
<noscript></noscript>
<script type="text/javascript"></script>
<script src="http://7205084.collect.igodigital.com/collect.js" type="text/javascript"></script>
<script src="http://www.bizographics.com/collect/?time=1438024251782&pid=…2Fwww.lexisnexis.com%2Fhottopics%2Flnacademic%2F&ref=&fmt=js" type="text/javascript"></script>
<script type="text/javascript"></script>
<div style="display: none;"></div>
<img width="1" border="0" height="1" src="https://imp2.bizographics.com/l" alt="" style="display: none;"></img>
</body>
</html>最佳答案
以下是获得NoSuchElementException的2个常见原因（包括解决方案）：
元素在iframe内部，您需要在搜索之前切换到它：
driver.switch_to.frame("my_frame_id_or_name")
elem = driver.find_element_by_id("terms")
elem.send_keys("Test")
执行搜索时，该元素尚不存在。 Wait for it：
from selenium.webdriver.common.by import By
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
wait = WebDriverWait(driver, 10)
terms = wait.until(EC.presence_of_element_located((By.ID, "terms")))
terms.send_keys("test")
或者，甚至两个解决方案也应结合使用：
wait = WebDriverWait(driver, 10)
iframe = wait.until(EC.presence_of_element_located((By.ID, "mainFrame")))
driver.switch_to.frame(iframe)
terms = wait.until(EC.visibility_of_element_located((By.ID, "terms")))
terms.send_keys("test")