硒Webdriver没有这样的元素：无法找到元素

Question

我是新的Python的硒webdriver学生。

我想单击（）下一个按钮，但它不起作用。

我在这里呆了几天。

谢谢你的帮助。

消息错误：

Message: no such element: Unable to locate element: {"method":"xpath","selector":"//*[@id='next_button']"} 

这是我的代码：

browser.find_element_by_xpath("//*[@id='next_button']").click() 

这是网页源：

<div id=“banner" class="shell" style="width: 786px; background-color: rgb(0, 0, 255);"> 
<input id=“json" value=“x" type="hidden"> 
    <div class="shell"> 
     <div class="border"> 
      <div id="header" style="height: 135px;"> 
      <div id="navigation"> 
      <div id="main" style="background-color:#FFFFFF;"> 
       <div id="content" class="left" style="padding: 30px 0px 20px; left: 250px;"> 
        <style> 
        <div style="width: 100%;"> 
         <div class="inPn" style="width: 100%;background: #ffffff"> 
          <div class="detail"> 
           <h3>Example Event</h3> 
           <table class="fit"> 
            <colgroup> 
            <tbody> 
             <tr valign="middle"> 
              <td> 
              <td> 
               <div style="float:right; padding:5px;"> 
                <img id=“back_button" src="https://www.site/back.png" style="cursor: pointer;"> 
                <img id=“next_button" src="https://www.site/next.png" style="cursor: pointer;margin-top: 10px;" 

Answer 1

当你的元素需要从src获得图像，您可能需要等待一段时间，直到出现页面上的目标元素：

from selenium.webdriver.common.by import By 
from selenium.webdriver.support import expected_conditions as EC 
from selenium.webdriver.support.ui import WebDriverWait as wait 

button = wait(browser, 10).until(EC.presence_of_element_located((By.XPATH,"//img[@id='next_button']"))) 
button.click() 

Answer 2

我也建议等待页面使用下面的代码加载：

from selenium import webdriver 
from selenium.webdriver.common.by import By 
from selenium.webdriver.support.ui import WebDriverWait 
from selenium.webdriver.support import expected_conditions as EC 
from selenium.common.exceptions import TimeoutException 

try: 
    element = WebDriverWait(browser, 15).until(EC.presence_of_element_located((By.XPATH, "//img[@id='next_button']"))) 
    browser.find_element_by_xpath("//img[@id='next_button']").click()  
except TimeoutException: 
    print 'Timeout - No tag found' 
    continue 

或使用：

WebDriverWait(browser, 15).until(lambda driver: driver.find_elements(By.XPATH,"//img[@id='next_button']"))