Question

我正在尝试使用python中的Selenium Web驱动程序自动化网站。当由于服务器错误导致页面无法正确加载而无法获得clickable元素时，它将卡住。我想创建一个函数，如果未正确加载页面（更具体地说，如果未获得clickable元素），它将在15秒后自动刷新页面。

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

driver=webdriver.Chrome(r"C:\Users\Hp\Downloads\chromedriver")

driver.get("https://addguru.in/user/index.php")
driver.maximize_window()

driver.implicitly_wait(15)

username=driver.find_element_by_name("username").send_keys("-------")

password=driver.find_element_by_name("password").send_keys("-------")

driver.implicitly_wait(40)

driver.find_element_by_class_name("submit_btn").click()
""" I want a function here which automatically refresh the page after each 15 sec if  the submit-btn is not clickable (due to propely loading problem) """
browser.find_element_by_id("checkCbtaskdiv").click()


driver.implicitly_wait(10)

Answer 1

快速查看一下，根据this answer，您可以将driver.find_element_by_class_name("submit_btn")的响应（不带.click()的变量）设置为变量，然后检查该变量是否不是None

while elements is None:
    elements = driver.find_element_by_class_name("submit_btn")

for e in elements:
    e.click()

Answer 2

在发生断言时，至少应在声明中发布警告。这样，您就知道发生了什么错误。如果这样做，以下内容将为您提供帮助...

在页面初始化或开始加载有问题的页面时添加此内容。您也可以在任何页面上执行此操作。

driver.execute_script('''

    window.errorCount = 0;
    window.onerror = function (error, url, line, column, errorMessage) {

        errorCount ++;
        //** Add whatever you like from the error information to this json string.
        errorJson = '{"code":"' + error.Status + '", "error":"' + error.Status + '", "details":"' + errorMessage + '"}';
        //Appending hidden input with details to document. All console errors can be scraped this way, or just ones that stop page load if you like.
        $("body").append("<input type='hidden' class='console-error-saved' id='" + errorCount 
     + '"' value='" + errorJson + "'");

    }
''')

然后，在您的Selenium脚本中，等待出现预期的元素时，如果等待超时并且仍然找不到该元素，请运行以下命令：

pageErrors = driver.execute_script('''
    var json = ""; 
    var errors = $('.console-error-saved'); 
    for(var x=0; x < errors.length; x++) { 

        json += $(errors[x]).text(); 
        if(x < errors.length - 1) { 
            json += ","; 
        } 

    } 
    return "[" + json + "]";
''')

现在从Python解析json以从字符串中获取对象。查找特定错误，例如502、503等，并报告它们，然后调用刷新命令

import json
errors = json.loads(pageErrors)
#... look at the errors and handle them as needed.
# If qualifying error occurred, refresh the page and do your checks again.
driver.refresh()

Answer 3

欢迎您。这是方法。

# interval - refresh time
# maxTime - maximum time to wait (rather going into infinite loop)
def refresh_browser_until_element_present(locator_type, locator, interval, maxTime):
    startTime = datetime.now()
    elements = []
    while ((datetime.now() - startTime).seconds<maxTime and len(elements) ==0):
        time.sleep(interval)
        driver.refresh()
        if locator_type == 'xpath':
            elements = driver.find_elements_by_xpath(locator)
        elif locator_type == 'css':
            elements = driver.find_elements_by_css_selector(locator)

如何使用该方法：

refresh_browser_until_element_present('css','#checkCbtaskdiv',15,120)

如何刷新页面直到正确加载页面（由于服务器错误，如错误502）

3 个答案: