expected_conditions
expected_conditions是selenium的一个模块，其中包含一系列可用于判断的条件：
selenium.webdriver.support.expected_conditions
17种判断方法:
from selenium.webdriver.support.wait import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
# 判断title,返回布尔值
WebDriverWait(driver,10).until(EC.title_is("百度一下，你就知道"))
# 判断title，返回布尔值
WebDriverWait(driver,10).until(EC.title_contains(u"百度一下"))
# 判断某个元素是否被加到了dom树里，并不代表该元素一定可见，如果定位到就返回WebElement
WebDriverWait(driver,10).until(EC.presence_of_element_located((By.ID,'kw')))
# 判断某个元素是否被添加到了dom里并且可见，可见代表元素可显示且宽和高都大于0
WebDriverWait(driver,10).until(EC.visibility_of_element_located((By.ID,'su')))
# 判断元素是否可见，如果可见就返回这个元素
WebDriverWait(driver,10).until(EC.visibility_of(driver.find_element(by=By.ID,value='kw')))
# 判断是否至少有1个元素存在于dom树中，如果定位到就返回列表
WebDriverWait(driver,10).until(EC.presence_of_all_elements_located((By.CSS_SELECTOR,'.mnav')))
# 判断是否至少有一个元素在页面中可见，如果定位到就返回列表
WebDriverWait(driver,10).until(EC.visibility_of_any_elements_located((By.CSS_SELECTOR,'.mnav')))
# 判断指定的元素中是否包含了预期的字符串，返回布尔值
WebDriverWait(driver,10).until(EC.text_to_be_present_in_element((By.XPATH,"//*[@id='u1']/a[8]"),u'设置'))
# 判断指定元素的属性值中是否包含了预期的字符串，返回布尔值
WebDriverWait(driver,10).until(EC.text_to_be_present_in_element_value((By.CSS_SELECTOR,'#su'),u'百度一下'))
# 判断该frame是否可以switch进去，如果可以的话，返回True并且switch进去，否则返回False
WebDriverWait(driver,10).until(EC.frame_to_be_available_and_switch_to_it(locator))
#注意#这里并没有一个frame可以切换进去
# 判断某个元素在是否存在于dom或不可见,如果可见返回False,不可见返回这个元素
WebDriverWait(driver,10).until(EC.invisibility_of_element_located((By.CSS_SELECTOR,'#swfEveryCookieWrap')))
#注意#swfEveryCookieWrap在此页面中是一个隐藏的元素
# 判断某个元素中是否可见并且是enable的，代表可点击
WebDriverWait(driver,10).until(EC.element_to_be_clickable((By.XPATH,"//*[@id='u1']/a[8]"))).click()
# 等待某个元素从dom树中移除
WebDriverWait(driver,10).until(EC.staleness_of(driver.find_element(By.ID,'su')))
# '判断某个元素是否被选中了,一般用在下拉列表
WebDriverWait(driver,10).until(EC.element_to_be_selected(driver.find_element(By.XPATH,"//*[@id='nr']/option[1]")))
# 判断某个元素的选中状态是否符合预期
WebDriverWait(driver,10).until(EC.element_selection_state_to_be(driver.find_element(By.XPATH,"//*[@id='nr']/option[1]"),True))
# 判断某个元素的选中状态是否符合预期
WebDriverWait(driver,10).until(EC.element_located_selection_state_to_be((By.XPATH,"//*[@id='nr']/option[1]"),True))
self.driver.find_element_by_xpath(".//*[@id='gxszButton']/a[1]").click()
# 判断页面上是否存在alert,如果有就切换到alert并返回alert的内容
instance = WebDriverWait(driver,10).until(EC.alert_is_present())
print(instance.text)
instance.accept()
实例Code:
Python:
from selenium import webdriver
from time import sleep
import os
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.support.wait import WebDriverWait
class TestCase(object):
def __init__(self):
self.driver = webdriver.Chrome()
# file协议拼接+绝对路径
path = 'file:///' + os.path.abspath('test_wait.html')
# 访问本地html
self.driver.get(path)
def test(self):
# 点击按钮
self.driver.find_element_by_id('btn').click()
# 显示等待
wait = WebDriverWait(self.driver, 3)
# 等到id2中的文本Hello出现时
wait.until(EC.text_to_be_present_in_element((By.ID, 'id2'), 'Hello'))
# 打印id2的value
print(self.driver.find_element_by_id('id2').text)
self.driver.quit()
print('Pass')
if __name__ == '__main__':
case = TestCase()
case.test()
HTML
<html>
<head>
<title>Title</title>
</head>
<body>
<script>
<!--调用Timeout: 两秒后执行populate()方法-->
function f() {
window.setTimeout("populate()",2000);
}
<!--拿到form表单里的t1,把t1里的value变成populated，把id1里的内容变成id2的Hello-->
function populate() {
document.f1.t1.value = "populated";
document.getElementById("id1").innerHTML = "<div id='id2'>Hello</div>"
}
</script>
<form name="f1">
<input type="text" name="t1">
<input type="button" value="Click me" onclick="f()" id="btn">
<div id="id1"></div>
</form>
</body>
</html>
