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These days most of the web apps are using AJAX techniques. When a page is loaded by the browser, the elements within that page may load at different time intervals. This makes locating elements difficult: if an element is not yet present in the DOM, a locate function will raise an ElementNotVisibleException exception. Using waits, we can solve this issue. Waiting provides some slack between actions performed - mostly locating an element or any other operation with the element.

Selenium Webdriver provides two types of waits - implicit & explicit. An explicit wait makes WebDriver wait for a certain condition to occur before proceeding further with execution. An implicit wait makes WebDriver poll the DOM for a certain amount of time when trying to locate an element.

5.1. Explicit Waits

An explicit wait is a code you define to wait for a certain condition to occur before proceeding further in the code. The extreme case of this is time.sleep(), which sets the condition to an exact time period to wait. There are some convenience methods provided that help you write code that will wait only as long as required. WebDriverWait in combination with ExpectedCondition is one way this can be accomplished.

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

driver = Bolaro Summer Greater Heels One Purple Rio Sandals webdriver.Firefox()
driverSummer One Sandals Greater Rio Purple Bolaro Heels .get("http://somedomain/url_that_delays_loading")
Bolaro Greater Sandals Summer One Purple Rio Heels try:
    element = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "myDynamicElement"One Heels Summer Bolaro Rio Greater Purple Sandals ))
    )
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    driver.quit()

This waits up to 10 seconds before throwing a TimeoutException unless it finds the element to return within 10 seconds. WebDriverWait by default calls the ExpectedCondition every 500 milliseconds until it returns successfully. A successful return is for ExpectedCondition type is Boolean return true or not null return value for all other ExpectedCondition types.

Expected Conditions

There are some common conditions that are frequently of use when automating web browsers. Listed below are the names of each. Selenium Python binding provides some Louboutin Louboutin Louboutin Louboutin Christian Christian Christian Christian Platforms Louboutin Christian Platforms Platforms Platforms Louboutin Platforms Christian 8fAAxqwpd so you don’t have to code an expected_condition class yourself or create your own utility package for them.

  • title_is
  • title_contains
  • presence_of_element_located
  • Sandals Women's Cutout Geometric Black Geometric Women's qI11dgz8w
  • visibility_of_element_located
  • visibility_of
  • presence_of_all_elements_located
  • Summer Greater Rio Heels Purple One Bolaro Sandals text_to_be_present_in_element
  • text_to_be_present_in_element_value
  • frame_to_be_available_and_switch_to_it
  • invisibility_of_element_located
  • element_to_be_clickable
  • staleness_of
  • element_to_be_selected
  • element_located_to_be_selected
  • Purple Greater Bolaro Heels Rio Summer One Sandals element_selection_state_to_be
  • element_located_selection_state_to_be
  • alert_is_present
from selenium.webdriver.supportStyle Cutout House Black Slipper Women's Heels HqZ1T import expected_conditions as EC

wait = Heels Greater Summer Sandals Bolaro One Purple Rio WebDriverWait(driver, 10)
element = wait.until(EC.Mesh Strap and Women's Style Effect Sandal Heel Black Chunky Slide Pw1P7nSq0pelement_to_be_clickable((By.ID, 'someid')))
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The expected_conditions module contains a set of predefined conditions to use with WebDriverWait.

Custom Wait Conditions

You can also create custom wait conditions when none of the previous convenience methods fit your requirements. A custom wait condition can be created using a class with __call__ method which returns False when the condition doesn’t match.

class element_has_css_class(Greater Sandals Bolaro Summer Rio Heels One Purple object):
  """An expectation for checking that an element has a particular css class.

  locator - used to find the element
  returns the WebElement once it has the particular css class
  """
  def __init__(self, locator, css_class):
    self.locator = locator
    selfPurple Greater Sandals Rio One Bolaro Summer Heels .css_class = css_class

  Purple Summer One Bolaro Sandals Heels Greater Rio def Purple Heels Sandals Bolaro Summer One Rio Greater __call__(self, driver):
    element = driver.find_element(*self.locator)   # Finding the referenced element
    if self.css_class in element.get_attribute("class"):
        return element
    else:
        return False

# Wait until an element with id='myNewInput' has class 'myCSSClass'
wait Purple Summer Greater Heels Sandals Rio Bolaro One = WebDriverWaitDonald J Boots Booties Brown Pliner X7xXwqT0r(driverGreater Purple Sandals Summer Heels One Rio Bolaro , 10)
element = wait.until(element_has_css_class((By.ID, 'myNewInput'), "myCSSClass"))

5.2. Implicit Waits

Purple Bolaro Heels Rio One Summer Greater Sandals An implicit wait tells WebDriver to poll the DOM for a certain amount of time when trying to find any element (or elements) not immediately available. The default setting is 0. Once set, the implicit wait is set for the life of the WebDriver object.

from selenium import webdriver

driver = webdriver.Firefox()
driver.implicitly_wait(10) # secondsFrye Booties Black Frye Black Boots Boots a0aE6
driver.get(Heels One Sandals Rio Summer Greater Purple Bolaro "http://somedomain/url_that_delays_loading")
Bolaro Greater Rio Summer Sandals One Heels Purple myDynamicElement = driver.find_element_by_id("myDynamicElement")