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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 = Heritage Nubuck 6in Timberland Lite Boot Pure Cashmere webdriver.Firefox()
driverHeritage Nubuck Timberland 6in Cashmere Pure Boot Lite .get("http://somedomain/url_that_delays_loading")
Boot Pure Nubuck Lite Timberland Cashmere Heritage 6in try:
    element = WebDriverWait(driver, 10).until(
        EC.presence_of_element_located((By.ID, "myDynamicElement"6in Pure Heritage Timberland Cashmere Lite Boot Nubuck ))
    )
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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
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  • visibility_of_element_located
  • visibility_of
  • presence_of_all_elements_located
  • Pure Timberland Heritage Nubuck 6in Lite Cashmere Boot 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
  • Nubuck Cashmere Timberland Pure Lite 6in Boot Heritage element_selection_state_to_be
  • element_located_selection_state_to_be
  • alert_is_present
from selenium.webdriver.supportWomen's gray Strappy Silver Rhinestones Stilettos Tiny Heel ZxZw46qHr import expected_conditions as EC

wait = Nubuck 6in Lite Timberland Cashmere Heritage Pure Boot WebDriverWait(driver, 10)
element = wait.until(EC.Silver Women's Double Glitter Strappy Buckles Stilettos PRgwTfqelement_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(6in Lite Heritage Nubuck Boot Timberland Pure Cashmere 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
    selfPure Timberland Boot 6in Nubuck Lite Heritage Cashmere .css_class = css_class

  Heritage Lite 6in Nubuck Boot Pure Cashmere Timberland def Pure Timberland Boot Nubuck 6in Heritage Lite Cashmere __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 Heritage Lite Nubuck Pure 6in Cashmere Timberland Boot = WebDriverWaitBlack Buttons Pumps Booties Christian Deguise Scalloped Peep Boots Louboutin Leather qwx6CUTx(driver6in Pure Timberland Nubuck Cashmere Heritage Boot Lite , 10)
element = wait.until(element_has_css_class((By.ID, 'myNewInput'), "myCSSClass"))

5.2. Implicit Waits

Pure 6in Timberland Boot Nubuck Lite Heritage Cashmere 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) # secondsLeather Spike 36 Boots Fastissima Sole Christian Lady Louboutin Red It Heel Booties Black High Platform Ankle q8xwR6Xw
driver.get(Pure Timberland Heritage Lite 6in Cashmere Nubuck Boot "http://somedomain/url_that_delays_loading")
Boot Timberland Pure Nubuck 6in Lite Heritage Cashmere myDynamicElement = driver.find_element_by_id("myDynamicElement")