How to Wait for Multiple Elements to Load Using Selenium in Python?

How to Wait for Multiple Elements to Load Using Selenium in Python

When working with dynamic web elements that load asynchronously via AJAX, it becomes essential to ensure that the elements are fully loaded before performing any actions on them. This article provides several methods to wait for multiple elements to load using Selenium in Python.

Using WebDriverWait with Custom Condition

One approach involves creating a custom waiting condition using the WebDriverWait class. In this condition, you check if the number of elements matching a specific selector exceeds a specified threshold. For example:

<code class="python">from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By

def wait_for_multiple_elements(driver, selector, min_count):
    """
    Wait for a minimum number of elements to load.
    Args:
        driver (WebDriver): Selenium WebDriver instance.
        selector (str): CSS selector for the elements.
        min_count (int): Minimum number of elements to wait for.
    """
    def custom_condition(d):
        elements = d.find_elements(By.CSS_SELECTOR, selector)
        return len(elements) >= min_count

    return WebDriverWait(driver, 30).until(custom_condition)</code>

Using WebDriverWait with Visibility_of_All_Elements_Located

This approach uses the built-in visibility_of_all_elements_located() expected condition to wait until all elements matching a specified locator are visible. For example:

<code class="python">from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By

elements = WebDriverWait(driver, 20).until(
    EC.visibility_of_all_elements_located((By.CSS_SELECTOR, "ul.ltr li[id^='t_b_'] > a[id^='t_a_'][href]"))
)</code>

Using Lambda Function

If you need to wait for a specific number of elements to load, you can use a lambda function with WebDriverWait. For instance, to wait for 10 elements:

<code class="python">WebDriverWait(driver, 20).until(
    lambda driver: len(driver.find_elements_by_xpath("//ul[@class='ltr']//li[starts-with(@id, 't_b_')]/a[starts-with(@id, 't_a_') and starts-with(., 'Category')]")) == 10
)</code>

Waiting for Child Elements

To wait for child elements of a specific parent element, you can use the .find_element_by_... method on the parent element and then apply the above waiting techniques to the child element.

References

• [Selenium Python documentation](https://selenium-python.readthedocs.io/waits.html)
• [How to Wait for a Specific Number of Elements to Load Using Selenium and Python](https://stackoverflow.com/questions/58851190/how-to-wait-for-number-of-elements-to-be-loaded-using-selenium-and-python)

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