How to identify if Angular toggle-switch toggle is clicked?

Question

I am trying to define if Angular's toggle-switch is clicked or not using Selenium and Python tools. When open a new form my input id has class ng-untouched ng-pristine ng-valid.

After clicked, it changes to ng-valid ng-dirty ng-touched. But after a third click nothing changes. After I click it and save the form, the class stays always ng-valid ng-dirty ng-touched and remains the same after any change (even after disabling toggle and saving). This is not a bug because changes are saved on server side.

Which CSS property should I look at to define what is changed? Here is html code sample:

<div _ngcontent-c26="" class="form-group">
    <label _ngcontent-c26="" for="checked">Checked</label>
    <div _ngcontent-c26="" class="toggle-switch">
        <input _ngcontent-c26="" id="opened" name="checked" type="checkbox" class="ng-valid ng-dirty ng-touched">
            <label _ngcontent-c26="" for="checked"></label>
        </div>
        <span _ngcontent-c26="" class="form-control-helper"></span>
    </div>

score 1 · Answer 1 · answered Feb 02 '21 at 20:08

Form State and Input State

AngularJS constantly updates the state of both the <form> and the <input> fields.

Input fields have the following states:

$untouched: The field has not been touched yet
$touched: The field has been touched
$pristine: The field has not been modified yet
$dirty: The field has been modified
$invalid: The field content is not valid
$valid: The field content is valid

These are the properties of the <input> field, and are either true or false.

Forms also have the following states:

$pristine: No fields have been modified yet
$dirty: One or more have been modified
$invalid: The form content is not valid
$valid: The form content is valid
$submitted: The form is submitted

This usecase

To validate the Angular toggle-switch state using Selenium and python you have to induce WebDriverWait for visibility_of_element_located and you can use either of the following Locator Strategies:

Probing ng-touched:

try:
    WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//input[@id='opened' and @name='checked'][contains(@class, 'ng-touched')]")))
    print("Toggle Switch has been touched")
except TimeoutException:
    print("Toggle Switch has not been touched")

Probing ng-dirty:

try:
    WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.XPATH, "//input[@id='opened' and @name='checked'][contains(@class, 'ng-dirty')]")))
    print("Toggle Switch has been touched")
except TimeoutException:
    print("Toggle Switch has not been touched")

Note : You have to add the following imports :

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

Thanks for such a detailed answer. I will try these options tomorrow. — vitaliis, Feb 02 '21 at 20:23
Thanks, I tried your suggestions and while researching found a few more good solutions. — vitaliis, Feb 03 '21 at 21:50

vitaliis · Accepted Answer · 2022-10-12T04:22:27.113

After trying a few options and more research I found two solutions to test is a toggle/checkbox is checked. First, by using .is_selected() Selenium's method:

driver.find_element_by_css_selector("input[type=checkbox]").is_selected()

It returns True if a toggle is ON and False if it is OFF.

Second, I looked closely and CSS settings and found out that when a toggle is ON, :checked is added to it. So, you can use a boolean expression for this locator. In Chrome's DevTools this attribute can be found in Properties tab, the name is checked. More details are here:

The locator for checked toggle will look like:

input[type=checkbox]:checked

For unchecked:

input[type=checkbox]

Also, there is a third option which will work for many cases. For example, if a toggle changes its color, its property is also changed. So you can use:

driver.find_element_by_css_selector("input[type=checkbox]").value_of_css_property("background-color") == "some color"

For example, place "#fff" (white) if you expect this CSS property to be white.

How to identify if Angular toggle-switch toggle is clicked?

2 Answers2

Form State and Input State

This usecase