selenium python return data from javascript window object

Question

How can I get hold of the following object in python selenium:

(in firefox/Chrome console):
>>window.Alarms.alarmData
Array [ {…}, {…} ]

This returns empty:

alarm = driver.execute_script("return window.Alarms.alarmData;")
print(alarm)
[]

Alarms: {alarmData: Array(2), ruledefaults: {…}, rules: {…}, location: "", suppress_sound: 0, …} — MortenB
– MortenB, Commented Jan 14, 2019 at 15:55

Andersson · Accepted Answer · 2019-01-14 15:48:38Z

3

You can try to wait until JS object returns any non-empty value:

from selenium.webdriver.support.ui import WebDriverWait

alarm = WebDriverWait(driver, 20).until(lambda driver: driver.execute_script("return window.Alarms.alarmData;"))

answered Jan 14, 2019 at 15:48

Andersson

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4 Comments

MortenB Over a year ago

Thanks, Waiting helps, If I do return windows.Alarms; I get a large dict:

{'alarmData': [], 'augmentSingleAlarm': {}, 'bIgnoreError': 0, 'bLog': 0, 'bPrefServer': 0, 'bSkipHtml': 0, 'bSkipOutputUser': 0, ..

but alarmData is Empty. Even though I see it in console.

Andersson Over a year ago

@MortenB So return window.Alarms.alarmData; still returns you unexpected output or lead to TimeOutException?

MortenB Over a year ago

it returns an empty list, I found that if I add a mandatory time.sleep(10) it works, I should add a driverWait until list is no longer empty.

Andersson Over a year ago

@MortenB , I guess Python interpreter doesn't "recognize" JS empty list as Python empty list (check whether print(type(alarm)) returns list or str)... Yes try until(lambda driver: driver.execute_script("return window.Alarms.alarmData;") != "[]")

MortenB · Accepted Answer · 2019-01-15 08:38:59Z

With the help of @Andersson I found this issue. When starting window.Alarms.AlarmData is defined as an empty list '[]', so it will be successfully returned, I just need to wait until it is no longer an empty list, The important lession was to check initial state of variables, because they may be defined and just successfully in selenium.

def test2_alarmdata(self):
    """ fetch the data objects """
    driver = self.driver
    cookie_read(driver)
    driver.get(default['url'] + "/alarm_board/index.html")
    alarmData = None
    retries = args.retries
    while not alarmData and retries:
        time.sleep(1)
        alarms = driver.execute_script("return window.Alarms.alarmData;")
        if alarms:
            alarmData = alarms
        retries -= 1
    if isinstance(alarmData, list):
        print("we have {} queued alarms".format(len(alarmData)))

Run the unittest:

we have 2 queued alarms
__main__.T.test2_alarmdata (3.4068s)

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