These days most of the web apps are using AJAX techniques and angular. 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
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 Python 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.
Selenium Python tries to find the element without bothering about whether elements are loaded or not, and selenium python throws
Implicitly wait is one of the way to request selenium not throw any exception until provided time.
Default wait time of the selenium is 500 milli-seconds, implicitly wait overrides the default wait time of the selenium python.
If element is found before implicitly wait time, selenium moves to next commands in the program without waiting to complete the implicitly wait time, this wait is also called dynamic wait.
Implicit wait is set for the entire duration of your selenium driver and is set at the start of your program. Most of the automation tester writes the implicit wait after creation of browser object.
Implicit wait tries to find the element in first go, if element is not present implicit wait tries to find the element after 500ms of first polling, if element is not available on second time also then implicit wait tries third time after 500 ms of second try and it goes on till the time reaches the 30 seconds
What it does is, in case while executing, if your selenium python doesn't finds any element then instead of throwing an exception, implicit wait makes your driver to wait for the specified wait time and then try to find the element once again.
If the driver still does not finds the element then it throws exception. Implicit wait does the same for all the elements in your program, so you just have to set it once.
driver = webdriver.Chrome(executable_path=r'D:\PATH\chromedriver.exe'); driver.implicitly_wait(30)
The explicit wait is used to tell the Web Driver to wait for certain conditions or the maximum time limit before throwing an Exception .
We can reuse the WebdriverWait object once we create it.Explicit wait will be applicable for only one line, we have to use it with ExpectedConditions class.
ExplicitWait does not have any effect on findElement and findElements.ExplicitWait also called as WebdriverWait.
WebDriverWait by default calls the ExpectedCondition every 500 milliseconds until it returns successfully.
Syntax : wait=new WebDriverWait( driver, timeoutInSeconds);
Explicit waits are a good way to organize a test script and provide more flexibility, by allowing us to design out tests in a way, where we can wait for some predefined or custom conditions and then carry on with what we want.
Below code waits for the element to become clickable
driver = webdriver.Chrome(executable_path=r'D:\PATH\chromedriver.exe'); driver.get("https://chercher.tech/practice/explicit-wait-sample-selenium-webdriver"); wait = new WebDriverWait(driver, 30 /*timeout in seconds*/); wait.until(ExpectedConditions.element_to_be_clickable(By.xpath("//button[@id='btn1']"))));
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