What is the reason behind the varied behavior of these two element locator calls?

Currently, I am developing a JavaScript-based webdriver automation to test a web application. Below is a snippet of the code I have written:

var selenium = require('selenium-webdriver');
By = selenium.By;
until = selenium.until;

driver = new selenium.Builder().
  withCapabilities(selenium.Capabilities.chrome()).
  build();

getItems = async function() {
  try {
    var itemsXpath = '[xpath expression]';
    var items = await driver.findElements(By.xpath(itemsXpath));
    log(items.length + ' items found');
    ...
  }
  catch(err) {
    log(err);
  }
}

The initial code runs successfully. However, when I substitute the await line with:

var items = await driver.wait(until.elementsLocated(By.xpath(itemsXpath)),60000);

it does not behave as expected. Neither the subsequent log() nor the one in the catch() block are displayed.

After reviewing the documentation, it was my understanding that if there were items on the webpage that match the XPath locator, either approach would work and return the elements. However, for nonexistent elements, the second method should wait for them to be visible (up to 60000 ms).

It's worth noting that even if the items are present on the screen at the time getItems() is invoked, the alternative implementation fails. Additionally, the execution finishes before the timeout specified in driver.wait().

Is there a misunderstanding on my part regarding this functionality? If so, could someone provide clarity on what might be occurring in this scenario?

Answer №1

Your current code snippet is as follows:

var items = await driver.findElements(By.xpath(itemsXpath));

This code will search for the element and return an Array<WebElement> if any element(s) match the given xpath.

However, the waiting methods you have used are different:

var items = await driver.wait(until.elementsLocated(By.xpath(itemsXpath)),60000);

These lines do not return any elements immediately. Instead, they wait until the specified element is found in the DOM.

You have set a 60-second timeout to find the element using the elementLocated method. This line will wait for a maximum of 60 seconds to find an element that matches your xpath. If an element matching the xpath is found in less than 60 seconds, the wait will end at that time and proceed to the next line of code. It's important to note that no errors will occur in this scenario, so there's no need for a catch block.

For more information on these methods, you can visit this page.

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