A guide on leveraging the power of WebElementPromise in Selenium

Just like falling in love with promises only after the arrival of async/await, my journey with this concept has been a puzzle.

/**
 * WebElementPromise is a promise that will be fulfilled with a WebElement.
 * This serves as a forward proxy on WebElement, allowing calls to be
 * scheduled without directly on this instance before the underlying
 * WebElement has been fulfilled. In other words, the following two statements
 * are equivalent:
 *
 *     driver.findElement({id: 'my-button'}).click();
 *     driver.findElement({id: 'my-button'}).then(function(el) {
 *       return el.click();
 *     });

The presence of then() in the second statement makes logical sense - the promise resolves with the element, and then executes then().

However, I find myself pondering over what’s happening when we have

driver.findElement({id: 'my-button'}).click();
. The call to
driver.findElement({id: 'my-button'})
results in an unfilled promise. As far as I know, a promise can only have then() and catch(). So, what exactly is the role of click() here?

Moreover, the explanation mentioning a “forward proxy” leaves me bewildered and lost in understanding.

Answer №1

Since WebElementPromise is an extension of WebElement, it inherits the click() method from WebElement. Additionally, it implements the then() and catch() methods, allowing it to be used as a promise as well.

https://i.sstatic.net/VtNaw.png

For more detailed information, please refer to the source code here.

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