Final answer:
The correct event to use when designing a webpage to check for cookies and record the last visit time upon page load is the onload event.
This event ensures that the cookie check and setting operations occur after the page is fully loaded and all resources are available.
Therefore, the correct answer is: option 'onload.
Step-by-step explanation:
The onload event triggers when the entire page, including all dependent resources like images and scripts, is fully loaded.
This is the best time to check for cookies because you can be sure that all the elements of the page are available and you can interact with the Document Object Model (DOM) to read or write cookies.
To implement this, you would typically write a JavaScript function that checks for the presence of the cookie and, if not found or if you wish to update it, creates or updates the cookie with the current date and time.
This function should then be called during the window's onload event. Example:
window.onload = function() {
if (navigator.cookieEnabled) {
// Code to check for the cookie
// Code to set or update the cookie
} else {
// Handle the situation when cookies are not enabled
}
};