Http request to a website to get the content of a specific html element

I am building a site to help students schedule their university courses. It will include things like days, times, professor, etc. I want to fetch the "rating" of professors off www.ratemyprofessors.com and have it show on my site. For example, at https://www.ratemyprofessors.com/ShowRatings.jsp?tid=1230754 you can see Michael has a rating of 4.6. I want to request that data and have it show on the site. I can't scrape it beforehand as their ratings change and I want it to show their current rating. Am I able to do this with an XmlHttpRequest? How would I do that? I'm hoping to do it in JavaScript.