retrieve matrix table selected values using javascript?

Thank you ahmedA! it worked. Is there any other way without adding any page break? If it needs additional javascript (adding an event to the matrix table) I am also fine with that one.
Thank you!

thanks ahmedA!
On the same question without adding any page breaks, I have added the following code within the Qualtrics.SurveyEngine.addOnReady and Qualtrics.SurveyEngine.addOnPageSubmit functions
$('NextButton').onclick = function (event) {
alert("${q://QID81/SelectedAnswerRecode/1}")
alert("${q://QID81/SelectedAnswerRecode/2}")
};
and got an empty alert window. Can you please suggest if my code is correct and provide a direction? Thank you!

thanks ahmedA,
I can retrieve the values from input boxes, multiple choice or forms on the page. However, for the matrix table I don't know how to retrieve the values without asking the server. I have searched on the the internet and couldn't find it. If you can share a resource that enables me to get the values of a matrix table on the page using jquery or any other form of javascript that would be great!
There is nothing special: on the page I need to retrieve the selected values from the matrix table to calculate an embedded field.
Thank you for your help.

thank you ahmedA. since this is a university project I need to get approval from the committees before sharing anything even if it is a preview. thank you for your help.