Form field data is not save when field text is updated with javascript

[moe]

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Store data from the javascript?

Continuing the discussion from Run basic math in real time on a form using JavaScript: Hi Instead of an html, I used an input field to display the result of my basic math problem. It is displaying the value of the total on the input field but when I tried to submit the button, it is not recording it. This is the code: var amountInput = $('#'+amountInputId).val(); var quantityAmount = $('#'+quantityAmountId).val(); var total = amountInput * quantityAmount; …