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<form id="FORM_ID" class="purchaseForm">
    <button type="submit" form="FORM_ID" value="Submit">Submit</button>
</form>

$('.purchaseForm').on('submit', function (e) {
    e.preventDefault();
    e.stopPropagation(); // Key shit !
    
    console.log(e.currentTarget[0].value); // value of first form field
});