How to get all selected values from <select multiple=multiple>?

Answer 1

If you need to respond to changes, you can try this:

document.getElementById('select-meal-type').addEventListener('change', function(e) {
    let values = [].slice.call(e.target.selectedOptions).map(a => a.value));
})

The [].slice.call(e.target.selectedOptions) is needed because e.target.selectedOptions returns a HTMLCollection, not an Array. That call converts it to Array so that we can then apply the map function, which extract the values.