How can I set a javascript const to a value in a form element that could be either a dropdown select or a checked radio button?

I have an html form in a django site that is used for both add and update. If the form is for a new entry, I want the field estimateType to be radio buttons with three choices, one of which is checked by default. If the form is for an edit to an existing entry, I want the form widget to change to a select dropdown with additional choices to pick from.

In the javascript in the onchange event, I need to know what the value of the estimateType field is. I can get it to work for select, or radio input, but not both. For example, what I have right now is:

const estimateType = document.querySelector(input[name=estimateType]:checked).value;

That works for a radio button but not the select dropdown. How can I use the same const declaration but account for heterogeneous form input types?

You can use a comma to separate the selectors and it'll pull what it finds: Note that the JS is the identical for each snippet.

const estimateType = document.querySelector("input[name=estimateType]:checked,select[name=estimateType]").value;
console.log(estimateType)
<input type="radio" name="estimateType" value="A">A
<input type="radio" name="estimateType" value="B" checked>B
<input type="radio" name="estimateType" value="C">C

const estimateType = document.querySelector("input[name=estimateType]:checked,select[name=estimateType]").value;
console.log(estimateType)
<select name="estimateType" >
  <option value="A">A</option>
  <option value="B">B</option>
  <option value="C">C</option>
  <option value="D" selected>D</option>
  <option value="E">E</option>
</select>

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