I need to show the submit button on many forms on the same page only if one option from a select is selected.

I have:

```html
<form id="1">
    <input type="text">
    <select>
        <option value="">Select one value</option>
        <option value="1">value 1</option>
        <option value="2">value 2</option>
    </select>
    <input type="submit">
</form>

and

<form id="2">
  <input type="text">
  <select>
    <option value="">Select one value</option>
    <option value="1">value 1</option>
    <option value="2">value 2</option>
  </select>
  <input type="submit">
</form>
```

so, I need to show the submit button only if an option of the select is selected
Thanks!!!