Javascript set value of dropdown

[Kristof DeGroote]

Hi Community, 

I'm trying to set or select the value of a dropdown list based on the value of another field.
I tried this code on the validation but with no result. Y being the dropdown field.

function validate(FieldContext, attributeValue, changedValue, errorMessage) {
   if (attributeValue == "X") {
    FieldContext.setFieldValue("Y", "value");

Thanks already for your help,

[Jack Saunders]

Let me know if this works for you.  Drop down code included just for better clarity with the function.

<label for="dropdown">Select a value:</label>
  <select id="dropdown" onchange="setValue()">
    <option value="option1">Option 1</option>
    <option value="option2">Option 2</option>
    <option value="option3">Option 3</option>
  </select>

  <input type="text" id="result" readonly>

  <script>
    function setValue() {
      // Get the selected value from the dropdown
      var selectedValue = document.getElementById("dropdown").value;

      // Set the value to the input field
      document.getElementById("result").value = selectedValue;
    }
  </script>