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Javascript: Setting a dropdown based on another dropdown selection

I have 2 dropdowns, mySelect and myMins

When a selection is made from mySelect, I want to check and see if it is the last option in the list. If it is, I want to set myMins to the first option and disable it. If not, enable myMins.

How would I do this?
JavaScriptjQueryWeb DevelopmentBootstrap

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Julian Hansen

8/22/2022 - Mon
Julian Hansen

The principle of linking dropdowns is explained in this article

For your specific requirement you need to attach an event handler to the first drop down
<select name="mySelect" id="mySelect">
    <option value="">Choose</option>
    <option value="somevalue1">SomeValue1</option>
    <option value="somevalue2">SomeValue2</option>
    <option value="somevalue3">SomeValue3</option>
<select name="myMins" id="myMins">
    <option value="">Choose</option>
    <option value="minsvalue1">MinsValue1</option>
    <option value="minsvalue2">MinsValue2</option>
    <option value="minsvalue3">MinsValue3</option>

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var lastval = $('#mySelect option:last-child').val();
var firstval = $('#myMins option:eq(1)').val();

$(function() {
  $('#mySelect').change(function() {
    if (this.value == lastval) {
      $('#myMins').val(firstval).prop({disabled: true});
    else {
      $('#myMins').val('').prop({disabled: false});

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Working sample here

Ok, this was kind of inline with what I was trying. I think my problem is that mySelect is populated by other selections made by the user.
So this is what the HTML looks like even when filled with selections:
<select id="mySelect" name="Hour" required="required"></select>

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Is there still a way to do this?
Julian Hansen

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Fantastic. Thank you!
I started with Experts Exchange in 2004 and it's been a mainstay of my professional computing life since. It helped me launch a career as a programmer / Oracle data analyst
William Peck
Julian Hansen

You are welcome.