Enable disabled select value which is dynamically created

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I have select options which are dynamically created. What I want to do is, when the number of rooms is 0, the number of people option to be disabled, otherwise to be enabled. I tried a couple of things but they work only for the first select. How can I get them to work for all dynamically created selects?

HTML

<select name="numberOfRooms" id="numberOfRooms"
   th:field="*{rooms[__${rowStat.index}__].numberOfRooms}">
   <option value="0">0</option>
   <option value="1">1</option>
   <option value="2">2</option>
   <option value="3">3</option>
   <option value="4">4</option>
</select>
<select name="numberOfPeople" id="numberOfPeople" disabled="disabled"
   th:field="*{numberOfPeople}">
   <option value="0">0</option>
   <option value="1">1</option>
   <option value="2">2</option>
   <option value="3">3</option>
   <option value="4">4</option>
</select>

What I have tried:

JavaScript

$(document).ready(function () {
    $('#numberOfRooms').on('change', function () {
        let val = $('#numberOfRooms').val();
        console.log(val);
        if (val == 0) {
            $('#numberOfPeople').attr('disabled', true);
        } else {
            $('#numberOfPeople').attr('disabled', false);
        }
    })
})

I also tried with onchange() but same result.

Posted 4-Feb-22 11:54am

Member 15471521

Updated 7-Feb-22 0:00am

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Richard Deeming · Answer 1 · 2022-02-07T00:00:00

Read the "Attributes vs. Properties" section of the documentation[^].

The value of the disabled attribute is the string "disabled".

The value of the disabled property is true or false.

Change your code to use .prop("disabled", false) instead of .attr("disabled", false).

Also read the documentation for the ready event[^]: the $(document).ready(...) syntax has been deprecated since jQuery v3. The recommended version is simply $(...), which does the same thing.

JavaScript

$(function () {
    $('#numberOfRooms').on('change', function () {
        let val = $('#numberOfRooms').val();
        console.log(val);
        if (val == 0) {
            $('#numberOfPeople').prop('disabled', true);
        } else {
            $('#numberOfPeople').prop('disabled', false);
        }
    })
})