Having trouble unchecking the checkbox when the dropdown is set to 0

I am currently working on enhancing the functionality of my ordering form.

  1. When a checkbox is checked, the quantity dropdown value will change to 1.
  2. When a checkbox is unchecked, the quantity dropdown value will change to 0.
  3. If the quantity dropdown value is set to anything other than 0, the checkbox will automatically be checked.
  4. If the quantity dropdown value is set to 0, then the checkbox will be unchecked.

I have successfully implemented most of these features, however, I am facing an issue with number 4 - the checkbox does not uncheck when the dropdown is set to 0.

Here is the code snippet:

$(document).ready(function() {
  $(".product input:checkbox").change(function() {
    if ($(this).is(":checked")) {
      $(this).siblings("select").val(1);
    } else {
      $(this).siblings("select").val(0);
    }
  });
  
  $(".product select").change(function() {
    if ($(this).val != '0') {
      $(this).siblings("input:checkbox").prop("checked", true);
    }else{
      $(this).siblings("input:checkbox").prop("checked", false);
    }
  });
});

Answer №1

Utilize the val() function instead of the val property to retrieve the value.

if ($(this).val() !== '0') {

Answer №2

Another option is to utilize the $(element).prop() method, as explained in the jQuery Documentation on prop.
Prop can also be used for assigning values to elements, refer to the documentation for more details.

if ( $(this).prop('selected') ) {
  // your code ...
}

You can also verify the selectedIndex by:

$(element).prop('selectedIndex', 0);

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