Depend dropdown bootstrap-select

Question

I'm using bootstrap-select and I want to have dependant dropdown. The first is category :

<select class="selectpicker" id="category">
     <option value="1"> Fruit </option>
     <option value="2"> Animal</option>
</select>

The second is a list of items, the class indicate the category

<select class="selectpicker" id="items">
     <option class="1" value="1"> Banana </option>
     <option class="1" value="2"> Apple </option>
     <option class="2" value="3"> Cat </option>
     <option class="2" value="4"> Dog</option>
</select>

My goal is when the user select a filter one or more category it's filter also the items dropdown

This code works for one selection but not for 2. How can I do that ?

<script>
  $("#category").change(function () {
    var category= $(this).val());
    $('option').each(function() {
    if ($(this).hasClass(category)) {
      $(this).show();
    } else {
      $(this).hide();
    }
    });
    $('.selectpicker').selectpicker('refresh');

  });
</script>

Answer 1

You need to loop through items select options but in your current code you are checking the option of both select-boxes hence the values which do not have required class are getting hidden from category select-box as well .Instead change $('option') to $('#items option') and then onces value is change you can set some default option as selected using .val("default").trigger('change') to items select-box.

Demo code :

 $("#category").change(function() { var category = $(this).val(); //loop through second selects options $('#items option').each(function() { //if option has default class if ($(this).hasClass(category) || $(this).hasClass("default")) { $(this).show(); } else { $(this).hide(); } }); $('.selectpicker').selectpicker("refresh"); $('#items').val("0").trigger('change');//set default value as selected });

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.1/js/bootstrap.min.js"></script> <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.18/css/bootstrap-select.min.css"> <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.13.18/js/bootstrap-select.min.js"></script> <select class="selectpicker" id="category"> <option value="1"> Fruit </option> <option value="2"> Animal</option> </select> <select class="selectpicker" id="items"> <!--added this just to keep default value selcted--> <option class="default" value="0"> --Select-- </option> <option class="1" value="1"> Banana </option> <option class="1" value="2"> Apple </option> <option class="2" value="3"> Cat </option> <option class="2" value="4"> Dog</option> </select>

Answer 2

How to load the second select data using ajax call. Actually I have a state and city dropdown options. It is not possible to load all the cities in one go. so i want to load cities based on the state selected. Dropdown Image