javascript - Scroll down to selected option on button click using jquery -


i have list of countries this:

screenshot

the list extensive. need able on button click move (focus) specified country.

there many threads in stackoverflow none of them worked. example tried this:

var code = 40; $('#id_resource-regions').val(code).scrolltop(160);

there no response , no error/warnings in developers tool. note list created using django forms , templates.

  • select option element looking for.
  • get offset top position using .offset(), of selected option element.
  • get offset top of select element.
  • use .scrolltop() scroll desired option.

here example

var btn = $('button')  var select = $('select')    btn.on('click', function() {    var option = select.find("option:contains('item-30')");    var optiontop = option.offset().top    var selecttop = select.offset().top;    select.scrolltop(select.scrolltop() + (optiontop - selecttop));    option.prop('selected', true)  })
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>    <select name="" id="select" multiple="multiple">    <option value="">item-1</option>    <option value="">item-2</option>    <option value="">item-3</option>    <option value="">item-4</option>    <option value="">item-5</option>    <option value="">item-6</option>    <option value="">item-7</option>    <option value="">item-8</option>    <option value="">item-9</option>    <option value="">item-10</option>    <option value="">item-11</option>    <option value="">item-12</option>    <option value="">item-13</option>    <option value="">item-14</option>    <option value="">item-15</option>    <option value="">item-16</option>    <option value="">item-17</option>    <option value="">item-18</option>    <option value="">item-19</option>    <option value="">item-20</option>    <option value="">item-21</option>    <option value="">item-22</option>    <option value="">item-23</option>    <option value="">item-24</option>    <option value="">item-25</option>    <option value="">item-26</option>    <option value="">item-27</option>    <option value="">item-28</option>    <option value="">item-29</option>    <option value="">item-30</option>    <option value="">item-31</option>    <option value="">item-32</option>    <option value="">item-33</option>    <option value="">item-34</option>    <option value="">item-35</option>    <option value="">item-36</option>    <option value="">item-37</option>    <option value="">item-38</option>    <option value="">item-39</option>    <option value="">item-40</option>  </select>    <button>move item 30</button>


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