What is the best way to automatically scroll to the chosen option when a button is clicked?

Is there a way to make the select box automatically scroll and show the selected option when the focus button is clicked? The current method I am using with focus does not achieve this. Are there any JavaScript or jQuery methods that can help me solve this issue?

    <!DOCTYPE html>
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title></title>
        <script src="Scripts/jquery-2.1.4.js"></script>
        <script>
            $(document).ready(function () {
                $("#focus").click(function () {
                    $("select#selectId").find(":selected").focus();
                });
            });
        </script>
    </head>
    <body>
        <select title="Title" id="selectId" style="width: 143px; height: 125px; overflow: scroll;" multiple="multiple">
        <option  value="1">1 </option>
        <option  value="2">2 </option>
        <option  value="3">3</option>
        <option  value="4">4</option>
        <option  value="5">5</option>
        <option  value="6">6</option>
        <option  value="7">7</option>
        <option  value="8">8</option>
        <option  value="9">9</option>
        <option  value="10">10</option>
        <option  value="11">11</option>
        <option  value="12">12</option>
        <option  value="13">13</option>
        <option  value="14">14</option>
        <option  value="15">15</option>
        <option  value="16">16</option>
        <option  value="17">17</option>
        <option  value="18">18</option>
        <option  value="19">19</option>
        <option  value="20">20</option>
        <option  value="21">21</option>
        <option  value="22">22</option>
        <option  value="23">23</option>
        <option  value="24">24</option>
        <option  value="25">25</option>
        <option  value="26">26</option>
        <option  value="27">27</option>
        <option  value="28">28</option>
        <option  value="31">31</option></select>
        <button type="button" id="focus">focus on selected</button>
    </body>
    </html>

Answer №1

To make an element scroll into view, you can utilize the scrollIntoView() DOM method like this:

$(document).ready(function () {
    $("#focus").click(function () {
        $("#selectId").focus().find(":selected")[0].scrollIntoView();
    });
});

Note: It's worth mentioning that this code may not work on IE11 or other versions of Internet Explorer.

Answer №2

$(document).ready(function () {
 $("#focus").click(function () {
     var index = $("select#selectId").find(":selected").index();
     $('#selectId').animate({
        scrollTop: index * 14
     }, 500);
 });
});

This alternative method allows you to adjust the scroll speed as needed.

Answer №3

I have developed a straightforward script to address this issue. My approach is more effective because the select content in my scenario changes dynamically, resulting in an inconsistent scroll height. For reference, you can view the script in action here: https://jsfiddle.net/962vxk4f/

$(document).ready(function () {
   $("#focus").click(function (e) {
      $selectId = $("#selectId");
      var $index = $selectId.find(":selected").index();
      var lastPos = 0;
      $selectId.children().each(function () { lastPos++; });
      var currScrollPos = ($index / lastPos) * parseInt($selectId[0].scrollHeight);
      $selectId.scrollTop(currScrollPos);
   });
});

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