What causes the vertical scroll bar to shift on its own?

I'm puzzled by the behavior of the vertical scroll bar when clicking on "Line 9" - it automatically moves to the top position and subsequent clicks don't affect it. Can someone shed light on why this happens and how to resolve it? I am using Firefox 3.6.3.

Here is the HTML code snippet:

<html>
    <head>
        <link rel="stylesheet" href="test.css" type="text/css" />
        <script src="http://code.jquery.com/jquery-latest.js"></script>
        <script language="JavaScript" src="test.js"></script>
    </head>

    <body>
        <div>
            <table>
                <tr row='0'><td class='column1'>Line 0</td></tr>
                <tr row='1'><td class='column1'>Line 1</td></tr>
                <tr row='2'><td class='column1'>Line 2</td></tr>
                <tr row='3'><td class='column1'>Line 3</td></tr>
                <tr row='4'><td class='column1'>Line 4</td></tr>
                <tr row='5'><td class='column1'>Line 5</td></tr>
                <tr row='6'><td class='column1'>Line 6</td></tr>
                <tr row='7'><td class='column1'>Line 7</td></tr>
                <tr row='8'><td class='column1'>Line 8</td></tr>
                <tr row='9'><td class='column1'>Line 9</td></tr>
            </table>
        </div>
    </body>
</html>

The JS code snippet:

$(document).ready(function() {
    $(".column1").each(function(index) {
        $(this).after("<td class='column2'>Details " + index + "</td>");
        $(this).toggle(function() { $("[row='" + index + "'] .column2").fadeIn("fast") },
                       function() { $("[row='" + index + "'] .column2").fadeOut("fast") });
    });
});

CSS styling:

div {
    overflow: auto;
    height: 100px;
    width: 300px;
    border: 1px solid blue;
}

.column1 {
    cursor: pointer;
    width: 100px;
    background-color: green;
    color: white;
}

.column2 {
    display: none;
    width: 200px;
    background-color: blue;
    color: white;
}

Answer №1

Upon conducting various trial and error tests, it appears that the issue is linked to the moment when the browser recalculates and redraws the table after fading in or out a cell. Your code is correct, and jQuery effectively toggles the 'display' property of the cell - indicating a minor bug specific to Firefox.

To address this, one workaround would be to avoid directly toggling the table cells themselves. Instead, consider toggling the contents of the column2 cell. Below is an example:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
    <head>
        <link rel="stylesheet" href="test.css" type="text/css" />
        <script src="http://code.jquery.com/jquery-latest.js"></script>
        <script language="JavaScript">
        $(document).ready(function() {
            $("td.column1").each(function(index) {
                $(this).after('<td class="column2"><span class="details">Details ' + index + '</span></td>');
                $(this).toggle(
                  function(){$(this).siblings('.column2').children('span.details').fadeIn("fast")},
                  function(){$(this).siblings('.column2').children('span.details').fadeOut("fast")}
                ) 
            });
        });
        </script>
        <style type="text/css" media="screen">
          div {
              overflow: auto;
              height: 100px;
              width: 300px;
              border: 1px solid blue;
          }

          .column1 {
              cursor: pointer;
          }

          .column2 .details{
              display:none;
          }

        </style>
    </head>

    <body>
        <div>
            <table>
                <tr row='0'><td class='column1'>Line 0</td></tr>
                <tr row='1'><td class='column1'>Line 1</td></tr>
                <tr row='2'><td class='column1'>Line 2</td></tr>
                <tr row='3'><td class='column1'>Line 3</td></tr>
                <tr row='4'><td class='column1'>Line 4</td></tr>
                <tr row='5'><td class='column1'>Line 5</td></tr>
                <tr row='6'><td class='column1'>Line 6</td></tr>
                <tr row='7'><td class='column1'>Line 7</td></tr>
                <tr row='8'><td class='column1'>Line 8</td></tr>
                <tr row='9'><td class='column1'>Line 9</td></tr>
            </table>
        </div>
    </body>
</html>

In this updated script, the column2 cell remains visible throughout, with the <span class="details"> within it being shown/hidden as needed. I have tested this version on Firefox 3.6.3 and can confirm it functions correctly!

Furthermore, I optimized your jQuery selectors for improved performance. Feel free to ask if you'd like more details on this optimization!

Answer №2

After implementing your code on both Firefox 3.6.3 and Chrome 5.0.375.29, I did not experience the issue you described. As a result, I am unsure of what may be causing it.

The scrollbar only moved when scrolling in the usual manner, not when clicking on the text.

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