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Editorial Team
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Asked: 2026-05-27T21:21:23+00:00

My below code is working fine when used in HTML. The same code I

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My below code is working fine when used in HTML. The same code I tried to place it inside a form and it stopped working. How to fix this issue?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<script src="jquery-1.7.1.min.js" ></script>
<title>Chat scroll test</title>
<style type="text/css">
#chat
{
    width: 200px;
    height: 200px;
    border: 1px solid black;
    overflow-y: auto;
}
</style>
<script>
    jQuery(document).ready(function ($) {
        monitor = function () {
            var $this = $(this),
        wrap = $this.find('.wrapper'),
        height = $this.height(),
        maxScroll = wrap.height() - height,
        top = $this.scrollTop();
            if (maxScroll === top) {
                $this.addClass('atBottom');
            } else {
                $this.removeClass('atBottom');
            }
        }
        window.setInterval(function () {
            monitor.call($('#chat').get(0));
        }, 350);
        $('#chat').bind('addMessage', function (e, message) {
            var $this = $(this),
        top = $this.scrollTop(),
        scroll = $this.hasClass('atBottom');
            $this.find('.wrapper').append(message);
            if (scroll) {
                var wrap = $this.find('.wrapper'),
            height = $this.height(),
            maxScroll = wrap.height() - height
                $this.scrollTop(maxScroll);
            }
        })
        $('button').click(function () {
            $('#chat').trigger('addMessage', 'asdgagasdg<br/>');
        });
    });
</script>
</head>

<body>
<form id="form1" runat="server">
<div id="chat">
    <div class="wrapper">
        adsgasgda<br/>
        adsgasg<br/>
        asd<br/>
        adsgasgda<br/>
        adsgasg<br/>
        adsgasgda<br/>
        adsgasg<br/>
        adsgasgda<br/>
        adsgasg<br/>
        adsgasgda<br/>
        adsgasg<br/>
        adsgasgda<br/>
        adsgasg<br/>
        adsgasgda<br/>
        adsgasg<br/>
    </div>
</div>
<button>Add a line</button>
</form>
</body>
</html>

When form tag is removed it again starts back to work.

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1 Answer

  1. Editorial Team

    When you have a inside a automatically submits the form.
    Replace the

    <button>Add a line</button>

    with a 

    <input type="button" value="Add a line" />

    and that way the browser doesn’t post the form when it’s clicked.

    Remember also to change the jQuery selector from

    $('button').click(function () {

    to something like

    $(':button').click(function () {
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