DIVYAM SOLANKI DIVYAM SOLANKI - 2 months ago 8
CSS Question

Chat box, auto scroll to bottom

How to auto scroll chat box

HTML:

<!DOCTYPE html>
<html lang="en"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="robots" content="noindex">
<title>College Enquiry Chat</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link href="assets/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">

<script src="assets/js/jquery-1.10.2.min.js"></script>
<script src="assets/js/bootstrap.min.js"></script>
<script type="text/javascript">
window.alert = function(){};
var defaultCSS = document.getElementById('bootstrap-css');
function changeCSS(css){
if(css) $('head > link').filter(':first').replaceWith('<link rel="stylesheet" href="'+ css +'" type="text/css" />');
else $('head > link').filter(':first').replaceWith(defaultCSS);
}
</script>
</head>
<body>
<div class="panel panel-primary" style="border:0px">
<div class="panel-heading top-bar">
<div class="col-md-8 col-xs-8">
<h3 class="panel-title"><span class="glyphicon glyphicon-comment" style="margin-right:6px;"></span>College Enquiry Chat</h3>
</div>
</div>


<div class="panel-body msg_container_base">

<div class="row msg_container base_sent">
<div class="col-md-10 col-xs-10">
<div class="messages msg_sent">
<p>that mongodb thing looks good, huh?
tiny master db, and huge document store</p>
</div>
</div>
</div>

<div class="row msg_container base_receive">
<div class="col-md-10 col-xs-10">
<div class="messages msg_receive">
<p>that mongodb thing looks good, huh?
tiny master db, and huge document store</p>
</div>
</div>
</div>

<chat_log> . </chat_log>
</div>

<!--CHAT USER BOX-->
<div class="panel-footer">
<div class="input-group" id="myForm">
<input id="btn-input" type="text" class="form-control input-sm chat_input" placeholder="Write your message here...">
<span class="input-group-btn">
<button class="btn btn-primary btn-sm" id="submit" type="submit">Send</button>
</span>
</form>
</div>
</div>
</div>
</div>
</div>
</div>


Javascript:

<script>
$("#submit").click(function() {
var data = $("#btn-input").val();
//console.log(data);
$('chat_log').append('<div class="row msg_container base_sent"><div class="col-md-10 col-xs-10"><div class="messages msg_receive"><p>'+data+'</p></div></div></div><div class="row msg_container base_receive"><div class="col-md-10 col-xs-10"><div class="messages msg_receive"><p>'+data+'</p></div></div></div>');
clearInput();
});

function clearInput() {
$("#myForm :input").each(function() {
$(this).val(''); //hide form values
});
}

$("#myForm").submit(function() {
return false; //to prevent redirection to save.php
});
</script>


CSS :

.msg_container_base{
background: #e5e5e5;
margin: 0;
padding: 0 10px 10px;
max-height:80vh;
overflow-x:hidden;
}
.top-bar {
background: #666;
color: white;
padding: 10px;
position: relative;
overflow: hidden;
}
.msg_receive{
padding-left:0;
margin-left:0;
}
.msg_sent{
padding-bottom:20px !important;
margin-right:0;
}
.messages {
background: white;
padding: 10px;
border-radius: 2px;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
max-width:100%;
}
.messages > p {
font-size: 13px;
margin: 0 0 0.2rem 0;
}
.messages > time {
font-size: 11px;
color: #ccc;
}
.msg_container {
padding: 10px;
overflow: hidden;
display: flex;
}
img {
display: block;
width: 100%;
}
.avatar {
position: relative;
}
.base_receive > .avatar:after {
content: "";
position: absolute;
top: 0;
right: 0;
width: 0;
height: 0;
border: 5px solid #FFF;
border-left-color: rgba(0, 0, 0, 0);
border-bottom-color: rgba(0, 0, 0, 0);
}

.base_sent {
justify-content: flex-end;
align-items: flex-end;
}
.base_sent > .avatar:after {
content: "";
position: absolute;
bottom: 0;
left: 0;
width: 0;
height: 0;
border: 5px solid white;
border-right-color: transparent;
border-top-color: transparent;
box-shadow: 1px 1px 2px rgba(black, 0.2); // not quite perfect but close
}

.msg_sent > time{
float: right;
}



.msg_container_base::-webkit-scrollbar-track
{
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,0.3);
background-color: #F5F5F5;
}

.msg_container_base::-webkit-scrollbar
{
width: 12px;
background-color: #F5F5F5;
}

.msg_container_base::-webkit-scrollbar-thumb
{
-webkit-box-shadow: inset 0 0 6px rgba(0,0,0,.3);
background-color: #555;
}

.btn-group.dropup{
position:fixed;
left:0px;
bottom:0;
}


Following code functions shows, what user input and when click on send, user will see, his sended messaged in two way.. one in sended & received form.

Is there a way to auto-scroll to bottom

Answer

Check this fiddle. You just need to add scrollTop() to the .msg-container-base

https://jsfiddle.net/Pranesh456/w6p5b3x6/