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I want to create chatbot widget plugin in nopcommerce 4.1 or above

I am new to nopcommerce,I understood all the basic code flow of nopcommerce.So Now i started replicating plugins (widgets).I created a plugin can install and uninstall but no idea how to create a widget and add it commonly in all pages.what i am trying to achieve is call the iframe component inside the chat bar.I'll add the code of view in this question
Now i added this code in nop.web/shared/_root.cshtml. So now chat bar comes in all pages
<div>
<a class="float" id="button" onclick="openForm()">
<img src="~/files/chatbotv4/VertChat.png" class="my-float">
</a>
<div class="chat-popup" id="myForm">
<div class="chathead">
<div class="btn-close">
<button type="button" class="close" onclick="closeForm()">_</button>
</div>
<div class="btn-max" id="max">
<div type="button" class="fa fa-window-maximize" style="background-color:#16c886; font-size:21px;" onclick="max_chat()">&square;</div>
</div>
<div class="btn-min" id="min">
<div type="button" class="fa fa-window-restore" style="background-color:#16c886; font-size:21px;" onclick="min_chat()">❐</div>
</div>
</div>
<iframe src='~/files/chatbotv4/botchat.html?name=#customerName&id=#customerId' style='min-width: 100%; width: 100%; min-height: 100%;'></iframe>
</div>
</div>
<script>
function openForm() {
document.getElementById("myForm").style.display = "block";
document.getElementById("button").style.display = "none";
document.getElementsByClassName("header")[0].style.zIndex = "0";
document.getElementsByClassName("header-menu")[0].style.zIndex = "0";
document.getElementsByClassName("footer-lower")[0].style.zIndex = "-1";
//$(".header").css("csstext", " z-index: 0 ;");
//$(".header-menu").css("csstext", " z-index: 0;");
}
function closeForm() {
document.getElementById("myForm").style.display = "none";
document.getElementById("button").style.display = "block";
document.getElementsByClassName("header")[0].style.zIndex = "1";
document.getElementsByClassName("header-menu")[0].style.zIndex = "1";
document.getElementsByClassName("footer-lower")[0].style.zIndex = "1";
}
function max_chat() {
document.getElementById("max").style.display = "none";
document.getElementById("min").style.display = "block";
// $(".chat-popup").css("cssText", " width: 50%;");
document.getElementsByClassName("chat-popup")[0].style.width = "50%";
}
function min_chat() {
document.getElementById("min").style.display = "none";
document.getElementById("max").style.display = "block";
document.getElementsByClassName("chat-popup")[0].style.width = "30%";
}
</script>
<style>
body {
font-family: Arial, Helvetica, sans-serif;
}
* {
box-sizing: border-box;
}
/* Button used to open the chat form - fixed at the bottom of the page */
.open-button {
background-color: #555;
color: white;
padding: 16px 20px;
border: none;
cursor: pointer;
opacity: 0.8;
position: fixed;
bottom: 23px;
right: 28px;
width: 280px;
}
/* The popup chat - hidden by default */
.chat-popup {
display: none;
position: fixed;
bottom: 0;
right: 15px;
border: 3px solid #f1f1f1;
z-index: 1;
height: 100%;
width: 30%;
}
iframe {
background-color: white;
min-height: 95% !important;
min-width: 100%
}
.btn-close {
padding-left: 95%;
position: absolute;
z-index: 1032;
}
.close {
background: transparent;
border: none;
}
.float {
position: fixed;
width: 60px;
height: 60px;
bottom: 20px;
right: 20px;
background-color: #0C9;
//color:#FFF;
border-radius: 50px;
text-align: center;
box-shadow: 2px 2px 3px #999;
z-index: 1030;
}
.my-float {
margin-top: 1px;
margin-left: auto;
height: 58px;
width: 58px;
}
.btn-max {
padding-left: 87%;
position: absolute;
margin-top: 0.2%;
z-index: 1032;
cursor: pointer;
}
.btn-min {
padding-left: 90%;
position: absolute;
margin-top: 0.2%;
z-index: 1032;
display: none;
cursor: pointer;
}
.chathead {
height: 5%;
width: 100%;
position: relative;
background-color: #16c886;
}
</style>
now i want to add it as a seperate widget.

The widget is a defined area where a developer can inject his/her expected functionality. There are already a lot of widgets define by the core team, one of a good example of the widget plugin is NivoSlider. In your plugin you have to implement IWidgetPlugin and need to define expected viewcomponent name of your plugin at "GetPublicViewComponent" method and the name of the widget of nopcommerce at "GetWidgetZones" method where you want to show the viewcomponent at a public site. If you want to know more about the widget plugin, you can visit DEVELOP AND UNDERSTAND WIDGET PLUGIN IN NOPCOMMERCE 4.10 WITH REAL-TIME COMMUNICATION

how to change the cssclass of a div after press a button in asp.net c#?

I am trying to change the background of a div after clicking a button. this are the codes.
Div I want to change color:
<div id="example1" runat="server">
</div>
and CSS for it:
#example1 {
position: absolute;
z-index: 5;
top:0;
background-color: orange;
width: 310px;
height: 34px;
color: white;
border-radius: 4px;
}
I want to change it to this:
#example2 {
position: absolute;
z-index: 5;
top:0;
background-color: red;
width: 380px;
height: 38px;
color: white;
border-radius: 4px;
}
I tried to write some code at Page.aspx.cs
example1.CssClass = "example2";
but looks like CssClass is not a function of the div. how can I add it? or whats a way to do it on C#?

You don't have to go back to server, in order to change the color of your div. This can be done solely on client by writing a simple script:
var example1 = document.getElementById("example1");
example1.addEventListener("click", function(){
this.className = "example2";
});
.example2 {
position: absolute;
z-index: 5;
top:0;
background-color: red;
width: 380px;
height: 38px;
color: white;
border-radius: 4px;
}
<div id="example1" runat="server">
sample text
</div>
Important Note
In your case, since your div is a server side control, (runat="server"), the id that is generated before the page is sent to the client is not example1. So in the script I presented above we have to make a change:
var example1 = document.getElementById("<%= example1.ClientID%>");

For this answer, I will assume based on your code that you will be handling the click event on the back end.
The issue is your CSS is targeting the elements by id but you are trying to assign a CSS class by name.
First, change your div to use the class by name:
<div id="example1" class="example1" runat="server">
</div>
(The name of the class is your choice. I just used the same for simplicity)
Then change your CSS classes to NOT target an id:
.example2 {
position: absolute;
z-index: 5;
top:0;
background-color: red;
width: 380px;
height: 38px;
color: white;
border-radius: 4px;
}
Notice the period (.) instead of the hash (#).

Why is there a space between a H3 and DIV

I have the following code in ASP.net which displays a header and a ListBox:
<div id="divEntMain">
<div class="clsEntMain">
<h3>Entities</h3>
<div class="clsLBHolder">
<asp:ListBox ID="lbEnt" ClientIDMode="Static" runat="server"></asp:ListBox>
</div>
</div>
</div>
The CSS defines the look:
.clsEntMain h3
{
background: #F06600;
color: #fff;
text-shadow: 0 -1px 1px rgba(0,0,0,0.7);
border-radius: 10px 10px 0 0;
padding: 13px 20px;
font-size: 12px;
text-align: left;
text-transform: uppercase;
}
#divEntMain
{
width: 100%;
text-align: center;
padding: 0;
margin: 0;
}
#lbEnt
{
width: 100%;
height: 140px;
margin: 0;
padding: 0;
}
Here is the output:
If I modify to this The ListBox moves up just a little bit but I don't want to as the spacing might change based on screen resolution.:
<div style="margin-top: -5px;" class="clsLBHolder">
Why is there a space between the orange H3 and the ListBox?

The default margin for h3 is :
margin-before: 1em;
margin-after: 1em;
margin-start: 0;
margin-end: 0;
To override this, you could
h3{
margin: 0;
}
More info about default properties for html elements here: http://www.w3.org/TR/html-markup/h3.html

How to resize a div element automatically so that the content fits

I need to do a lot of divs inside other divs, and I can't seem to understand what is the problem with my code, so the divs do not get the height of the divs below the- and everything is a mess!
my aspx code:
<div class="tabcontent">
<div class="tabcontent-inner">
<div class="tabcontent-inner-left grid_20">
</div>
<div class="tabcontent-inner-right grid_20">
</div>
</div>
</div>
my stylesheet css:
.tabcontent-inner {
width: inherit;
padding: 10px 10px 10px;
margin-top: 10px;
margin-bottom: 1px;
position: relative;
display: block;
}
.tabcontent-inner-left {
padding: 20px 20px;
border-left: solid 1px #ddd;
width: 45%;
float: left
}
.tabcontent-inner-right{
padding: 20px 20px;
border-right: solid 1px #ddd;
width: 45%;
float: right
}
Basically, I want the tabcontent-inner div to get the height of what is inside of it.

this is because on parent .tabcontent-inner you need to put overflow:auto property so that it will cover ups its children's height
you can find more suitable answer here How do you keep parents of floated elements from collapsing?

Add this code to Your CSS
.clearfix:after {
content: " "; /* Older browser do not support empty content */
visibility: hidden;
display: block;
height: 0;
clear: both;
}
and
change
<div class="tabcontent-inner">
to
<div class="tabcontent-inner clearfix">
Semi colons are missing in the css after
float : left
and
float : right

How do I center text on a web form?

This is what I have and it is not being centered. It's all the way to the left for some reason.
<div>
<asp:Label ID="eagleReplicationManagerLabel" runat="server" CssClass="eagleReplicationManagerLabel">
Eagle Replication Manager
</asp:Label>
</div>
css for it:
.eagleReplicationManagerLabel
{
position: fixed;
font-size: 30px;
color: #0000FF;
text-align: center;
}

It is actually working but you couldn't see the result because it is rendered as a span which takes the exact width of its content. So the text didn't have enough space to adjust.
Increasing the width in your css style will show you why
.eagleReplicationManagerLabel
{
position: fixed;
font-size: 30px;
color: #0000FF;
text-align: center;
width:500px;
}

The text-align: center; needs to be on the <div> that contains the label.

the text is centered but is is an inline element so it is only as wide as the text inside.
That is why you can't tell that it is centered.
Give it some width or make it block and you will see the centering.
.eagleReplicationManagerLabel
{
position: fixed;
font-size: 30px;
color: #0000FF;
text-align: center;
display:block
}

The problem here is that asp:Label is rendered as a span on html and span elements are, by default, styled with display:inline; as a result, your CSS class does nothing.
If you want to center the text in the DIV, set the text-align:center on the DIV or set display:block on .eagleReplicationManagerLabel
.eagleReplicationManagerLabel
{
position: fixed;
font-size: 30px;
color: #0000FF;
text-align: center;
display:block;
}

.center{
width:200px;
margin:auto;
}
.eagleReplicationManagerLabel
{
position: fixed;
font-size: 30px;
color: #0000FF;
text-align: center;
}
<div>
<div class="center">
<asp:Label Text="Eagle Replication Manager" ID="eagleReplicationManagerLabel1" runat="server" CssClass="eagleReplicationManagerLabel"></asp:Label>
</div>
</div>