Layout Resizer 
A pure javascript Layout Resizer to be resize sidebar, menubar, panel etc. host Libarary.
How to build Layout Resizer
Clone a copy of the main Layout Resizer git repo by running:
git clone git://github.com/jqrony/layout-resizer.gitIn the layout-resizer/lib folder you will find build version of sizzle along with the minified copy and associated map file.
npm install
# install locally (recomended)
npm install layout-resizer --savePublic API
new layoutResizer(
DOMElement layout, // Resizable layout
DOMElement sash, // Resizer
String dir, // left, right, top, bottom
Boolean overrideCursor // true/false
);
Notice Don't implement minified file Because this version 1.0.3 minified file in may be bugs
create style.css file or internal implement in html
html, body, .layout {
height: 100%;
width: 100%;
}
* {
padding: 0;
margin: 0;
font-family: 'Segoe UI', Tahoma, sans-serif;
}
.sidebar {
justify-content: center;
align-items: center;
height: 100%;
width: 222px;
display: flex;
position: absolute;
background-color: #f1f0f0;
}
.sash {
height: 100%;
width: 4px;
right: 0;
position: absolute;
}
.sash {
background-color: #8a2de0;
}Create index.html file
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Layout Resizer</title>
<!-- Implement CDN Link -->
<script src="https://cdn.jsdelivr.net/npm/layout-resizer/lib/layout-resizer.js"></script>
<link rel="stylesheet" href="style.css">
<script src="index.js" defer></script>
</head>
<body>
<div class="layout">
<div class="sidebar">
<div class="sash"></div>
<strong>Primary Sidebar</strong>
</div>
</div>
</body>
</html>Create index.js or implement internally
const sash = document.querySelector(".sash");
const sidebar = document.querySelector(".sidebar");
new layoutResizer(sidebar, sash, "right");