How to use JavaScript to quickly create a common type of navigation component: Sidebar

This article tags : JavaScript tips javascript javascript functions JavaScript processing sidebar javascript navigation components

Sidebar is a common type of navigation component that pops up from the page flanking to cover the normal content.

Let's say your normal content is:

    <div id="main">         Placeholder<p>         Placeholder<p> Placeholder<p> </div>

Now we can add sidebarto the content. It has links to home and about. and add a button, you can open sidebar, the code is as follows:

    <divId="Mysidenav"class="Sidebar" ><ahref="Javascript:void (0)"class="Closebtn"onclick="Closenav ()" >&times;</a><ahref="#a" >home</a><ahref="#b" >about</a></div><buttononclick="Opennav ()" >open Sidebar</button><p><divId="Main" > Placeholder<p> Placeholder<p> Placeholder<p></div><style>. Sidebar {Height100%;Width0;position:fixed;Z-index:1;Top0;Left0;Background-color:#111;Overflow-x: Hidden;Padding-top:60px;Transition0.5s; }. SidebarAPadding4px4px4px32px;Text-decoration:none;Color#818181;Display:block;Transition0.3s}. Sidebara:hover{ color: #f1f1f1;}. Sidebar. closebtn { position:absolute; top: 10px; Right : 10px;} </style> <script> function opennav () { document.getElementById ("Mysidenav" ). Style.width = "150px";} function Closenav () { document.getElementById ("Mysidenav"). Style.width = "0";} </script>                

The point is:

2. By default, sidebar is a div built into any HTML, and width is 0, so it is not visible

4. When you need to use sidebar, you can use a function to set its width to a wide, so it becomes visible

5. Although it becomes visible, but because Z-index is 1, it does not cause the primary content to be re-rendered and the new location to be computed, but to overwrite the

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   This article tags : JavaScript tips javascript javascript functions JavaScript processing sidebar javascript navigation components

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How to use JavaScript to quickly create a common type of navigation component: Sidebar