How to include a shared page in an html page_javascript tips
How do I include one HTML file inside another?
It's very common practice to have a consistent theme on a web site. You might have a standard navigation bar or a logo or even just a page footer with copyright and administrative information. Rather than actually having that information on each and every page it would certainly be nice if you could write your navigation bar once, keep it in one file, and then reference that file in each of several different pages. Make a change to the navigation bar in one place and instantly all pages are updated.
Welcome to "include" files - an incredibly powerful facility that can do this, and so much more, on your web site.
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Includes break down into two categories: client and server. A "client" side include is one performed by your browser. Unfortunately, there is no specific syntax in HTML for client side includes so we have to play a small game using javascript. A "server" side include is exactly that - the include happens on your web server so the client browser never even knows it happened.
Server Side Includes
We'll start with the conceptually easier one: the server side include. The specific syntax will vary based on what type of server you have and what your pages are written in.
Simple HTML pages on most common web servers can use a syntax called Server Side Include, or SSI. As an example in an HTML file a.html we can place this line:
The page seen by a browser viewing a.html will consist of the contents of a.html before the include line, followed by the contents of b.inc, followed by the contents of a.html after the include line. Put the HTML for your navigation bar in a file like b.inc, and all your pages can show the exact same bar.
SSI is available on both Apache and Microsoft IIS web servers. On Apache some configuration may be needed but even if you don't have access to the actual server configuration files it can typically also be enabled by commands in a file named .htaccess that you will either find or can create in your server's web directory. Read more about Apache SSI here. Under IIS, SSI is enabled anytime you use ".asp" pages -- so the only configuration you need do is to name your pages .asp instead of .html. Read more about Server Side Include in ASP pages here.
Another popular ASP-like programming environment is PHP. PHP's include syntax is very simple:
readfile("b.inc"); ?>
Naturally, PHP has a host of additional processing ability but much like ASP the only requirement to make the include above work is to have PHP on your web server and name your file ".php".
With all of the above approaches, the browser viewing the page knows absolutely nothing about the include - it all happened before the page was downloaded. However, sometimes processing an include on the server isn't the right option. That's where processing an include on the client comes in.
Client Side Includes
As I mentioned above, there is no actual syntax for a client-side include but we can mimic one using Javascript. For example:
When encountered the browser downloads the script "b.js", executes it, and prints any output that the script might generate as if it were inline HTML. Technically that's not an include but the script "b.js" could be nothing more than a series of javascript "print" statements such as these:

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