Javascript in external file ~ v code java script

Javascript can placed in external files. Of course JavaScript can be added to HTML files too, but in some situations it is better to include Javascript in external files. In this article you will find why to include Javascript in external files, how to put JavaScript in external file, one simple example and instructions for blogger users to use external Javascript.

Why people place Javascript in external files

to use the same Javascript on many pages and don't want to rewrite Javascript code on every page, it is simpler to have one Javascript function code in one place (one .js file) then in many HTML files

to get more organized and easiest to maintain code

HTML page is smaller in size, making it load faster

separates the JavaScript from the HTML to get better Search Engine Optimization (SEO), Javascript will not get higher PageRank

they are forced to move js off the page (for example blogger users have problem to use javascript in blogger editor, or some similar restrictions)

How to add Javascript in external file

First, you must make .js file. File must have extension .js

write Javascript function (or functions) in file and save file

Sample TestJs.js
```
function Hello()
{
    alert("Hello");
}
```

now we can make a call to javascript function from HTML file, let's assume that the .js file is in the same directory as the HTML file in which we are going to call javascript function

Sample HTML file : TestCall.html
```
<html>
<head>
<script src="TestJs.js" type="text/javascript">
</script>
</head>
<body>
<input type="button" onclick="Hello()" value="Hello!">
</body>
</html>
```

that is it, if those two file are in same directory when user click on Hello button javascript Hello function (which is in js file) will be called from HTML file and will be executed

External Javascript in blogger post

Demonstration:

To use javascript inside blogger post you have follow next steps:

save javascript function in js file (like described in previous chapter)

Sample TestJs.js
```
function Hello()
{
    alert("Hello");
}
```

on blogspot (blogger) there is no option to upload js file (or file of any other type) so you need to find where to upload javascript file

you can find instructions how to upload javascript file by following this link, take a look at Google Groups chapter

in blogger post add code to use remote javascript

Use this:

<script src="[URL OF AN EXTERNAL SCRIPT]" type="text/javascript"></script>

Example for uploaded javascript file on Google Groups:

<script src="http://everything-about-blogging.googlegroups.com/web/TestJs.js?hl=en&gda=bUe-djsAAAATLYFRxG7MFqGWBWh2VvtrqIEbF7jzfKsOTBbDD3S6g8oRXZrtFiBTuJ69H91AzQAGRdr3QrylPkw2aRbXD_gF&gsc=CJY8-AsAAABni9lzDVHuoDw_bqXODZJz" type="text/javascript"></script>

add code in blogger post that call JavaScript function

<input type="button" onclick="Hello()" value="Hello!">

now you have blogger post which call javascript function from external file

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