Top 14 JavaScript Sample Snippets for Your Websites

Top 14 JavaScript Sample Snippets for Your Websites

Now, let's get down to the stuffs that you came here for – below is a list of 14 JavaScript snippets that will enhance your site in either functionality or appearance.

JavaScript is used everywhere online these days – to improve website interactivity, to validate information, and/or to improve a website outlooks.

JavaScript first appeared and has come a long way since then in terms of being accepted and how it is used. The syntax used in JavaScript was strongly influenced by C; but Java, Pearl, Python, and Scheme also played its part too.

It is also important to understand that JavaScript will actually lead to disaster when it's used in a wrong way.

Poorly configured and sloppy coded JavaScripts will slow your website and damage the overall site navigation. This in turn affect the return rate of your visitors (due to bad user experience) as well as search engine rankings (due to slow website response rates and bot crawling).  To help validate my case here, put yourself in the shoes of a viewer. If a website you were visiting loaded slowly, was difficult to navigate, and in overall, unappealing – would you return to the site? I wouldn’t.

Below is a small list of things to think about when adding JavaScript to your website.

  • Is JavaScript required for the site to function properly?
  • What will the site look like if the JavaScript was blocked?
  • Will the JavaScript harm the server performance?
  • Will adding the JavaScript help move your site in the direction you want it to go?

No, I am not trying to scare you away with these points.

In fact, don’t be afraid to use JavaScript on your websites as it provides tons benefits and, as mentioned, it's used by the majorities. The key point I am trying to get across here is don’t just keep adding JavaScript features to a site when they are unnecessary. Some sites are will need more JavaScript than the rest; some just need less – Just because one site is doing it doesn't mean you should do the same.

Freebies: 14 Cool JavaScript Snippets For Your Website

Now, let's get down to the stuffs that you came here for – below is a list of 14 JavaScript snippets that will enhance your site in either functionality or appearance. The code will be broken down into two sections, the head and body or .js file. If no section title is given then it is not needed for that particular snippet.

1. Show Formatted Date

Quick Sample

Head:

<script type="text/javascript">
  function showDate() {
    var d = new Date();
    var curr_date = d.getDate();
    var curr_month = d.getMonth() + 1; //months are zero based
    var curr_year = d.getFullYear();
    document.write(curr_date + "-" + curr_month + "-" + curr_year);
  }
</script>

Body:

<script type="text/javascript">showDate();</script>

What does the JavaScript snippet do?

This snippet will allow you to display the current date anywhere on your webpage and does not need to be updated. Simply put it in place and forget about it.

2. Detect iPhones

Sample

<script type="text/javascript">

if((navigator.userAgent.match(/iPhone/i)) || (navigator.userAgent.match(/iPod/i))) {

    if (document.cookie.indexOf("iphone_redirect=false") == -1) {

        window.location = "http://m.espn.go.com/wireless/?iphone&i=COMR";

    }

}

</script>

What does the JavaScript snippet do?

This snippet will allow you to detect if your viewer is on an iPhone or iPod allowing you to display different content to them. This snippet is invaluable with how large the mobile market is and it is only going to continue to grow.

3. E-mail Validation

Quick Sample

Head:

<script type="text/javascript">
function validateEmail(theForm) {
if (/^w+([.-]?w+)*@w+([.-]?w+)*(.w{2,3})+$/.test(theForm.email-id.value)){
return(true);
}
alert("Invalid e-mail address! Please enter again carefully!.");
return(false);
}
</script>

Body:

<form onSubmit="return validateEmail(this);" action="">
E-mail Address:
<input type="text" name="emailid" />
<input type="submit" value="Submit" />
<input type="reset" value="Reset" />
</form>

What does the JavaScript snippet do?

This snippet will validate that a properly formatted e-mail address is entered in a form, it cannot guarantee that the e-mail address is real, there is no way to check for that with JavaScript.

4. Understanding HTML5 Video

Quick Sample

<script type="text/javascript">

function understands_video() {
return !!document.createElement('video').canPlayType; // boolean
}

if ( !understands_video() ) {
// Must be older browser or IE.
// Maybe do something like hide custom
// HTML5 controls. Or whatever...
videoControls.style.display = 'none';
}

</script>

What does the JavaScript snippet do?

This little snippet will prevent your website from trying to display a video that the browser cannot support, saving you bandwidth and processing power.

5. Preload your images

Quick Sample

<script type="text/javascript">

var images = new Array();

function preloadImages(){

    for (i=0; i < preloadImages.arguments.length; i++){

         images[i] = new Image();

        images[i].src = preloadImages.arguments[i];

    }

}

preloadImages("logo.jpg", "main_bg.jpg", "body_bg.jpg", "header_bg.jpg");

</script>

What does the JavaScript snippet do?

This snippet will prevent your site from having that awkward time when it is only displaying part of the site; this not only looks bad but is also unprofessional. All you have to do is add your images to the preloadImages section and you are ready to roll.

6. No Right-Click

Quick Sample

<script type="text/javascript">
function f1() {
  if(document.all) { return false; }
}
function f2(e) {
  if(document.layers || (document.getElementById &! document.all)) {
    if(e.which==2 || e.which==3) { return false; }
  }
}
if(document.layers) {
  document.captureEvents(Event.MOUSEDOWN);
  document.onmousedown = f1;
}
else {
  document.onmouseup = f2;
  document.oncontextmenu = f1;
}
document.oncontextmenu = new function("return false");
</script>

What does the JavaScript snippet do?

This snippet will prevent the viewer from being able to right-click on your page. This can discourage the average user from borrow images or code from your site.

7. Display Random Quotes

Quick Sample

Head:

<script type="text/javascript">
  writeRandomQuote = function () {
    var quotes = new Array();
    quotes[0] = "Action is the real measure of intelligence.";
    quotes[1] = "Baseball has the great advantage over cricket of being sooner ended.";
    quotes[2] = "Every goal, every action, every thought, every feeling one experiences, whether it be consciously or unconsciously known, is an attempt to increase one's level of peace of mind.";
    quotes[3] = "A good head and a good heart are always a formidable combination.";
    var rand = Math.floor(Math.random()*quotes.length);
    document.write(quotes[rand]);
  }
  writeRandomQuote();
</script>

Body:

<script type="text/javascript">writeRandomQuote();</script>

What does the JavaScript snippet do?

Ok so this is not a snippet that all sites would use but it can be used to display more than just random quotes. You can change the content ok the quotes to whatever you want and have random images or text displayed anywhere on your site.

Quick Sample

<a href="javascript:history.back(1)">Previous Page</a> | <a href="javascript:history.back(-1)">Next Page</a>

What does the JavaScript snippet do?

This snippet is great if you have multiple pages on an article or tutorial. It will allow the user the browse between the pages with ease. It is also small and light weight from a resource point of view.

9. Bookmark a Page

Quick Sample

<a href="javascript:window.external.AddFavorite('http://www.yoursite.com', 'Your Site Name')">Add to Favorites</a>

What does the JavaScript snippet do?

This snippet will allow the user to bookmark your page with ease; all they have to do is click the link. Its little features like this that can increase your viewers overall experience.

Quick Sample

<a href="javascript:window.print();">Print Page</a>

What does the JavaScript snippet do?

This little link will allow your views to easily print your page. It utilizes the quick print feature already setup by your browser and utilizes no resources until it is clicked.

11. Comma Separator

Quick Sample

Head:

<script type="text/javascript">
function addCommas(num) {
  num += '';
  var n1 = num.split('.');
  var n2 = n1[0];
  var n3 = n1.length > 1 ? '.' + n1[1] : '';
  var temp = /(d+)(d{3})/;
  while (temp.test(n2)) {
    n2 = n2.replace(temp, '' + ',' + '');
  }
  var out = return n2 + n3;
  document.write(out);
}
</script>

Body:

<script type="text/javascript">addCommas("4550989023");</script>

What does the JavaScript snippet do?

This snippet would be used mainly by sites that use numbers often. This snippet will keep your numbers looking the same across the board. All you have to do is copy the body line where you want to add a number and replace the number there with your number.

12. Get the Display Area of a Browser

Quick Sample

<script type="text/javascript">

<!--

var viewportwidth;

var viewportheight;

// the more standards compliant browsers (mozilla/netscape/opera/IE7) use window.innerWidth and window.innerHeight

if (typeof window.innerWidth != 'undefined')

{

      viewportwidth = window.innerWidth,

      viewportheight = window.innerHeight

}

// IE6 in standards compliant mode (i.e. with a valid doctype as the first line in the document)

else if (typeof document.documentElement != 'undefined'

     && typeof document.documentElement.clientWidth !=

     'undefined' && document.documentElement.clientWidth != 0)

{

       viewportwidth = document.documentElement.clientWidth,

       viewportheight = document.documentElement.clientHeight

}

// older versions of IE

else

{

       viewportwidth = document.getElementsByTagName('body')[0].clientWidth,

       viewportheight = document.getElementsByTagName('body')[0].clientHeight

}

document.write('<p>Your viewport width is '+viewportwidth+'x'+viewportheight+'</p>');

//-->

</script>

What does the JavaScript snippet do?

This snippet will allow you to get the width and height of the display area in your views browser. This will give the designer the ability to create and use different displays based on the size of the user’s browser window.

13. Redirect with Optional Delay

Quick Sample

<script type="text/javascript">

setTimeout( "window.location.href =

'http://walkerwines.com.au/'", 5*1000 );

</script>

What does the JavaScript snippet do?

This snippet will allow you to redirect your viewers to another page and it has the option of setting a delay. The use of this snippet is pretty self-explanatory and it is a very valuable tool to have in your belt.

14. Print Message to Status Bar

Quick Sample

<script language="javascript" type="text/javascript"> 
<!-- 
   window.status = "<TYPE YOUR MESSAGE>"; 
// --> 
</script>

What does the JavaScript snippet do?

This little snippet will allow you to print a message to the status bar. You can display recent or important news in an area the will catch the eye of the user.

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I hope this tutorial will surely help and you if you liked this tutorial, please consider sharing it with others.

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