Multi category Website: JavaScripts

The Javascript

function goToThere(opt){

var path = opt.options[opt.selectedIndex].value;
var url = window.location;
var protocol = url.protocol;
var domain = url.host;
var old_path = url.pathname;

if(path != "default" && path != "" && path != old_path){
if(path.indexOf("http://") != -1 || path.indexOf("https://") != -1)
window.location.href = path;
else
window.location.href = protocol+"//"+domain+"/"+path;
}
}

Let’s go through the code. First, we are passing an attribute opt, which in our HTML we will send the select object. Now we need to set some variables, most of which are only used to rebuild the URL if you pass the function a relative path:

path — This simply gets the text that we store in a value attribute for the selected option. This can be a relative link (/category/tutorials/) or external (http://superprofundo.com/category/tutorials/).
url — this just stores the window.location object in a variable for easy access, which we’ll use to grab different parts of the URL.
protocol — As described above, this would be equivalent to window.location.protocol, which specifies the protocol of the current URL – e.g. http: or https:
domain — this will grab the host name of the site, e.g www.superprofundo.com
old_path — this contains the path name of the current URL (for “site.com/index.html,” the pathname is “/index.html”).

Next, our conditional statement is checking that…
path != “default” … the path is not the default option
path ! = “” … the path is not empty
path ! = old_path … the path is not equal to the page we are currently on.

If all of these conditions are true, we can set up the redirect. The next conditional statement uses indexOf to search for an occurrence of “http://” or “https://” in the path. This function returns the position of the first occurrence of what we’re searching for in a string; it will return -1 if it can’t find it. So, if indexOf returns something other than -1 when searching for either http:// or https:// in path, we can assume that pathis a full URL. If this is the case, use window.location.href to redirect the browser window to the URL specified in path. If path isn’t a full URL, we build the redirect URL using the information we culled from window.location.

The HTML

<option value="default" selected="true">---Choose Destination---</option>

<option value="/categories/tutorials">Tutorials</option>

<option value="http://www.superprofundo.com/categories/editorials/">Editorials</option>

</select>

This part is simple. We make a drop down that runs our Javascript function, goToThere, when the onChange event is activated (which would be when a user changes the selected option). The value attribute in each option specifies the path or URL to which the function will ultimately redirect (except for the default selected option). Now we just need to define our Javascript function in the header.

That’s all you need for a versatile drop down link selector in JavaScript. Of course, feel free to use and modify this example. What better way to learn?

This example

Have you ever worked really hard on graphics for your site only to find later that someone has stolen them as their own. You can help encrypt and protect your site with the following HTML codes. No right click block is 100% effective, but they will help against novices.

Use the script below so when someone right clicks to save an image off your page, a message will come up letting people know that your information is copyrighted.

This script may not work in all browsers, and is not foolproof. If someone really wants something from your page they can find ways around it, but at least it's a warning to people who want to take your graphics. But it certainly is a great start.

Copy and paste the following code, and make sure it comes right after your <HEAD> tag:

<script language=JavaScript> var message="Function Disabled!"; function clickIE4(){ if (event.button==2){ alert(message); return false; } } function clickNS4(e){ if (document.layers||document.getElementById&&!document.all){ if (e.which==2||e.which==3){ alert(message); return false; } } } if (document.layers){ document.captureEvents(Event.MOUSEDOWN); document.onmousedown=clickNS4; } else if (document.all&&!document.getElementById){ document.onmousedown=clickIE4; } document.oncontextmenu=new Function("alert(message);return false") </script>

If you don't like using javascript, you can always use a span tag to position a transparent gif over the top of the image like the example code below. Don't forget, you will need to create a transparent.gif to implement this method.

<span style="background-image: url(images/my_image.jpg)"><img src="images/transparent.gif" width="200" height="150" border="0" alt="Protected Image."></span>

"NO RIGHT CLICK" for Source

Here is a handy little script which will not only protect your images from right clicking, but your whole page. Remember this only stops some visitors from viewing your source. There are ways around it and if someone really wants to view your source they may find a way. There is another trick below to protect your source code, so keep reading.

<script language=JavaScript> var message="Function Disabled!"; function clickIE4(){ if (event.button==2){ alert(message); return false; } } function clickNS4(e){ if (document.layers||document.getElementById&&!document.all){ if (e.which==2||e.which==3){ alert(message); return false; } } } if (document.layers){ document.captureEvents(Event.MOUSEDOWN); document.onmousedown=clickNS4; } else if (document.all&&!document.getElementById){ document.onmousedown=clickIE4; } document.oncontextmenu=new Function("alert(message);return false") </script>

Disable Copy and Paste for greater website security.

One of the most popular questions I recieve here at Hypergurl is "How do you stop visitors from stealing your webpage information?"

Below is a little trick that will stop your visitors from copying and pasting your webpage information. Anyone with experience may know a way around this trick. However it will make it hard enough to discourage them and get them moving on to easier targets.

Add the following html code to your BODY tag:
Here is how your BODY tag may look once implimented: <body bgcolor="#FFFFFF" ondragstart="return false" onselectstart="return false">

ondragstart="return false" onselectstart="return false"

Make Your Source Code Vanish.

Now before I show you this last trick to protect your source, I would like you to first view my source. Just click "View" then choose "Source"

How did I do that?

Place your cursor in front of the opening <html> tag and hit your enter button for a while. It will push your source code out of view and this will fool the fools. *smiles*

Easy Javascript Drop Down Link Selection

The Javascript

Secure your website with JavaScript, NO RIGHT CLICK for Images

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