How to refer main domain directory from sub domain wed address
Question
Consider my domain is www.example.com
I if use path like /images/sample.jpg in php/html file, it actually refers to www.example.com/images/sample.jpg
Similarly if I do the same for www.subdomain.example.com
/images/sample.jpg --> it refers to www. subdomain .example.com/images/sample.jpg
but i want to refer the image from main domain without giving full web address in sub domain web page.
My main domain files are ketp at : root/www/
My subdomain files are kept in : root/public_html/admin/
I may change the web address later.. so I don't want to hard code the full web address in my code.
4 answers
solution1
1 2013-09-24 18:18:38
Do you just want to use html? If you use JavaScript you could programatically create the subdomain. What's the reason for you not wanting to specify the full web address?
Edit:
One way you could do it is by using javascript.
If you set a variable for the domain at the beginning of the text:
<html>
<head>
<script>
var webaddr = "www.example.com";
</script>
</head>
Then use this code when you want to write an actual link:
<body>
<img src="<script>document.write(webaddr)</script>/images/sample.jpg">
</body>
</html>
Then you can change the domain in the variable when you move the domain. Would that work?
solution2
1 2013-09-24 18:47:19
If you can use PHP or ASP you can use a variable (or constant) as a placeholder for the host name you want to use. Set that variable in a global configuration file so that it's accessible everywhere.
Here is a PHP example using a constant:
<?php
define( 'HOST', 'www.example.com' );
?>
Then use it like this:
<img src="<?php echo HOST ;?>/images/sample.jpg">
Then you can change your preferred host name whenever you want and all you have to do is update the constant.
solution3
1 2013-09-24 19:15:27
This code will detect the URL and add a specified subdomain:
<script>
var subdomain = "subdomain"; //change this variable to match your subdomain
var webaddr = (document.URL); //This gets the current URL
var newURL = (webaddr.substring(0, 7) + (subdomain) + "." + (webaddr.substring(7))); //This creates the new URL with the subdomain added
</script>
Old link:
<a href="<script>document.write(webaddr)</script>/images/sample.jpg">"<script>document.write(webaddr)</script>/images/sample.jpg"</a>
<br>
New link:
<a href="<script>document.write(newURL)</script>/images/sample.jpg">"<script>document.write(newURL)</script>/images/sample.jpg"</a>
solution4
0 2013-09-24 18:30:55
Looks like you are wanting something like what apache mod_rewrite does, which is to redirect one type of url to another
for instance when you provide like
/maindomain/images/someimage.jpg
which would be seen as
www.subdomain.example.com/maindomain/images/someimage.jpg
have it redirected to
www.example.com/images/someimage.jpg
Micronovae seems to have a mod called mod_rewrite that looks to work like apache mod_rewrite
and then you could use something like below on your www.subdomain.example.com site
RewriteRule ^/maindomain/images/(.*)$ http://www\.example\.com/images/$1 [R=301,L]
The Micronovae mod you have to buy though, you could try using http://www.iis.net/downloads/microsoft/url-rewrite but it may have a different syntax for doing the rewrites
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