JavaScript gets the absolute path method for the current directory

When it comes to path-related issues, everyone will go to the window.location and think that this object provides quite a lot of path information, which is commonly used to include:

Location.href: Full URL of the current page
Location.pathname: path name in current URL
Location.hash: Anchor points in the current URL
Location.search: Query parameters in the current URL

However, location does not have an attribute that directly obtains the absolute path of the current directory (without the filename). Through Google I found some wrong ways, such as the URL through "/" separated by the number of groups, the last item of the array is removed and then connected to a string. However, if a filename is not specified in the URL, the result is wrong.

Based on previous coding experience, the href attribute of a element always returns an absolute path, which means it has the ability to turn a relative path into an absolute path. Try it with the following code:

var a = document.createelement (' a ');

A.href = './';

alert (a.href);

A = null;

Unfortunately, this method is not valid under old IE 6/7, and when executing alert (A.HREF), the pop-up is still "./". Later, I found that some people in the StackOverflow also raised the problem, and the solution is very simple, as long as a through innerHTML injection can be:

var div = document.createelement (' div ');

div.innerhtml = ' <a href= './"></a>";

alert (div.firstChild.href);

div = null;

One might ask: why not use regular expressions? My answer is: to consider whether there is a file name, there is no anchor point, there is no query parameters, this regular expression may be quite complex.

Example

function Getrealpath () {//Get current URL, such as: http://localhost:8083/myproj/view/my.jsp var curwwwpath=window.document.loc 
     Ation.href; 
    Gets the directory after the host address, such as: myproj/view/my.jsp var pathname=window.document.location.pathname; 
    var pos=curwwwpath.indexof (pathName); 
    Get the host address, such as: http://localhost:8083 var localhostpaht=curwwwpath.substring (0,pos); 
  
　　 Get the project name with "/", such as:/myproj var projectname=pathname.substring (0,pathname.substr (1). IndexOf ('/') +1); 
    http://localhost:8083/myproj var realpath=localhostpaht+projectname was obtained; 
  alert (Realpath); }

Example

Here's how JavaScript gets the path to the file:

function Servermappath (fileName) {

var syspath = location.href;

Syspath = Syspath.tolowercase ();  Change the path name to lowercase

myposition = syspath.lastindexof ("/"); Gets the last "/"

Syspath = syspath.substring (0,parseint (myposition) +1) in the file path;//the String before "/" is intercepted using the SUBSTRING function,   Gets the path to the current directory

Syspath = Syspath.replace ("
file:///
", "");   Here to
replace the file:///
is empty, otherwise it will be an error

Syspath = syspath.replace (New RegExp ("%20", "GM"), ""); If the file name contains spaces, then to restore the space, replace all%20 as ""

Syspath = syspath + filename;

return syspath.tostring ();

}