The function presented in this page ( urlData() ) can be used to get /extract the domain name and other data from URL address.
The function receives a string with the URL address, and returns an object containing these data:
Protocol, Page Path, File-name, search parts, port, and hash part.

Code of the function (click to select it):
// Extract data from URL address
// Returns an object with parts of the URL address:
// protocol, domain-name, port, path, file-name, search-string, search-object, hash
function urlData(url){ // From: https://coursesweb.net/javascript/
  // object that will be returned
  var re = {protocol:'', domain:'', port:80, path:'', file:'', search_str:'', search_obj:{}, hash:''};

  // creates an anchor element, and adds the url in "href" attribute
  var a_elm  = document.createElement('a');
  a_elm.href = url;

  // adds URL data in re object, and returns it
  re.protocol = a_elm.protocol.replace(':', '');
  re.domain = a_elm.hostname.replace('www.', '');
  if(a_elm.port !='') re.port = a_elm.port;
  re.path = a_elm.pathname;
  if(a_elm.pathname.match(/[^\/]+[\.][a-z0-9]+$/i) != null) re.file = a_elm.pathname.match(/[^\/]+[\.][a-z0-9]+$/i)[0];
  re.search_str = a_elm.search.replace('?', '');

  //get search-data into an object {name:value}, in case there are multiple pairs name=value
  var src_data = re.search_str.split('&');
  for(var i=0; i<src_data.length; i++){
    var ar_val = src_data[i].split('=');   //separate name and value from each pair
    re.search_obj[ar_val[0]] = ar_val[1];
  }

  re.hash = a_elm.hash.replace('#', '');  //get #hash part
  return re;
}
Example:
<div id="urld">Here it is added URL data.</div>
<script>
// Extract data from URL address
// Returns an object with parts of the URL address:
// protocol, domain-name, port, path, file-name, search-string, search-object, hash
function urlData(url){ // From: https://coursesweb.net/javascript/
  // object that will be returned
  var re = {protocol:'', domain:'', port:80, path:'', file:'', search_str:'', search_obj:{}, hash:''};

  // creates an anchor element, and adds the url in "href" attribute
  var a_elm  = document.createElement('a');
  a_elm.href = url;

  // adds URL data in re object, and returns it
  re.protocol = a_elm.protocol.replace(':', '');
  re.domain = a_elm.hostname.replace('www.', '');
  if(a_elm.port !='') re.port = a_elm.port;
  re.path = a_elm.pathname;
  if(a_elm.pathname.match(/[^\/]+[\.][a-z0-9]+$/i) != null) re.file = a_elm.pathname.match(/[^\/]+[\.][a-z0-9]+$/i)[0];
  re.search_str = a_elm.search.replace('?', '');

  //get search-data into an object {name:value}, in case there are multiple pairs name=value
  var src_data = re.search_str.split('&');
  for(var i=0; i<src_data.length; i++){
    var ar_val = src_data[i].split('=');   //separate name and value from each pair
    re.search_obj[ar_val[0]] = ar_val[1];
  }

  re.hash = a_elm.hash.replace('#', '');  //get #hash part
  return re;
}

// Test
var url = 'https://coursesweb.net:80/javascript/index.php?pg=tutorial&id=89#hash_part';
var url_data = urlData(url);

// displays URL data in #urld
document.getElementById('urld').innerHTML = 'protocol : '+ url_data.protocol +'<br>domain : '+ url_data.domain +'<br>port : '+ url_data.port +'<br>path : '+ url_data.path +'<br>file : '+ url_data.file +'<br>search_str : '+ url_data.search_str +'<br>search_obj : '+ JSON.stringify(url_data.search_obj) +'<br>hash : '+ url_data.hash;
</script>
Result:
protocol : http
domain : coursesweb.net
port : 80
path : /javascript/index.php
file : index.php
search_str : pg=tutorial&id=89
search_obj : {"pg":"tutorial", "id":"89"}
hash : hash_part

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute is used in <a> tag for the address of the link?
src href rel
<a href="http://coursesweb.net/" title="CoursesWeb.net">CoursesWeb.net</a>
Which CSS property sets the type of the text font?
font-family text-decoration font-size
h2 {
  font-family:"Calibri",sans-serif;
}
What instruction selects all the <div> tags with class="cls"?
querySelector("div.cls") getElementsByTagName("div") querySelectorAll("div.cls")
var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length;       // number of selected items
alert(nr_elms);
Indicate the function that can be used to get the sum of values in an array.
array_sum() array_diff() array_shift()
$arr =[1, 2, 3, 4);
$arr_sum = array_sum($arr);
echo $arr_sum;       // 10
Get Domain Name and other Data from URL

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