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Get specific part from url origin with JS

I have to extract a specific part from an url origin. But I can't seem to figure out a good and fail proof way to do this
For example, this is my url:
http://site.domain.com
I need to know what "domain" is used. How do I get this part from the url 100% of the time?
My first thought was to split it between the "." but then I thought about what could happen if someone uses a http://www.site.domain.com link. That would mean it wouldn't work.
Further explanation:
I currently have 2 website which both have a differend domain name. I have to get the information about which page is loaded, based on the "domain" name in the url.
Thanks in regard!

split the full domain name on dot and than take element before last element.
var url = 'http://www.site.domain.com';
var array = url.split(".");
var lengthOfArray = array.length;
var domain = array[lengthOfArray-2];
console.log(domain);

Split by / using split("/"):
function getDomain(url){
var arr = url.split(".");
return arr[arr.length - 2];
}
console.log(getDomain('http://site.domain.com'));
console.log(getDomain('http://www.site.domain.com'));

You could split it by "." and get the next to last text of your string.
var str = 'http://www.site.domain.com';
var domain = str.split('.');
console.log(domain[domain.length-2]);
Later Edit
To provide further fail proof, you can get the latest text between .com and the first dot before it. This will work in case you have another dot in your URL, for example: 'http://www.site.domain.com/post/test.asp'.
var str = 'http://www.site.domain.com/post/test.asp';
var preComLink = str.substr(0, str.indexOf('.com'));
var preDomainIndex = preComLink.lastIndexOf('.');
var domain = preComLink.substr(preDomainIndex + 1, str.indexOf('com'));
console.log(domain);

let code = (function(){
return{
getDomain: function(url){
var slpitDomainURL = url.split(".");
var lengthOfArray = slpitDomainURL.length;
var domain = slpitDomainURL[lengthOfArray-2];
return domain;
}
}
})();
console.log(code.getDomain('http://www.google.com'));
console.log(code.getDomain('http://www.facebook.com'));

How to remove `&` sign and all text after that from url

I have this URL
https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id1=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request
Here I am getting sys_id two times with different parameters. So I need to remove the second & sign and all text after that.
I tried this
location.href.split('&')[2]
I am sure it doesn't work. Can anyone provide some better solution?

Firstly, you should split the string into an array then use slice to set the starting index number of the element which is 2 in your case and then join the array again into the string.
Read more about these methods JavaScript String split() Method, jQuery slice() Method and JavaScript Array join() Method
var url = 'https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request';
url = url.split("&").slice(0,2).join("&");
console.log(url);

Maybe like this:
var url='https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request';
var first=url.indexOf('&');
var second=url.indexOf('&',first+1);
var new_url=url.substring(0,second);
console.log(new_url);

You need to find the 2nd occurrence of &sys_id. From there onwards remove all text.
Below is working code:
let url='https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request';
let str1=url.indexOf('&sys_id');
let str2=url.indexOf('&sys_id',str1+1);
console.log(url.substring(0,str2));

This is a bit more verbose, but it handles all duplicate query params regardless of their position in the URL.
function removeDuplicateQueryParams(url) {
var params = {};
var parsedParams = '';
var hash = url.split('#'); // account for hashes
var parts = hash[0].split('?');
var origin = parts[0];
var retURL;
// iterate over all query params
parts[1].split('&').forEach(function(param){
// Since Objects can only have one key of the same name, this will inherently
// filter out duplicates and keep only the latest value.
// The key is param[0] and value is param[1].
param = param.split('=');
params[param[0]] = param[1];
});
Object.keys(params).forEach(function(key, ndx){
parsedParams += (ndx === 0)
? '?' + key +'='+ params[key]
: '&' + key +'='+ params[key];
});
return origin + parsedParams + (hash[1] ? '#'+hash[1] : '');
}
console.log( removeDuplicateQueryParams('http://fake.com?q1=fu&bar=fu&q1=fu&q1=diff') );
console.log( removeDuplicateQueryParams('http://fake.com?q1=fu&bar=fu&q1=fu&q1=diff#withHash') );

var url = "https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id1=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request"
url = url.slice(0, url.indexOf('&', url.indexOf('&') + 1));
console.log(url);
Try this :)

Try this:
var yourUrl = "https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request"
var indexOfFirstAmpersand = yourUrl.search("&"); //find index of first &
var indexOfSecondAmpersand = indexOfFirstAmpersand + yourUrl.substring((indexOfFirstAmpersand + 1)).search("&") + 1; //get index of second &
var fixedUrl = yourUrl.substring(0, indexOfSecondAmpersand)
$(".answer").text(fixedUrl);
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p class="answer">
</p>

You can manipulate the url using String.prototype.substring method. In the example below I created a function that takes a url string and checks for a duplicate parameter - it returns a new string with the second occurrence removed.
var url = "https://myApp-ajj.com/sp?id=cat_item&sys_id=cf9f149cdbd25f00d080591e5e961920&sys_id=cf9f149cdbd25f00d080591e5e961920&sysp_Id=a691acd9dbdf1bc0e9619fb&sysparm_CloneTable=sc_request&sysparm_CloneTable=sc_request";
function stripDuplicateUrlParameter(url, parameterName) {
//get the start index of the repeat occurrance
var repeatIdx = url.lastIndexOf('sys_id');
var prefix = url.substring(0, repeatIdx);
var suffix = url.substring(repeatIdx);
//remove the duplicate part from the string
suffix = suffix.substring(suffix.indexOf('&') + 1);
return prefix + suffix;
}
console.log(stripDuplicateUrlParameter(url));
This solves your specific problem, but wouldn't work if the parameter occurred more than twice or if the second occurrence of the string wasn't immediately following the first - you would probably write something more sophisticated.
As someone already asked - why is the url parameter being duplicated in the string anyway? Is there some way to fix that? (because the question asked seems to me to be a band-aid solution with this being the root issue).

Get name of image using split

I'm stuck, trying to get the name of image after uploaded it.
C:\work\assets\pic_items\06c1dd6b-5173-47b6-be09-f5c76866996d.PNG
I always get this result all I want is just the last 06c1dd6b-5173-47b6-be09-f5c76866996d.PNG
I use .split but it doesn't seems to work
picture_path = uploadedFiles[0].fd.z[z.length-1].split('.');

Try this:
var filePath = 'C:\\work\\assets\\pic_items\\06c1dd6b-5173-47b6-be09-f5c76866996d.PNG';
var fileName = filePath.split('\\').pop();
console.log(fileName) // 06c1dd6b-5173-47b6-be09-f5c76866996d.PNG
This will break the path into parts and then use pop to grab the last entry in the array, which is the filename.

If you have C:\work\assets\pic_items\06c1dd6b-5173-47b6-be09-f5c76866996d.PNG and want 06c1dd6b-5173-47b6-be09-f5c76866996d.PNG, try:
var fileParts = filePath.split('\\');
filename = fileParts[fileParts.length - 1];

You'll have to escape the backslashes as they're escape characters themselves:
var str = 'C:\\work\\assets\\pic_items\\06c1dd6b-5173-47b6-be09-f5c76866996d.PNG';
var li = str.lastIndexOf('\\'); // last index of backslash
console.log(str.slice(li + 1)) // 06c1dd6b-5173-47b6-be09-f5c76866996d.PNG

How to slice long string and output a portion of text

I am capturing the user`s session data into a variable and come out as the following:
"192605238.|1=Identifiant=FSAPPS\BBF4U5C=1^2=Caisse=GTD95600=1^3=Editeur=False=1^5=Pvp=PVPTSP=1"
I am trying to figure out how to capture the data after FSAPPS\ and before the = so in this case I only want to output BBF4U5C. This would be the login name of the user and may vary in lenght.
Looking for any help at this point.

Try this:
var s = "192605238.|1=Identifiant=FSAPPS\BBF4U5C=1^2=Caisse=GTD95600=1^3=Editeur=False=1^5=Pvp=PVPTSP=1"
var res = s.split("FSAPPS")[1].split("=")[0];

Here is a hackish way based on finding the start and end indexes in the string. I'm not sure what parts are reliable and what parts aren't but this will work for your specific use case.
var str = "192605238.|1=Identifiant=FSAPPS\BBF4U5C=1^2=Caisse=GTD95600=1^3=Editeur=False=1^5=Pvp=PVPTSP=1";
var start = str.indexOf("FSAPPS") + 6;
var end = str.indexOf("=1^2");
alert(str.substring(start, end));//alerts BBF4U5C
http://jsfiddle.net/7ssyub7a/

Find index of identifier (index of first letter),
find index od "=" (start looking after identifier)
with this information + known length of identifier you can easily extract sub string containing your login, (bonus points for not destroying your original string)
var txt =
"192605238.|1=Identifiant=FSAPPS\BBF4U5C=1^2=Caisse=GTD95600=1^3=Editeur=False=1^5=Pvp=PVPTSP=1";
var start = txt.indexOf("FSAPPS");
var end = txt.indexOf("=", start);
var login = txt.substring(start + 6, end);

jQuery to parse our a part of a url path

I need to parse long urls and set a variable (category) equal to one of the /folders/ in the path.
For example, a url that is
http://example.com/community/home/whatever.html
I need to set the variable equal to whatever folder path comes after /home/ in that url.
I've got this to alert me with what comes after /community/, but then the url turns to NaN and the link doesnt work. I think I'm not on the right track.
if ($(this.href*='http://example.com/community/')){
var category = url.split("community/");
alert(category[category.length - 1]);
}
Thoughts?
TIA.

You can fetch everything after the "/community/" with a regular expression:
var url = "http://www.example.com/community/whatever";
var category = "";
var matches = url.match(/\/community\/(.*)$/);
if (matches) {
category = matches[1]; // "whatever"
}
Working example here: http://jsfiddle.net/jfriend00/BL4jm/
If you want to get only the next path segment after community and nothing after that segment, then you could use this:
var url = "http://www.example.com/community/whatever/more";
var category = "";
var matches = url.match(/\/community\/([^\/]+)/);
if (matches) {
category = matches[1]; // "whatever"
} else {
// no match for the category
}
Workikng example of this one here:http://jsfiddle.net/jfriend00/vrvbT/

When you do this.href*= you're doing multiplication, and that's why you're getting not-a-number. It multiplies this.href by the string and assigns that to href.
If you mean to test whether the url starts with that string you can do it like this, no need for jQuery:
var start = 'http://example.com/community/';
if (url.substring(0, start.length) === start)){
var category = url.split("community/");
var lastPart = category[category.length - 1];
return lastPart.split("/")[0];
}