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append url parameter if exists or add if not exists jQuery

I am creating a filter based on size, color etc. So it is possible to select multiple items. When I click each item it should append to current URL. Please check the below URL,
If parameter not exists in URL
http://example.com/category-3?tracker=Q2F0ZWdvcnkgMw&color=White
If parameter exists and selected same color
http://example.com/category-3?tracker=Q2F0ZWdvcnkgMw&color=White
If parameter exists and selected multiple colors
http://example.com/category-3?tracker=Q2F0ZWdvcnkgMw&color=White-Black
How to implement the same using jQuery. I have tried using below code,
function setGetParameter(paramName, paramValue) {
var url = window.location.href;
var hash = location.hash;
url = url.replace(hash, '');
if (url.indexOf(paramName + "=") >= 0) {
var prefix = url.substring(0, url.indexOf(paramName + "="));
var suffix = url.substring(url.indexOf(paramName + "="));
suffix = suffix.substring(suffix.indexOf("=") + 1);
suffix = (suffix.indexOf("&") >= 0) ? suffix.substring(suffix.indexOf("&")) : "";
url = prefix + paramName + "=" + paramValue + suffix + "-";
} else {
if (url.indexOf("?") < 0)
url += "?" + paramName + "=" + paramValue + "-";
else
url += "&" + paramName + "=" + paramValue + "-";
}
window.location.href = url + hash;
}
The above code works with single parameter value. For multiple values how to alter the above code.

I recommend not using this code at all to build a URL.
Use something like https://medialize.github.io/URI.js/ which happen to have a jQuery plugin.
Why?
Your query parameters here are not encoded, so it could "break" the url. Using a library such as URI.js with a builder to append your query parameters will tackle your issues. Parsing and building URLs is not as trivial as it may seem, so it is better to rely on tested code.
var url = URI(window.location.href); // no need to remove and add the hash back anymore
var queryMap = url.query(true);
if (queryMap[paramName]) {
// param already exists
var values = queryMap[paramName].split('-');
if (!values.includes(paramValue)) {
// paramValue not found: add it
values.push(paramValue);
url.setQuery(paramName, values.join('-'));
}
} else {
// param does not exist yet
url.setQuery(paramName, paramValue);
}
window.location.href = url.toString();

Removing or Replacing # (hash) in URL using Regex

I'm new to regex and I'm using it in jquery to remove/replace the url but when i triggered an anchortag with href="#" the url will add a # and I'm not able to replace it with my current regex fix to replace the url.
http://localhost:3131/Main/MainPage?a=1221#&ab=&ac=
the original link onload is
http://localhost:3131/Main/MainPage?a=1221
but after triggering an anchortag with href="#" return, it becomes this:
http://localhost:3131/Main/MainPage?a=1221#
and my expected result upon removing the hash(#) in my url is this:
http://localhost:3131/Main/MainPage?a=1221&ab=&ac=
heres my function for replacing the url when closing modal windows in jquery
function updateQueryStringParameter(uri, key, value, key1,value1) {
var re = new RegExp("([?&])" + key + "=.*?(&|$)" + key1 + "=.*?(&|$)", "i");
var separator = uri.indexOf('?') !== -1 ? "&" : "?";
if (uri.match(re)) {
return uri.replace(re, '$1' + key + "=" + value + '$2' + key1 + "=" + value1 + '$3' );
}
else {
return uri + separator + key + "=" + value + separator + key1 + "=" + value1;
}
};
Hope someone can help me as i am a beginner on using Regular expression specially in jquery.
Thanks!

How do I render a variable in a URL path in JavaScript?

I have the following line:
var myCustomVariable = '3434';
urlpath = '/people/myCustomVariable/folders/byid/'
I want to render the value of myCustomVariable in the urlpath but being new to JS I am unable to figure this out. I tried doing the following but didn't work:
"+myCustomVariable+"!"
What am I doing wrong?

You use the + operator:
var myCustomVariable = '3434';
urlpath = '/people/' + myCustomVariable + '/folders/byid/'
This is called "concatenation" or (because we're dealing with strings) "string concatenation."
Your "I tried doing the following..." uses double quotes and a !. I'm not sure where the ! comes from, but in JavaScript, if you open a string with a single quote, you must end it with a single quote; and if you open it with a double quote, you must end it with a double quote.

Just do the concatenation of strings like this:
var myCustomVariable = '3434';
urlpath = '/people/' + myCustomVariable + '/folders/byid/'
When you do this:
"+myCustomVariable+"
That represents a string, not your variable. Your variable is
myCustomVariable
Without the " aroud it
See this:
var myCustomVariable = '3434';
//This
urlpath = '/people/' + myCustomVariable + '/folders/byid/'
//Same than
urlpath = '/people/' + '3434' + '/folders/byid/'
//Same than
urlpath = '/people/3434/folders/byid/'
But
var myCustomVariable = '3434';
//This
urlpath = '/people/' + '+myCustomVariable+' + '/folders/byid/'
//Same than
urlpath = '/people/+myCustomVariable+/folders/byid/'

How to add 12 to a string?

Hi I have a string that contains the URL as in below
http://www.myurl.com/abc/asdd/asd/rwewe/saaa/all-makes?expanded=no&s=true&searchLimit=12&searchOffset=24
I am storing the URL in a js string as below
var backToSearch = $(location).attr('href');
//typeof(backToSearch);
I want to add 12 to searchOffset and then set it to cookie myCookie.
$.cookie('myCookie', backToSearch , { path: '/' });
When 12 is added it will be like
http://www.myurl.com/abc/asdd/asd/rwewe/saaa/all-makes?expanded=no&s=true&searchLimit=12&searchOffset=36
How to add 12 to the string?

How about;
url = url.replace(/searchOffset=(\d+)/, function(a, b) {
return "searchOffset=" + (parseInt(b, 10) + 12);
})

Try
function getURLParameter(name) { //get getURLParameter value
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)').exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null
}
var searchOffset = getURLParameter(searchOffset), //get Current value
newSearchOffset = +searchOffset + 12; // set new value
var backToSearch = $(location).attr('href')
.replace('searchOffset=' + searchOffset, 'searchOffset=' + newSearchOffset);
//replace old value with new one
String.replace()
decodeURIComponent()

Mine was a little bit more long winded than the rest I believe:
<script type="text/javascript">
var backToSearch = $(location).attr('href');
var split = backToSearch.split("searchOffset=");
var number = parseInt(split[1]);
number += 12;
var url = split[0] + "searchOffset=" + number.toString();
</script>

If you have the searchOffset=24 parameter,
just get the value, parse it as number then add 12
parseInt(searchOffset)+12

The solution I used at the end is as below
var backToSearch = $(location).attr('href');
backToSearch = backToSearch .replace(/searchOffset=(\d+)/, function(a, b) {
return "searchOffset=" + (parseInt(b, 10) + 12);
})

Add / Change parameter of URL and redirect to the new URL

If the &view-all parameter does NOT exist in the URL I need to add it to the end of the URL along with a value. If it DOES exist then I need to be able to just change the value without creating a new URL because it might, or might not, have other parameters before it.
I found this function but I can't get it to work: https://stackoverflow.com/a/10997390/837705
Here is the code I have using the function above (which I can't get to work): http://jsfiddle.net/Draven/tTPYL/4/
I know how to append the parameter and value already:
<div onclick="javascript: window.location.assign(window.location.href+='&view-all=Yes');">Blah Blah</div>
More Info:
If the URL is http://www.domain.com/index.php?action=my_action then the default "&view-all" value would be "Yes" so the URL they would be directed to when they click the button is http://www.domain.com/index.php?action=my_action&view-all=Yes.
If the URL is http://www.domain.com/index.php?action=my_action&view-all=Yes then when they click the button it would change to http://www.domain.com/index.php?action=my_action&view-all=No​​​
EDIT: Please give me examples. I don't know alot of JS, and I just can't think of a way to do it in PHP.

function setGetParameter(paramName, paramValue)
{
var url = window.location.href;
var hash = location.hash;
url = url.replace(hash, '');
if (url.indexOf(paramName + "=") >= 0)
{
var prefix = url.substring(0, url.indexOf(paramName + "="));
var suffix = url.substring(url.indexOf(paramName + "="));
suffix = suffix.substring(suffix.indexOf("=") + 1);
suffix = (suffix.indexOf("&") >= 0) ? suffix.substring(suffix.indexOf("&")) : "";
url = prefix + paramName + "=" + paramValue + suffix;
}
else
{
if (url.indexOf("?") < 0)
url += "?" + paramName + "=" + paramValue;
else
url += "&" + paramName + "=" + paramValue;
}
window.location.href = url + hash;
}
Call the function above in your onclick event.

Why parse the query string yourself when you can let the browser do it for you?
function changeQS(key, value) {
let urlParams = new URLSearchParams(location.search.substr(1));
urlParams.set(key, value);
location.search = urlParams.toString();
}

All the preivous solution doesn't take in account posibility of the substring in parameter. For example http://xyz?ca=1&a=2 wouldn't select parameter a but ca. Here is function which goes through parameters and checks them.
function setGetParameter(paramName, paramValue)
{
var url = window.location.href;
var hash = location.hash;
url = url.replace(hash, '');
if (url.indexOf("?") >= 0)
{
var params = url.substring(url.indexOf("?") + 1).split("&");
var paramFound = false;
params.forEach(function(param, index) {
var p = param.split("=");
if (p[0] == paramName) {
params[index] = paramName + "=" + paramValue;
paramFound = true;
}
});
if (!paramFound) params.push(paramName + "=" + paramValue);
url = url.substring(0, url.indexOf("?")+1) + params.join("&");
}
else
url += "?" + paramName + "=" + paramValue;
window.location.href = url + hash;
}

I had a similar situation where I wanted to replace a URL query parameter. However, I only had one param, and I could simply replace it:
window.location.search = '?filter=' + my_filter_value
The location.search property allows you to get or set the query portion of a URL.

To do it in PHP: You have a couple of parameters to view your page, lets say action and view-all. You will (probably) access these already with $action = $_GET['action'] or whatever, maybe setting a default value.
Then you decide depending on that if you want to swich a variable like $viewAll = $viewAll == 'Yes' ? 'No' : 'Yes'.
And in the end you just build the url with these values again like
$clickUrl = $_SERVER['PHP_SELF'] . '?action=' . $action . '&view-all=' . $viewAll;
And thats it.
So you depend on the page status and not the users url (because maybe you decide later that $viewAll is Yes as default or whatever).

Some simple ideas to get you going:
In PHP you can do it like this:
if (!array_key_exists(explode('=', explode('&', $_GET))) {
/* add the view-all bit here */
}
In javascript:
if(!location.search.match(/view\-all=/)) {
location.href = location.href + '&view-all=Yes';
}

though i take the url from an input, it's easy adjustable to the real url.
var value = 0;
$('#check').click(function()
{
var originalURL = $('#test').val();
var exists = originalURL.indexOf('&view-all');
if(exists === -1)
{
$('#test').val(originalURL + '&view-all=value' + value++);
}
else
{
$('#test').val(originalURL.substr(0, exists + 15) + value++);
}
});
http://jsfiddle.net/8YPh9/31/

Here's a way of accomplishing this. It takes the param name and param value, and an optional 'clear'. If you supply clear=true, it will remove all other params and just leave the newly added one - in other cases, it will either replace the original with the new, or add it if it's not present in the querystring.
This is modified from the original top answer as that one broke if it replaced anything but the last value. This will work for any value, and preserve the existing order.
function setGetParameter(paramName, paramValue, clear)
{
clear = typeof clear !== 'undefined' ? clear : false;
var url = window.location.href;
var queryString = location.search.substring(1);
var newQueryString = "";
if (clear)
{
newQueryString = paramName + "=" + paramValue;
}
else if (url.indexOf(paramName + "=") >= 0)
{
var decode = function (s) { return decodeURIComponent(s.replace(/\+/g, " ")); };
var keyValues = queryString.split('&');
for(var i in keyValues) {
var key = keyValues[i].split('=');
if (key.length > 1) {
if(newQueryString.length > 0) {newQueryString += "&";}
if(decode(key[0]) == paramName)
{
newQueryString += key[0] + "=" + encodeURIComponent(paramValue);;
}
else
{
newQueryString += key[0] + "=" + key[1];
}
}
}
}
else
{
if (url.indexOf("?") < 0)
newQueryString = "?" + paramName + "=" + paramValue;
else
newQueryString = queryString + "&" + paramName + "=" + paramValue;
}
window.location.href = window.location.href.split('?')[0] + "?" + newQueryString;
}

i would suggest a little change to #Lajos's answer... in my particular situation i could potentially have a hash as part of the url, which will cause problems for parsing the parameter that we're inserting with this method after the redirect.
function setGetParameter(paramName, paramValue) {
var url = window.location.href.replace(window.location.hash, '');
if (url.indexOf(paramName + "=") >= 0) {
var prefix = url.substring(0, url.indexOf(paramName));
var suffix = url.substring(url.indexOf(paramName));
suffix = suffix.substring(suffix.indexOf("=") + 1);
suffix = (suffix.indexOf("&") >= 0) ? suffix.substring(suffix.indexOf("&")) : "";
url = prefix + paramName + "=" + paramValue + suffix;
}else {
if (url.indexOf("?") < 0)
url += "?" + paramName + "=" + paramValue;
else
url += "&" + paramName + "=" + paramValue;
}
url += window.location.hash;
window.location.href = url;
}

This is my sample code for rebuild url query string with JS
//function get current parameters
$.urlParam = function(name){
var results = new RegExp('[\?&]' + name + '=([^&#]*)').exec(window.location.href);
if (results==null){
return null;
}
else{
return results[1] || 0;
}
};
//build a new parameters
var param1 = $.urlParam('param1');
var param2 = $.urlParam('param2');
//check and create an array to save parameters
var params = {};
if (param1 != null) {
params['param1'] = param1;
}
if (order != null) {
params['param2'] = param2;
}
//build a new url with new parameters using jQuery param
window.location.href = window.location.origin + window.location.pathname + '?' + $.param(params);
I used JQUERY param: http://api.jquery.com/jquery.param/ to create a new url with new parameters.

I need help to adjust my script below or to find a script that could be used on my wordpress site to grab the url suffix parameters from a forward url, then to be added at the button click url for tracking the proper forward ads id.
REASON: parameters are used for advertisement tracking to find out from which ad the user has been forward, even if the user hops from optin page to the sales page by using button click.
Here the goal to reach:
1. An FB ad points to an optin page with tracking code: https://ownsite.com/optin-page/?tid=fbad1
2. At the optin-page there is a button with a setup URL to forward to the sales page, but if clicked then only the URL is forward, but the parameter "?tid=fbad1" is missing.
3. The auto-forward script below (which is working properly) can be used to change for button click forward, but has a limitation as it grab only "tid" parameters instead also utm parameters.
Therefore a script code shall be implemented to establish click buttons (also to style them or use images instead) and while clicking the button to forward to a different sales page with grabbing the suffix parameter form the current optin-page to forward then to sales-page https://ownsite.com/sales-page/?tid=fbad1 also including UTM parameters
Currently, I could have solved this by using an auto-redirect script, but
A.) I do not want to use an autoredirect at this page. Better is an event click button used to let the user himself click to forward with the URL parameter included.
B.) The tracking ID parameter in this script is limited to "?tid=..." instead I do also want to track the UTM code on button click also
i.e. Grab from current page the paramater of URL https://www.optin-page.com/?tid=facebookad1?utm_campaign=blogpost then on button click grab parameters and add to button set URL https://www.sales-page.com/?tid=facebookad1?utm_campaign=blogpost
Please now find here the Code below in use for auto-redirect and grabbing the URL parameters. This code shall be changed now to be able to create a button with a click-event to be redirect then to the forward URL with parameter grabbing of current URL if the button is clicked (as stated above).
<p><!-- Modify this according to your requirement - core script from https://gist.github.com/Joel-James/62d98e8cb3a1b6b05102 and suffix grabbing </p>
<h3 style="text-align: center;"><span style="color: #ffffff; background-color: #039e00;">►Auto-redirecting after <span id="countdown">35</span> seconds◄</span></h3>
<p><!-- JavaScript part --><br /><script type="text/javascript">
function findGetParameter(parameterName) {
var result = null,
tmp = [];
location.search
.substr(1)
.split("&")
.forEach(function (item) {
tmp = item.split("=");
if (tmp[0] === parameterName) result = decodeURIComponent(tmp[1]);
});
return result;
}
// Total seconds to wait
var seconds = 45;
function countdown() {
seconds = seconds - 1;
if (seconds < 0) {
// Chnage your redirection link here
var tid = findGetParameter('tid');
window.location = "https://www.2share.info/ql-cb2/" + '?tid='+tid;
} else {
// Update remaining seconds
document.getElementById("countdown").innerHTML = seconds;
// Count down using javascript
window.setTimeout("countdown()", 1000);
}
}
// Run countdown function
countdown();
</script></p>

var updateQueryStringParameter = function (key, value) {
var baseUrl = [location.protocol, '//', location.host, location.pathname].join(''),
urlQueryString = document.location.search,
newParam = key + '=' + value,
params = '?' + newParam;
// If the "search" string exists, then build params from it
if (urlQueryString) {
var updateRegex = new RegExp('([\?&])' + key + '[^&]*');
var removeRegex = new RegExp('([\?&])' + key + '=[^&;]+[&;]?');
if( typeof value == 'undefined' || value == null || value == '' ) {
params = urlQueryString.replace(removeRegex, "$1");
params = params.replace( /[&;]$/, "" );
} else if (urlQueryString.match(updateRegex) !== null) {
params = urlQueryString.replace(updateRegex, "$1" + newParam);
} else {
params = urlQueryString + '&' + newParam;
}
}
// no parameter was set so we don't need the question mark
params = params == '?' ? '' : params;
window.history.replaceState({}, "", baseUrl + params);
};

I think something like this would work, upgrading the #Marc code:
//view-all parameter does NOT exist
$params = $_GET;
if(!isset($_GET['view-all'])){
//Adding view-all parameter
$params['view-all'] = 'Yes';
}
else{
//view-all parameter does exist!
$params['view-all'] = ($params['view-all'] == 'Yes' ? 'No' : 'Yes');
}
$new_url = $_SERVER['PHP_SELF'].'?'.http_build_query($params);