Develop Reference

Appending UTM parameters to my current URL

I am grabbing the utm parameters from the URL on my index page, and storing them in local storage, then I am using the script below to grab the parameters from local storage and appending them to the end of the contact page's URL.
<script>
var parameters = localStorage.getItem("url");
const nextURL = window.location.href + parameters;
window.history.replaceState(nextURL);
</script>
Problem: This script works perfectly, except each time I refresh the contact page, it appends the parameters again. How can I fix this?

Use URL and URLSearchParams to parse and modify the URL for you. That way you don't have to do any work to produce a valid string:
function buildUrl(fromURL, fromQuery) {
const url = new URL(fromURL);
const query = new URLSearchParams(fromQuery);
for (const [key, value] of query) {
url.searchParams.set(key, value);
}
return url.toString()
}
function test(fromURL, fromQuery) {
const url = buildUrl(fromURL, fromQuery);
return `fromURL: ${fromURL}
fromQuery: ${fromQuery}
result: ${url}
---------------------`;
}
console.log(test("http://example.com", ""));
console.log(test("http://example.com", "foo=1"));
console.log(test("http://example.com", "foo=1&bar=2"));
console.log(test("http://example.com", "foo=1&bar=2&baz=3"));
console.log(test("http://example.com?hello=world", ""));
console.log(test("http://example.com?hello=world", "foo=1"));
console.log(test("http://example.com?hello=world", "foo=1&bar=2"));
console.log(test("http://example.com?hello=world", "foo=1&bar=2&baz=3"));
console.log(test("http://example.com?bar=someValue", ""));
console.log(test("http://example.com?bar=someValue", "foo=1"));
console.log(test("http://example.com?bar=someValue", "foo=1&bar=2"));
console.log(test("http://example.com?bar=someValue", "foo=1&bar=2&baz=3"));

You can always do a quick if statement to check if parameters exists in the current URL and if not, add it.
if(window.location.href.indexOf("?" + parameters) == -1){
const nextURL = window.location.href + '?' + parameters;
window.history.replaceState('', '', nextURL);
}

Set body class based on url with params

Im trying to set a body class based on the url - I can get it to work with a plain /Tablet/ url, like the code below.
But I need to set it to a url that has params in it, and I can't get that to work. How do I do it with this url?
/Tablets/?param=grid&pld0page=1&spcs=1
Script:
$(function() {
var loc = window.location.href; // returns the full URL
if(/Tablets/.test(loc)) {
$('body').addClass('test');
}
});

If, as you have mentioned in comments, the query parameter order is important, you can use this...
var url = location.pathname + location.search
console.info(url)
$(document.body).toggleClass('test',
url === '/Tablets/?param=grid&pld0page=1&spcs=1')
This lets you omit the URL scheme, host and port parts, focusing only on the path and query parameters.

You just have to search for text you want in the url string. You are doing fine in the code above. Just change
$(function() {
var loc = window.location.href; // returns the full URL
if(loc.includes('Tablets')) { // will return true/false
$('body').addClass('test');
}
});
Read on includes or here. You can do the same for other tests too, if you are checking for other strings in url. Hope this helps.

You can use this
$(function() {
var url = window.location.href;
url = url.replace(/^.*\/\/[^\/]+/, '')
if(url == '/Tablets?param=grid&pld0page=1&spcs=1') {
$('body').addClass('test');
}
});
If your URL is "http://www.google.com/?param=grid&pld0page=1&spcs=1", then the above queryString variable would be equal to "?param=grid&pld0page=1&spcs=1".
You can check the string is not empty

Replace your code with this
var loc = window.location.href; // returns the full URL
var url = loc.split( '/' );
var chunk = url[ url.length - 2 ];
if(loc.indexOf(chunk) >= 0) {
$('body').addClass('test');
}

var loc = 'http://localhost/Tablets/?param=grid&pld0page=1&spcs=35';
var patt = new RegExp("/Tablets/");
if(patt.test(loc) && loc.split('?').length > 1)
{
console.log('true');
$('body').addClass('test');
}
else
{
console.log('false');
$('body').removeClass('test');
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

How to split url and call a javascript function

I want to convert my all wordpress theme link to be ajax enable. So, I am using this code
siteUrl = "http://" + top.location.host.toString(),
url = '';
$(document).delegate("a[href^='" + siteUrl + "']:not([href*=/wp-admin/]):not([href*=/wp-login.php]):not([href$=/feed/])", "click", function() {
var pathname = this.pathname;
return false;
});
Now, I want if this var pathname is like /ebook/some-ebook then I want to call the post_load() function and if it is like /ebook then I want to call the post_archive() javascript function.
ebook is a post-type and some-ebook is %postname%.
Thank you

I don't understand half of what you're asking...but it sounds like you just want to split() the pathname into its relevant pieces.
In that case, you can do something like the following:
var pathPieces = pathname.split('/', 3),
archiveName = pathPieces[1],
postName = pathPieces[2];
At that point, you can do whatever you want with those path pieces. For example:
if ( archiveName === 'ebook' ) {
post_archive();
}

Getting URL data with JavaScript (split it like php $_GET)

I found this script at Stack Overflow:
window.params = function(){
var params = {};
var param_array = window.location.href.split('?')[1].split('&');
for(var i in param_array){
x = param_array[i].split('=');
params[x[0]] = x[1];
}
return params;
}();
This splits a URL into data, like PHP does with $_GET.
I have another function, which uses it and it refreshes the iframe. I want to get the data from the URL and add another with it if some of these data exist. Firebug shows me, that search is not defined, but why?
function RefreshIFrames(MyParameter) {
var cat = window.params.cat;
var category = window.params.category;
var search = window.params.search;
if (search.length>0 && category.length>0){
window.location.href="http://siriusradio.hu/kiskunfelegyhaza/video/index.php?search="+search+"&category="+category+"&rendez="+MyParameter;
}
if (cat.length>0){
window.location.href="http://siriusradio.hu/kiskunfelegyhaza/video/index.php?cat="+cat+"&rendez="+MyParameter;
}
if (cat.length==0 && category.length==0 && search.length==0){
window.location.href="http://siriusradio.hu/kiskunfelegyhaza/video/index.php?rendez="+MyParameter;
}
alert(window.location);
}

If you want to add rendez OR change the existing rendez, do this - I am assuming the URL is actually beginning with http://siriusradio.hu/kiskunfelegyhaza/video/index.php so no need to create it. Let me know if you need a different URL than the one you come in with
The parameter snippet did not work proper (for in should not be used on a normal array)
Here is tested code
DEMO
DEMO WITH DROPDOWN
function getParams(passedloc){
var params = {}, loc = passedloc || document.URL;
loc = loc.split('?')[1];
if (loc) {
var param_array = loc.split('&');
for(var x,i=0,n=param_array.length;i<n; i++) {
x = param_array[i].split('=');
params[x[0]] = x[1];
}
}
return params;
};
function RefreshIFrames(MyParameter,passedloc) { // if second parm is specified it will take that
var loc = passedloc || document.URL; //
window.param = getParams(loc);
loc = loc.split("?")[0]+"?"; // will work with our without the ? in the URL
for (var parm in window.param) {
if (parm != "rendez") loc += parm +"="+ window.param[parm]+"&";
}
// here we have a URL without rendez but with all other parameters if there
// the URL will have a trailing ? or & depending on existence of parameters
loc += "rendez="+MyParameter;
window.console && console.log(loc)
// the next statement will change the URL
// change window.location to window.frames[0].location to change an iFrame
window.location = loc;
}
// the second parameter is only if you want to change the URL of the page you are in
RefreshIFrames("rendez1","http://siriusradio.hu/kiskunfelegyhaza/video/index.php?cat=cat1&search=search1");
RefreshIFrames("rendez2","http://siriusradio.hu/kiskunfelegyhaza/video/index.php?search=search2");
RefreshIFrames("rendez3","http://siriusradio.hu/kiskunfelegyhaza/video/index.php?rendez=xxx&search=search2");
RefreshIFrames("rendez4","http://siriusradio.hu/kiskunfelegyhaza/video/index.php");
// here is how I expect you want to call it
RefreshIFrames("rendez5"​); // will add or change rendez=... in the url of the current page

jQuery redirect to source url

I would like to redirect a user to a target URL on a button click. The target URL is variable and has to be read from the current page URL parameter 'source':
For instance, I have a url http://w/_l/R/C.aspx?source=http://www.google.com
When the user clicks on a button he's being redirect to http://www.google.com
How would I do that with jQuery?

first of all you need to get the url param : source
this can be done with a function like :
function GetParam(name) {
return decodeURI(
(RegExp(name + '=' + '(.+?)(&|$)').exec(location.search)||[,null])[1]
);
}
// you can use it like
var source = GetParam('source');
//then
window.location.href = source

On button click handler, just write window.location.href = http://www.google.com

You will need to parse the query string to get the value of the variable source.
You don't need jQuery for it.
A simple function like this will suffice:
function getFromQueryString(ji) {
hu = window.location.search.substring(1);
gy = hu.split("&");
for (i = 0; i < gy.length; i++) {
ft = gy[i].split("=");
if (ft[0] == ji) {
return ft[1];
}
}
}
location.href = getFromQueryString("source");

Using the url parsing code from here use this to parse your url (this should be included once in your document):
var urlParams = {};
(function () {
var e,
a = /\+/g, // Regex for replacing addition symbol with a space
r = /([^&=]+)=?([^&]*)/g,
d = function (s) { return decodeURIComponent(s.replace(a, " ")); },
q = window.location.search.substring(1);
while (e = r.exec(q))
urlParams[d(e[1])] = d(e[2]);
})();
Then do this to redirect to the source parameter:
window.location.href = urlParams["source"];

Since you are using the jQuery framework, I'd make use of the jQuery URL Parser plugin, which safely parses and decodes URL parameters, fragment...
You can use it like this:
var source = $.url().param('source');
window.location.href = source;

get url params : (copied from another stackoverflow question) :
var params= {};
document.location.search.replace(/\??(?:([^=]+)=([^&]*)&?)/g, function () {
function decode(s) {
return decodeURIComponent(s.split("+").join(" "));
}
params[decode(arguments[1])] = decode(arguments[2]);
});
window.location = params['source'];

You can do like this,
<a id="linkId" href=" http://w/_l/R/C.aspx?source=http://www.google.com">Click me</a>
$('#linkId').click(function(e){
var href=$(this).attr('href');
var url=href.substr(href.indexof('?'))
window.location =url;
return false;
});