Question

I apologize in advance for not being able to supply more information, if this is not possible with the limited info, I will delete the question.

So, I have a script that generates kind of a search engine that depends on the script (also dinamically generated) which is quite complicated and I don’t have any impact on it.

When you click on the apply (search) button, the search process is triggered and you can see the results on the new URL that has a few parameters.

E. g.: http://www..example.com/...&ThisParameter=XYZ&SecondParameter=foo&ThirdParameter=bar

My question is – is it possible to change "ThisParameter=XYZ" to something else, e. g. "ThisParameter=Something".

The problem is that I don’t know how the URL is constructed and can’i impact it, so I would need a code that would just take any URL generated and change this part mentioned.

Thank you for your opinions in advance!

EDIT

I have found the part of the script that impacts the URL generated. When I change it in DOM, it does redirect me to the desired page.

var options = {"FOO":123,"BAR":"ABC","ThisParameter":"STH","EXAMPLE":123, ...}

And this is the output when you choose “copy path”:

_options[0].ThisParameter

Answer 1

IF THE SEQUENCE OF QUERY PARAMETERS ARE ALWAYS THE SAME:

var url = window.location.href;
var lst_temp = url.split('?');
var $lst_parts = lst_temp[1].split('&');

var new_val = 'blabla';
var position = 'x';
lst_parts[x] = 'ThisParameter=' + new_val;

var url_new = lst_temp[0] + '?';
url_new += lst_parts.join('&');

EDIT:
IF ORDERING OF QUERY KEYS ARE NOT KNOWN BEFORE HAND, DO THIS:

Use this function from here: https://stackoverflow.com/a/111545/888177

function EncodeQueryData(arr_data) {
   var ret = [];
   for (var d in arr_data)
      ret.push(encodeURIComponent(d) + "=" + encodeURIComponent(arr_data[d]));
   return ret.join("&");
}

Then read the url and split it like this:

var url = window.location.href;
var key = "ThisParameter";
var new_val = 'blabla';
var lst_temp = url.split('?');
var lst_parts = lst_temp[1].split('&');   

Add this loop to create an associative array containing the query parameters and values:

var arr_data = new Array();
for (var index in lst_parts) {
   lst = lst_parts[index].split('=');
   arr_data[lst[0]] = lst[1];
}

To avoid endless refresh:

var val = arr_data[key];
if (val != new_val) {
  arr_data[key] = new_val;
  var  new_url = lst_temp[0] + '?' + EncodeQueryData(arr_data);
  window.location.href = new_url;
}