Change URL parameters and specify defaults using JavaScript

I have this URL:

site.fwx?position=1&archiveid=5000&columns=5&rows=20&sorting=ModifiedTimeAsc

what I need is to be able to change the 'rows' url param value to something i specify, lets say 10. And if the 'rows' doesn't exist, I need to add it to the end of the url and add the value i've already specified (10).

I've extended Sujoy's code to make up a function.

/**
 * http://stackoverflow.com/a/10997390/11236
 */
function updateURLParameter(url, param, paramVal){
    var newAdditionalURL = "";
    var tempArray = url.split("?");
    var baseURL = tempArray[0];
    var additionalURL = tempArray[1];
    var temp = "";
    if (additionalURL) {
        tempArray = additionalURL.split("&");
        for (var i=0; i<tempArray.length; i++){
            if(tempArray[i].split('=')[0] != param){
                newAdditionalURL += temp + tempArray[i];
                temp = "&";
            }
        }
    }
    
    var rows_txt = temp + "" + param + "=" + paramVal;
    return baseURL + "?" + newAdditionalURL + rows_txt;
}

Function Calls:

var newURL = updateURLParameter(window.location.href, 'locId', 'newLoc');
newURL = updateURLParameter(newURL, 'resId', 'newResId');

window.history.replaceState('', '', updateURLParameter(window.location.href, "param", "value"));

Updated version that also take care of the anchors on the URL.

function updateURLParameter(url, param, paramVal)
{
    var TheAnchor = null;
    var newAdditionalURL = "";
    var tempArray = url.split("?");
    var baseURL = tempArray[0];
    var additionalURL = tempArray[1];
    var temp = "";

    if (additionalURL) 
    {
        var tmpAnchor = additionalURL.split("#");
        var TheParams = tmpAnchor[0];
            TheAnchor = tmpAnchor[1];
        if(TheAnchor)
            additionalURL = TheParams;

        tempArray = additionalURL.split("&");

        for (var i=0; i<tempArray.length; i++)
        {
            if(tempArray[i].split('=')[0] != param)
            {
                newAdditionalURL += temp + tempArray[i];
                temp = "&";
            }
        }        
    }
    else
    {
        var tmpAnchor = baseURL.split("#");
        var TheParams = tmpAnchor[0];
            TheAnchor  = tmpAnchor[1];

        if(TheParams)
            baseURL = TheParams;
    }

    if(TheAnchor)
        paramVal += "#" + TheAnchor;

    var rows_txt = temp + "" + param + "=" + paramVal;
    return baseURL + "?" + newAdditionalURL + rows_txt;
}

I think you want the query plugin.

E.g.:

window.location.search = jQuery.query.set("rows", 10);

This will work regardless of the current state of rows.

To answer my own question 4 years later, after having learned a lot. Especially that you shouldn't use jQuery for everything. I've created a simple module that can parse/stringify a query string. This makes it easy to modify the query string.

You can use query-string as follows:

// parse the query string into an object
var q = queryString.parse(location.search);
// set the `row` property
q.rows = 10;
// convert the object to a query string
// and overwrite the existing query string
location.search = queryString.stringify(q);

Quick little solution in pure js, no plugins needed:

function replaceQueryParam(param, newval, search) {
	var regex = new RegExp("([?;&])" + param + "[^&;]*[;&]?");
    var query = search.replace(regex, "$1").replace(/&$/, '');

    return (query.length > 2 ? query + "&" : "?") + (newval ? param + "=" + newval : '');
}

Call it like this:

 window.location = '/mypage' + replaceQueryParam('rows', 55, window.location.search)

Or, if you want to stay on the same page and replace multiple params:

 var str = window.location.search
 str = replaceQueryParam('rows', 55, str)
 str = replaceQueryParam('cols', 'no', str)
 window.location = window.location.pathname + str

edit, thanks Luke: To remove the parameter entirely, pass false or null for the value: replaceQueryParam('rows', false, params). Since 0 is also falsy, specify '0'.

A modern approach to this is to use native standard based URLSearchParams. It's supported by all major browsers, except for IE where they're polyfills available

const paramsString = "site.fwx?position=1&archiveid=5000&columns=5&rows=20&sorting=ModifiedTimeAsc"
const searchParams = new URLSearchParams(paramsString);
searchParams.set('rows', 10);
console.log(searchParams.toString()); // return modified string.

Ben Alman has a good jquery querystring/url plugin here that allows you to manipulate the querystring easily.

As requested -

Goto his test page here

In firebug enter the following into the console

jQuery.param.querystring(window.location.href, 'a=3&newValue=100');

It will return you the following amended url string

> http://benalman.com/code/test/js-jquery-url-querystring.html?a=3&b=Y&c=Z&newValue=100#n=1&o=2&p=3

Notice the a querystring value for a has changed from X to 3 and it has added the new value.

You can then use the new url string however you wish e.g using document.location = newUrl or change an anchor link etc

you can do it via normal JS also

var url = document.URL
var newAdditionalURL = "";
var tempArray = url.split("?");
var baseURL = tempArray[0];
var aditionalURL = tempArray[1]; 
var temp = "";
if(aditionalURL)
{
var tempArray = aditionalURL.split("&");
for ( var i in tempArray ){
	if(tempArray[i].indexOf("rows") == -1){
			newAdditionalURL += temp+tempArray[i];
				temp = "&";
			}
		}
}
var rows_txt = temp+"rows=10";
var finalURL = baseURL+"?"+newAdditionalURL+rows_txt;

This is the modern way to change URL parameters:

function setGetParam(key,value) {
  if (history.pushState) {
  	var params = new URLSearchParams(window.location.search);
  	params.set(key, value);
    var newUrl = window.location.protocol + "//" + window.location.host + window.location.pathname + '?' + params.toString();
    window.history.pushState({path:newUrl},'',newUrl);
  }
}

Use URLSearchParams to check, get and set the parameters value into URL

Here is the example to get the current URL and set new parameter and update the URL or reload the page as per your needs

var rows = 5; // value that you want to set
var url = new URL(window.location);
(url.searchParams.has('rows') ? url.searchParams.set('rows', rows) : url.searchParams.append('rows', rows));

url.search = url.searchParams;
url        = url.toString();

// if you want to append into URL without reloading the page
history.pushState({}, null, url);

// want to reload the window with a new param
window.location = url;

Would a viable alternative to String manipulation be to set up an html form and just modify the value of the rows element?

So, with html that is something like

<form id='myForm' target='site.fwx'>
    <input type='hidden' name='position' value='1'/>
    <input type='hidden' name='archiveid' value='5000'/>
    <input type='hidden' name='columns' value='5'/>
    <input type='hidden' name='rows' value='20'/>
    <input type='hidden' name='sorting' value='ModifiedTimeAsc'/>
</form>

With the following JavaScript to submit the form

var myForm = document.getElementById('myForm');
myForm.rows.value = yourNewValue;
myForm.submit();

Probably not suitable for all situations, but might be nicer than parsing the URL string.

2020 Solution: sets the variable or removes iti if you pass null or undefined to the value.

var setSearchParam = function(key, value) {
    if (!window.history.pushState) {
        return;
    }

    if (!key) {
        return;
    }

    var url = new URL(window.location.href);
    var params = new window.URLSearchParams(window.location.search);
    if (value === undefined || value === null) {
        params.delete(key);
    } else {
        params.set(key, value);
    }

    url.search = params;
    url = url.toString();
    window.history.replaceState({url: url}, null, url);
}

URL query parameters can be easily modified using URLSearchParams and History interfaces:

// Construct URLSearchParams object instance from current URL querystring.
var queryParams = new URLSearchParams(window.location.search);
 
// Set new or modify existing parameter value. 
//queryParams.set("myParam", "myValue");
queryParams.set("rows", "10");
 
// Replace current querystring with the new one.
history.replaceState(null, null, "?"+queryParams.toString());

Alternatively instead of modifying current history entry using replaceState() we can use pushState() method to create a new one:

history.pushState(null, null, "?"+queryParams.toString());

https://zgadzaj.com/development/javascript/how-to-change-url-query-parameter-with-javascript-only

You can use this my library to do the job: https://github.com/Mikhus/jsurl

var url = new Url('site.fwx?position=1&archiveid=5000&columns=5&rows=20&sorting=ModifiedTimeAsc');
url.query.rows = 10;
alert( url);

Consider this one:

const myUrl = new URL("http://www.example.com?columns=5&rows=20");
myUrl.searchParams.set('rows', 10);
console.log(myUrl.href); // http://www.example.com?columns=5&rows=10
myUrl.searchParams.set('foo', 'bar'); // add new param
console.log(myUrl.href); // http://www.example.com?columns=5&rows=10&foo=bar

It will do exactly the same thing you required. Please note URL must have correct format. In your example you have to specify protocol (either http or https)

I wrote a little helper function that works with any select. All you need to do is add the class "redirectOnChange" to any select element, and this will cause the page to reload with a new/changed querystring parameter, equal to the id and value of the select, e.g:

<select id="myValue" class="redirectOnChange"> 
    <option value="222">test222</option>
    <option value="333">test333</option>
</select>

The above example would add "?myValue=222" or "?myValue=333" (or using "&" if other params exist), and reload the page.

jQuery:

$(document).ready(function () {

    //Redirect on Change
    $(".redirectOnChange").change(function () {
        var href = window.location.href.substring(0, window.location.href.indexOf('?'));
        var qs = window.location.href.substring(window.location.href.indexOf('?') + 1, window.location.href.length);
        var newParam = $(this).attr("id") + '=' + $(this).val();

        if (qs.indexOf($(this).attr("id") + '=') == -1) {
            if (qs == '') {
                qs = '?'
            }
            else {
                qs = qs + '&'
            }
            qs = qs + newParam;

        }
        else {
            var start = qs.indexOf($(this).attr("id") + "=");
            var end = qs.indexOf("&", start);
            if (end == -1) {
                end = qs.length;
            }
            var curParam = qs.substring(start, end);
            qs = qs.replace(curParam, newParam);
        }
        window.location.replace(href + '?' + qs);
    });
});

Using javascript URL:

var url = new URL(window.location);
(url.searchParams.has('rows') ? url.searchParams.set('rows', rows) : url.searchParams.append('rows', rows));
window.location = url;

var url = new URL(window.location.href);
var search_params = url.searchParams;
search_params.set("param", value);
url.search = search_params.toString();
var new_url = url.pathname + url.search;
window.history.replaceState({}, '', new_url);

Here I have taken Adil Malik's answer and fixed the 3 issues I identified with it.

/**
 * Adds or updates a URL parameter.
 *
 * @param {string} url  the URL to modify
 * @param {string} param  the name of the parameter
 * @param {string} paramVal  the new value for the parameter
 * @return {string}  the updated URL
 */
self.setParameter = function (url, param, paramVal){
  // http://stackoverflow.com/a/10997390/2391566
  var parts = url.split('?');
  var baseUrl = parts[0];
  var oldQueryString = parts[1];
  var newParameters = [];
  if (oldQueryString) {
    var oldParameters = oldQueryString.split('&');
    for (var i = 0; i < oldParameters.length; i++) {
      if(oldParameters[i].split('=')[0] != param) {
        newParameters.push(oldParameters[i]);
      }
    }
  }
  if (paramVal !== '' && paramVal !== null && typeof paramVal !== 'undefined') {
    newParameters.push(param + '=' + encodeURI(paramVal));
  }
  if (newParameters.length > 0) {
    return baseUrl + '?' + newParameters.join('&');
  } else {
    return baseUrl;
  }
}

Here is what I do. Using my editParams() function, you can add, remove, or change any parameter, then use the built in replaceState() function to update the URL:

window.history.replaceState('object or string', 'Title', 'page.html' + editParams('sorting', ModifiedTimeAsc));


// background functions below:

// add/change/remove URL parameter
// use a value of false to remove parameter
// returns a url-style string
function editParams (key, value) {
  key = encodeURI(key);

  var params = getSearchParameters();

  if (Object.keys(params).length === 0) {
    if (value !== false)
      return '?' + key + '=' + encodeURI(value);
    else
      return '';
  }
  
  if (value !== false)
    params[key] = encodeURI(value);
  else
    delete params[key];

  if (Object.keys(params).length === 0)
    return '';

  return '?' + $.map(params, function (value, key) {
    return key + '=' + value;
  }).join('&');
}

// Get object/associative array of URL parameters
function getSearchParameters () {
  var prmstr = window.location.search.substr(1);
  return prmstr !== null && prmstr !== "" ? transformToAssocArray(prmstr) : {};
}

// convert parameters from url-style string to associative array
function transformToAssocArray (prmstr) {
  var params = {},
      prmarr = prmstr.split("&");

  for (var i = 0; i < prmarr.length; i++) {
    var tmparr = prmarr[i].split("=");
    params[tmparr[0]] = tmparr[1];
  }
  return params;
}

My solution:

const setParams = (data) => {
	if (typeof data !== 'undefined' && typeof data !== 'object') {
		return
	}

	let url = new URL(window.location.href)
	const params = new URLSearchParams(url.search)

	for (const key of Object.keys(data)) {
		if (data[key] == 0) {
			params.delete(key)
		} else {
			params.set(key, data[key])
		}
	}

	url.search = params
	url = url.toString()
	window.history.replaceState({ url: url }, null, url)
}

Then just call "setParams" and pass an object with data you want to set.

Example:

$('select').on('change', e => {
	const $this = $(e.currentTarget)
	setParams({ $this.attr('name'): $this.val() })
})

In my case I had to update a html select input when it changes and if the value is "0", remove the parameter. You can edit the function and remove the parameter from the url if the object key is "null" as well.

Hope this helps yall

If you want to change the url in address bar:

const search = new URLSearchParams(location.search);
search.set('rows', 10);
location.search = search.toString();

Note, changing location.search reloads the page.

Here is a simple solution using the query-string library.

const qs = require('query-string')
function addQuery(key, value) {
  const q = qs.parse(location.search)
  const url = qs.stringifyUrl(
    {
      url: location.pathname,
      query: {
      ...q,
      [key]: value,
      },
    },
    { skipEmptyString: true }
  );
  window.location.href = url
  // if you are using Turbolinks
  // add this: Turbolinks.visit(url)
}
// Usage
addQuery('page', 2)

If you are using react without react-router

export function useAddQuery() {
  const location = window.location;
  const addQuery = useCallback(
    (key, value) => {
      const q = qs.parse(location.search);
      const url = qs.stringifyUrl(
        {
          url: location.pathname,
          query: {
            ...q,
            [key]: value,
          },
        },
        { skipEmptyString: true }
      );
      window.location.href = url
    },
    [location]
  );

  return { addQuery };
}
// Usage
const { addQuery } = useAddQuery()
addQuery('page', 2)

If you are using react with react-router

export function useAddQuery() {
  const location = useLocation();
  const history = useHistory();

  const addQuery = useCallback(
    (key, value) => {
      let pathname = location.pathname;
      let searchParams = new URLSearchParams(location.search);
      searchParams.set(key, value);
      history.push({
        pathname: pathname,
        search: searchParams.toString()
      });
    },
    [location, history]
  );

  return { addQuery };
}

// Usage
const { addQuery } = useAddQuery()
addQuery('page', 2)

PS: qs is the import from query-string module.

In the URLSearchParams documentation, there's a very clean way of doing this, without affecting the history stack.

// URL: https://example.com?version=1.0
const params = new URLSearchParams(location.search);
params.set('version', 2.0);

window.history.replaceState({}, '', `${location.pathname}?${params}`);
// URL: https://example.com?version=2.0

Similarily, to remove a parameter

params.delete('version')
window.history.replaceState({}, '', `${location.pathname}?${params}`);
// URL: https://example.com?

Another variation on Sujoy's answer. Just changed the variable names & added a namespace wrapper:

window.MyNamespace = window.MyNamespace  || {};
window.MyNamespace.Uri = window.MyNamespace.Uri || {};

(function (ns) {

    ns.SetQueryStringParameter = function(url, parameterName, parameterValue) {

        var otherQueryStringParameters = "";
        
        var urlParts = url.split("?");
        
        var baseUrl = urlParts[0];
        var queryString = urlParts[1];
        
        var itemSeparator = "";
        if (queryString) {
            
            var queryStringParts = queryString.split("&");
            
            for (var i = 0; i < queryStringParts.length; i++){
                
                if(queryStringParts[i].split('=')[0] != parameterName){
                    
                    otherQueryStringParameters += itemSeparator + queryStringParts[i];
                    itemSeparator = "&";
                }
            }
        }

        var newQueryStringParameter = itemSeparator + parameterName + "=" + parameterValue;
        
        return baseUrl + "?" + otherQueryStringParameters + newQueryStringParameter;
    };

})(window.MyNamespace.Uri);

Useage is now:

var changedUrl = MyNamespace.Uri.SetQueryStringParameter(originalUrl, "CarType", "Ford");

I too have written a library for getting and setting URL query parameters in JavaScript.

Here is an example of its usage.

var url = Qurl.create()
  , query
  , foo
  ;

Get query params as an object, by key, or add/change/remove.

// returns { foo: 'bar', baz: 'qux' } for ?foo=bar&baz=qux
query = url.query();

// get the current value of foo
foo = url.query('foo');

// set ?foo=bar&baz=qux
url.query('foo', 'bar');
url.query('baz', 'qux');

// unset foo, leaving ?baz=qux
url.query('foo', false); // unsets foo

I was looking for the same thing and found: https://github.com/medialize/URI.js which is quite nice :)

-- Update

I found a better package: https://www.npmjs.org/package/qs it also deals with arrays in get params.

No library, using URL() WebAPI (https://developer.mozilla.org/en-US/docs/Web/API/URL)

function setURLParameter(url, parameter, value) {
    let url = new URL(url);
    if (url.searchParams.get(parameter) === value) {
        return url;
    }
    url.searchParams.set(parameter, value);
    return url.href;
}

This doesn't work on IE: https://developer.mozilla.org/en-US/docs/Web/API/URL#Browser_compatibility

I know this is an old question. I have enhanced the function above to add or update query params. Still a pure JS solution only.

                      function addOrUpdateQueryParam(param, newval, search) {

                        var questionIndex = search.indexOf('?');

                        if (questionIndex < 0) {
                            search = search + '?';
                            search = search + param + '=' + newval;
                            return search;
                        }

                        var regex = new RegExp("([?;&])" + param + "[^&;]*[;&]?");
                        var query = search.replace(regex, "$1").replace(/&$/, '');

                        var indexOfEquals = query.indexOf('=');

                        return (indexOfEquals >= 0 ? query + '&' : query + '') + (newval ? param + '=' + newval : '');
                    }

my function support removing param

function updateURLParameter(url, param, paramVal, remove = false) {
		var newAdditionalURL = '';
		var tempArray = url.split('?');
		var baseURL = tempArray[0];
		var additionalURL = tempArray[1];
		var rows_txt = '';

		if (additionalURL)
			newAdditionalURL = decodeURI(additionalURL) + '&';

		if (remove)
			newAdditionalURL = newAdditionalURL.replace(param + '=' + paramVal, '');
		else
			rows_txt = param + '=' + paramVal;

		window.history.replaceState('', '', (baseURL + "?" + newAdditionalURL + rows_txt).replace('?&', '?').replace('&&', '&').replace(/\&$/, ''));
	}

I just wrote a simple module to deal with reading and updating the current url query params.

Example usage:

import UrlParams from './UrlParams'

UrlParams.remove('foo') //removes all occurences of foo=?
UrlParams.set('foo', 'bar') //set all occurences of foo equal to bar
UrlParams.add('foo', 'bar2') //add bar2 to foo result: foo=bar&foo=bar2
UrlParams.get('foo') //returns bar
UrlParams.get('foo', true) //returns [bar, bar2]

Here is my code named UrlParams.(js/ts):

class UrlParams {
    
    /**
     * Get params from current url
     * 
     * @returns URLSearchParams
     */
    static getParams(){
        let url = new URL(window.location.href)
        return new URLSearchParams(url.search.slice(1))
    }

    /**
     * Update current url with params
     * 
     * @param params URLSearchParams
     */
    static update(params){
        if(`${params}`){
            window.history.replaceState({}, '', `${location.pathname}?${params}`)
        } else {
            window.history.replaceState({}, '', `${location.pathname}`)
        }
    }

    /**
     * Remove key from url query
     * 
     * @param param string
     */
    static remove(param){
        let params = this.getParams()
        if(params.has(param)){
            params.delete(param)
            this.update(params)
        }
    }

    /**
     * Add key value pair to current url
     * 
     * @param key string
     * @param value string
     */
    static add(key, value){
        let params = this.getParams()
        params.append(key, value)
        this.update(params)
    }

    /**
     * Get value or values of key
     * 
     * @param param string
     * @param all string | string[]
     */
    static get(param, all=false){
        let params = this.getParams()
        if(all){
            return params.getAll(param)
        }
        return params.get(param)
    }

    /**
     * Set value of query param
     * 
     * @param key string
     * @param value string
     */
    static set(key, value){
        let params = this.getParams()
        params.set(key, value)
        this.update(params)
    }

}
export default UrlParams
export { UrlParams }

     // usage: clear ; cd src/js/node/js-unit-tests/01-set-url-param ; npm test ; cd -
     // prereqs: , nodejs , mocha
     // URI = scheme:[//authority]path[?paramName1=paramValue1&paramName2=paramValue2][#fragment]
     // call by: uri = uri.setUriParam("as","md")
     String.prototype.setUriParam = function (paramName, paramValue) {
        var uri = this
        var fragment = ( uri.indexOf('#') === -1 ) ? '' : uri.split('#')[1]
        uri = ( uri.indexOf('#') === -1 ) ? uri : uri.split('#')[0]
        if ( uri.indexOf("?") === -1 ) { uri = uri + '?&' }
        uri = uri.replace ( '?' + paramName , '?&' + paramName)
        var toRepl = (paramValue != null) ? ('$1' + paramValue) : ''
        var toSrch = new RegExp('([&]' + paramName + '=)(([^&#]*)?)')
        uri = uri.replace(toSrch,toRepl)
        if (uri.indexOf(paramName + '=') === -1 && toRepl != '' ) {
           var ampersandMayBe = uri.endsWith('&') ? '' : '&'
           uri = uri + ampersandMayBe + paramName + "=" + String(paramValue)
        }
        uri = ( fragment.length == 0 ) ? uri : (uri+"#"+fragment) //may-be re-add the fragment
        return uri
     }

     var assert = require('assert');
     describe('replacing url param value', function () {

        // scheme://authority/path[?p1=v1&p2=v2#fragment
        // a clean url
        it('http://org.com/path -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? with num value
        it('http://org.com/path?prm=src_v -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=57'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? but string value
        it('http://org.com/path?prm=src_v -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=boo-bar'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=boo-bar-baz'
           var uriActual = uri.setUriParam("bid","boo-bar-baz")
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ?& but string value
        it('http://org.com/path?&prm=src_v -> http://org.com/path?&prm=tgt_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? with other param
        it('http://org.com/path?prm=src_v&other_p=other_v -> http://org.com/path?&prm=tgt_v&other_p=other_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=5&other_p=other_v'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p=other_v'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ?& with other param
        it('http://org.com/path?&prm=src_v&other_p=other_v -> http://org.com/path?&prm=tgt_v&other_p=other_v', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5&other_p&other_v'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p&other_v'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ? with other param with fragment
        it('http://org.com/path?prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=5&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p=other_v#f'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // has the url param existing after the ?& with other param with fragment
        it('http://org.com/path?&prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5&other_p&other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=10&other_p&other_v#f'
           var uriActual = uri.setUriParam("bid",10)
           assert.equal(uriActual, uriExpected);
        });

        // remove the param-name , param-value pair
        it('http://org.com/path?prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?bid=5&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v#f'
           var uriActual = uri.setUriParam("bid",null)
           assert.equal(uriActual, uriExpected);
        });

        // remove the param-name , param-value pair
        it('http://org.com/path?&prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&bid=5&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v#f'
           var uriActual = uri.setUriParam("bid",null)
           assert.equal(uriActual, uriExpected);
        });

        // add a new param name , param value pair
        it('http://org.com/path?prm=src_v&other_p=other_v#f -> http://org.com/path?&prm=tgt_v&other_p=other_v#f', function (){
           var uri = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v#f'
           var uriExpected = 'http://site.eu:80/qto/view/devops_guide_doc?&other_p=other_v&bid=foo-bar#f'
           var uriActual = uri.setUriParam("bid","foo-bar")
           assert.equal(uriActual, uriExpected);
        });

     });