How to replace url parameter with javascript/jquery?

Question

I've been looking for an efficient way to do this but haven't been able to find it, basically what I need is that given this url for example:

http://localhost/mysite/includes/phpThumb.php?src=http://media2.jupix.co.uk/v3/clients/4/properties/795/IMG_795_1_large.jpg&w=592&aoe=1&q=100

I'd like to be able to change the URL in the src parameter with another value using javascript or jquery, is this possible?

Thanks in advance.

Answer 1

Wouldn't this be a better solution?

var text = 'http://localhost/mysite/includes/phpThumb.php?src=http://media2.jupix.co.uk/v3/clients/4/properties/795/IMG_795_1_large.jpg&w=592&aoe=1&q=100';
var newSrc = 'www.google.com';
var newText = text.replace(/(src=).*?(&)/,'$1' + newSrc + '$2');

EDIT:

added some clarity in code and kept 'src' in the resulting link

$1 represents first part within the () (i.e) src= and $2 represents the second part within the () (i.e) &, so this indicates you are going to change the value between src and &. More clear, it should be like this:

src='changed value'& // this is to be replaced with your original url

ADD-ON for replacing all the ocurrences:

If you have several parameters with the same name, you can append to the regex global flag, like this text.replace(/(src=).*?(&)/g,'$1' + newSrc + '$2'); and that will replaces all the values for those params that shares the same name.

Answer 2

The following solution combines other answers and handles some special cases:

• The parameter does not exist in the original url
• The parameter is the only parameter
• The parameter is first or last
• The new parameter value is the same as the old
• The url ends with a ? character
• \b ensures another parameter ending with paramName won't be matched

Solution:

function replaceUrlParam(url, paramName, paramValue)
{
    if (paramValue == null) {
        paramValue = '';
    }
    var pattern = new RegExp('\\b('+paramName+'=).*?(&|#|$)');
    if (url.search(pattern)>=0) {
        return url.replace(pattern,'$1' + paramValue + '$2');
    }
    url = url.replace(/[?#]$/,'');
    return url + (url.indexOf('?')>0 ? '&' : '?') + paramName + '=' + paramValue;
}

Known limitations:

• Does not clear a parameter by setting paramValue to null, instead it sets it to empty string. See https://stackoverflow.com/a/25214672 if you want to remove the parameter.

Answer 3

Javascript now give a very useful functionnality to handle url parameters: URLSearchParams

var searchParams = new URLSearchParams(window.location.search);
searchParams.set('src','newSrc')
var newParams = searchParams.toString()

Answer 4

Nowdays that's possible with native JS

var href = new URL('https://google.com?q=cats');
href.searchParams.set('q', 'dogs');
console.log(href.toString()); // https://google.com/?q=dogs

Answer 5

Here is modified stenix's code, it's not perfect but it handles cases where there is a param in url that contains provided parameter, like:

/search?searchquery=text and 'query' is provided.

In this case searchquery param value is changed.

Code:

function replaceUrlParam(url, paramName, paramValue){
    var pattern = new RegExp('(\\?|\\&)('+paramName+'=).*?(&|$)')
    var newUrl=url
    if(url.search(pattern)>=0){
        newUrl = url.replace(pattern,'$1$2' + paramValue + '$3');
    }
    else{
        newUrl = newUrl + (newUrl.indexOf('?')>0 ? '&' : '?') + paramName + '=' + paramValue
    }
    return newUrl
}

Answer 6

UpdatE: Make it into a nice function for you: http://jsfiddle.net/wesbos/KH25r/1/

function swapOutSource(url, newSource) {
    params = url.split('&');
    var src = params[0].split('=');
    params.shift();
    src[1] = newSource;
    var newUrl = ( src.join('=') + params.join('&')); 
    return newUrl; 
}

Then go at it!

var newUrl = swapOutSource("http://localhost/mysite/includes/phpThumb.php?src=http://media2.jupix.co.uk/v3/clients/4/properties/795/IMG_795_1_large.jpg&w=592&aoe=1&q=100","http://link/to/new.jpg");


console.log(newUrl);

Answer 7

If you look closely you'll see two surprising things about URLs: (1) they seem simple, but the details and corner cases are actually hard, (2) Amazingly JavaScript doesn't provide a full API for making working with them any easier. I think a full-fledged library is in order to avoid people re-inventing the wheel themselves or copying some random dude's clever, but likely buggy regex code snippet. Maybe try URI.js (http://medialize.github.io/URI.js/)

Answer 8

I have get best solution to replace the URL parameter.

Following function will replace room value to 3 in the following URL.

http://example.com/property/?min=50000&max=60000&room=1&property_type=House

var newurl = replaceUrlParam('room','3');
history.pushState(null, null, newurl);

---

function replaceUrlParam(paramName, paramValue){
    var url = window.location.href;

    if (paramValue == null) {
        paramValue = '';
    }

    var pattern = new RegExp('\\b('+paramName+'=).*?(&|#|$)');
    if (url.search(pattern)>=0) {
        return url.replace(pattern,'$1' + paramValue + '$2');
    }

    url = url.replace(/[?#]$/,'');
    return url + (url.indexOf('?')>0 ? '&' : '?') + paramName + '=' + paramValue;
}

Output

http://example.com/property/?min=50000&max=60000&room=3&property_type=House

Answer 9

In addition to @stenix, this worked perfectly to me

 url =  window.location.href;
    paramName = 'myparam';
        paramValue = $(this).val();
        var pattern = new RegExp('('+paramName+'=).*?(&|$)') 
        var newUrl = url.replace(pattern,'$1' + paramValue + '$2');
        var n=url.indexOf(paramName);
        alert(n)
        if(n == -1){
            newUrl = newUrl + (newUrl.indexOf('?')>0 ? '&' : '?') + paramName + '=' + paramValue 
        }
        window.location.href = newUrl;

Here no need to save the "url" variable, just replace in current url

Answer 10

How about something like this:

<script>
function changeQueryVariable(keyString, replaceString) {
    var query = window.location.search.substring(1);
    var vars = query.split("&");
    var replaced = false;
    for (var i = 0; i < vars.length; i++) {
        var pair = vars[i].split("=");
        if (pair[0] == keyString) {
            vars[i] = pair[0] + "="+ replaceString;
            replaced = true;
        }
    }
    if (!replaced) vars.push(keyString + "=" + replaceString);
    return vars.join("&");
}
</script>

Answer 11

try this

var updateQueryStringParam = 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 == '' ) { // Remove param if value is empty
            params = urlQueryString.replace(removeRegex, "$1");
            params = params.replace( /[&;]$/, "" );

        } else if (urlQueryString.match(updateRegex) !== null) { // If param exists already, update it
            params = urlQueryString.replace(updateRegex, "$1" + newParam);

        } else { // Otherwise, add it to end of query string
            params = urlQueryString + '&' + newParam;
        }
    }

    // no parameter was set so we don't need the question mark
    params = params == '?' ? '' : params;

    window.history.replaceState({}, "", baseUrl + params);
};

Answer 12

I use this method which:

• replace the url in the history

• return the value of the removed parameter

  function getUrlParameterAndRemoveParameter(paramName) {
      var url = window.location.origin + window.location.pathname;
      var s = window.location.search.substring(1);
      var pArray = (s == "" ? [] : s.split('&'));
  
      var paramValue = null;
      var pArrayNew = [];
      for (var i = 0; i < pArray.length; i++) {
          var pName = pArray[i].split('=');
          if (pName[0] === paramName) {
              paramValue = pName[1] === undefined ? true : decodeURIComponent(pName[1]);
          }
          else {
              pArrayNew.push(pArray[i]);
          }
      }
  
      url += (pArrayNew.length == 0 ? "" : "?" + pArrayNew.join('&'));
      window.history.replaceState(window.history.state, document.title, url);
  
      return paramValue;
  }