Append a param onto the current URL

Question

I'd like to have a little easter egg button in the corner of a project site. When clicked, it just drops a string onto the current url and reloads the page.

So if I'm on: http://test.com/projects/view/134

The button is clicked

Page reload on: http://test.com/projects/view/134?ts=true

Not really sure how I might go about doing so though.

Answer 1

I found the previous answers lacking and as such here is a method that better handles other parameters in current querystring

appendToQueryString = function (param, val) {
    var queryString = window.location.search.replace("?", "");
    var parameterListRaw = queryString == "" ? [] : queryString.split("&");
    var parameterList = {};
    for (var i = 0; i < parameterListRaw.length; i++) {
        var parameter = parameterListRaw[i].split("=");
        parameterList[parameter[0]] = parameter[1];
    }
    parameterList[param] = val;

    var newQueryString = "?";
    for (var item in parameterList) {
        if (parameterList.hasOwnProperty(item)) {
            newQueryString += item + "=" + parameterList[item] + "&";
        }
    }
    newQueryString = newQueryString.replace(/&$/, "");
    return location.origin + location.pathname + newQueryString;
}

You have to use location.href = appendToQueryString(ts, true) to actually reload the page.

Answer 2

Using:

• https://developer.mozilla.org/en-US/docs/Web/API/URL
• https://developer.mozilla.org/fr/docs/Web/API/URLSearchParams

Example:

var url = new URL("http://foo.bar/?x=1&y=2");

// If your expected result is "http://foo.bar/?x=1&y=2&x=42"
url.searchParams.append('x', 42);

// If your expected result is "http://foo.bar/?x=42&y=2"
url.searchParams.set('x', 42);

// Build result
url.toString();

Answer 3

Make full use of the location DOM API, and count in hash:

location.protocol + '//' + location.pathname + 
    (location.search ? location.search + '&a=b' : '?a=b') +
    location.hash;

Answer 4

try this code,

var separator = (window.location.href.indexOf("?")===-1)?"?":"&";
window.location.href = window.location.href + separator + "ts=true";

EDITS: to avoid duplicated parameter or very large string in your url, you need to replace the old param it already exists.

var url=window.location.href,
    separator = (url.indexOf("?")===-1)?"?":"&",
    newParam=separator + "ts=true";
    newUrl=url.replace(newParam,"");
    newUrl+=newParam;
    window.location.href =newUrl;

Answer 5

See the documentation of the history API :

https://developer.mozilla.org/en-US/docs/Web/API/History_API

Example of usage:

var obj = { Title: title, Url: url }; history.pushState(obj, obj.Title, obj.Url);

Answer 6

An improvement from @Bobbzorzen answer, with ability to delete param by passing its name only:

function AlterQueryString(param, val) {
    var queryString = window.location.search.replace("?", "");
    var parameterListRaw = queryString == "" ? [] : queryString.split("&");
    var parameterList = {};
    for (var i = 0; i < parameterListRaw.length; i++) {
        var parameter = parameterListRaw[i].split("=");
        if (typeof val != 'undefined') {
            parameterList[parameter[0]] = parameter[1];
        } else if (param != parameter[0]) {
            parameterList[parameter[0]] = parameter[1];
        }
    }
    if (typeof val != 'undefined') {
        parameterList[param] = val;
    }

    var newQueryString = Object.keys(parameterList).length > 0 ? "?" : "";
    for (var item in parameterList) {
        if (parameterList.hasOwnProperty(item)) {
            newQueryString += item + "=" + parameterList[item] + "&";
        }
    }
    newQueryString = newQueryString.replace(/&$/, "");
    return location.origin + location.pathname + newQueryString;
}

gist: https://gist.github.com/envil/bc1832503bef55ffdabb0cde32bb06f1