bbo/delete_url_param.js

bbo is a utility library of zero dependencies for javascript.

'use strict';

/**
 * getUrlParam / deleteUrlParam
 * From https://stackoverflow.com/questions/901115/how-can-i-get-query-string-values-in-javascript
 */
var deleteUrlParam = function (param) {
  var url = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : window.location.href;
  // prefer to use l.search if you have a location/link object
  var urlparts = url.split('?');

  if (urlparts.length >= 2) {
    var prefix = encodeURIComponent(param) + '=';
    var pars = urlparts[1].split(/[&;]/g); // reverse iteration as may be destructive

    for (var i = pars.length; i-- > 0;) {
      // idiom for string.startsWith
      if (pars[i].lastIndexOf(prefix, 0) !== -1) {
        pars.splice(i, 1);
      }
    }

    return urlparts[0] + (pars.length > 0 ? '?' + pars.join('&') : '');
  } else {
    return url;
  }
};

module.exports = deleteUrlParam;