jenkins_queryargs.js

var getParamElements = () => Array.prototype.slice.call(document.querySelectorAll('.parameters div[name="parameter"]'));

var populateArgs = () => {
  if (getParamElements().length) {
    var match,
          pl     = /\+/g,  // Regex for replacing addition symbol with a space
          search = /([^&=]+)=?([^&]*)/g,
          decode = function (s) { return decodeURIComponent(s.replace(pl, " ")); },
          query  = window.location.search.substring(1);

      urlParams = {};
      while (match = search.exec(query))
         urlParams[decode(match[1])] = decode(match[2]);

    getParamElements().forEach(el => {
      var nameEl = el.querySelector('[name="name"]');
      var valueEl = el.querySelector('[name="value"]');
      if (urlParams.hasOwnProperty(nameEl.value)) {
        valueEl.value = urlParams[nameEl.value];
      }
    });
  } else {
    setTimeout(populateArgs, 250);
  }
};
  
window.addEventListener('ready', populateArgs);