Function to get Querystring Parameters

A JavaScript function to illicit the value for a parameter in a querystring. We can use JavaScript to get the various parameters from within a querystring. In the function given below I have used the JavaScript split function to break up the querystring into an array. I then use a dor loop to step through the array to find the required parameter. A second use of the split function will yield the value of the parameter

function getParameter( parameterName ) {
  var queryString = window.location.search.substring(1).toLowerCase();
  //alert(queryString);
  //if (queryString.length==0) {return "null";}
  var parameters = new Array();
  parameters = queryString.split('&');
  for(var i = 0; i < parameters.length; i++) {
    //alert(parameters[i]);
    //alert(parameters[i].indexOf(parameterName));
    if (parameters[i].indexOf(parameterName.toLowerCase())>=0) {
      //alert(parameters[i]);
      var parameterValue = new Array();
      parameterValue = parameters[i].split('=');
      return parameterValue[1];
    }
  }
  return "null";
}

var ModuleId = getParameter('ModuleId');

I have left in place some alerts, which may be uncommented to help you in testing your use of the function.

NAT March 2006