How can I get URI parameters - query string with JavaScript?

Question

I am new at using javascript. For example, I have following url: index.jsp?page=home&lang=eng how can I extract parameters home and eng from the above url?

Question also answered: How can I get query string values in JavaScript?

• Sudhir Bastakoti: why would you need ajax for that..? Or did i get you wrong..!
• Amy: I think he means JavaScript. Some people use that term interchangeably.....
• Afsun Khammadli: I can get parameters by using request.getParameter() with java but I want to do that with jquery
• JJJ: possible duplicate of How can I get query string values?
• OQJF: You mean use ajax to get string values? not js?

Answer 1

To parse an url's parameters:

var url = 'index.jsp?page=home&lang=eng';
var parse = function (url) {
 var getQuery = url.substring(url.indexOf('?') + 1);
 var parts = getQuery.split('&');
 var key = null;
 var value = null;
 var result = {};
 for (var i = 0; i < parts.length; i++) {
 var keyValue = parts[i].split('=');
 key = keyValue[0];
 value = keyValue[1];
 result[key] = value;
 }
 return result;
};

The output of parse(url) would be an object that has the following structure:

{
 page: "home",
 lang: "eng"
}

Answer 2

Easy way to extract the exact URL param you want and will return "" empty string when can't find the paramter you search for:

function getUrlParam(param){
 var value = decodeURIComponent(
 (RegExp(param + '=' + '(.+?)(&|$)').exec(location.search)||["",""])[1]);
 return value;
} 
page_value = getUrlParam("page"); // home
lang_value = getUrlParam("lang"); // eng