url encode & decode parameter and read parameter

Question

i success encode & decode the url parameter but how can i get the parameter after decode?? the reason i encode all query strings into a parameter just to prevent user change the parameter on the address bar.

For example

Page A

  function fnlink()
    {
        param1 = encodeURIComponent("INSCODE=91&NAME=LEE&EMAIL=abc");
    url = "/home/test/test2.jsp?"+param1;

    location.href= url; 
    }

Page B

url : http://localhost:9080/home/test/test2.jsp?INSCODE%3D91%26NAME%3DLEE%26EMAIL%3Dabc

Possible duplicate of Parse a URI String into Name-Value Collection — Klitos Kyriacou
– Klitos Kyriacou, Commented Mar 6, 2017 at 14:03
stackoverflow.com/questions/13592236/… shows you how to use URL.getQuery to extract the query part and then use String.split to get the individual parts into a map. Then use the map's methods to check & get values for specific parameters. — Klitos Kyriacou
– Klitos Kyriacou, Commented Mar 6, 2017 at 14:05
The method getParameter of request object returns the parameter you're looking already decoded. Not clear what's your problem. — freedev
– freedev, Commented Mar 6, 2017 at 14:05
@freedev getParameter is a method that the OP wished existed. — Klitos Kyriacou
– Klitos Kyriacou, Commented Mar 6, 2017 at 14:07
Just so you are aware.. You are appending the QueryString parameters wrong. It should be: request.getRequestURL() + "?" + request.getQueryString().. Note the question mark. — Brandon
– Brandon, Commented Mar 6, 2017 at 14:17

Community · Accepted Answer · 2017-05-23 10:30:08Z

2

You should not encode the entire parameters string "INSCODE=91&NAME=LEE&EMAIL=abc" with encodeURIComponent.

Each parameter should be encoded separately. Use a Javascript function like this to add your parameters at query string:

/**
* Add a URL parameter 
* @param {url}   string  url 
* @param {param} string  the key to set
* @param {value} string  value 
*/
var addParam = function(url, param, value) {
   param = encodeURIComponent(param);
   var a = document.createElement('a');
   param += (value ? "=" + encodeURIComponent(value) : ""); 
   a.href = url;
   a.search += (a.search ? "&" : "") + param;
   return a.href;
}

edited May 23, 2017 at 10:30

CommunityBot

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answered Mar 6, 2017 at 14:09

freedev

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1 Comment

user3835327 Over a year ago

i tried this method, my parameter did not encode .. when redirect my parameter still show exact parameter ..

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