How can I include special characters in query strings?

In JavaScript you can use the encodeURI() function.

ASP has the Server.URLEncode() function.

You can use HttpServerUtility.UrlEncode in .NET.

You need to encode the query parameters before combining them to form a url. The function needed here is encodeURIComponent.For example,

the url you need to create is:

http://localhost/mysite/mypage?param=a=?&b=/

Now, assuming that ? and / comes as variables, you need to encode them before putting in the url. So lets create your url using this function(I am expecting two query parameters):

 var q1 = "a=?"; //came from some input or something
    var q2 = "/"; //came from somewhere else

    var faultyUrl =  "http://localhost/mysite/mypage?param="+ q1 +"&b=" + q2; 
// "http://localhost/mysite/mypage?param=a=?&b=/"


    var properUrl =  "http://localhost/mysite/mypage?param="+ encodeURIComponent(q1) +"&b=" + encodeURIComponent(q2); 
//"http://localhost/mysite/mypage?param=a%3D%3F&b=%2F"

This function is in basic JS and supported in all the browsers.

Easy way to pass QueryString value with special character using javascript:

var newURL=encodeURIComponent(uri);
window.location="/abc/abc?q="+newURL;

You have to encode special characters in URLs. See: http://www.w3schools.com/tags/ref_urlencode.asp