How to pass a parameter to a javascript through a url and display it on a page?

For instance, I have a url like this : www.mysite.com/my_app.html

How do I pass a value " Use_Id = abc " to it and use javascript to display on that page ?

Answers:

Answer

Shouldn't be too difficult to write your own without the need for an external library.

// www.mysite.com/my_app.html?Use_Id=abc 

var GET = {};
var query = window.location.search.substring(1).split("&");
for (var i = 0, max = query.length; i < max; i++)
{
    if (query[i] === "") // check for trailing & with no param
        continue;

    var param = query[i].split("=");
    GET[decodeURIComponent(param[0])] = decodeURIComponent(param[1] || "");
}

Usage: GET.Use_id or GET["Use_id"]. You can also check if a parameter is present even if it has a null value using "Use_id" in GET (will return true or false).

Answer

Call the page www.mysite.com/my_app.html?Use_Id=abc

Then in that page use a javascript function like:

var urlParam = function(name, w){
    w = w || window;
    var rx = new RegExp('[\&|\?]'+name+'=([^\&\#]+)'),
        val = w.location.search.match(rx);
    return !val ? '':val[1];
}

To use it:

var useId = urlParam('Use_Id');

The second parameter w is optional, but useful if you want to read parameters on iframes or parent windows.

Answer

www.mysite.com/my_app.html?use_id=abs

var qs = new QueryString()

// use_id is now available in the use_id variable
var use_id = qs.get("use_id");

Get the QueryString() code here

Answer
www.mysite.com/my_app.html?Use_Id=abc


var querystring = window.location.querystring;
var myValue = querystring["Use_Id"];

UPDATE: Link to library (thanks @Andy E), http://prettycode.org/2009/04/21/javascript-query-string/

Answer

There's a similar question on this here What is the easiest way to read/manipulate query string params using javascript?

Which seems to recommend using jQuery's Querystring plugin: http://plugins.jquery.com/project/query-object

Answer

Your server side script could read the value and set it in a hidden form field which your JS could then read.

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