JavaScript Get URL Parameters

In this JavaScript tutorial article, the author shows you 2 JavaScript solutions (small JavaScript codes) to get current JavaScript URL parameters. They're very easy to try and use, let check them by yourself.

Perhaps you would like to check more our JavaScript tutorials:
- Current Document URL Displayer
- Obtaining the URL of the Referring Document

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I found 2 simple solutions to reading GET variables with JavaScript.
They use either 'document.location' or 'window.location.href' to ready the URL and split it.

The first example I found here:

function getURLVar(urlVarName) {
    //divide the URL in half at the '?'
    var urlHalves = String(document.location).split('?');
    var urlVarValue = '';
    if(urlHalves[1])
    {
        //load all the name/value pairs into an array
        var urlVars = urlHalves[1].split('&');
        //loop over the list, and find the specified url variable
        for(i=0; i<=(urlVars.length); i++)
        {
            if(urlVars[i])
            {
                //load the name/value pair into an array
                var urlVarPair = urlVars[i].split('=');
                if (urlVarPair[0] && urlVarPair[0] == urlVarName)
                {
                    //I found a variable that matches, load it's value into the return variable
                    urlVarValue = urlVarPair[1];
                }
            }
        }
    }
    return urlVarValue;
}
 
document.write('name = ' + getURLVar('name'));

The 2nd I found here. This one is a bit more simple.

function getUrlVars()
{
    var vars = [], hash;
    var hashes = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for(var i = 0; i < hashes.length; i++)
    {
        hash = hashes[i].split('=');
        vars.push(hash[0]);
        vars[hash[0]] = hash[1];
    }
    return vars;
}
 
var getvars = getUrlVars();
 
document.write('name = ' + getvars['name']);

I don't really like this solution because you get 'undefined' if you select a variable that does not exist. But that may be what you want to see if a variable is present in the URL.

I simplified the first example using the slice/split idea from the 2nd example and came up with a better solution:

function getURLVar(urlVarName) {
    var urlVars = window.location.href.slice(window.location.href.indexOf('?') + 1).split('&');
    for(i=0; i<=(urlVars.length); i++)
    {
        if(urlVars[i])
        {
            var urlVarPair = urlVars[i].split('=');
            if (urlVarPair[0] && urlVarPair[0] == urlVarName)
            {
                return urlVarPair[1];
            }
        }
    }
    return "";  // Remove this if you want it to return 'undefined' when a variable does not exist in the URL.
}
 
document.write('name = ' + getURLVar('name'));

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