Quick Tip: Get URL Parameters with JavaScript

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Quick Tip: Get URL Parameters with JavaScript

So you want to get a parameter from a URL? URL parameters (also called query string parameters or URL variables) can have lots of useful data including product info, user preferences, link referrals, and more.

Let's get started!

Getting URL Parameters

Let's say you have the following url:

http://example.com/?product=shirt&color=blue&newuser&size=m

Here's a function to give you all the URL parameters as a neat object:

function getAllUrlParams(url) { // get query string from url (optional) or window var queryString = url ? url.split('?')[1] : window.location.search.slice(1); // we'll store the parameters here var obj = {}; // if query string exists if (queryString) { // stuff after # is not part of query string, so get rid of it queryString = queryString.split('#')[0]; // split our query string into its component parts var arr = queryString.split('&'); for (var i=0; i<arr.length; i++) { // separate the keys and the values var a = arr[i].split('='); // in case params look like: list[]=thing1&list[]=thing2 var paramNum = undefined; var paramName = a[0].replace(/\[\d*\]/, function(v) { paramNum = v.slice(1,-1); return ''; }); // set parameter value (use 'true' if empty) var paramValue = typeof(a[1])==='undefined' ? true : a[1]; // (optional) keep case consistent paramName = paramName.toLowerCase(); paramValue = paramValue.toLowerCase(); // if parameter name already exists if (obj[paramName]) { // convert value to array (if still string) if (typeof obj[paramName] === 'string') { obj[paramName] = [obj[paramName]]; } // if no array index number specified... if (typeof paramNum === 'undefined') { // put the value on the end of the array obj[paramName].push(paramValue); } // if array index number specified... else { // put the value at that index number obj[paramName][paramNum] = paramValue; } } // if param name doesn't exist yet, set it else { obj[paramName] = paramValue; } } } return obj; }

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