By default, Magento contains and uses the Prototype javascript library. You can also integrate the other most popular javascript library ‘jQuery‘ in your Magento site.
While integrating jQuery in Magento, you might get some javascript conflict and errors as you will be using two javascript libraries (prototype and jQuery) at a time. This is caused because prototype also uses ‘$‘ as a function or variable name, just as jQuery does.

Here is a quick code to get the current URL of a page with Javascript:-
var current_url = location.href;
Here is another way:-

It is very easy to execute some code after a specified time-interval, i.e. setting some time interval between the code. We can use the setTimeout function.
Here is the code:

It’s a real headache when you have to work on objects and arrays in Javascript. It would be lot easier to detect elements of the Javascript objects/arrays if we have print_r function in Javascript like we have in PHP.
I googled the web and have found a very efficient print_r Javascript function. Here is the code:-

Here, I will be demonstrating on showing or hiding a div when a link is clicked. I have done this with Javascript and CSS.
I have called showHideDiv() Js function when the link is clicked. The display of the div where content is present, is visible or hidden on each click. For this, CSS styling is used (display: none).

You can add html elements dynamically with Javascript. In this article, I will show you how to do so. I have created two Javascript functions. One for creating html elements and the other for removing them.
In my html elements, I have created ‘li’ and ‘strong’ elements inside ‘div’. The div id is ‘summary’. I have written comment in the code so that it would be easy to understand.

I had to work on multi-dimensional array with javascript and php. I had a multi-dimensional array in php. I had to load it into javascript array and then populate the html selection list.
The challenge for me was to create multi-dimensional array in javascript and populate selection list with for loop in javascript.