Javascript is a programming or scripting language primarily used for client-sided programming in web browsers. It can also be used as a server-side programming language but this is generally used less often. Javascript was originally created by Netscape for their browser Netscape Navigator, and is now an implementation of the ECMAScript standard. It is typically used in web browsers for form validation, floating navigation, AJAX and other nifty things to make web pages more interactive.
My last jQuery post looked at how to get the mouse co-ordinates with jQuery as the mouse moves around the page or over a particular element. This post looks at how to get the mouse co-ordinates when an element is clicked.
jQuery’s mousemove function can be used to track the mouse x and y co-ordinates either for an entire document or just when mousing over a particular element.
There may be times when a static variable is needed in a Javascript function; static variables maintain their value between function calls and are tidier than using a global variable because they cannot be modified outside of the function.
I’ve previously posted about minifying Javascript using a PHP port of Douglas Crockford’s JSMin Javascript minifier but learned today of the YUI Compressor which does an even better job of minifying by replacing local symbols with 1 letter symbol names and other optimizations. It is also able to compress CSS files.
jQuery’s $(document).ready() function runs the code within that function after the DOM is loaded (I’ve written about this previously here). Something I haven’t needed to do before, but was wondering if it’s possible, is to use $(document).ready() more than once.
jQuery makes it easy to determine if an element is visible or hidden with the is() function. This post shows some examples of how to do this and also how to loop through each of the visible or hidden elements.