Some guy on Stack Overflow wanted to know how to highlight a piece of text in given page using jQuery. Finding proper solution for jQuery (client-side) took me around ten seconds as three most important search results were found on StackExchange and jQuery documentation itself. Anyway, here’s a copy of my answer.
In addition to “addClass, removeClass and hasClass without jQuery” article I wrote an example implementation of getElementsByClassName() method to catch a collection of objects, referencing them by their class name, when you can’t or don’t want to use jQuery and it’s superb class-selectors.
I’m continuing my plays with JavaScript and time functions (after this article). If you want to log-off user after some predefined time has passed, you can do this for example with below presented solution.
If you would like to present an information to your user on how much time did he or she spend on your webpage, then here is a particular example on how to do this the easiest way I found.
Read More “Count how much time user has spent on current page”
I found original version of this function at breakingpar.com. I have slightly changed function to fit my own purpose and purged original article of a really huge amount of completely unnecessary blah-blah, leaving actually Javascript code itself.
Class manipulation methods in jQuery are really handy, but when you need just them and nothing else out of jQuery, then using entire library seems like a little bit mistake. Using own versions of addClass, removeClass and hasClass sounds like a better idea and for this reason I have wrote following article, where you’ll find an example implementation of these methods.
Read More “addClass, removeClass and hasClass without jQuery”
A word about interaction between DOM objects in master view (website) and slave view (iframe).
Bear in mind that when writing JavaScript / jQuery code for handling user changes made to dropdown boxes, you must program your website reaction not only to onChange but also to onKeyPress events. Why? There is a rare situation, where user selects value by clicking dropdown and then using keyboard’s cursor up or cursor down keys. onKeyPress event will be fired in this situation instead of onChange event. And desired effect won’t work, if you put it only to onChange event handler.
Read More “Dropdown must use both onChange and onKeyPress events”
I’ve found a simple and cool JavaScript counter that is able to count current human population and it’s increase every second.
It:
In this particular (very old — year 1995) example result is printed into form’s text box. With a simple modifications you can have this turned into a actual JavaScript function to return result.
Read More “Human population counter”The quirksmode.org page has an article on creating, reading and removing cookies in pure Javascript. This blog post presents example codes from mentioned site. Just the pure codes, without a lot of blah-blah that original post contains.
Read More “Create, read and delete cookies without jQuery”This article discusses using of ternary operator, a very usful yet not so famous, logic operator (if counterpart) in Javascript, PHP and… Delphi. Alright, alright. Since Delphi sucks, it is only mentioned here.