Posts Tagged ‘tutorial’

Introducing JSnip

JSnip Sample

JSnip Sample Page

GITHub and GIT seems to be all the rage these days so I decided it was about time I got myself an account and figured out what all the fuss was about. My problem with this plan was that I had nothing worthwhile to use it with. To solve this issue I finally got around to creating something that I’ve been contemplating making for a while now. I like to call it JSnip.

JSnip is a lightweight JavaScript based Snipping package, aimed at those who want to add interactive elements to their webpages but lack the necessary JavaScript knowledge to do so.

If you know basic HTML then useing JSnip should be a snap. Just upload the JSnip.js and JSnip.css files to your server, import them in the head of your HTML document; probably using something along the lines of:

<link rel='stylesheet' href='jsnip.css' type='text/css' />
<script type="text/javascript" src='jsnip.js'></script>

and JSnip is ready to go.

Adding Snippets to your page is as simple as adding a class name to an element. In fact that’s actually all you need to do. If you want a showHide box for instance, just type out something like:

<div class='jsnipShowHide' title='Title for your ShowHide' >
Show Hide Content

and you’ll get:

Show Hide Content

Now, if you wanted the ShowHide to be open by default, all you would need to do is add an data-mode of “open” to the tag. Thus:

<div class='jsnipShowHide' title='Title for your ShowHide' data-mode='open' >
Show Hide Content

will produce:

Show Hide Content

Adding Tabs is no more difficult, a basic set of Tabs for example need consist of no more code than:

<div class='jsnipTabs'>
		<h2>Tab 1</h2>
		Tab 1 Content! Add tab one content here.
		<h2>Tab 2</h2>
		Tab 2 Content! Add tab two content here.
		<h2>Tab 3</h2>
		Tab 3 Content! Add tab 3 content here.

to create a Tabs box such as the one below.

Tab 1

Tab 1 Content! Add tab one content here.

Tab 2

Tab 2 Content! Add tab two content here.

Tab 3

Tab 3 Content! Add tab 3 content here.

The image switcher snippet as seen in one of my past tutorials has also made it into JSnip. Thus a list of images can be transformed

<div class="jsnipImageSwitcher" style="width: 400px;">
    <img src="/demo/img/skunk.jpg" alt="A baby skunk!" />
    <img src="/demo/img/otter.jpg" alt="An otter" />
    <img src="/demo/img/bunny.jpg" alt="A Bunny Rabbit" />

into this, with only the above code.

A baby skunk!An otterA Bunny Rabbit

Check out the Sample page to see how these snippets can be used together on a page.

The provided snippets are all nestable so they can be placed inside one another as much as you please, along with any other HTML you wish to add. A nice example of this is if you wanted to make the images in an ImageSwitcher link to a number of other webpages. All you would need to do is wrap the relevant image in a standard A tag pointed at where you want it to go.

The CSS behind the snippets can easily swapped out or modified to fit in with your own layout (as the snippets have been for this blog for instance), making the snippets simple to customise.

For anyone interested in the code, you can view it on my GitHub repo. I shall be creating another blog article soon, aimed at developers, explaining how it all works behind the scenes.

I’d be more then happy to answer any questions you may have in the comments section below.

Thanks for reading,

Create a mobile version of your site with just CSS!

A few week’s or so back Luke was showing off his new Responsive CV at work, which had the rather cool feature of instantly resizing itself to fit pretty much any screen size – even mobile. The magic behind all this, rather than any nifty bit of JavaScript, tuned out to be CSS Media Queries, a CSS feature I’d never really paid much attention to beforehand.

The basic idea behind CSS Media Queries is to give web developers the power to tell the browser to apply extra CSS when certain conditions are met. The most useful condition in regards to creating a mobile version of your site website the being browser width’s. As a rough example of how they work, imagine for example you have a website with a default width of 1000px and a user then resizes their browser window to 950px wide.

Using the following code snippet, once the users browser window has been resized to below 1000px the enclosed CSS will be instantly applied to the page, changing the containers width to 900.

@media only screen and (max-width: 1000px) {
	#container {width:900px !important; }

The real advantage’s of Media Queries over a standard fluid layout start to show up when you get to the significantly different screen resolutions, for example the 320px width of a mobile phone browser. Since Media Queries allow you to selectively apply whole chunks of additional CSS, you can use it to totally rearrange elements on the page in order to ensure your site remains functional at any resolution. Have a go at resizing this site for instance, the first big change to happen is the removal of the sidebar (at 720px), which coincides with the search bar being moved up to the top. The next big one happens when the site is transformed fully in to the mobile site (at 450px) which has quite substantially different styling to the normal view.

If you want to apply your mobile site CSS to any screen resolution below 350px, your code my look something like this.

@media only screen and (max-width: 350px) {
	#container {width:320px !important; }
	/* Mobile Site CSS here */

Or, if you want to resize headings on any resolution between 600px and 800px, your code may be as follows:

@media only screen and (min-width: 600px) and (max-width: 800px) {
	h1 {font-size:0.0em;}
	/* More styles */

As you can see, using this technique it becomes relatively straight forward (assuming you already have a good grasp of CSS) to create a mobile version of your site by just altering and adjusting a few of its styles.

One thing you may notice though, is that even if your Mobile Site styles work fine when you resize your browser window to the correct size, your actual mobile phone’s browser still shows the desktop version.

In order to get your mobile CSS styles to be applied correctly, its important to tell the mobile browser that you want everything rendered at its real size (as opposed to the zoomed out view they normally try to adopt when encountering desktop sites).

To do this, you’ll need to ad a veiwport meta tag to your websites header;

<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />

Once that’s done your mobile CSS should start showing up on your phone just as you would expect it to.

Having only recently added CSS Media Queries to this site, I’m still incredibly impressed with them. CSS Media Queries turn the rather substantial job of creating an alternate mobile friendly version of your site in to about half an hour’s CSS. Awesome, no?

JavaScript eyes that follow the cursor.

I remember one of the first tutorials I wrote back on my old thybag website was on how to get eyes that follow the cursor using Flash. I’d initially worked out how to do it in order to animate the alien in my banner a little and although the effect can be a little disconcerting at times, I kinda liked it.

For that reason I decided to set myself the challenge of getting the functionality back, only this time using JavaScript instead of flash. Rather than waste space with extra images I also decided I may as well draw the eyes with canvas while I was at it.

The aim of this little tutorial will be to show you how to create something like this.
(Though you will more likely want to use your own image.)

If your not really intested in how its done and just want the script, feel free to grab it from here. You can create eye’s by calling

//Variables are just used to make it obvious what each parameter is, 
//you can call the functions with the param's directly if you prefer.
var positionFromLeft = 200;
var positionFromTop = 50;
var eyeSize = 30;
var appendEyetoDivNamed = 'mydiv';
new alienEye(positionFromLeft,positionFromTop,eyeSize,appendEyetoDivNamed);

If your interested to see how the eyes following the cursor script works, keep reading after the jump.

Read the rest of this post »

Image-switcher snippet

Since my plan today was to start working on creating the portfolio/past work section of this site, I decided to start by creating a few simple snippets that I thought would likely come in handy.

The first of these being a simple image switcher. The idea behind the snippet was pretty much to just be able to put some images inside a div with a particular class and have the snippet do all the work. A little bit of dojo later and the below is the result.

A baby skunk!An otterA Bunny RabbitUpside down SealA Kitten sleeping next to a big dog

(images “borrowed” from the interweb)

To use the snippet all you need to add Dojo to the page, then import the jsnippet CSS and JavaScript files. After that just add a div to the page with the class “jsnipImageSwitcher”. The above Image switcher for instance is actually just the following HTML wirtten in to the page.

<div class="jsnipImageSwitcher" style="width: 400px;">
    <img src="/demo/img/skunk.jpg" alt="A baby skunk!" />
    <img src="/demo/img/otter.jpg" alt="An otter" />
    <img src="/demo/img/bunny.jpg" alt="A Bunny Rabbit" />
    <img src="/demo/img/seal.jpg" alt="Upside down Seal" />
    <img src="/demo/img/kittendog.jpg" alt="A Kitten sleeping next to a big dog" />

The snippet will work out the amount of images dynamically so there are no limits to how many can be used within it. The only limitation to the above being that the default styles may not leave room to fit the dots. As you may have noticed the snippet also pulls it’s caption from the images alt attribute, which has the added bonus of improving the images ability to be found by search.

If for any reason JavaScript is not enabled in a user’s browser the images will display normally without any side-effects as a result of being part of the snippet. The snippet is tested in Firefox, Chrome and IE9.

If your interested in knowing how the snippet works, keep reading after the jump for a full explanation.

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