Articles Tagged with ajax
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How to Create a Scrolling Twitter Feed Using jQuery
Published Friday 24th of June 2011
In this tutorial I'll explain how to create one of those scrolling twitter feed boxes that are quite common on many websites today.
I'll be using jQuery as well as Remy Sharp's Silky Smooth Marquee plug-in.
The HTML
Most of the code will be generated with JS. But we'll add a container and a little "Loading..."-text directly in the HTML.
<div id="twitter">
<h2>Latest tweets</h2>
<p>Loading...</p>
<noscript>This feature requires JavaScript</noscript>
</div>I'll also use the noscript element to inform users without JS that they need to turn it on in order to see the tweets.
You could fetch the tweets using PHP and CURL but that makes your entire page halt until the tweets are loaded so I prefer the JS-approach.
The CSS
You can style it any way you like really but this CSS will make it look kind of like in the image above.
/* The container for the module */
#twitter {
background: #f1f2f8;
width: 600px; /* Up to you but remember to change the div width below as well if you change it */
padding: 0 10px;
overflow: hidden; /* clearfix */
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
-o-border-radius: 5px;
-ms-border-radius: 5px;
border-radius: 5px;
}
#twitter h2 {
float: left; /* We'll make the heading sit on its own line next to the tweets */
width: 85px; /* Might wanna change this depending on the text in the heading */
margin: 0;
padding: 6px 0; /* I'll set the top and bottom padding here rather than in the container so as not to cut off any text */
font-size: 12px;
color: #4b9fff;
line-height: 1;
}
/* The marquee plug-in turns a marquee element into a div */
#twitter p,
#twitter marquee,
#twitter div {
float: left;
width: 505px; /* Container width - heading width - 10px (for some right padding) */
margin: 0;
padding: 6px 0; /* Again we set the padding in here so as not to cut text */
line-height: 1;
}
/* All the tweets will be links pointing to your page on twitter */
#twitter marquee a,
#twitter div a {
margin: 0 10px 0 0;
color: #333;
text-decoration: none;
}
/* The i is used to display the date of the tweet */
#twitter marquee a i,
#twitter div a i {
font-style: normal;
color: #999;
}The JavaScript
Now for the interesting bits.
var Twitter = {
init: function () {
// Pass in the username you want to display feeds for
this.insertLatestTweets('realjknoxville');
},
// This replaces the <p>Loading...</p> with the tweets
insertLatestTweets: function (username) {
var limit = 5; // How many feeds do you want?
var url = 'http://twitter.com/statuses/user_timeline.json?screen_name=' + username + '&count=' + limit + '&callback=?';
// Now ajax in the feeds from twitter.com
$.getJSON(url, function (data) {
// We'll start by creating a normal marquee-element for the tweets
var html = '<marquee behavior="scroll" scrollamount="1" direction="left">';
// Loop through all the tweets and create a link for each
for (var i in data) {
html += '<a href="http://twitter.com/' + username + '#status_' + data[i].id_str + '">' + data[i].text + ' <i>' + Twitter.daysAgo(data[i].created_at) + '</i></a>';
}
html += '</marquee>';
// Now replace the <p> with our <marquee>-element
$('#twitter p').replaceWith(html);
// The marquee element looks quite shite so we'll use Remy Sharp's plug-in to replace it with a smooth one
Twitter.fancyMarquee();
});
},
// Replaces the marquee-element with a fancy one
fancyMarquee: function () {
// Replace the marquee and do some fancy stuff (taken from remy sharp's website)
$('#twitter marquee').marquee('pointer')
.mouseover(function () {
$(this).trigger('stop');
})
.mouseout(function () {
$(this).trigger('start');
})
.mousemove(function (event) {
if ($(this).data('drag') == true) {
this.scrollLeft = $(this).data('scrollX') + ($(this).data('x') - event.clientX);
}
})
.mousedown(function (event) {
$(this).data('drag', true).data('x', event.clientX).data('scrollX', this.scrollLeft);
})
.mouseup(function () {
$(this).data('drag', false);
});
},
// Takes a date and return the number of days it's been since said date
daysAgo: function (date) {
// TODO: Fix date for IE...
if ($.browser.msie) {
return '1 day ago';
}
var d = new Date(date).getTime();
var n = new Date().getTime();
var numDays = Math.round(Math.abs(n - d) / (1000 * 60 * 60 * 24));
var daysAgo = numDays + ' days ago';
if (numDays == 0) {
daysAgo = 'today';
}
else if (numDays == 1) {
daysAgo = numDays + ' day ago';
}
return daysAgo;
}
};
Twitter.init();And there you have it. View the scrolling twitter feed in action here.
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How to Build an aFramework Module
Published Friday 16th of April 2010
As a follow up to "How aFramework Works" I thought I'd explain how to build your own modules for aFramework.
It's actually very simple. Of course you'll need to know the languages you'll be writing but I assume you do. The simplest modules consist of nothing but HTML.
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Super Simple Ajax (Without a Framework)
Published Friday 12th of June 2009
If you're looking for the bare minimum when it comes to doing cross-browser GET or POST XHR then this might be the script for you.
I know there's hundreds (probably thousands) of these scripts out there already but even the most lightweight ones I could find seemed kind of bloated.
Example
// GET latest-comments.php and update the #latest-comments element
superSimpleAjax({url: 'latest-comments.php'}, 'latest-comments');
// GET article with ID 12 and alert its contents
superSimpleAjax({
url: 'get-article.php',
data: 'id=12',
callback: function (data) {
alert(data);
}
});
// POST a comment to post-comment.php
superSimpleAjax({
method: 'POST',
url: 'post-comment.php',
data: 'author=John Doe&email=johndoe@johndoe.com&content=Hi, my name is John Doe',
callback: function (data) {
alert('Thanks for your comment!');
}
});Grab the code from Google Code. It's about 1k uncompressed.
Enjoy!
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