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News ticker

When this ticker worked together with other JavaScript and JQuery snippets on a page, everything stale until this BBC style newsticker ticked.

Sample

• When this ticker worked together with other JavaScript and JQuery snippets on a page, everything stale until this BBC style newsticker ticked.
• jQuery

Foreword by author

News ticker plugin (BBC news style)
Bryan Gullan,2007-2009
version 1.2.2
updated 2009-02-15
http://www.makemineatriple.com/jquery
Use and distrubute freely with this header

Options (defaults shown):
newsList: "#news" 	// assumes unordered list; specify the ul holding the news items
tickerRate: 80 		// time gap between display of each letter (ms)
startDelay: 100 	// delay before first run of the ticker (ms)
loopDelay: 3000 	// time for which full text of each item is shown at end of print-out (ms)
placeHolder1: " |"	// character placeholder shown on even loops
placeHolder2: "_"	// character placeholder shown on odd loops

Underline text decoration on the link is not recommended! :-)

Code

<ul id="news" style="height:33px;list-style:none;">
	<li>
		<a href="http://www.makemineatriple.com">MakeMineATriple.com</a>
	</li>
	<li>
		<a href="http://www.jquery.com">jQuery</a>
	</li>
</ul>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
(function($)
{
	function runTicker(settings)
	{
		if(settings.firstRun == 1)
		{
			currentLength	 = settings.currentLength;
			currentItem	   = settings.currentItem;
			settings.firstRun = 0;
		}

		if(currentItem == settings.newsItemCounter + 1)
		{
			currentItem = 0;
		}

		if(currentLength == 0)
		{
			if(settings.newsLinks[currentItem].length > 0)
			{
				$(settings.newsList).empty().append('<li><a href="'+ settings.newsLinks[currentItem] +'"><\/a><\/li>');
			}
			else
			{
				$(settings.newsList).empty().append('<li><\/li>');
			}
		}

		if( currentLength % 2 == 0)
		{
			placeHolder = settings.placeHolder1;
		}
		else
		{
			placeHolder = settings.placeHolder2;
		}

		if(currentLength <= settings.newsItems[currentItem].length + 1)
		{
			var tickerText = settings.newsItems[currentItem].substring(0,currentLength);

			if(settings.newsLinks[currentItem].length > 0)
			{
				$(settings.newsList + ' li a').text(tickerText);
			}
			else
			{
				$(settings.newsList + ' li').text(tickerText);
			}

			currentLength ++;

			setTimeout(
				function()
				{
					runTicker(settings);
					settings = null;
				},settings.tickerRate
			);
		}
		else
		{
			if(settings.newsLinks[currentItem].length > 0)
			{
				$(settings.newsList + ' li a').text(settings.newsItems[currentItem]);
			}
			else
			{
				$(settings.newsList + ' li').text(settings.newsItems[currentItem]);
			}

			currentLength = 0;
			currentItem ++;
			setTimeout(
				function()
				{
					runTicker(settings);
					settings = null;
				},
				settings.loopDelay
			);
		}
	}

	$.fn.extend({
		newsTicker: function(settings)
		{
			settings = jQuery.extend(
			{
				newsList: ".news",
				tickerRate: 80,
				startDelay: 100,
				loopDelay: 3000,
				placeHolder1: " |",
				placeHolder2: "_"
			}, settings);

			var newsItems = new Array();
			var newsLinks = new Array();
			var newsItemCounter = 0;

			$(settings.newsList + ' li').hide();

			$(settings.newsList + ' li').each
			(
				function()
				{
					if($(this).children('a').length)
					{
						newsItems[newsItemCounter] = $(this).children('a').text();
						newsLinks[newsItemCounter] = $(this).children('a').attr('href');
					}
					else
					{
						newsItems[newsItemCounter] = $(this).text();
						newsLinks[newsItemCounter] = '';
					}
					newsItemCounter ++;
				}
			);

			settings = jQuery.extend(settings,{
				newsItems: newsItems,
				newsLinks: newsLinks,
				newsItemCounter: newsItemCounter - 1,
				currentItem: 0,
				currentLength: 0,
				firstRun:1
			});

			setTimeout(
				function()
				{
					runTicker(settings);
					settings = null;
				},
				settings.startDelay
			);
		}

	});
})(jQuery);


$(document).ready(function() {
	var options = {
		newsList: "#news",
		startDelay: 10,
		placeHolder1: "[]"
	}
	$().newsTicker(options);
});
//]]>
</script>

2009

Web Development - XHTML CSS JavaScript jQuery.