The jquery-countdown plugin:
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Continuously measures the milliseconds between the current Date ( according to the browser ) and a given future Date specified in the elements on which the plugin is initialized.
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Emits the following events:
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countdown.update - Emitted if the milliseconds until the future Date are less than the epoch milliseconds of the current Date. A data object with references to element, remaining milliseconds, parsed Date, and timer id is sent with the event.
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countdown.end - Emitted if the milliseconds until the future Date are equal to or greater than the epoch milliseconds of the current Date. A data object with references to element, remaining milliseconds, parsed Date is sent with the event.
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countdown.error - Emitted if the text in the element(s) to which the plugin is applied is not a valid Date. A data object with references to element and error is sent with the event.
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Executes the following callbacks ( which receive references to element, milliseconds remaining, and the parsed Date ):
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onUpdate - Executed if the milliseconds until the future Date are less than the epoch milliseconds of the current Date. A data object with references to element, remaining milliseconds, parsed Date, and timer id is sent to the callback.
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onEnd - Executed if the milliseconds until the future Date are equal to or greater than the epoch milliseconds of the current Date. A data object with references to element, remaining milliseconds, parsed Date is sent to the callback.
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onError - Executed if the text in the element(s) to which the plugin is applied is not a valid Date. A data object with references to element and error is sent with the event.
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Assuming there are one or more elements in which a valid datetime string is specified, like so:
<span>2013-04-11 04:30</span>
Then initialize this plugin on those elements using the following jQuery:
$('span').countdown();
Finally, bind to events on those elements:
$(document).on("countdown.update", function(data) { data.el.css("background-color", "#ffc" ); });
$(document).on("countdown.end", function(data) { data.el.css("background-color", "#f66" ); });
$(document).on("countdown.error", function(data) { data.el.css("background-color", "#c00" ); });
Or initialize the plugin with custom callbacks and a custom interval:
$('span').countdown({
onUpdate: function( data ) { data.el.css("background-color", "#ffc"); },
onEnd: function( data ) { data.el.css("background-color", "#f66"); },
onError: function( data ) { data.el.css("background-color", "#c00"); },
interval: 10000
});
While this plugin should correctly parse most datetime strings in the format YYYY-MM-DD HH:mm:ss, you may pass a custom datetime parsing function into the initializer if your datetime strings require special handling or take advantage of third-party parsing libraries.
$('span').countdown({
parseDateTime: function( input ) {
var temp = ('' + input).replace(/-/g,"/").replace(/[TZ]/g," ");
return new Date( temp );
}
});
See index.html for an example use of this plugin with the excellent moment.js javascript date library.
jQuery-countdown was tested with jQuery 1.5.2 and 1.9.1. It may work in earlier versions. YMMV.
This plugin was written in 2013 by Jon Fuller and is released under the MIT license.