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@mislav
Forked from rails/gist:58761
Created February 5, 2009 16:23
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Update contents of elements with relative times
document.observe("dom:loaded", function() {
function updateElementsWithTime() {
$$("span[time]").invoke('updateTime')
}
// update immediately
updateElementsWithTime()
// continue updating every 2 minutes
new PeriodicalExecuter(updateElementsWithTime, 60 * 2)
})
Element.addMethods({
updateTime: function(element) {
element = $(element)
var time = element.readAttribute("time")
var relativeTime = DateHelper.time_ago_in_words_with_parsing(time)
element.update(relativeTime)
return element
}
})
var DateHelper = {
// Takes the format of "Jan 15, 2007 15:45:00 GMT" and converts it to a relative time
// Ruby strftime: %b %d, %Y %H:%M:%S GMT
time_ago_in_words_with_parsing: function(from) {
var date = new Date;
date.setTime(Date.parse(from));
return this.time_ago_in_words(date);
},
time_ago_in_words: function(from) {
return this.distance_of_time_in_words(new Date, from);
},
distance_of_time_in_words: function(to, from) {
var distance_in_seconds = ((to - from) / 1000);
var distance_in_minutes = (distance_in_seconds / 60).floor();
if (distance_in_minutes == 0) { return 'less than a minute ago'; }
if (distance_in_minutes == 1) { return 'a minute ago'; }
if (distance_in_minutes < 45) { return distance_in_minutes + ' minutes ago'; }
if (distance_in_minutes < 90) { return 'about 1 hour ago'; }
if (distance_in_minutes < 1440) { return 'about ' + (distance_in_minutes / 60).floor() + ' hours ago'; }
if (distance_in_minutes < 2880) { return '1 day ago'; }
if (distance_in_minutes < 43200) { return (distance_in_minutes / 1440).floor() + ' days ago'; }
if (distance_in_minutes < 86400) { return 'about 1 month ago'; }
if (distance_in_minutes < 525960) { return (distance_in_minutes / 43200).floor() + ' months ago'; }
if (distance_in_minutes < 1051199) { return 'about 1 year ago'; }
return 'over ' + (distance_in_minutes / 525960).floor() + ' years ago';
}
};
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