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August 6, 2019 09:18
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A React component to display timestamps as "time ago" strings.
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import React, {Component} from 'react'; | |
const SECOND = 1000, | |
MINUTE = SECOND * 60, | |
HOUR = MINUTE * 60, | |
DAY = HOUR * 24, | |
MONTH = DAY * 30, | |
YEAR = DAY * 365; | |
export const getTimeAgoString = (timestamp) => { | |
const elapsed = Date.now() - timestamp, | |
getElapsedString = (value, unit) => { | |
const round = Math.round(elapsed / value); | |
return `${round} ${unit}${round > 1 | |
? 's' | |
: ''} ago`; | |
}; | |
if (elapsed < MINUTE) { | |
return getElapsedString(SECOND, 'second'); | |
} | |
if (elapsed < HOUR) { | |
return getElapsedString(MINUTE, 'minute'); | |
} | |
if (elapsed < DAY) { | |
return getElapsedString(HOUR, 'hour'); | |
} | |
if (elapsed < MONTH) { | |
return getElapsedString(DAY, 'day'); | |
} | |
if (elapsed < YEAR) { | |
return getElapsedString(MONTH, 'month'); | |
} | |
return getElapsedString(YEAR, 'year'); | |
}; | |
export default class TimeAgo extends Component { | |
state = { | |
datetime: null, | |
string: "" | |
}; | |
setDateTime = ({timestamp}) => { | |
const date = new Date(timestamp); | |
this.setState({datetime: date.toISOString(), string: getTimeAgoString(timestamp)}); | |
}; | |
componentDidMount() { | |
this.setDateTime(this.props); | |
} | |
componentWillReceiveProps(props) { | |
this.setDateTime(props); | |
} | |
shouldComponentUpdate(props, {datetime}) { | |
return datetime !== this.state.datetime; | |
} | |
render() { | |
const {datetime, string} = this.state; | |
return <time dateTime={datetime}>{string}</time>; | |
} | |
} |
Hi @Isaac1m, hi @adrihle,
Sorry for the very late reply, I haven't been on GitHub much lately.
Actually, the timestamp
prop could be any accepted argument of a Date instance (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date). I'll skip the prop validation for now, until I find some time to tune it.
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Wonderfull mate. im starting with react and i have a doubt,
i passed the props like timestamp, directly fetched from mysql default timestamp, but appear a error of type string, how can i do for do it correctly? thanks!