How to use the cron-parser/lib/expression._parseField function in cron-parser
To help you get started, we’ve selected a few cron-parser examples, based on popular ways it is used in public projects.
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auth0 / webtask-widget / src / components / editor / cronEditor.js View on Github 
onChangeSegment(i, value) {
const invalid = this.state.invalid.slice();
const atoms = this.state.atoms.slice();
const field = CronExpression.map[i + 1]; // The .map also has seconds, skip over it
atoms[i] = value;
try {
CronExpression._parseField(
field,
value,
CronExpression.constraints[i + 1]);
} catch (e) {
invalid[i] = e.message;
return this.setState({ atoms, invalid });
}
const schedule = atoms.join(' ');
invalid[i] = false;
this.setState({ atoms, invalid, schedule }, () => {
if (this.props.onChange) this.props.onChange(this.getValue());
});cron-parser
Node.js library for parsing crontab instructions
