dosubot[bot] commented on issue #31864:
URL: https://github.com/apache/superset/issues/31864#issuecomment-2855511612
<!-- Answer -->
To create a `StringFormatter` function that truncates a string to a
substring of up to 15 characters, you can define a custom formatter function.
This function will take a string as input and return the truncated version.
Here's how you can implement it:
```ts
function getStringFormatter(): (value: string) => string {
return (value: string) => {
if (typeof value === 'string') {
return value.length > 15 ? `${value.substring(0, 15)}...` : value;
}
return value;
};
}
```
You can then modify the `getXAxisFormatter` function to use this
`getStringFormatter` when no specific time format is provided:
```ts
export function getXAxisFormatter(
format?: string,
): TimeFormatter | ((value: string) => string) | undefined {
if (format === SMART_DATE_ID || !format) {
return undefined;
}
if (format) {
return getTimeFormatter(format);
}
return getStringFormatter();
}
```
This way, if no specific format is provided, the `getXAxisFormatter` will
return a function that truncates strings to a maximum of 15 characters,
appending "..." if the string is longer.
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