web api instance method
LanguageDetector: measureInputUsage() method
Limited availabilitySecure context
The measureInputUsage() method of the LanguageDetector interface reports how much input quota would be used by a language detection operation for a given text input.
Syntax
measureInputUsage(input)
measureInputUsage(input, options)
Parameters
input- : A string representing the input text you want an input usage measurement for.
optionsOptional- : An object specifying configuration options for the
measureInputUsage()operation. Possible values include:signal- : An
AbortSignalobject instance, which allows themeasureInputUsage()operation to be aborted via the associatedAbortController.
- : An
- : An object specifying configuration options for the
Return value
A Promise that fulfills with a number specifying the inputQuota usage of the given input text.
This number is implementation-dependent; if it is less than the inputQuota, the string’s language can be detected.
Exceptions
NotAllowedErrorDOMException- : Thrown if usage of the
LanguageDetectorAPI is blocked by alanguage-detectorPermissions-Policy.
- : Thrown if usage of the
UnknownErrorDOMException- : Thrown if the
measureInputUsage()call failed for any other reason, or a reason the user agent did not wish to disclose.
- : Thrown if the
Examples
Checking if you have enough quota
In the below snippet, we create a new LanguageDetector instance using create(), then return the total input quota via inputQuota and the input quota usage for a detecting a particular text string’s language via measureInputUsage().
We then test to see if the individual input usage for that string is greater than the total available quota. If so, we throw an appropriate error; it not, we commence detecting the string’s language using detect().
const detector = await LanguageDetector.create({
expectedInputLanguages: ["en-US", "zh"],
});
const totalInputQuota = detector.inputQuota;
const inputUsage = await detector.measureInputUsage(myTextString);
if (inputUsage > totalInputQuota) {
throw new Error("Insufficient quota to detect languages.");
} else {
console.log("Quota available to detect languages.");
const results = await detector.detect(myTextString);
// ...
}