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Race Conditions
A common pitfall with async validation is to ensure the value hasn't changed during async validation. Fortunately, every validation result from Strickland includes the
value that was validated as a result prop, making these race conditions possible to detect and guard against.Let's take a look at handling this race condition in application code:
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const usernameValidator = [
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required(),
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length(2, 20),
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usernameIsAvailableTwoStage
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];
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let username = 'marty';
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let usernameResult = validate(usernameValidator, username);
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username = 'mcfly';
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if (usernameResult.validateAsync) {
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usernameResult.validateAsync().then((asyncResult) => {
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if (asyncResult.value === username) {
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// this will not be reached since
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// the username has changed
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usernameResult = asyncResult;
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}
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});
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}
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Last modified 1yr ago
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