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const usernameField = document.getElementById("field-username");
function throttle(fn, wait) {
let timeout;
return function() {
const args = Array.from(arguments);
if (timeout) {
clearTimeout(timeout);
}
timeout = setTimeout(fn.bind.apply(fn, [null].concat(args)), wait);
}
}
function checkUsernameAvailable(username) {
let check_uri = 'check?username=' + encodeURIComponent(username);
return fetch(check_uri, {
// include the cookie
"credentials": "same-origin",
}).then((response) => {
if(!response.ok) {
// for non-200 responses, raise the body of the response as an exception
return response.text().then((text) => { throw new Error(text); });
} else {
return response.json();
}
}).then((json) => {
if(json.error) {
return {message: json.error};
} else if(json.available) {
return {available: true};
} else {
return {message: username + " is not available, please choose another."};
}
});
}
function validateUsername(username) {
usernameField.setCustomValidity("");
if (usernameField.validity.valueMissing) {
usernameField.setCustomValidity("Please provide a username");
return;
}
if (usernameField.validity.patternMismatch) {
usernameField.setCustomValidity("Invalid username, please only use " + allowedCharactersString);
return;
}
usernameField.setCustomValidity("Checking if username is available …");
throttledCheckUsernameAvailable(username);
}
const throttledCheckUsernameAvailable = throttle(function(username) {
const handleError = function(err) {
// don't prevent form submission on error
usernameField.setCustomValidity("");
console.log(err.message);
};
try {
checkUsernameAvailable(username).then(function(result) {
if (!result.available) {
usernameField.setCustomValidity(result.message);
usernameField.reportValidity();
} else {
usernameField.setCustomValidity("");
}
}, handleError);
} catch (err) {
handleError(err);
}
}, 500);
usernameField.addEventListener("input", function(evt) {
validateUsername(usernameField.value);
});
usernameField.addEventListener("change", function(evt) {
validateUsername(usernameField.value);
});
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