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social login Fix username validation javascript (#9297)
* fix validation and don't use built-in validation UI Co-authored-by: Bruno Windels <brunow@element.io>
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3 changed files with 85 additions and 21 deletions
1
changelog.d/9297.feature
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1
changelog.d/9297.feature
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@ -0,0 +1 @@
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Further improvements to the user experience of registration via single sign-on.
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@ -18,6 +18,19 @@
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font-size: 12px;
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}
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.username_input.invalid {
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border-color: #FE2928;
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}
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.username_input.invalid input, .username_input.invalid label {
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color: #FE2928;
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}
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.username_input div, .username_input input {
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line-height: 18px;
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font-size: 14px;
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}
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.username_input label {
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position: absolute;
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top: -8px;
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@ -78,6 +91,15 @@
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display: block;
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margin-top: 8px;
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}
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output {
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padding: 0 14px;
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display: block;
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}
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output.error {
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color: #FE2928;
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}
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</style>
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</head>
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<body>
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@ -87,12 +109,13 @@
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</header>
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<main>
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<form method="post" class="form__input" id="form">
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<div class="username_input">
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<div class="username_input" id="username_input">
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<label for="field-username">Username</label>
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<div class="prefix">@</div>
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<input type="text" name="username" id="field-username" autofocus required pattern="[a-z0-9\-=_\/\.]+">
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<input type="text" name="username" id="field-username" autofocus>
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<div class="postfix">:{{ server_name }}</div>
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</div>
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<output for="username_input" id="field-username-output"></output>
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<input type="submit" value="Continue" class="primary-button">
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{% if user_attributes %}
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<section class="idp-pick-details">
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@ -1,14 +1,24 @@
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const usernameField = document.getElementById("field-username");
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const usernameOutput = document.getElementById("field-username-output");
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const form = document.getElementById("form");
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// needed to validate on change event when no input was changed
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let needsValidation = true;
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let isValid = false;
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function throttle(fn, wait) {
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let timeout;
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return function() {
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const throttleFn = function() {
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const args = Array.from(arguments);
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if (timeout) {
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clearTimeout(timeout);
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}
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timeout = setTimeout(fn.bind.apply(fn, [null].concat(args)), wait);
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}
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};
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throttleFn.cancelQueued = function() {
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clearTimeout(timeout);
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};
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return throttleFn;
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}
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function checkUsernameAvailable(username) {
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@ -16,14 +26,14 @@ function checkUsernameAvailable(username) {
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return fetch(check_uri, {
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// include the cookie
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"credentials": "same-origin",
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}).then((response) => {
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}).then(function(response) {
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if(!response.ok) {
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// for non-200 responses, raise the body of the response as an exception
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return response.text().then((text) => { throw new Error(text); });
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} else {
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return response.json();
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}
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}).then((json) => {
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}).then(function(json) {
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if(json.error) {
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return {message: json.error};
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} else if(json.available) {
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@ -34,33 +44,49 @@ function checkUsernameAvailable(username) {
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});
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}
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const allowedUsernameCharacters = new RegExp("^[a-z0-9\\.\\_\\-\\/\\=]+$");
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const allowedCharactersString = "lowercase letters, digits, ., _, -, /, =";
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function reportError(error) {
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throttledCheckUsernameAvailable.cancelQueued();
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usernameOutput.innerText = error;
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usernameOutput.classList.add("error");
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usernameField.parentElement.classList.add("invalid");
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usernameField.focus();
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}
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function validateUsername(username) {
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usernameField.setCustomValidity("");
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if (usernameField.validity.valueMissing) {
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usernameField.setCustomValidity("Please provide a username");
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return;
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isValid = false;
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needsValidation = false;
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usernameOutput.innerText = "";
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usernameField.parentElement.classList.remove("invalid");
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usernameOutput.classList.remove("error");
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if (!username) {
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return reportError("Please provide a username");
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}
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if (usernameField.validity.patternMismatch) {
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usernameField.setCustomValidity("Invalid username, please only use " + allowedCharactersString);
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return;
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if (username.length > 255) {
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return reportError("Too long, please choose something shorter");
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}
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usernameField.setCustomValidity("Checking if username is available …");
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if (!allowedUsernameCharacters.test(username)) {
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return reportError("Invalid username, please only use " + allowedCharactersString);
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}
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usernameOutput.innerText = "Checking if username is available …";
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throttledCheckUsernameAvailable(username);
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}
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const throttledCheckUsernameAvailable = throttle(function(username) {
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const handleError = function(err) {
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const handleError = function(err) {
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// don't prevent form submission on error
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usernameField.setCustomValidity("");
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console.log(err.message);
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usernameOutput.innerText = "";
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isValid = true;
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};
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try {
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checkUsernameAvailable(username).then(function(result) {
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if (!result.available) {
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usernameField.setCustomValidity(result.message);
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usernameField.reportValidity();
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reportError(result.message);
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} else {
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usernameField.setCustomValidity("");
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isValid = true;
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usernameOutput.innerText = "";
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}
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}, handleError);
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} catch (err) {
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@ -68,9 +94,23 @@ const throttledCheckUsernameAvailable = throttle(function(username) {
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}
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}, 500);
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form.addEventListener("submit", function(evt) {
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if (needsValidation) {
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validateUsername(usernameField.value);
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evt.preventDefault();
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return;
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}
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if (!isValid) {
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evt.preventDefault();
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usernameField.focus();
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return;
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}
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});
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usernameField.addEventListener("input", function(evt) {
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validateUsername(usernameField.value);
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});
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usernameField.addEventListener("change", function(evt) {
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validateUsername(usernameField.value);
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if (needsValidation) {
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validateUsername(usernameField.value);
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}
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});
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