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password-validation-rules.html
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password-validation-rules.html
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<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8" />
<title>Passwort Regeln</title>
<style>
.visuallyhidden {
position: absolute;
left: -10000px;
top: auto;
width: 1px;
height: 1px;
overflow: hidden;
}
.rule-list {
}
.rule-list__item {
list-style-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 24 24"><circle cx="12" cy="12" r="8" fill="currentColor" stroke="none" stroke-width="2"/></svg>');
}
.rule-list__item--success {
color: green;
list-style-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 24 24"><text x="12" y="24" fill="currentColor" text-anchor="middle" font-size="18" font-weight="bold">✓</text></svg>');
}
.rule-list__item--error {
color: red;
list-style-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="1em" height="1em" viewBox="0 0 24 24"><text x="12" y="24" fill="currentColor" text-anchor="middle" font-size="18" font-weight="bold">✗</text></svg>');
}
.input__container {
display: flex;
flex-direction: column;
margin-block-end: 1rem;
max-width: 400px;
}
.input__label {
font-weight: bold;
}
.input__input {
border: 1px solid black;
}
.input__input[aria-invalid="true"] {
border-color: red;
}
.input__error {
color: red;
}
</style>
</head>
<body>
<main>
<form>
<div class="input__container">
<label for="email" class="input__label">E-Mail</label>
<input
type="email"
id="email"
name="email"
required
class="input__input"
/>
</div>
<div class="input__container">
<label for="password" class="input__label">Passwort</label>
<input
type="password"
id="password"
name="password"
required
aria-describedby=" password-rule-details password-error"
class="input__input"
/>
<!-- Passwort Kriterien kurz (Live-Region, visuell versteckt) -->
<div
class="visuallyhidden"
id="password-rule-summary"
aria-live="polite"
></div>
<!-- Passwort Kriterien Liste -->
<div id="password-rule-details"></div>
<!-- Fehlermeldungen -->
<div
id="password-error"
class="input__error"
aria-live="assertive"
></div>
</div>
<input type="submit" value="Absenden" />
</form>
</main>
<script>
const behaviors = {
/**
* Resets the error state if the input is cleared
*/
resetChangedOnEmptyInput: true,
/**
* Won't push list into error state if input was not changed when blurred
*/
ignoreBlurredOnUnchangedInput: false,
/**
* Form initializing without password will not be invalid
*/
emptyPasswordIsValid: true,
};
/** @type {ValidationRule[]} */
const validationRules = [
{
id: "length",
label: "Mindestens 8 Buchstaben.",
validate: (value) => value.length >= 8,
},
{
id: "uppercase",
label: "Ein Großbuchstabe.",
validate: (value) => /[A-Z]/.test(value),
},
{
id: "lowercase",
label: "Ein Kleinbuchstabe.",
validate: (value) => /[a-z]/.test(value),
},
{
id: "digit",
label: "Eine Zahl.",
validate: (value) => /[0-9]/.test(value),
},
{
id: "special",
label: "Ein Sonderzeichen (#!?@).",
validate: (value) => /[!?@#]/.test(value),
},
];
const labels = {
// Wird vor jedes Passwort eingesetzt (visuell versteckt)
rulePrefixValid: "Erfüllt: ",
rulePrefixInvalid: "Nicht erfüllt: ",
// Die Kurzzusammenfassung der aktuell noch nicht erfüllten Kriterien
summary: (validRules, validationRules, failedRulesLabel) =>
`${validRules} von ${validationRules} Regeln erfüllt. Nicht erfüllt: ${failedRulesLabel}`,
// Text für Screenreader, wenn alle Kriterien erfüllt wurden
summaryFinal: "Alle Regeln erfüllt.",
// Fehlermeldungen
errorDifferentPasswords:
"Die angegebenen Passwörter stimmen nicht überein.",
errorUnsupportedSpecChar: "Nicht erlaubtes Sonderzeichen.",
errorSpaces: "Im Passwort dürfen keine Leerzeichen enthalten sein.",
};
const inputPassword = document.getElementById("password");
const ruleSummaryContainer = document.getElementById(
"password-rule-summary"
);
const ruleDetailsContainer = document.getElementById(
"password-rule-details"
);
let passwordWasBlurred = false;
let passwordWasChanged = false;
const updateRuleDetails = () => {
const ul = Object.assign(document.createElement("ul"), {
className: "rule-list",
});
const p = Object.assign(document.createElement("p"));
p.append("Dein Passwort muss 5 Regeln erfüllen:");
let validRules = 0;
let failedRules = [];
let failedRulesLabel = "";
validationRules.forEach((rule) => {
const li = Object.assign(document.createElement("li"), {
className: "rule-list__item",
});
const valid = rule.validate(inputPassword.value);
const hiddenPrefix = Object.assign(document.createElement("span"), {
className: "visuallyhidden",
textContent: valid
? labels.rulePrefixValid
: labels.rulePrefixInvalid,
});
if (valid) {
validRules++;
li.classList.add("rule-list__item--success");
li.append(hiddenPrefix);
} else if (passwordWasChanged) {
failedRules.push(rule.label);
li.classList.add("rule-list__item--error");
li.append(hiddenPrefix);
}
li.append(document.createTextNode(rule.label));
ul.appendChild(li);
});
failedRules.forEach((rule) => {
failedRulesLabel += rule;
// replaces all . but the last one (Regex)
failedRulesLabel = failedRulesLabel.replace(/[.](?=.*[.])/g, ", ");
});
ruleDetailsContainer.innerHTML = "";
ruleDetailsContainer.append(p);
ruleDetailsContainer.append(ul);
// if(validRules == 0){
// ruleSummaryContainer.textContent = labels.summaryEmpty(validationRules.length);
// }
if (validRules !== validationRules.length) {
ruleSummaryContainer.textContent = labels.summary(
validRules,
validationRules.length,
failedRulesLabel
);
if (passwordWasBlurred) {
ruleSummaryContainer.textContent =
"Stopp! Du hast noch nicht alle Passwortkriterien erfüllt.";
passwordWasBlurred = false;
}
} else {
ruleSummaryContainer.textContent = labels.summaryFinal;
}
return validRules === validationRules.length;
};
// Validiert den eingegeben Text und erzeugt bei Bedarf Fehlermeldungen
const validatePassword = () => {
const errorContainer = document.getElementById("password-error");
if (inputPassword.value.includes(" ")) {
errorContainer.textContent = labels.errorSpaces;
} else if (inputPassword.value.match(/[$%+-]/)) {
errorContainer.textContent = labels.errorUnsupportedSpecChar;
} else {
errorContainer.textContent = "";
return true;
}
return false;
};
const updatePasswordState = () => {
let valid = true;
valid &&= updateRuleDetails();
valid &&= validatePassword();
if (behaviors.emptyPasswordIsValid) {
valid = inputPassword.value === "" || valid;
}
inputPassword.ariaInvalid = (!valid).toString();
};
// Meldung sollte das Eingabefeld vorzeitig berlassen werden
const announce = (text, assertiveness = "assertive") => {
const announcer = document.createElement("div");
announcer.className = "visuallyhidden";
announcer.setAttribute("aria-live", assertiveness);
document.body.append(announcer);
window.setTimeout(() => {
announcer.innerHTML = text;
}, 100);
window.setTimeout(() => {
announcer.remove();
}, 300);
};
// init password field
updatePasswordState();
inputPassword.addEventListener("input", () => {
passwordWasChanged = behaviors.resetChangedOnEmptyInput
? inputPassword.value !== ""
: true;
updatePasswordState();
validatePasswordRepeat();
});
inputPassword.addEventListener("blur", () => {
passwordWasBlurred = behaviors.ignoreBlurredOnUnchangedInput
? passwordWasChanged
: true;
updatePasswordState();
});
// Damit nicht die gesamte Kriterienliste ausgegeben wird, sobald man ein weiteres Kriterium erfüllt hat, wird ein Timeout gesetzt
inputPassword.addEventListener("focus", () => {
window.setTimeout(() => {
// focus
inputPassword.setAttribute(
"aria-describedby",
inputPassword
.getAttribute("aria-describedby")
.split(" ")
.filter((t) => t !== ruleDetailsContainer.id)
.join(" ")
);
}, 100);
});
/**
* @typedef ValidationRule
* @property {string} id
* @property {string} label
* @property {(value: string) => boolean} validate
*/
</script>
</body>
</html>