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Password Strength Meter Ring JS

Help users pick strong passwords visually. We update an SVG progress ring in real-time, but the interface stays clean and out of the way until they start typing.

143

#javascript

#css

#password strength

#form input

#svg #validation

#ui

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*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: #f9fafb;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  margin: 0;
  padding: 20px;
}

.password-group {
  background: #ffffff;
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  width: 100%;
  max-width: 400px;
  border: 1px solid #f3f4f6;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: #374151;
}

.input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

#pwd-input {
  width: 100%;
  padding: 12px 48px 12px 16px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  outline: none;
  transition: border-color 0.2s;
  font-size: 1rem;
  color: #111827;
}

#pwd-input:focus {
  border-color: #3b82f6;
}

.strength-ring {
  position: absolute;
  right: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
}

.ring-progress {
  transition: stroke-dashoffset 0.4s ease, stroke 0.4s ease;
}

.hint {
  font-size: 0.875rem;
  color: #6b7280;
  margin-top: 12px;
  margin-bottom: 0;
}

const input = document.getElementById("pwd-input");
const ring = document.getElementById("ring-progress");

input.addEventListener("input", () => {
  const val = input.value;
  let score = 0;
  
  // 1. Point for length
  if (val.length > 7) {
    score++;
  }

let hasUpper = false;
  let hasNumber = false;
  let hasSpecial = false;

// 2. Loop through and look at every single character using charAt()
  for (let i = 0; i < val.length; i++) {
    const char = val.charAt(i);
    
    if (char >= 'A' && char <= 'Z') {
      hasUpper = true;
    } else if (char >= '0' && char <= '9') {
      hasNumber = true;
    } else if (char >= 'a' && char <= 'z') {
      // It is a lowercase letter, so we just continue
    } else {
      // If it is not uppercase, not a number, and not lowercase, it must be a special character
      hasSpecial = true;
    }
  }

// 3. Add points based on what we found
  if (hasUpper) score++;
  if (hasNumber) score++;
  if (hasSpecial) score++;

// 4. Update the visual ring
  let offset = 100;
  let color = "#ef4444";

if (score === 1) { 
    offset = 75; 
    color = "#ef4444"; 
  } else if (score === 2) { 
    offset = 50; 
    color = "#f59e0b"; 
  } else if (score === 3) { 
    offset = 25; 
    color = "#3b82f6"; 
  } else if (score >= 4) { 
    offset = 0; 
    color = "#10b981"; // Green!
  }

// Reset if input is empty
  if (val.length === 0) {
    offset = 100;
  }

ring.style.strokeDashoffset = offset;
  ring.style.stroke = color;
});

Password Strength Meter Ring JS

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