Form Validation
Form validation ensures that users enter correct data before submission.
HTML5 Validation Attributes
<input type="email" required>
<input type="text" pattern="[A-Za-z]{3,}" title="Enter at least 3 letters">required: Makes a field mandatory.pattern: Enforces a specific format.title: Provides additional information.
File Uploads & Security
Allow users to upload files safely.
<input type="file" accept="image/*">Security Measures
- Validate files on the server.
- Restrict file types and sizes.
Custom Form Elements
Datalist for Auto-Suggestions
<input list="countries">
<datalist id="countries">
<option value="USA">
<option value="Canada">
</datalist>Range Slider
<input type="range" min="1" max="100">Date and Time Pickers
<input type="date">
<input type="datetime-local">Enhancing Forms with JavaScript
Real-Time Validation
<input type="text" id="username">
<p id="error"></p>
<script>
document.getElementById("username").addEventListener("input", function() {
if(this.value.length < 3) {
document.getElementById("error").textContent = "Must be at least 3 characters long.";
} else {
document.getElementById("error").textContent = "";
}
});
</script>Well-designed forms enhance user experience. Next, we’ll explore APIs & interactive features.