How to Make Fields Required in Forms: Step-By-Step Validation Guide

I remember building my first form in 1998 and watching users submit it empty. 💡 One attribute would have saved me hours of validation headaches.

Modern forms give you multiple ways to enforce requirements. The HTML5 required attribute is the simplest—just add it to your input tags. For more control, JavaScript lets you check fields before submission with custom messages.

Platforms like WordPress have built-in toggles in their form builders. Either way, you’ll catch empty submissions before they hit your database, saving you from incomplete data and frustrated users.

Works across all modern browsers and CMS platforms. Here’s how to implement each method.

What Youll Need

Step-by-Step Instructions for Making Fields Required in Forms

Here’s the foolproof method I use to ensure users can’t submit incomplete data.

Open your form editor—whether it’s WordPress, Google Forms, or a custom HTML environment. I always start by locating the form settings or field properties panel, which is usually on the right sidebar or under a gear icon.

If you’re working in a visual builder, click the specific field you want to modify. The settings panel will display options like label, type, and validation rules. This is where you’ll enforce the requirement.

In most platforms, there’s a simple toggle labeled Required, Mandatory, or Cannot be empty. Flip this switch for each critical field. For Google Forms, it’s a switch next to the field; in WordPress plugins like Gravity Forms, check the Required box in the field settings.

For custom HTML forms, add the required attribute directly to the input tag: <input type="text" name="username" required>. This is a native HTML5 feature supported by all modern browsers.

Default error messages like “This field is required” work, but I prefer customizing them for clarity. In WordPress, look for the Custom Validation Message option. In JavaScript, use setCustomValidity() to define a user-friendly prompt.

For example: document.getElementById("email").setCustomValidity("Please enter a valid email address");. This ensures users understand exactly what’s missing without generic alerts.

Submit the form with all required fields empty. You should see the validation errors appear instantly. In HTML5 forms, the browser highlights the field in red and shows the message. In platforms like Google Forms, it prevents submission and marks the fields.

Test edge cases too: partial data, incorrect formats (like invalid emails), and mobile submissions. I’ve caught issues where validation worked on desktop but failed on iOS Safari due to autocomplete quirks.

After deployment, check your form analytics or error logs. If users abandon the form at a specific required field, the validation message might be unclear. Tools like Google Analytics or Hotjar can track drop-off points.

Adjust the messaging or field placement if needed. Sometimes, moving a required field higher in the form or simplifying the language reduces friction. Real talk: even a well-designed form can frustrate users if the requirements aren’t obvious upfront.

Tips and Common Mistakes for Perfect Form Validation

These practical insights will help you implement required fields without creating user frustration.

Platform-Specific Nuances: In WordPress, the Required toggle is often hidden under Advanced Settings—don’t miss it! For Google Forms, the switch is obvious but remember it applies to the entire form by default. In HTML, the required attribute works across all modern browsers, but older versions of Safari might need polyfills. I learned this the hard way during a client project in Denver.

Validation Message Clarity: Generic messages like “This field is required” create confusion. In Step 3, use specific prompts like “Please enter your email address” instead. For JavaScript implementations, setCustomValidity() lets you tailor messages dynamically—this small touch reduces user abandonment rates significantly.

Testing Edge Cases: Don’t just test empty submissions. As mentioned in Step 4, try partial data, invalid formats, and mobile browsers. I once spent hours debugging why validation failed on iOS Safari—turns out autocomplete was interfering with the required attribute. Testing on multiple devices saves headaches later.

User Experience Focus: In Step 5, if analytics show users dropping off at a specific field, it’s often because the requirement isn’t clear upfront. Consider moving critical fields higher in the form or adding visual indicators like asterisks. Real talk: a well-placed asterisk prevents more frustration than any error message.

Frequently Asked Questions

Are there alternatives to the HTML required attribute?
For advanced validation, use JavaScript (e.g., onsubmit checks) or libraries like Formik. Server-side validation is also critical for security.

Making fields required in forms ensures accurate and complete data collection. Start implementing these validation techniques today to improve user experience and form functionality. Ready to take it further? Explore advanced form validation libraries to streamline your workflow even more! 🎯