Live Form Validation (Basic)

Lightweight live form validation for Webflow covering text inputs, email, and textarea fields. Includes anti-spam protection and a custom submit handler. No support for select, radio, or checkbox groups — use the Advanced version for those.

validationjavascriptwebflowemail

Code

HTML

html

<div data-form-validate="" class="form-group w-form">
  <form id="wf-form-Default-Form" name="wf-form-Default-Form" data-name="Default Form" method="get" class="form">
    <div data-validate="" class="form-field-group">
      <label for="name" class="form-label">Name <span class="form-required">*</span></label>
      <div class="form-field">
        <input class="form-input w-input" maxlength="256" name="name" data-name="Name" min="3" placeholder="Osmo" type="text" id="name" required="">
        <div class="form-field-icon is--success"><!-- success SVG --></div>
        <div class="form-field-icon is--error"><!-- error SVG --></div>
      </div>
    </div>
    <div data-validate="" class="form-field-group">
      <label for="email" class="form-label">Email Address <span class="form-required">*</span></label>
      <div class="form-field">
        <input class="form-input w-input" maxlength="256" name="email" data-name="Email" placeholder="hello@osmo.supply" type="email" id="email" required="">
        <div class="form-field-icon is--success"><!-- success SVG --></div>
        <div class="form-field-icon is--error"><!-- error SVG --></div>
      </div>
    </div>
    <div for="message" data-validate="" class="form-field-group">
      <label for="message" class="form-label">Message <span class="form-required">*</span></label>
      <div class="form-field">
        <textarea class="form-input is--textarea w-input" maxlength="5000" name="message" data-name="Message" min="3" placeholder="Hello Osmo, " id="message" required=""></textarea>
        <div class="form-field-icon is--success"><!-- success SVG --></div>
        <div class="form-field-icon is--error"><!-- error SVG --></div>
      </div>
    </div>
    <div class="form-field-group">
      <div class="form-divider"></div>
    </div>
    <div class="form-field-group">
      <div class="form-field">
        <div data-submit="" tabindex="0" class="form-submit-btn">
          <p class="form-submit-btn-p">Submit</p>
          <input type="submit" data-wait="Please wait..." class="form-submit w-button" value="Submit">
        </div>
      </div>
    </div>
  </form>
  <div class="form-notifcation w-form-done">
    <div class="form-notification-bg"></div>
    <div class="form-notification-p">Success! We'll be in touch soon.</div>
    <div class="form-notification-icon"><!-- success SVG --></div>
  </div>
  <div class="form-notifcation is--error w-form-fail">
    <div class="form-notification-bg"></div>
    <div class="form-notification-p">Something went wrong while submitting.</div>
    <div class="form-notification-icon"><!-- error SVG --></div>
  </div>
</div>

CSS

css

.form-group {
  grid-column-gap: 1.5em;
  grid-row-gap: 1.5em;
  flex-flow: column;
  width: 25em;
  margin-bottom: 0;
  display: flex;
}

.form {
  grid-column-gap: 1.5em;
  grid-row-gap: 1.5em;
  flex-flow: column;
  width: 100%;
  display: flex;
}

.form-field-group {
  grid-column-gap: .75em;
  grid-row-gap: .75em;
  flex-flow: column;
  align-items: flex-start;
  display: flex;
}

.form-field {
  width: 100%;
  position: relative;
}

.form-label {
  color: #131313;
  width: 100%;
  margin-bottom: 0;
  font-size: .875em;
  font-weight: 500;
  line-height: 1;
}

.form-required {
  color: #ff4c24;
}

.form-input {
  outline-offset: 0px;
  color: #131313;
  -webkit-appearance: none;
  appearance: none;
  box-sizing: border-box;
  vertical-align: middle;
  background-color: #efeeec;
  border: 1px solid #efeeec;
  border-radius: .328125em;
  outline: 0 #0000;
  height: auto;
  margin-bottom: 0;
  padding: .9em 3.5em .9em 1em;
  font-size: 1.125em;
  font-weight: 500;
  line-height: 1.2;
  box-shadow: 0 0 #0000;
}

.form-input.is--textarea {
  resize: vertical;
  min-height: 9em;
}

.form-input:focus {
  border-color: #cbc8c5;
}

.form-input::placeholder {
  color: #1313134d;
  background-color: #efeeec;
}

.form-field-icon {
  opacity: 0;
  pointer-events: none;
  color: #cbc8c5;
  -webkit-user-select: none;
  user-select: none;
  border-radius: .375em;
  justify-content: center;
  align-items: center;
  width: 3.5em;
  max-height: 3.5em;
  padding-left: 1em;
  padding-right: 1em;
  display: flex;
  position: absolute;
  top: 1px;
  bottom: 1px;
  right: 1px;
}

.form-field-icon.is--error {
  color: #ff4c24;
}

.form-submit {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  inset: 0;
}

.form-submit-btn {
  outline-offset: 0px;
  color: #efeeec;
  cursor: pointer;
  background-color: #131313;
  border: 1px solid #131313;
  border-radius: .375rem;
  outline: 0 #0000;
  flex-flow: row;
  justify-content: flex-start;
  align-items: center;
  padding: 1.005em 1.125em;
  display: flex;
  position: relative;
  overflow: hidden;
  box-shadow: inset 0 0 #0000;
}

.form-submit-btn:focus {
  outline-offset: 0px;
  border-width: 1px;
  border-color: #cbc8c5;
  outline-color: #131313;
}

.form-submit-btn-p {
  margin-bottom: 0;
  font-size: 1.125em;
  font-weight: 500;
  line-height: 1.2;
}

.form-divider {
  opacity: .15;
  background-color: #131313;
  width: 100%;
  height: 1px;
}

.form-notifcation {
  outline-offset: 0px;
  color: #0ba954;
  text-align: left;
  border: 1px solid #0ba954;
  border-color: inherit;
  background-color: #efeeec;
  border-radius: .375rem;
  outline: 0 #0000;
  width: 100%;
  padding: 1.125em;
  font-size: 1em;
  position: relative;
}

.form-notifcation.is--error {
  color: #ff4c24;
  margin-top: 0;
  padding-right: 3.5em;
}

.form-notification-icon {
  pointer-events: none;
  color: inherit;
  justify-content: center;
  align-items: center;
  width: 3.5em;
  padding-left: 1em;
  padding-right: 1em;
  display: flex;
  position: absolute;
  top: 50%;
  right: 0;
  transform: translateY(-50%);
}

.form-notification-bg {
  opacity: .1;
  pointer-events: none;
  color: inherit;
  background-color: currentColor;
  border-radius: calc(.375rem - 2px);
  display: flex;
  position: absolute;
  inset: 0;
}

.form-notification-p {
  color: inherit;
  font-size: 1.125em;
  font-weight: 500;
}

@media screen and (max-width: 767px) {
  .form-group {
    width: 100%;
  }
}

/* Field: Error */
[data-validate].is--error input,
[data-validate].is--error textarea {
  border-color: #FF4C24;
}

[data-validate].is--error .form-field-icon.is--error {
  opacity: 1;
}

/* Field: Success */
[data-validate].is--success .form-field-icon.is--success {
  opacity: 1;
}

JavaScript

javascript

function initBasicFormValidation() {
  const forms = document.querySelectorAll('[data-form-validate]');

  forms.forEach((form) => {
    const fields = form.querySelectorAll('[data-validate] input, [data-validate] textarea');
    const submitButtonDiv = form.querySelector('[data-submit]');
    const submitInput = submitButtonDiv.querySelector('input[type="submit"]');

    const formLoadTime = new Date().getTime();

    const validateField = (field) => {
      const parent = field.closest('[data-validate]');
      const minLength = field.getAttribute('min');
      const maxLength = field.getAttribute('max');
      const type = field.getAttribute('type');
      let isValid = true;

      if (field.value.trim() !== '') {
        parent.classList.add('is--filled');
      } else {
        parent.classList.remove('is--filled');
      }

      if (minLength && field.value.length < minLength) {
        isValid = false;
      }

      if (maxLength && field.value.length > maxLength) {
        isValid = false;
      }

      if (type === 'email' && !/\S+@\S+\.\S+/.test(field.value)) {
        isValid = false;
      }

      if (isValid) {
        parent.classList.remove('is--error');
        parent.classList.add('is--success');
      } else {
        parent.classList.remove('is--success');
        parent.classList.add('is--error');
      }

      return isValid;
    };

    const startLiveValidation = (field) => {
      field.addEventListener('input', function () {
        validateField(field);
      });
    };

    const validateAndStartLiveValidationForAll = () => {
      let allValid = true;
      let firstInvalidField = null;

      fields.forEach((field) => {
        const valid = validateField(field);
        if (!valid && !firstInvalidField) {
          firstInvalidField = field;
        }
        if (!valid) {
          allValid = false;
        }
        startLiveValidation(field);
      });

      if (firstInvalidField) {
        firstInvalidField.focus();
      }

      return allValid;
    };

    const isSpam = () => {
      const currentTime = new Date().getTime();
      const timeDifference = (currentTime - formLoadTime) / 1000;
      return timeDifference < 5;
    };

    submitButtonDiv.addEventListener('click', function () {
      if (validateAndStartLiveValidationForAll()) {
        if (isSpam()) {
          alert('Form submitted too quickly. Please try again.');
          return;
        }
        submitInput.click();
      }
    });

    form.addEventListener('keydown', function (event) {
      if (event.key === 'Enter' && event.target.tagName !== 'TEXTAREA') {
        event.preventDefault();
        if (validateAndStartLiveValidationForAll()) {
          if (isSpam()) {
            alert('Form submitted too quickly. Please try again.');
            return;
          }
          submitInput.click();
        }
      }
    });
  });
}

// Initialize Basic Form Validation
document.addEventListener('DOMContentLoaded', () => {
  initBasicFormValidation();
});

Attributes

Name	Type	Default	Description
data-form-validate	attribute	—	Add to the outer container (parent of the <form> element). Signals the script where to find the form.
data-validate	attribute	—	Add to each field group (label + input/textarea). Required on every group that needs validation.
data-submit	attribute	—	Wrap the submit button. The script intercepts the click, validates all fields, then triggers the real submit only if valid.
min	number	—	Minimum character length required for the field to pass validation.
max	number	—	Maximum character length allowed for the field.

Notes

•Only supports <input> and <textarea> fields — no select, radio, or checkbox validation.
•Live validation starts on each field only after the user first interacts (input event). On submit, all fields are validated at once.
•Anti-spam: submission is blocked if the form is submitted in less than 5 seconds after page load.
•Pressing Enter in any input (except <textarea>) triggers the full validation and custom submit logic.
•Dynamic classes: .is--error (fails validation), .is--success (passes validation), .is--filled (field has a value).
•Need select, radio, or checkbox support? Use Live Form Validation (Advanced) instead.

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