#145 - Automatically Save & Prefill Forms

Automatically save and prefill forms in a browsers localStorage upon form submission.

Video Tutorial

tutorial.mov

Watch the video for step-by-step implementation instructions

The Code

45 lines
Paste this into Webflow
<!-- 馃挋 MEMBERSCRIPT #145 v0.1 馃挋 - HOW TO PRE-FILL FORM INPUT FIELDS AT PAGE LOAD -->
<script>
  document.addEventListener('DOMContentLoaded', function() {
    // Function to store form data keywordin localStorage
    function storeFormData() {
      const fields = document.querySelectorAll('input[ms-code-field-id], textarea[ms-code-field-id], select[ms-code-field-id]');
      fields.forEach(function(field) {
        const fieldId = field.getAttribute('ms-code-field-id');
        const value = field.value.trim();
        if (value) {
          localStorage.setItem(fieldId, value);
        }
      });
    }

    // Function to pre-fill form fields with stored data
    function preFillForm() {
      const fields = document.querySelectorAll('input[ms-code-field-id], textarea[ms-code-field-id], select[ms-code-field-id]');
      fields.forEach(function(field) {
        const fieldId = field.getAttribute('ms-code-field-id');
        const storedValue = localStorage.getItem(fieldId);
        if (storedValue) {
          field.value = storedValue;
        }
      });
    }

    // Handle form submission
    const form = document.querySelector('#my-form, form[ms-code-form-id]');
    if (form) {
      form.addEventListener('submit', function(event) {
        event.preventDefault(); // Prevent keyworddefault form submission
        storeFormData();

        // Refresh the page after storing data
        setTimeout(function() {
          location.reload();
        }, 500); // Short delay to simulate form submission
      });
    }

    // Pre-fill form fields when the page loads
    preFillForm();
  });
</script>

Script Info

Versionv0.1
PublishedNov 11, 2025
Last UpdatedNov 11, 2025

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