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site/content/docs/4.3/examples/checkout/form-validation.js

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+// Example starter JavaScript for disabling form submissions if there are invalid fields
+(function () {
+  'use strict'
+
+  window.addEventListener('load', function () {
+    // Fetch all the forms we want to apply custom Bootstrap validation styles to
+    var forms = document.getElementsByClassName('needs-validation')
+
+    // Loop over them and prevent submission
+    Array.prototype.filter.call(forms, function (form) {
+      form.addEventListener('submit', function (event) {
+        if (form.checkValidity() === false) {
+          event.preventDefault()
+          event.stopPropagation()
+        }
+
+        form.classList.add('was-validated')
+      }, false)
+    })
+  }, false)
+})()