1 files changed, 34 insertions, 0 deletions
diff --git a/app/assets/javascripts/validators/input_validator.js b/app/assets/javascripts/validators/input_validator.js
new file mode 100644
index 00000000000..f37373977b8
--- /dev/null
+++ b/app/assets/javascripts/validators/input_validator.js
@@ -0,0 +1,34 @@
+const invalidInputClass = 'gl-field-error-outline';
+
+export default class InputValidator {
+  constructor() {
+    this.inputDomElement = {};
+    this.inputErrorMessage = {};
+    this.errorMessage = null;
+    this.invalidInput = null;
+  }
+
+  setValidationStateAndMessage() {
+    this.setValidationMessage();
+
+    const isInvalidInput = !this.inputDomElement.checkValidity();
+    this.inputDomElement.classList.toggle(invalidInputClass, isInvalidInput);
+    this.inputErrorMessage.classList.toggle('hide', !isInvalidInput);
+  }
+
+  setValidationMessage() {
+    if (this.invalidInput) {
+      this.inputDomElement.setCustomValidity(this.errorMessage);
+      this.inputErrorMessage.innerHTML = this.errorMessage;
+    } else {
+      this.resetValidationMessage();
+    }
+  }
+
+  resetValidationMessage() {
+    if (this.inputDomElement.validationMessage === this.errorMessage) {
+      this.inputDomElement.setCustomValidity('');
+      this.inputErrorMessage.innerHTML = this.inputDomElement.title;
+    }
+  }
+}