src/components/FormField.css

@@ -0,0 +1,54 @@
+.form-field {
+  position: relative;
+  margin-bottom: 14px;
+  width: 100%;
+}
+
+.form-field input {
+  width: 100%;
+  padding: 12px;
+  border: 2px solid #ddd;
+  border-radius: 8px;
+  font-size: 16px;
+  transition: border-color 0.3s ease;
+}
+
+.form-field input:focus {
+  outline: none;
+  border-color: #4a90e2;
+}
+
+.form-field input.error {
+  border-color: #e74c3c;
+}
+
+.error-message {
+  position: absolute;
+  bottom: -20px;
+  left: 0;
+  color: #e74c3c;
+  font-size: 12px;
+  opacity: 0;
+  transform: translateY(10px);
+  animation: slideUp 0.3s ease forwards;
+}
+
+.field-icon {
+  position: absolute;
+  left: 12px;
+  top: 50%;
+  transform: translateY(-50%);
+  z-index: 1;
+  color: #a0aec0;
+}
+
+.form-field:has(.field-icon) input {
+  padding-left: 40px;
+}
+
+@keyframes slideUp {
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}

src/components/FormField.tsx

@@ -0,0 +1,99 @@
+import React, { useState } from 'react';
+import './FormField.css';
+
+
+interface FormFieldProperties {
+  type?: 'text' | 'email' | 'password' | 'number' | 'tel' | 'url' | 'search';
+  placeholder?: string;
+  value: string;
+  onChange: (e: React.ChangeEvent<HTMLInputElement>) => void;
+  required?: boolean;
+  errorMessage?: string;
+  showError?: boolean;
+  onBlur?: (e: React.FocusEvent<HTMLInputElement>) => void;
+  onFocus?: (e: React.FocusEvent<HTMLInputElement>) => void;
+  className?: string;
+  disabled?: boolean;
+  autoComplete?: string;
+  customValidator?: (value: string) => string | null;
+  showErrorInitially?: boolean;
+  icon?: React.ComponentType<React.SVGProps<SVGSVGElement>>;
+}
+
+
+const FormField: React.FC<FormFieldProperties> = ({
+  type = 'text',
+  placeholder,
+  value,
+  onChange,
+  required = false,
+  errorMessage = 'Please fill out this field',
+  showError = false,
+  onBlur,
+  onFocus,
+  className = '',
+  disabled = false,
+  autoComplete = 'off',
+  customValidator,
+  showErrorInitially = false,
+  icon: Icon,
+}) => {
+  const [touched, setTouched] = useState<boolean>(showErrorInitially);
+  const [customError, setCustomError] = useState<string>('');
+
+  const validateField = (value: string): string => {
+    if (required && !value) {
+      return errorMessage;
+    }
+    if (customValidator) {
+      const customValidation = customValidator(value);
+      if (customValidation) {
+        return customValidation;
+      }
+    }
+    return '';
+  };
+
+  const shouldShowError = showError || (touched && validateField(value));
+
+  const handleBlur = (e: React.FocusEvent<HTMLInputElement>): void => {
+    setTouched(true);
+    const error = validateField(value);
+    setCustomError(error);
+    onBlur?.(e);
+  };
+
+  const handleFocus = (e: React.FocusEvent<HTMLInputElement>): void => {
+    setCustomError('');
+    onFocus?.(e);
+  };
+
+  return (
+    <div className={`form-field ${className}`}>
+      {Icon && (
+        <div className="field-icon">
+          <Icon />
+        </div>
+      )}
+      <input
+        type={type}
+        placeholder={placeholder}
+        value={value}
+        onChange={onChange}
+        onBlur={handleBlur}
+        onFocus={handleFocus}
+        required={required}
+        disabled={disabled}
+        autoComplete={autoComplete}
+        className={shouldShowError ? 'error' : ''}
+      />
+      {shouldShowError && (
+        <div className="error-message">
+          {customError || errorMessage}
+        </div>
+      )}
+    </div>
+  );
+};
+
+export default FormField;

src/index.css

@@ -20,9 +20,5 @@
 }
 
 body {
-  margin: 0;
-  display: grid;
-  place-items: center;
-  min-width: 320px;
-  min-height: 100vh;
+  display: flex;
 }

src/pages/login/login.css

@@ -0,0 +1,16 @@
+.login-div {
+  display: flex;
+  height: 100%;
+  justify-content: flex-end;
+  align-items: center;
+  border: 1px solid green;
+}
+
+.login-right-div {
+  display: flex;
+  height: 100%;
+  justify-content: flex-end;
+  align-items: center;
+  flex-direction: column;
+  border: 1px solid blue;
+}

src/pages/login/login.tsx

@@ -5,6 +5,9 @@ import { toast } from "react-toastify"
 
 import useAuth from "../../auth/auth";
 
+import FormField from "../../components/FormField"
+import "./login.css"
+
 
 const Login = () => {
   const { setToken } = useAuth();
@@ -13,9 +16,20 @@ const Login = () => {
   const navigate = useNavigate();
   const location = useLocation();
 
+  const [usernameEmpty, setUsernameEmpty] = useState(false);
+  const [passwordEmpty, setPasswordEmpty] = useState(false);
+
   const from = location.state?.from?.pathname || "/";
 
-  const handleSubmit = () => {
+  const handleSubmit = (e: React.FormEvent) => {
+    e.preventDefault();
+
+    if (!username || !password) {
+      if (!username) setUsernameEmpty(true);
+      if (!password) setPasswordEmpty(true);
+      return;
+    }
+
     // TODO: request to API
     if ((username === "admin" && password === "1234") || (username === "a" && password === "a")) {
       const token = "todo.jwt.token";
@@ -27,46 +41,49 @@ const Login = () => {
   };
 
   return (
-    <div style={{
-        display: "flex",
-        justifyContent: "right",
-        alignItems: "center",
-        minHeight: "100vh",
-        flexDirection: "column",
-        gap: "15px",
-        margin: "0 15px"
-    }}>
-      <h2>Login</h2>
-      <form onSubmit={(e) => {e.preventDefault(); handleSubmit()}}
-        id="form-id"
+    <div className="login-right-div">
+      <h2
+        style={{
+          display: "flex"
+        }}
+      >
+        Login
+      </h2>
+      <form onSubmit={handleSubmit}
         style={{
           flexDirection: "column",
           display: "flex",
-          gap: "5px",
-          width: "100%",
-          maxWidth: "400px",
+          gap: "10px",
           alignItems: "center",
         }}
+        noValidate
       >
-        <div>
-          <input
-            type="text"
-            placeholder=" Username"
-            value={username}
-            onChange={(e) => setUsername(e.target.value)}
-            required
+        <FormField
+          type="text"
+          placeholder="Username"
+          value={username}
+          onChange={(e) => setUsername(e.target.value)}
+          required
+          showError={usernameEmpty}
+          errorMessage="Please enter your username"
+          className="test1"
           />
-        </div>
-        <div>
-          <input
-            type="password"
-            placeholder=" Password"
-            value={password}
-            onChange={(e) => setPassword(e.target.value)}
-            required
+        <FormField
+          type="password"
+          placeholder="Password"
+          value={password}
+          onChange={(e) => setPassword(e.target.value)}
+          required
+          showError={passwordEmpty}
+          errorMessage="Please enter your password"
+          className="test2"
           />
-        </div>
-        <button type="submit" style={{ marginTop: "10px" }}>
+        <button type="submit"
+          style={{
+            display: "flex",
+            marginTop: "10px"
+          }}
+        >
           Login
         </button>
       </form>