Bugfix: Navbar Unresponsive - DAV-1000/react-material GitHub Wiki

Email validation example

Created: 8/5/2025 18:07
Updated: 8/5/2025 19:09
Exported: 8/14/2025 14:08
Link: https://chatgpt.com/c/68923a19-ed48-8327-bbcb-4f3ac057c39e

Prompt:

In my Typescript React Material UI app I have this text box and button. I want to validate that the user has entered a valid email address when the button is clicked: <TextField id="email-newsletter" hiddenLabel size="small" variant="outlined" fullWidth aria-label="Enter your email address" placeholder="Your email address" slotProps={{ htmlInput: { autoComplete: "off", "aria-label": "Enter your email address", }, }} sx={{ width: "250px" }} /> <Button variant="contained" color="primary" size="small" sx={{ flexShrink: 0 }} > Subscribe

Response:

Got it! You want to validate the email entered in the TextField when the Subscribe button is clicked.

Here’s a simple approach:

  1. Use React state to keep track of the input value.
  2. Add a click handler to the button that validates the email.
  3. Show an error on the TextField if the email is invalid.

Here's a minimal example using your code with email validation:

import React, { useState } from "react";
import { TextField, Button } from "@mui/material";

const EmailSubscribe = () => {
  const [email, setEmail] = useState("");
  const [error, setError] = useState(false);

  const validateEmail = (email: string) => {
    // Simple email regex validation
    const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return re.test(email.toLowerCase());
  };

  const handleSubscribe = () => {
    if (validateEmail(email)) {
      setError(false);
      // Proceed with your subscribe logic here
      alert("Subscribed with email: " + email);
    } else {
      setError(true);
    }
  };

  return (
    <>
      <TextField
        id="email-newsletter"
        hiddenLabel
        size="small"
        variant="outlined"
        fullWidth
        aria-label="Enter your email address"
        placeholder="Your email address"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
        error={error}
        helperText={error ? "Please enter a valid email address" : ""}
        slotProps={{
          htmlInput: {
            autoComplete: "off",
            "aria-label": "Enter your email address",
          },
        }}
        sx={{ width: "250px" }}
      />
      <Button
        variant="contained"
        color="primary"
        size="small"
        sx={{ flexShrink: 0, mt: 1 }}
        onClick={handleSubscribe}
      >
        Subscribe
      </Button>
    </>
  );
};

export default EmailSubscribe;

How it works:

  • email state stores the text input.
  • error state triggers the error UI on the TextField.
  • On button click, it checks if the email matches a regex pattern.
  • If invalid, shows the error and helper text.

Want me to help you integrate this into your existing app or improve the validation?

Prompt:

Abstract it to a separate component in its own file

Response:

Sure — we can move your email input + subscribe button into a reusable EmailSubscribe.tsx component and then import it wherever you need it.

Here’s how you could structure it:

src/components/EmailSubscribe.tsx

import React, { useState } from "react";
import { TextField, Button, Box } from "@mui/material";

interface EmailSubscribeProps {
  onSubscribe: (email: string) => void;
}

const EmailSubscribe: React.FC<EmailSubscribeProps> = ({ onSubscribe }) => {
  const [email, setEmail] = useState("");
  const [error, setError] = useState(false);

  const validateEmail = (email: string) => {
    // Basic regex for email format validation
    const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return re.test(email.toLowerCase());
  };

  const handleSubscribe = () => {
    if (validateEmail(email)) {
      setError(false);
      onSubscribe(email);
      setEmail(""); // Clear after successful submit
    } else {
      setError(true);
    }
  };

  return (
    <Box display="flex" flexDirection="column" alignItems="flex-start" gap={1}>
      <TextField
        id="email-newsletter"
        hiddenLabel
        size="small"
        variant="outlined"
        fullWidth
        aria-label="Enter your email address"
        placeholder="Your email address"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
        error={error}
        helperText={error ? "Please enter a valid email address" : ""}
        slotProps={{
          htmlInput: {
            autoComplete: "off",
            "aria-label": "Enter your email address",
          },
        }}
        sx={{ width: "250px" }}
      />
      <Button
        variant="contained"
        color="primary"
        size="small"
        sx={{ flexShrink: 0 }}
        onClick={handleSubscribe}
      >
        Subscribe
      </Button>
    </Box>
  );
};

export default EmailSubscribe;

Example usage in a page or parent component:

import React from "react";
import EmailSubscribe from "./components/EmailSubscribe";

const NewsletterSection = () => {
  const handleEmailSubscribe = (email: string) => {
    // Replace with your API call or subscription logic
    alert(`Subscribed with: ${email}`);
  };

  return (
    <div>
      <h2>Join Our Newsletter</h2>
      <EmailSubscribe onSubscribe={handleEmailSubscribe} />
    </div>
  );
};

export default NewsletterSection;

This way:

  • Reusable — EmailSubscribe can be dropped anywhere in your app.
  • Customizable — The parent component decides what to do when an email is valid (e.g., call an API).
  • Encapsulated — Validation, error state, and input handling live inside the component.

If you want, I can make it fully flexible so you can also pass in custom button text, placeholder text, and regex patterns without changing the component code. Would you like me to do that?

Prompt:

I want the Subscribe button to be positioned to the right of the text box. It is currently showing below it

Response:

Gotcha — that’s happening because in the EmailSubscribe component we set flexDirection="column" in the Box, which stacks elements vertically.

If you want the TextField and Button side-by-side with the button on the right, you just need to change the flex direction and tweak spacing.

Here’s the updated EmailSubscribe.tsx:

import React, { useState } from "react";
import { TextField, Button, Box } from "@mui/material";

interface EmailSubscribeProps {
  onSubscribe: (email: string) => void;
}

const EmailSubscribe: React.FC<EmailSubscribeProps> = ({ onSubscribe }) => {
  const [email, setEmail] = useState("");
  const [error, setError] = useState(false);

  const validateEmail = (email: string) => {
    const re = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
    return re.test(email.toLowerCase());
  };

  const handleSubscribe = () => {
    if (validateEmail(email)) {
      setError(false);
      onSubscribe(email);
      setEmail("");
    } else {
      setError(true);
    }
  };

  return (
    <Box display="flex" alignItems="center" gap={1}>
      <TextField
        id="email-newsletter"
        hiddenLabel
        size="small"
        variant="outlined"
        placeholder="Your email address"
        value={email}
        onChange={(e) => setEmail(e.target.value)}
        error={error}
        helperText={error ? "Please enter a valid email address" : ""}
        slotProps={{
          htmlInput: {
            autoComplete: "off",
            "aria-label": "Enter your email address",
          },
        }}
        sx={{ width: "250px" }}
      />
      <Button
        variant="contained"
        color="primary"
        size="small"
        sx={{ flexShrink: 0, height: "40px" }}
        onClick={handleSubscribe}
      >
        Subscribe
      </Button>
    </Box>
  );
};

export default EmailSubscribe;

Key changes:

  • Changed flexDirection="column" to display="flex" with alignItems="center".
  • Added gap={1} so there’s space between the text field and button.
  • Kept the text field a fixed width (250px) but you can make it responsive if needed.

If you want the error message to appear below the text field without moving the button down, we’d have to slightly restructure the layout — I can show that version too if you need.

Do you want me to make it so the helper text appears underneath without shifting the button’s position?

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