prompter: Create a React functional component that converts and image upload to base64.

assistant: Here's an example of a React functional component that converts an image upload to base64:

import React, { useState } from "react";

const ImageUpload = () => {
  const [image, setImage] = useState("");

  const handleImageChange = (event) => {
    const file = event.target.files[0];
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onloadend = () => {
      setImage(reader.result);
    };
  };

  return (
    <div>
      <input type="file" onChange={handleImageChange} />
      <br />
      <br />
      {image && <img src={image} alt="Uploaded Image" />}
    </div>
  );
};

export default ImageUpload;

This component has a handleImageChange function that is triggered when the file input is changed. It creates a FileReader object and uses the readAsDataURL method to read the selected file as base64 encoded data. The base64 encoded image is then set as the state for the component using the setImage function. The component also displays the image using an img element if the state is not empty.

prompter: Does this code need to check if a file-type other than an image file-type is uploaded?

prompter: I am not very familiar with React. Can you explain how the useState function works?

prompter: Can you annotate each line of the code that you provided with a comment that explains how that line works?

prompter: How would you integrate this into a form component so that the base64 value can be submitted to an API with other form values?

assistant: Here's an example of a React functional component that allows a user to select an image file and converts it to base64 format:

```javascript
import React, { useState } from 'react';

const ImageUpload = () => {
  const [image, setImage] = useState(null);

  const handleChange = (e) => {
    const reader = new FileReader();
    reader.onload = (event) => {
      setImage(event.target.result);
    };
    reader.readAsDataURL(e.target.files[0]);
  };

  return (
    <div>
      <input
        type="file"
        accept="image/*"
        onChange={handleChange}
      />
      { image
        && <img
          alt="Preview"
          src={image}
        />
      }
    </div>
  );
};

export default ImageUpload;
```

prompter: What does the code do and how does it work?

prompter: There is no conversion to base64, can you instruct me on how to add it?

assistant: This is a React component to convert image to base64 string. Leveraging Material UI Button upload. Credit goes to: https://gist.github.com/wambuguedison/a195f73f118dcae977e41aa5fbef1899

```
import Button from "@material-ui/core/Button";

class ImageConverter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      files: []
    };
    this.convert = this.convert.bind(this);
  }

  convert(e) {
    // check max. file size is not exceeded
    // size is in bytes
    if (files[0].size > 2000000) {
      console.log("File too large");
      return;
    }
    var reader = new FileReader();
    reader.readAsDataURL(e.target.files[0]);

    reader.onload = () => {
      console.log(reader.result); //base64encoded string
    };
    reader.onerror = error => {
      console.log("Error: ", error);
    };
  }
  render() {
    return (
      <>
        <input
          accept="image/*"
          style={{
            display: "none"
          }}
          id="button-file"
          type="file"
          onChange={this.convert}
        />
        <label htmlFor="button-file">
          <Button
            variant="contained"
            color="primary"
            component="span"
          >
            Add Additional Images
          </Button>
        </label>
      </>
    );
  }
}

export default ImageConverter;
```

prompter: Explain to me how the code works

prompter: Explain what this does in plain English.

prompter: When I plug this into codesandbox I get "Could not find dependency: '@material-ui/core' relative to '/src/App.js'"

assistant: The following code is one way to Create a React functional component that converts and image upload to base64:

import Button from "@material-ui/core/Button";

class ImageConverter extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      files: []
    };
    this.convert = this.convert.bind(this);
  }

  convert(e) {
    // check max. file size is not exceeded
    // size is in bytes
    if (files[0].size > 2000000) {
      console.log("File too large");
      return;
    }
    var reader = new FileReader();
    reader.readAsDataURL(e.target.files[0]);

    reader.onload = () => {
      console.log(reader.result); //base64encoded string
    };
    reader.onerror = error => {
      console.log("Error: ", error);
    };
  }
  render() {
    return (
      <>
        <input
          accept="image/*"
          style={{
            display: "none"
          }}
          id="button-file"
          type="file"
          onChange={this.convert}
        />
        <label htmlFor="button-file">
          <Button
            variant="contained"
            color="primary"
            component="span"
          >
            Add Additional Images
          </Button>
        </label>
      </>
    );
  }
}

export default ImageConverter;


This React component class ImageConverter provides a user interface to convert an image file to a base64-encoded string.
The component has the following features:

- a state files that stores an array of files selected by the user.
- a method convert that converts the selected image file to a base64-encoded string.
- the FileReader API to read the selected image file as a data URL.
- displays a file input field with a "Add Additional Images" button.
- is exported as the default export, so it can be imported and used in other parts of the application.

Note: @material-ui/core/Button is a Material-UI component that renders a button.

If you have any further questions, about this code, or proposed changes, I would be happy to continue helping.