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Material UI

Material UI — Text Field Customization

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Material UI is a Material Design library made for React.

It’s a set of React components that have Material Design styles.

In this article, we’ll look at how to add text fields with Material UI.

Sizes

We can change the size of a text field with the size prop.

For example, we can write:

import React from "react";
import TextField from "@material-ui/core/TextField";

export default function App() {
  return (
    <div className="App">
      <TextField label="Size" id="small" defaultValue="Small" size="small" />
    </div>
  );
}

to add a text field with the size small .

Layout

We can layout our text fields our way.

To do that, we can write:

import React from "react";
import TextField from "@material-ui/core/TextField";
import { makeStyles } from "@material-ui/core/styles";

const useStyles = makeStyles(theme => ({
  root: {
    display: "flex",
    flexWrap: "wrap"
  },
  textField: {
    marginLeft: theme.spacing(1),
    marginRight: theme.spacing(1),
    width: "25ch"
  }
}));

export default function App() {
  const classes = useStyles();

return (
    <>
      <div>
        <TextField
          id="filled-full-width"
          label="Label"
          style={{ margin: 8 }}
          placeholder="Placeholder"
          helperText="Full width!"
          fullWidth
          margin="normal"
          InputLabelProps={{
            shrink: true
          }}
          variant="filled"
        />
        <TextField
          label="None"
          id="filled-margin-none"
          defaultValue="foo"
          className={classes.textField}
          helperText="foo"
        />
        <TextField
          label="Dense"
          style={{ margin: 3 }}
          id="filled-margin-dense"
          defaultValue="bar"
          className={classes.textField}
          helperText="bar"
          margin="dense"
        />
      </div>
    </>
  );
}

to add text fields.

We have one full-width text field at the top and 2 shorter ones at the bottom.

They have the usual props, which have the helperText for the hint.

margin have the margin.

We also have some styles to change the margins.

className have the class names.

placeholder have the placeholder for the text fields.

variant can be filled or not.

margin can be smaller than the default with dense .

Uncontrolled vs Controlled

Text fields can be uncontrolled, which means that it doesn’t have any state attached to it.

Or it can be controlled, which means that it has state attached to it.

To make a controlled text field, we can add the value and onChange props to the TextField .

For example, we can write:

import React from "react";
import TextField from "@material-ui/core/TextField";

export default function App() {
  const [name, setName] = React.useState("james");
  const handleChange = event => {
    setName(event.target.value);
  };
  return (
    <>
      <div>
        <TextField
          id="standard-name"
          label="Name"
          value={name}
          onChange={handleChange}
        />
      </div>
    </>
  );
}

We have the name state which is passed into the value prop.

And the handleChange function which is passed into the onChange prop.

Then when we type something in, the handleChange function will run and call setName to update the name state.

Components

A TextField is made of smaller components.

They include FormControl , Input , FilledInput , InputLabel , OutlinedInput and FormHelperText .

For instance, we can substitute a TextField with:

import React from "react";
import FormControl from "@material-ui/core/FormControl";
import Input from "@material-ui/core/Input";
import InputLabel from "@material-ui/core/InputLabel";
export default function App() {
  const [name, setName] = React.useState("james");
  const handleChange = event => {
    setName(event.target.value);
  };
  return (
    <>
      <div>
        <FormControl>
          <InputLabel htmlFor="input">Name</InputLabel>
          <Input id="input" value={name} onChange={handleChange} />
        </FormControl>
      </div>
    </>
  );
}

We have an Input for the input box and InputLabel for the label for the input box.

To add hint text, we can use the FormHelperText component:

import React from "react";
import FormControl from "@material-ui/core/FormControl";
import Input from "@material-ui/core/Input";
import InputLabel from "@material-ui/core/InputLabel";
import FormHelperText from "@material-ui/core/FormHelperText";

export default function App() {
  const [name, setName] = React.useState("james");
  const handleChange = event => {
    setName(event.target.value);
  };
  return (
    <>
      <div>
        <FormControl>
          <InputLabel htmlFor="input">Name</InputLabel>
          <Input id="input" value={name} onChange={handleChange} />
          <FormHelperText>enter your name</FormHelperText>
        </FormControl>
      </div>
    </>
  );
}

We can also use the OutlinedInput and FilledInput components to add input boxes with those varieties:

import React from "react";
import FormControl from "@material-ui/core/FormControl";
import OutlinedInput from "@material-ui/core/OutlinedInput";
import InputLabel from "@material-ui/core/InputLabel";
import FormHelperText from "@material-ui/core/FormHelperText";

export default function App() {
  const [name, setName] = React.useState("james");
  const handleChange = event => {
    setName(event.target.value);
  };
  return (
    <>
      <div>
        <FormControl>
          <InputLabel htmlFor="input">Name</InputLabel>
          <OutlinedInput
            id="input"
            value={name}
            onChange={handleChange}
            label="Name"
          />
          <FormHelperText>enter your name</FormHelperText>
        </FormControl>
      </div>
    </>
  );
}

to add an input box with the outline to the box.

And we can use the FilledInput to add an input box with the background:

import React from "react";
import FormControl from "@material-ui/core/FormControl";
import FilledInput from "@material-ui/core/FilledInput";
import InputLabel from "@material-ui/core/InputLabel";
import FormHelperText from "@material-ui/core/FormHelperText";

export default function App() {
  const [name, setName] = React.useState("james");
  const handleChange = event => {
    setName(event.target.value);
  };
  return (
    <>
      <div>
        <FormControl>
          <InputLabel htmlFor="input">Name</InputLabel>
          <FilledInput id="input" value={name} onChange={handleChange} />
          <FormHelperText>enter your name</FormHelperText>
        </FormControl>
      </div>
    </>
  );
}

Conclusion

A TextField is composed of many form components.

Therefore, we can add those instead of a TextField .

We can also make a text field and controller input.

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