<Select> Placeholder customization

Question

<Select> Placeholder customization

For my react project, I am utilizing material-Ui and I am looking to have a placeholder that stands out by having grey text instead of black when compared to the selected item.

<Select
name="answer"
value={values.answer}
onChange={handleChange}
onBlur={handleBlur}
displayEmpty
className={styles.selectEmpty}
>
<MenuItem
value=""
disabled
className={styles.selectPlaceholderText}
>
Answering your Question
</MenuItem>
<MenuItem value={"1"}>1</MenuItem>
<MenuItem value={"2"}>2</MenuItem>
<MenuItem value={"3"}>3</MenuItem>
<MenuItem value={"4"}>4</MenuItem>
</Select>

This method gets me close to what I desire, but there are still some issues:

The "Answer" placeholder is present as a disabled list item, which I do not want in the list at all.
Although it initially appears as desired, its color remains black instead of grey even after styling it with selectPlaceholderText.

javascript css reactjs material-ui

Answer 1

Answer №1

Applying styles using a className on the MenuItem element won't work because the default display behavior of the selected menu item displays its children. To apply styling, you need to wrap the text within the MenuItem in a div or span.

If you want to completely remove an item from the list, you can utilize the renderValue prop to control how the selected item is rendered. In the provided example, the renderValue property is set to undefined when a value is selected to maintain default behavior. When no value is selected, it renders the Placeholder component instead.

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

const usePlaceholderStyles = makeStyles(theme => ({
  placeholder: {
    color: "#aaa"
  }
}));

const Placeholder = ({ children }) => {
  const classes = usePlaceholderStyles();
  return <div className={classes.placeholder}>{children}</div>;
};
export default function SimpleSelect() {
  const [answer, setAnswer] = React.useState("");

  return (
    <Select
      value={answer}
      displayEmpty
      onChange={event => setAnswer(event.target.value)}
      renderValue={
        answer !== "" ? undefined : () => <Placeholder>Answer</Placeholder>
      }
    >
      <MenuItem value={"1"}>1</MenuItem>
      <MenuItem value={"2"}>2</MenuItem>
      <MenuItem value={"3"}>3</MenuItem>
    </Select>
  );
}

https://codesandbox.io/s/select-displayempty-placeholder-vgng5?fontsize=14

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Material UI Multi-Select different code value and visible value - show keys instead values
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Answer 2

Applying styles using a className on the MenuItem element won't work because the default display behavior of the selected menu item displays its children. To apply styling, you need to wrap the text within the MenuItem in a div or span.

If you want to completely remove an item from the list, you can utilize the renderValue prop to control how the selected item is rendered. In the provided example, the renderValue property is set to undefined when a value is selected to maintain default behavior. When no value is selected, it renders the Placeholder component instead.

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

const usePlaceholderStyles = makeStyles(theme => ({
  placeholder: {
    color: "#aaa"
  }
}));

const Placeholder = ({ children }) => {
  const classes = usePlaceholderStyles();
  return <div className={classes.placeholder}>{children}</div>;
};
export default function SimpleSelect() {
  const [answer, setAnswer] = React.useState("");

  return (
    <Select
      value={answer}
      displayEmpty
      onChange={event => setAnswer(event.target.value)}
      renderValue={
        answer !== "" ? undefined : () => <Placeholder>Answer</Placeholder>
      }
    >
      <MenuItem value={"1"}>1</MenuItem>
      <MenuItem value={"2"}>2</MenuItem>
      <MenuItem value={"3"}>3</MenuItem>
    </Select>
  );
}

https://codesandbox.io/s/select-displayempty-placeholder-vgng5?fontsize=14

Answer №2

Give this approach a try:

To display empty fields, utilize the displayEmpty prop and ensure that only one MenuItem has a blank value="".

     <Select
        displayEmpty
        name="owner"
        value={formik.values.owner}
        onChange={formik.handleChange}
        inputProps={{ 'aria-label': 'Case Owner' }} >

        <MenuItem value="" disabled>
          Select Owner
        </MenuItem>
        <MenuItem value={10}>Ten</MenuItem>
        <MenuItem value={20}>Twenty</MenuItem>
        <MenuItem value={30}>Thirty</MenuItem>
      </Select>

Answer 4

Give this approach a try:

To display empty fields, utilize the displayEmpty prop and ensure that only one MenuItem has a blank value="".

     <Select
        displayEmpty
        name="owner"
        value={formik.values.owner}
        onChange={formik.handleChange}
        inputProps={{ 'aria-label': 'Case Owner' }} >

        <MenuItem value="" disabled>
          Select Owner
        </MenuItem>
        <MenuItem value={10}>Ten</MenuItem>
        <MenuItem value={20}>Twenty</MenuItem>
        <MenuItem value={30}>Thirty</MenuItem>
      </Select>

Answer 5

Answer №3

I implemented a placeholder in this manner to streamline the code effectively. It achieved the desired outcome.


   <Select
        className="selection"
        labelId="selection"
        value={this.state.value}
        label="some selection"
        onChange={this.onSelectionChanged}
      >
        <option value="unset" selected disabled hidden>Placeholder</option>
        { this.getMenuItems()}
      </Select>

Answer 6

I implemented a placeholder in this manner to streamline the code effectively. It achieved the desired outcome.


   <Select
        className="selection"
        labelId="selection"
        value={this.state.value}
        label="some selection"
        onChange={this.onSelectionChanged}
      >
        <option value="unset" selected disabled hidden>Placeholder</option>
        { this.getMenuItems()}
      </Select>

<Select> Placeholder customization

Answer №1

Answer №2

Answer №3

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