Styling the placeholder in a TextField

问题:

The TextField API doesn't mention anything about how one could style the pseudo placeholder element of the input element.

Basically, I would like to change the default styling of the placeholder text, and the normal bag of tricks doesn't work, as I cannot access the element.

Is there a way I can get to it? And if so, what is the JSS/React/DOM equivalent way of writing ::-webkit-input-placeholder?

回答1:

Case 1

Put the desired placeholder text in the label property of the TextField component, and use the labelClassName property of the TextField to customize it. You could also pass InputLabelProps with a className, classes or style attribute.

Case 2

Refrain from using the label property of TextField and put the placeholder text on its placeholder property instead. Rely on InputProps to override the generated HTML input element's class.

Code

The code below covers both aforementioned cases. CodeSandbox snippet.

import React from 'react';
import TextField from 'material-ui/TextField';
import { withStyles } from 'material-ui/styles';
import withRoot from '../components/withRoot';

const styles = {
  'input-label': {
    textOverflow: 'ellipsis',
    whiteSpace: 'nowrap',
    overflow: 'hidden',
    width: '100%',
    color: 'red'
  },

  'input': {
    '&::placeholder': {
      textOverflow: 'ellipsis !important',
      color: 'blue'
    }
  }
};

class Index extends React.Component {
  render() {
    return <div style={ {width: 150, margin: '0 auto'} }>
      {/* Uses "label" and "labelClassName". */}
      <TextField
        fullWidth
        label='I am a really really long red TextField label'
        labelClassName={ this.props.classes['input-label'] } />

      {/* Uses "label" and InputLabelProps" with inline styles. */}
      <TextField
        fullWidth
        label='I am a really really long green TextField label'
        InputLabelProps={{
          style: {
            textOverflow: 'ellipsis',
            whiteSpace: 'nowrap',
            overflow: 'hidden',
            width: '100%',
            color: 'green'
          } }} />

      {/* Uses "placeholder" and "InputProps" with "classes". */}
      <TextField
        fullWidth
        margin='normal'
        placeholder='I am a really really long glue TextField label'
        InputProps={{ classes: {input: this.props.classes['input']} }} />
    </div>;
  }
}

export default withStyles(styles)(Index);

回答2:

I haven't found a proper answer to how I can access the inner input element, but as to how one could target the placeholder element using JSS, I found the answer in the source of the Input element, of which TextField is composed.

Basically, it's using the straight css names, just enclosed in quotes: '&::-webkit-input-placeholder': { color: 'blue' }

回答3:

you can add styling to your input using ::placeholder selector in css it'll work

::-webkit-input-placeholder { /* Chrome/Opera/Safari */
  color: pink;
}
::-moz-placeholder { /* Firefox 19+ */
  color: pink;
}
:-ms-input-placeholder { /* IE 10+ */
  color: pink;
}
:-moz-placeholder { /* Firefox 18- */
  color: pink;
}