Media Object from OOCSS and now Bootstrap written in React/jsx

media-object.jsx

'use strict';

var React = require('react/addons');
var _ = require('lodash');
var setClass = React.addons.classSet;

var MediaObject = React.createClass({
  render: function () {
    var classes = setClass({
      'media-left': this.props.horizontalAlignment === 'left',
      'media-right': this.props.horizontalAlignment === 'right',
      'media-middle': this.props.verticalAlignment === 'middle',
      'media-bottom': this.props.verticalAlignment === 'bottom',
      'media-object': !this.props.imageHref
    });

    var paddingClasses = setClass({
      'prs': this.props.leftMediaSpacing === 'small',
      'prm': this.props.leftMediaSpacing === 'medium',
      'prl': this.props.leftMediaSpacing === 'large',
      'prxl': this.props.leftMediaSpacing === 'xlarge',
      'pls': this.props.rightMediaSpacing === 'small',
      'plm': this.props.rightMediaSpacing === 'medium',
      'pll': this.props.rightMediaSpacing === 'large',
      'plxl': this.props.rightMediaSpacing === 'xlarge'
    });

    var mediaClasses = [classes, paddingClasses].join(' ');

    if (this.props.imageHref) {
      return (
        <a className={mediaClasses} href={this.props.imageHref} >
          <img alt={this.props.alt} className="media-object" src={this.props.imageSource} height={this.props.height} width={this.props.width} />
        </a>
        );
    } else {
      return (
        <img alt={this.props.alt} className={mediaClasses} src={this.props.imageSource} height={this.props.height} width={this.props.width} />
      );
    }
  }
});

var Media = React.createClass({
  render: function () {
    var leftMedia,
        rightMedia = '';

    var classes = setClass({
      'media': true,
      'media-stackable-xs': this.props.stackSize === 'xsmall',
      'media-stackable-sm': this.props.stackSize === 'small',
      'media-stackable-md': this.props.stackSize === 'medium',
      'media-stackable-lg': this.props.stackSize === 'large'
    });

    var bodyClasses = setClass({
      'media-body': true,
      'media-middle': this.props.bodyAlignment === 'middle',
      'media-bottom': this.props.bodyAlignment === 'bottom'
    });

    if (this.props.leftImageSource) {
      leftMedia = (
        <MediaObject
          horizontalAlignment='left'
          verticalAlignment={this.props.leftImageAlignment}
          imageHref={this.props.leftImageHref}
          imageSource={this.props.leftImageSource}
          leftMediaSpacing={this.props.leftMediaSpacing}
          alt={this.props.leftAlt}
          height={this.props.leftImageHeight}
          width={this.props.leftImageWidth}>

        </MediaObject>
      );
    }

    if (this.props.rightImageSource) {
      rightMedia = (
        <MediaObject
          horizontalAlignment='right'
          verticalAlignment={this.props.rightImageAlignment}
          imageHref={this.props.rightImageHref}
          imageSource={this.props.rightImageSource}
          rightMediaSpacing={this.props.rightMediaSpacing}
          alt={this.props.rightAlt}
          height={this.props.rightImageHeight}
          width={this.props.rightImageWidth}>
        </MediaObject>
      );
    }

    return (
      <div {...this.props} className={classes}>
        {leftMedia}
        <div className={bodyClasses}>
          {this.props.children}
        </div>
        {rightMedia}
      </div>
    );
  }
});

module.exports = {
  Media: Media
};

We think the validations will be simpler with an <Image /> component, something like:

  optionalUnion: React.PropTypes.oneOfType([
      React.PropTypes.instanceOf(Image),
      React.PropTypes.instanceOf(Svg),
      React.PropTypes.instanceOf(Icon)
    ]),

But yeah, that will have to wait...

To check if a ReactElement has a particular type, check its .type property:

var img = <Image />;
img.type === Image  // true

There's no built-in PropTypes validator to check for an element with a particular type.

You need to be really careful when checking against the type field of a ReactElement. When done the naive way, it prevents you from writing abstractions.

For example, if you only accept a prop img that satisfies img.type === Image, then it only accepts a literal <Image ...> component. But it won't accept a higher level component like <ProfilePicture> that eventually renders an <Image> component.

@spicyj @vjeux I'm having difficulty getting a ReactElement to return its type the way you specified... my reproduction produced the following:

var img = <Image />
img.type === Image // false
console.log(img.type)

outputs...

function (props) {
      // This constructor is overridden by mocks. The argument is used
      // by mocks to assert on what gets mounted. This will later be used
      // by the stand-alone class implementation.
}

which comes from ReactClass.js. Would love any feedback to clarify my understanding of how to use the type field of ReactElements!