ReactJS - how create two or more components in same page

I'm new user of ReactJS and I bumped in a point. I'm creating a generic map component, it works perfectly. However, only can render one component by page. I would like to instead use getElementById, I could use getElementsByClassName.

Is it possible? I would like to leave my system generic, where I use many components in same page.

In the example, I use to render 1 map, but if I want to use with 2 or more maps?

<div class="MyMap" comp-url="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3538.7513696363594"></div>
<div class="MyMap" comp-url="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d322231313138.7513696363594"></div>

I would like to use:

ReactDOM.render( React.createElement(MyMap, null) , document.getElementsByClassName('MyMap'));

Code with 1 map example:

/******/ (function(modules) { // webpackBootstrap
/******/ 	// The module cache
/******/ 	var installedModules = {};

/******/ 	// The require function
/******/ 	function __webpack_require__(moduleId) {

/******/ 		// Check if module is in cache
/******/ 		if(installedModules[moduleId])
/******/ 			return installedModules[moduleId].exports;

/******/ 		// Create a new module (and put it into the cache)
/******/ 		var module = installedModules[moduleId] = {
/******/ 			exports: {},
/******/ 			id: moduleId,
/******/ 			loaded: false
/******/ 		};

/******/ 		// Execute the module function
/******/ 		modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);

/******/ 		// Flag the module as loaded
/******/ 		module.loaded = true;

/******/ 		// Return the exports of the module
/******/ 		return module.exports;
/******/ 	}


/******/ 	// expose the modules object (__webpack_modules__)
/******/ 	__webpack_require__.m = modules;

/******/ 	// expose the module cache
/******/ 	__webpack_require__.c = installedModules;

/******/ 	// __webpack_public_path__
/******/ 	__webpack_require__.p = "";

/******/ 	// Load entry module and return exports
/******/ 	return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports) {

	var MyMap = React.createClass({displayName: "MyMap",
	  getDefaultProps: function() {
	    return {
	      widthMap: 600,
	      heightMap: 450
	    }
	  },
	  getInitialState: function() {
	    return {
	      url: ''
	    }
	  },
	  componentWillMount: function() {
	    if ($('#MyMap').attr('comp-url') !== undefined) {
	      this.state.url = $('#MyMap').attr('comp-url');
	    }
	    this.setState({});
	  },
	  render: function() {
	    return (React.createElement("iframe", {src: this.state.url, width: this.props.widthMap, height: this.props.heightMap, frameborder: "0", allowfullscreen: true}));
	  }
	});

	ReactDOM.render( React.createElement(MyMap, null) , document.getElementById('MyMap'));

/***/ }
/******/ ]);

<html>

<head>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
  <script src="https://facebook.github.io/react/js/react.js"></script>
  <script src="https://facebook.github.io/react/js/react-dom.js"></script>
</head>

<body>
  <div id="a"></div>
  <div id="MyMap" comp-url="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d3538.7513696363594!2d-48.51497268432733!3d-27.508106824924692!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x952746f0c86515b1%3A0xe8ccb33700020efe!2sCorporate+Park!5e0!3m2!1spt-BR!2sbr!4v1448470435091"></div>
</body>

</html>

You can just iterate the result from getElementsByClassName:

function renderEls(elements) {
    for (var i = 0; i < elements.length; i++) {
        if( $(elements[i]).attr('comp-url') !== undefined ) {
            var url = $(elements[i]).attr('comp-url');
        }
        ReactDOM.render(<MyMap url={url} />, elements[i]);
    }
}

renderEls(document.getElementsByClassName("MyMap"));

I use jsx with react, you can create a react component that holds all your maps

var MapContainer = React.createClass({
    renderMyMaps: function() {
        return this.props.myMaps.map( function(map, index) {
            return <MyMap url={map.url} widthMap={} heightMap={}/>
            }
        )
    }

    render: function() {
        return (
            <div className="mapContainer">
                { this.renderMyMaps() }
            </div>
        )
    }
})

var MyMap = React.createClass({displayName: "MyMap",
    getDefaultProps: function() {
        return {
            widthMap: 600,
            heightMap: 450
        }
    },
    getInitialState: function() {
        return {
            url: ''
        }
    },
    render: function() {
        return (
            <iframe
                src={this.props.url}
                width={this.props.widthMap}
                height={this.props.heightMap}
                frameborder=0
                allowfullscreen={true} />
        );
    }
});


var maps = [
    {url: '', widthMap: '', heightMap: ''},
    ...
]

ReactDOM.render(<MapContainer myMaps={maps} />,document.getElementById('MyMap'));

with this approach, it might be easier for you to just add to the myMaps property.

you can also just create a container that will output its children.

render(){
    return (
        <div className="MapContainers">
            { this.props.children }
        </div>
    )
 }

the just put all the MyMap that you will create inside MapContainer

<MapContainer>
    <MyMap />
    ...
</MapContainer>

If you are using jQuery (I saw you included it on header), you can do this:

$(".MyMap").each(function() {
    ReactDOM.render(<MyMap url={$(this).attr('comp-url')} />, this);
});

来源：https://stackoverflow.com/questions/33922015/reactjs-how-create-two-or-more-components-in-same-page

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