Material Design Lite with ReactJS (import/require Issue)

问题

I am trying to use Google's Material Design Lite with ReactJS. I am using Spinner Loading & Text Field Component of MDL library.

But, when I switch routes with React Router, the animation does not take place & when I refresh the page, it works fine. I think, this is probably because MDL components are not getting upgraded. Then, I am trying to use componentHandler.upgradeDom(), but Console throws an error, app.js:27160 Uncaught TypeError: Cannot read property 'upgradeDom' of undefined.

Here is the code,

var React = require('react');
var ReactDOM = require('react-dom');
var PropTypes = React.PropTypes;
var MDLite = require('material-design-lite');
var componentHandler = MDLite.componentHandler;

var styles = {
  loader: {
    marginTop: '70px',
  }
}

var Loading = React.createClass({
  render: function() {
    return (
      <div className="mdl-spinner mdl-js-spinner is-active" style={styles.loader}></div>
    );
  },
  componentDidMount: function() {
    componentHandler.upgradeDom();
  },
});

module.exports = Loading;

I also tried to log MDLite variable in Console with console.log(MDLite). But, it is showing me an empty Object {}. I am using webpack & have installed Material Design Lite with NPM, npm install material-design-lite --save.

My question is how can I import/require MDL properly & use componentHandler.upgradeDom()?

回答1:

I figured out the solution myself. There are two ways through which you can achieve this.

The Lazy Way

In node_modules/material-design-lite/material.js, edit & add the following code in the end as mentioned below.

// You can also export just componentHandler
if (typeof module === 'object') {
  module.exports = window;
}

Your material.js file will look like this.

;(function() {
  .
  .
  .
  componentHandler.register({
    constructor: MaterialRipple,
    classAsString: 'MaterialRipple',
    cssClass: 'mdl-js-ripple-effect',
    widget: false
  });

  // You can also export just componentHandler
  if (typeof module === 'object') {
    module.exports = window;
  }

}());

In your React Component file, require like this,

var MDLite = require('material-design-lite/material');
var componentHandler = MDLite.componentHandler;

Then, you can call componentHandler.upgradeDom() to upgrade MDL elements.

Note that you can also write module.exports = componentHandler; if you only want to import componentHandler.

The Webpack Way

Personally, I would prefer the webpack way as it is much cleaner & you need not to edit the module files yourself.

Install exports-loader, npm install exports-loader --save-dev. Then, in your webpack.config.js, specify loaders as

loaders: [
  {
    test: /\.js$/,
    exclude: /node_modules/,
    loader: 'exports-loader!babel-loader'
  }
]

In your React Component file, you can require componentHandler as

var componentHandler = require('exports?componentHandler!material-design-lite/material');

I hope it helps!

来源：https://stackoverflow.com/questions/36809425/material-design-lite-with-reactjs-import-require-issue

标签

javascript

reactjs

npm

Webpack

material-design-lite