将本地json数据从终端加载到d3.js和webpack

时间:2017-08-13 14:46:15

标签: javascript json node.js d3.js

我有一个使用本地json文件的 d3.js 制作的图表。

为了可视化数据,我必须使用Web服务器,所以我决定使用 webpack ,因为它还支持热重载。

问题是我仅限于所选文件(data.json),因为它是输入点(index.js)中显示的文件:

index.js

d3.json("data.json", function(error, d) {
    // get data and draw chart

当我想要显示图表时,我使用npm start并转到localhost:8080

的package.json

{
  "name": "tutorial",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "webpack-dev-server",
    "build": "babel src -d lib",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "babel-cli": "^6.24.1",
    "babel-preset-env": "^1.3.3",
    "copy-webpack-plugin": "^4.0.1",
    "css-loader": "^0.28.0",
    "style-loader": "^0.16.1"
  }
}

webpack.config.js

const path = require('path');
const CopyWebpackPlugin = require('copy-webpack-plugin')
const HtmlWebpackPlugin = require('html-webpack-plugin')
const HtmlWebpackPluginConfig = new HtmlWebpackPlugin({
  template: './src/index.html',
  filename: 'index.html',
  inject: 'body'
})
module.exports = { 
  entry: './src/index.js', 
  output: { 
    path: path.resolve('dist'), 
    filename: 'index_bundle.js'
  }, 
  module: { 
    loaders: [ 
      { test: /\.js$/, 
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      { test:/\.css$/,
        loader: ['style-loader', 'css-loader'],
        exclude: /node_modules/
      },
    ]
  }, 
  plugins: [
    HtmlWebpackPluginConfig,
    new CopyWebpackPlugin([
      { from: 'src/data.json'}
    ])
    ]
}

我怎样才能将json文件作为参数传递?类似的东西:

npm start "another_data.json"

还是与节点?

node "another_data.json"

1 个答案:

答案 0 :(得分:0)

您可以使用process.argv,它是包含所有命令行参数的数组。 你可以尝试:

process.argv.forEach(function (item, index) {
  console.log(index + ': ' + val);
});

所以如果你打电话给node app.js "ok" "non",你会得到类似的东西:

0: /usr/src/node/node-v4.4.7-linux-x64/bin/node
1: /home/scrapbook/tutorial/app.js
2: ok
3: non

或者使用npm:

{
  "name": "adsf",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "special": "node app.js"
  },
  "author": "",
  "license": "ISC"
}

使用app.js:

console.log(process.env.npm_config_myVar);

致电npm run special --myVar="special.js"

结果应该是:

special.js