How to 'require' an xml file (loaded by webpack) in order to read the xml contents in javascript

问题

I'm using webpack as the bundler for a app and using an XML file for it configuration. Currently I'm writing tests to retrieve the config from an XML file packaged by webpack.

Referencing this webpack article: Loading data the piece of code I'm having trouble is this:

import Data from './data.xml';

I'm my own test, I'm using the require form which is as follows:

const select = require('xpath.js');
const DOMParser = require('xmldom').DOMParser
const parser = new DOMParser();
const data = require('./app.config.xml'); // <- THIS IS MY PROBLEM
const xdocument = parser.parseFromString(data.toString(), 'text/xml');

How does 'require' work for an XML file?

This code:

console.log("DATA: " + data.toString());

produces this output:

DATA: [object Object]

So I don't know what object is being created by the require.

I have seen a lot of other code samples about reading xml into JSON, but I don't what to have to handle a JSON object. I want to interrogate the XML as an XMLObject so can run xpath queries against it.

I can easily, get to the JSON, by running

JSON.stringify(data)

which displays something like:

    {"Application":{"$":{"name":"config-data"},"Imports":[{"Import":[{"$":{"from":"./another.config.xml"}}]}],"Con

which is not what I want. So how can I get the XML content from *data* as a string, which is what **parser.parseFromString** needs?

My test code is as follows:

  describe.only('xpath examples (zenobia)', async assert => {
    const xdoc = require('./app.config.xml');

    let applicationNodes = select(xdoc, "/Application"); // THIS RETURNS a DOMObject
    console.log(`Found ${applicationNodes.length} Application elements`);

    assert({
      given: 'an inline xml document with an Application',
      should: 'Select an element from the root',
      condition: applicationNodes !== null
    });
  });

That log message displays:

Found 0 Application elements

for an XML document that is:

<?xml version="1.0"?>
<Application name="app">
  <Imports/>
</Application>

回答1:

If you want to read XML files as strings you can simply use Webpack raw-loader with the following confiuration

// webpack.config.js

module.exports = {
  module: {
    rules: [
      {
        test: /\.xml$/i,
        use: 'raw-loader',
      },
    ],
  },
};

Now data in

const data = require('./app.config.xml');

Should be the raw data from the XML file (i.e. a string) - the rest of your code should now work as expected

来源：https://stackoverflow.com/questions/55172425/how-to-require-an-xml-file-loaded-by-webpack-in-order-to-read-the-xml-conten

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xml

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