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问题:

I'm building a Chrome Packaged App. I want to put the script configuration if a config file in a resource directory and on startup want to read that by Javascript.

For example

Project
- WebContent
  - index.html
  - manifest.json
  - main.js
  - resource
    - config.properties

Here I want main.js to load config.properties file in the beginning and get key-value pairs.

Have anyone done something like this?

回答1:

There is a super simple way to do this, along the lines of sowbug's answer, but which doesn't need any XHR or file reading.

Step 1. Create resource/config.js like so:

gOptions = {
  // This can have nested stuff, arrays, etc.
  color: 'red',
  size: 'big',
  enabled: true,
  count: 5
}

Step 2. Include this file in your index.html:

<!doctype html>
<head>
  <script src="resource/config.js"></script>
  ...

Step 3. Access your options directly from your main.js (or anywhere):

  ...
  if (gOptions.enabled) {
    for (var i = 0; i < gOptions.count; i++) {
      console.log(gOptions.color);
    }
  }
  ...

回答2:

You can use messageResource.js, a simple javascript library created by me for loading properties file.

1) Include messageResource.js in your index.html.

<script src="messageResource.min.js"></script>

2) You can get key-value pairs of config.properties from main.js using the following code.

// initialize messageResource.js  
messageResource.init({
  // path to directory containing config.properties
  filePath : 'resource'
});

// load config.properties file
messageResource.load('config', function(){ 
  // load file callback 

  // get value corresponding  to a key from config.properties  
  var value = messageResource.get('key', 'config');
});

回答3:

Structure the file as JSON. Read it into a string using the File API or XHR. Then JSON.parse(string).

Loading local content through XHR in a Chrome packaged app
http://blog.teamtreehouse.com/reading-files-using-the-html5-filereader-api

回答4:

It is pretty simple with JSF, but you will have to modify the HTML file every time you need a new parameter to be read from JavaScript. My property file (config.properties) in project directory has the following parameter as a key value pair.

parameter.key=parameter.value

The property file name is configured in faces-config.xml

<application>
    <resource-bundle>
        <base-name>com.example.project.properties.config</base-name>
        <var>configuration</var>
    </resource-bundle>
</application>

Therefore, you can use a property value in a hidden input inside the HTML file.

<h:inputHidden id="parameter_key" value="#{configuration['parameter.key']}" />

And from JavaScript function, use the following line to read the parameter value.

var parameter_value = document.getElementById("parameter_key").value;

Enjoy your day..!!!

How to read a properties file in javascript from p

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