karma-ng-html2js-preprocessor

A Karma plugin. Compile AngularJS templates to JavaScript on the fly.

karma-ng-html2js-preprocessor

Preprocessor for converting HTML files to AngularJS 1.x templates.

Note: If you are looking for a general preprocessor that is not tied to Angular, check out karma-html2js-preprocessor.

Note: If you are using Angular 2.x, use karma-redirect-preprocessor.

The easiest way is to keep karma-ng-html2js-preprocessor as a devDependency in your package.json. Just run

$ npm install karma-ng-html2js-preprocessor --save-dev
// karma.conf.js 
module.exports = function(config) {
  config.set({
    preprocessors: {
      '**/*.html': ['ng-html2js']
    },
 
    files: [
      '*.js',
      '*.html',
      '*.html.ext',
      // if you wanna load template files in nested directories, you must use this 
      '**/*.html'
    ],
 
    // if you have defined plugins explicitly, add karma-ng-html2js-preprocessor 
    // plugins: [ 
    //     <your plugins> 
    //     'karma-ng-html2js-preprocessor', 
    // ] 
 
    ngHtml2JsPreprocessor: {
      // strip this from the file path 
      stripPrefix: 'public/',
      stripSuffix: '.ext',
      // prepend this to the 
      prependPrefix: 'served/',
 
      // or define a custom transform function 
      // - cacheId returned is used to load template 
      //   module(cacheId) will return template at filepath 
      cacheIdFromPathfunction(filepath) {
        // example strips 'public/' from anywhere in the path 
        // module(app/templates/template.html) => app/public/templates/template.html 
        var cacheId = filepath.strip('public/', '');
        return cacheId;
      },
 
      // - setting this option will create only a single module that contains templates 
      //   from all the files, so you can load them all with module('foo') 
      // - you may provide a function(htmlPath, originalPath) instead of a string 
      //   if you'd like to generate modules dynamically 
      //   htmlPath is a originalPath stripped and/or prepended 
      //   with all provided suffixes and prefixes 
      moduleName: 'foo'
    }
  })
}

Use function if more than one module that contains templates is required.

// karma.conf.js 
module.exports = function(config) {
  config.set({
    // ... 
 
    ngHtml2JsPreprocessor: {
      // ... 
 
      moduleNamefunction (htmlPathoriginalPath) {
        return htmlPath.split('/')[0];
      }
    }
  })
}

If only some of the templates should be placed in the modules, return '', null or undefined for those which should not.

// karma.conf.js 
module.exports = function(config) {
  config.set({
    // ... 
 
    ngHtml2JsPreprocessor: {
      // ... 
 
      moduleNamefunction (htmlPathoriginalPath) {
        var module = htmlPath.split('/')[0];
        return module !== 'tpl' ? module : null;
      }
    }
  })
}

This preprocessor converts HTML files into JS strings and generates Angular modules. These modules, when loaded, puts these HTML files into the $templateCache and therefore Angular won't try to fetch them from the server.

For instance this template.html...

<div>something</div>

... will be served as template.html.js:

angular.module('template.html', []).run(function($templateCache) {
  $templateCache.put('template.html', '<div>something</div>')
})

See the ng-directive-testing for a complete example.


For more information on Karma see the homepage.