Butter

A tf-idf JavaScript library

Purpose

This is a javascript library that can be used for finding out (the most frequently used words on a webpage using tf-idf). It was initially made for recognizing cooking ingredients from recipes web sites, please modify for use in other domains.

Requirements

• jquery https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js
• underscoreJS http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js

Thanks

• ported from my python tf-idf library which was extended from TimTrueman's but w/ the addition of nltk
• stemmer - http://qaa.ath.cx/porter_js_demo.html
• sorting an object - http://wolfram.kriesing.de/blog/index.php/2008/javascript-sort-object-by-a-value
• stopwords library - http://tedserbinski.com/files/stopwords.js.txt with extensions for cooking recipe words
• fast dictionary look up js - http://stevehanov.ca/blog/index.php?id=120

Add this to the head section your webpage (change the library paths acorddingly), to see how it works

To Test this

	<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
  <script src="http://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js"></script>
  <script src="../lib/stopwords.js"></script>
  <script src="../lib/tfidf.js"></script>
  <script src="../lib/tokenize.js"></script>
  <script src="../lib/corpus_tools.js"></script>
  <script src="../lib/collections_tools.js"></script>
  <script src="../lib/stemmer-min.js"></script>
  <script src="../test_data/test_data.js"></script>
  <script>
    $(function() {
      var corpus = "";
      // if($('li.ingredient.type').length>0){
      //  alert(getTextNodesIn('.ingredient.type').text());
      // }
      if($('li.ingredient').length>0){ // here use recipes microformats
        var items = getTextNodesIn('li.ingredient').text()
        alert(items);
      }
      else{ // don't use recipes microformat, scan the whole text
        corpus  = getTextNodesIn('div').text();
        alert(analyze_web_text(corpus));
      }
  });
  </script>

TODO

• create a GreaseMonkey / Chrome Extension

resources

• food ingredients dictionary

more info about recipes

This library doens't need to make use of recipes microformat to work, but if you would like more info Recipes Microformat

Licence

MIT

### changelog 2013-03-01 Joyce Chan

• initial release