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August 29, 2015 14:16
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;(function(window, document, undefined) { | |
'use strict'; | |
// ensure only one instance is running at a time | |
if (window._fz_wordcloud) return; | |
window._fz_wordcloud = true; | |
var MAX_WORDS = 50; | |
var BASE_FONT_SIZE = 12; | |
var words = document.body.innerText.toLowerCase() | |
.replace(/[\.,-\/#!$%\^&\*;:{}=\-_`~()?]/g, '').split(/[\s\/]+/g).sort(); | |
var counts = {}; | |
var result = []; | |
words.forEach(function(val) { | |
if (val.length < 4) return; | |
counts[val] = counts[val] ? counts[val] + 1 : 1; | |
}); | |
for (var word in counts) { | |
result.push({ word: word, count: counts[word] }); | |
} | |
function sortBy(array, property) { | |
return array.sort(function(a, b) { | |
if (a[property] < b[property]) return -1; | |
if (a[property] > b[property]) return 1; | |
return 0; // a[property] === b[property] | |
}); | |
} | |
// sort by count, return most used words, then sort alphabetically | |
result = sortBy(sortBy(result, 'count').slice(-MAX_WORDS), 'word'); | |
var container = document.createElement('div'); | |
var p = document.createElement('p'); | |
container.style.background = '#fff'; | |
container.style.position = 'fixed'; | |
container.style.top = 0; | |
container.style.right = 0; | |
container.style.width = '100%'; | |
container.style.height = '100%'; | |
container.style.zIndex = Number.MAX_SAFE_INTEGER || 9007199254740991; | |
p.style.fontColor = '#ccc'; | |
p.style.padding = '50px'; | |
p.style.width = '50%'; | |
p.style.textAlign = 'justify'; | |
p.style.margin = '0 auto'; | |
container.appendChild(p); | |
// display in div with font-size according to frequency | |
result.forEach(function(obj) { | |
var space = document.createTextNode(' '); | |
var span = document.createElement('span'); | |
span.innerText = obj.word; | |
span.style.fontSize = BASE_FONT_SIZE + obj.count + 'px'; | |
p.appendChild(space); | |
p.appendChild(span); | |
}); | |
document.body.appendChild(container); | |
// destroy the container on click | |
container.addEventListener('click', function(e) { | |
document.body.removeChild(container); | |
container.removeEventListener('click'); | |
window._fz_wordcloud = undefined; | |
}); | |
})(window, document); |
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