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checkedPre-imposta su 'true' il valore di un elemento input checkbox o radio
methodDetermina il metodo di invio dei dati di un form al server
<pre>Indica una parte di testo preformattato
preloadL'attributo preload indica se precaricare un contenuto audio e video con il documento HTML
formnovalidateImpedisce la convalida di un singolo elemento input
maxImposta il valore numerico o temporale massimo per un elemento input

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<style>
  textarea {
    height:300px;
    width: 100%;
  }
  #half {
    display:flex;
    flex-direction:row;
    flex-wrap: wrap;
    grid-gap:3px
  }
  .rigel, .halfrigel {
    font-size:18pt;
    background-color:#EEE;
    padding:10px 20px;
    margin: 5px 0px;
  }
  .halfrigel {
    flex:1 0 40%;
  }

  .conti {
    float: right;
    padding: 0px 10px;
    background-color:white;
    border-radius: 10px;

  }
</style>

<script type="text/javascript">
  function convTempo(m){
    var e = m < 0 ? "-" : "";
    var min = Math.floor(Math.abs(m));
    var sec = Math.floor((Math.abs(m) * 60) % 60);
    return e + (min < 10 ? "0" : "") + min + ":" + (sec < 10 ? "0" : "") + sec;
  }
  const paroleAlMinL = 220;   
  const paroleAlMinP = 135;   
  const paroleAlMinS = 60;   
  const PpP = 600;   
  const PpB = 280;   
  function count()
  {

    var txt =document.getElementById("text").value;
    nospace=txt.replace(/[\s,]+/g, "");
    document.getElementById("nospace").innerHTML=""+nospace.length;

    space=txt.replace(/\n/g, "");
    document.getElementById("space").innerHTML=""+space.length;

    word = txt.replace(/[&\/\\#,+()$~%.'":*?<>{}]/g,"");
    word = word.replace(/[\s,]+/g, " ");
    word = word.split(" ").filter(function(n) { return n != "" }).length;
    document.getElementById("word").innerHTML =  word;

    var tempoLettura = word/paroleAlMinL;  
    document.getElementById("readingTime").innerHTML =  convTempo(tempoLettura);

    var tempoScrittura = word/paroleAlMinS;  
    document.getElementById("writingTime").innerHTML =  convTempo(tempoScrittura);  

    var tempoParlata = word/paroleAlMinP;  
    document.getElementById("speakingTime").innerHTML =  convTempo(tempoParlata);

    string = txt.toLowerCase();
    string = string.split(/\s+/).join(' ');
    var cleanString = string.replace(/[\.,-\/#!$%\^&\*;:{}=\-_`~()]/g,""),
        wordsf = cleanString.split(' '),
        frequencies = {},
        wordf, frequency, i;

    for( i=0; i<wordsf.length; i++ ) {
      if (wordsf[i].length >3  && wordsf[i].length < 25 ){
        wordf = wordsf[i];
        frequencies[wordf] = frequencies[wordf] || 0;
        frequencies[wordf]++;
      }
    }
    wordsf = Object.keys( frequencies );

    var frq = wordsf.sort(function (a,b) {
      let cc =  frequencies[b] - frequencies[a];   
      return  cc;
    } ).slice(0,5).toString();
    document.getElementById("mostRepeted").innerHTML = frq.replaceAll(",", ", ")


    const textEncoder = new TextEncoder();
    var en = textEncoder.encode(txt).length;
    var byte, kilo, mega;
    if (en < 1000){
      byte = en + " byte";   
    } 
    else if(en > 1000 && en < 1000000){ 
      kilo = Math.round((en) * 1) / 1000 ;     byte = kilo + " kB";   
    }   
    else if(en > 1000000 && en < 1000000000){
      kilo = Math.round((en) * 1) / 1000 ;
      mega = Math.round((kilo) * 1) / 1000 ;
      byte = mega  + " MB";
    }
    let pages = word/PpP;
    let books = word/PpB;
    pages = Math.ceil(pages);
    books = Math.ceil(books);
    document.getElementById("sizeTxt").innerHTML = byte;
    document.getElementById("npages").innerHTML = pages.toFixed(0);
    document.getElementById("nbook").innerHTML = books.toFixed(0);
	
    if (word.length == 0){ 
      document.getElementById("word").innerHTML = "0";
      document.getElementById("mostRepeted").innerHTML= " - ";
      document.getElementById("npages").innerHTML= " - ";
    }
  }

</script>

<div id="wrapper">

  <textarea id="text" onpaste="count();" placeholder="Inserisci qui il testo"></textarea>
  <p class="rigel">Numero di <b>parole</b>: <span id="word" class="conti">0</span></p>
  <p class="rigel">Numero <b>caratteri</b> (senza spazi): <span id="nospace" class="conti">0</span></p>
  <p class="rigel">Numero di caratteri (con spazi): <span id="space" class="conti">0</span></p>
  <div id="half">
    <p class="halfrigel">Tempo di lettura: <span id="readingTime" class="conti">00:00</span></p>
    <p class="halfrigel ">Tempo di scrittura: <span id="writingTime" class="conti">00:00</span></p>
    <p class="halfrigel ">Tempo nel parlato: <span id="speakingTime" class="conti">00:00</span></p>  
    <p class="halfrigel ">Dimensioni (kB): <span id="sizeTxt" class="conti">0 b</span></p>  
    <p class="halfrigel ">Pagine (A4): <span id="npages" class="conti">-</span></p>  
    <p class="halfrigel ">Pagine (A5/libro): <span id="nbook" class="conti">-</span></p>  
  </div>

  <p class="rigel">Parole più usate:<span class="conti" id="mostRepeted" style="float:unset; font-size:16pt;">-</span> </p>
</div>


<script>
  var ltimer; 
  var interval = 1000;

  document.getElementById('text').addEventListener("keyup", function(){
    clearTimeout(ltimer);
    ltimer = setTimeout(count, interval); 
  })
  
  function countLines() {
   var el = document.getElementById('text');
   var divHeight = el.offsetHeight
   var lineHeight = parseInt(el.style.lineHeight);
   var lines = divHeight / lineHeight;
   alert("Lines: " + lines);
}
</script>

*{ }