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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<form id="my-form" method="post">
​
    <select name="first-list" multiple="multiple" size="10">
        <option value="0"></option>
        <option value="1">first</option>
        <option value="2">second</option>
        <option value="3">third</option>
        <option value="4">fourth</option>
        <option value="5">fifth</option>      
    </select>
​
    <select name="second-list" multiple="multiple" size="10">
        <option value="0"></option>
        <option value="6">first</option>
        <option value="7">second</option>
        <option value="8">third</option>
        <option value="9">fourth</option>
        <option value="10">fifth</option>      
    </select>
​
    <input type="button" name="button" id="button" value="submit" />
​
</form>
</body>
</html>
 
document.getElementById("button").onclick = function(){
var lists = document.getElementsByTagName('SELECT'), chosen = [], temp = [], list = {}, i, j; 
  for(i = 0; i < lists.length; i++) {
    list = lists[i];
    temp = [];
    for(j = 0; j < list.length; j++) {
      if(list[j].selected) temp.push(list[j].value);  
    }
    chosen.push(temp);
  }
  console.log(JSON.stringify(chosen));
};
​
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anonymouspro
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