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HTML

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About the <head>

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!
Insecure Resource

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CSS

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CSS preprocessors help make authoring CSS easier. All of them offer things like variables and mixins to provide convenient abstractions.

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CSS Base

About CSS Base

It's a common practice to apply CSS to a page that styles elements such that they are consistent across all browsers. We offer two of the most popular choices: normalize.css and a reset. Or, choose Neither and nothing will be applied.

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JavaScript

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JavaScript preprocessors can help make authoring JavaScript easier and more convenient.

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Babel includes JSX processing.

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HTML 

              
                <table id="table-container">
  <thead>
    <tr>
      <th>入力項目</th>
      <th>x2</th>
      <th>x3</th>
      <th>済</th>
    </tr>
  </thead>
  <tbody>
    <tr class="id1">
      <td><input id="change-content" type="text"></td>
      <td><input type="text"></td>
      <td><input type="text"></td>
      <td><input type="checkbox"></td>
    </tr>
    <tr class="id2">
      <td><input id="change-content" type="text"></td>
      <td><input type="text"></td>
      <td><input type="text"></td>
      <td><input type="checkbox"></td>
    </tr>
    <tr class="id3">
      <td><input id="change-content" type="text"></td>
      <td><input type="text"></td>
      <td><input type="text"></td>
      <td><input type="checkbox"></td>
    </tr>
  </tbody>
</table>
!

CSS 

              
                #table-container {
  border: 1px solid;
}
#table-container td {
  text-align:center;
}
#table-container input {
  text-align:right;
}
!

JS 

              
                $("#table-container input[type=text]#change-content").change(function() {
  
  var className = $(this).closest("tr").attr("class");
  var num = $(this).val();
  try {
    tmpNum = parseFloat(num);
    
    // Nanかチェック
    if (isCheckNaN(tmpNum)) {
      $("tr."+className+"  input[type=checkbox]").prop("checked", false);
      $(this).val("");
      return;
    } else {
      num = tmpNum;
      $(this).val(num);
    }
  }
  catch (e) {
    return;
  }
  
  // 項目を変更した行のテキストボックスの値を変更する
  // 最初の行は変更対象外）(not利用)
  $("tr."+className+" input[type=text]").not(':first').each(function(i){
    switch (i) {
      case 0:
        $(this).val(num*2);
        break;
      case 1:
        $(this).val(num*3)
        break;
      default:
        break;
    }
  });
  
  // チェックボックスにチェックを付ける
  $("tr."+className+"  input[type=checkbox]").prop("checked", true);
});

// Nan === Nan -> false
// ↑の性質を利用する
function isCheckNaN(num) {
  return num !== num || typeof num !== "number";
}
!
999px

Console