質問編集履歴
1
書式の改善
title
CHANGED
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File without changes
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body
CHANGED
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@@ -70,4 +70,82 @@
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70
70
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</script>
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71
71
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</body>
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72
72
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</html>
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73
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+
```
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74
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+
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75
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+
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76
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+
【追記】
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77
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+
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78
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+
```HTML
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79
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+
comment = document.getElementById(id_text.value);
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80
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+
↓
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81
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+
comment = document.getElementById(id_text).value;
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82
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+
```
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83
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+
上記の変更を加えてもTypeError: Cannot read property 'value' of null
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84
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+
と表示されてしまいます。
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85
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+
なぜnullになるのでしょうか？
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86
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+
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87
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+
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88
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```HTML
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89
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<!DOCTYPE html>
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90
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<html lang="ja">
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91
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<head>
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92
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<meta charset="UTF-8">
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93
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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94
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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95
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<title>ToDoリスト</title>
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96
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<link rel="stylesheet" href="css/styles.css">
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97
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+
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98
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</head>
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99
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<body>
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100
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<h1>ToDoリスト</h1>
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101
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+
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102
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<div class="radiobutton">
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103
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<input type="radio" id="button-1" name="radio1" value="1" checked />
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104
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<label for="button-1">すべて</label>
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105
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<input type="radio" id="button-2" name="radio1" value="2" />
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106
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<label for="button-2">完了中</label>
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107
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<input type="radio" id="button-3" name="radio1" value="3" />
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108
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<label for="button-3">作業中</label>
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109
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+
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110
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+
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111
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<h3 id="id_h3">ID コメント 状態</h3>
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112
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<div id="todo"></div>
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113
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<h2>新規タスクの増加</h2>
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114
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+
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115
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<p id = id_p>
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116
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<input type="text" id="id_text" value="">
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117
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<button id="btn" type="btn" class="button"> 追加</button>
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118
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</p>
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119
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</div>
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120
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+
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121
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<script>
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122
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let id = 0;
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123
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const btn = document.getElementById('btn');
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124
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btn.addEventListener('click', () => {
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125
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126
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const idEl = document.createElement("span");
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127
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idEl.textContent = id;
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128
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const comment = document.getElementById(id_text).value;
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129
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const commentEl = document.createElement("span");
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130
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commentEl.textContent = (comment);
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131
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+
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132
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const btn1El = document.createElement("button");
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133
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btn1El.textContent = "作業中";
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134
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const btn2El = document.createElement("button");
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135
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btn2El.textContent = "削除";
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136
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+
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137
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const divEl = document.createElement("div");
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138
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divEl.appendChild(idEl);
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139
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divEl.appendChild(commentEl);
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140
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divEl.appendChild(btn1El);
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141
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divEl.appendChild(btn2El);
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142
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+
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143
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const todoEl = document.getElementById("todo");
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144
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todoEl.appendChild(divEl);
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145
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id++;
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146
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}, false);
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147
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+
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148
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</script>
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149
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</body>
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150
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+
</html>
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73
151
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```
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