質問編集履歴
1
書式の改善
test
CHANGED
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File without changes
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test
CHANGED
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@@ -143,3 +143,159 @@
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143
143
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</html>
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144
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145
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```
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146
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147
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148
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149
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150
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151
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【追記】
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152
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153
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154
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155
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```HTML
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156
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157
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comment = document.getElementById(id_text.value);
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158
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159
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↓
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160
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161
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comment = document.getElementById(id_text).value;
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162
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163
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```
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164
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165
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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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166
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167
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と表示されてしまいます。
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168
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169
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なぜnullになるのでしょうか？
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170
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171
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172
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173
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174
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175
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```HTML
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176
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177
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<!DOCTYPE html>
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178
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179
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<html lang="ja">
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180
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181
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<head>
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182
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183
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<meta charset="UTF-8">
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184
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185
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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186
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187
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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188
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189
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<title>ToDoリスト</title>
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190
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191
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<link rel="stylesheet" href="css/styles.css">
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192
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193
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194
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195
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</head>
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196
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197
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<body>
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198
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199
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<h1>ToDoリスト</h1>
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200
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201
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202
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203
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<div class="radiobutton">
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204
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205
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<input type="radio" id="button-1" name="radio1" value="1" checked />
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206
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<label for="button-1">すべて</label>
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<input type="radio" id="button-2" name="radio1" value="2" />
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210
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<label for="button-2">完了中</label>
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212
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<input type="radio" id="button-3" name="radio1" value="3" />
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214
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215
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<label for="button-3">作業中</label>
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<h3 id="id_h3">ID コメント 状態</h3>
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222
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<div id="todo"></div>
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224
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<h2>新規タスクの増加</h2>
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226
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227
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228
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<p id = id_p>
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<input type="text" id="id_text" value="">
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<button id="btn" type="btn" class="button"> 追加</button>
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234
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</p>
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236
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</div>
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239
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240
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241
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<script>
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242
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243
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let id = 0;
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244
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const btn = document.getElementById('btn');
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btn.addEventListener('click', () => {
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250
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const idEl = document.createElement("span");
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252
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idEl.textContent = id;
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254
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const comment = document.getElementById(id_text).value;
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256
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257
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const commentEl = document.createElement("span");
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258
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commentEl.textContent = (comment);
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261
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263
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const btn1El = document.createElement("button");
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264
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btn1El.textContent = "作業中";
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const btn2El = document.createElement("button");
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btn2El.textContent = "削除";
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270
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271
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272
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const divEl = document.createElement("div");
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divEl.appendChild(idEl);
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divEl.appendChild(commentEl);
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divEl.appendChild(btn1El);
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divEl.appendChild(btn2El);
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283
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const todoEl = document.getElementById("todo");
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todoEl.appendChild(divEl);
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id++;
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290
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}, false);
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</script>
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296
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</body>
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298
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299
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</html>
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300
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301
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+
```
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