回答編集履歴
1
ツイキ
answer
CHANGED
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@@ -3,4 +3,36 @@
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3
3
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<input type=date>
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4
4
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```
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5
5
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じゃだめなんですか？
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6
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-
[MDN](https://developer.mozilla.org/ja/docs/Web/HTML/Element/Input/date)
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6
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+
[MDN](https://developer.mozilla.org/ja/docs/Web/HTML/Element/Input/date)
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7
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+
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8
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+
要望通りのものだと以下のように書けばできる。
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9
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```HTML
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10
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<select onchange=date(this)>
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11
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+
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12
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</select>
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13
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<select>
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14
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+
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15
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</select>
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16
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```
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17
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```JS
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18
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for(i=0;i<10;i++){
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19
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var year = 2019 + i;
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20
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for(j=1;j<=12;j++){
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21
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document.getElementsByTagName('select')[0].innerHTML += '<option class=' + (j - 1) + '>' + year + '年' + j + '月</option>'
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22
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}
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23
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}
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24
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+
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25
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var dates = [31,28,31,30,31,30,31,31,30,31,30,31];
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26
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+
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27
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function date(obj){
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28
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document.getElementsByTagName('select')[1].innerHTML = '';
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29
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for(j=1;j<=dates[obj.options[obj.selectedIndex].className];j++){
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30
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document.getElementsByTagName('select')[1].innerHTML += '<option>' + j + '日</option>';
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31
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}
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32
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}
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33
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+
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34
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for(j=1;j<=dates[0];j++){
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35
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document.getElementsByTagName('select')[1].innerHTML += '<option>' + j + '日</option>';
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36
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}
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37
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```
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38
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[サンプル](https://codepen.io/asuchi0819/pen/LYYMVYY?editors=1010)
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