回答編集履歴
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ツイキ
test
CHANGED
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@@ -9,3 +9,67 @@
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じゃだめなんですか？
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[MDN](https://developer.mozilla.org/ja/docs/Web/HTML/Element/Input/date)
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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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```HTML
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<select onchange=date(this)>
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</select>
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<select>
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</select>
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```
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```JS
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for(i=0;i<10;i++){
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var year = 2019 + i;
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for(j=1;j<=12;j++){
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document.getElementsByTagName('select')[0].innerHTML += '<option class=' + (j - 1) + '>' + year + '年' + j + '月</option>'
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}
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}
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var dates = [31,28,31,30,31,30,31,31,30,31,30,31];
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function date(obj){
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document.getElementsByTagName('select')[1].innerHTML = '';
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for(j=1;j<=dates[obj.options[obj.selectedIndex].className];j++){
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document.getElementsByTagName('select')[1].innerHTML += '<option>' + j + '日</option>';
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}
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}
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for(j=1;j<=dates[0];j++){
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document.getElementsByTagName('select')[1].innerHTML += '<option>' + j + '日</option>';
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}
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```
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[サンプル](https://codepen.io/asuchi0819/pen/LYYMVYY?editors=1010)
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