回答編集履歴
2
訂正
test
CHANGED
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@@ -46,7 +46,9 @@
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46
46
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// 1. select.subbox の操作で値が変わると発火するイベント
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48
48
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49
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+
//document.getElementById("cate").addEventListener("cange", function(event){
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50
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49
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-
document.getElementById("cate").addEventListener("cange", function(event){
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51
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document.getElementById("cate").addEventListener("change", function(event){
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var elm = event.target; // select#id になる。
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1
追記
test
CHANGED
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@@ -32,7 +32,7 @@
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32
32
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33
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var dispSubBox = function(subId) {
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35
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-
[...document.querySelectorAll(".subbox2")].forEach(elm
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35
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[...document.querySelectorAll(".subbox2")].forEach(function(elm){
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elm.style.display = elm.id===subId ? "inline": "none"
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@@ -68,6 +68,8 @@
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MDN
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70
70
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71
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* [条件（三項）演算](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Operators/Conditional_Operator)
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72
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+
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* [Event.target](https://developer.mozilla.org/ja/docs/Web/API/Event/target)
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72
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* [DOcument.querySelectorAll()](https://developer.mozilla.org/ja/docs/Web/API/Document/querySelectorAll)
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