回答編集履歴
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chousei
test
CHANGED
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@@ -1,3 +1,79 @@
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例示のhtmlの中に#titleや.submit-btnのセレクタでヒットするちゅうhtml要素がないため
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nullにaddEventListenerしようとしているのだと思います
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# sample
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```javascript
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<script>
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window.addEventListener('DOMContentLoaded', ()=>{
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const contents=document.querySelector('#contents');
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const addContent=()=>{
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var div = Object.assign(document.createElement('div'),{
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className:'content',
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innerHTML:'<form><input class="mini-title" name="title" type="text" size="50" placeholder="タイトル"><br><textarea maxlength="300" placeholder="内容" class="mini-content"></textarea><br><span class="sub-title">※テキストが入ります。テキストが入ります。テキストが入りま</span><br><div class="submit-area"><br><input class="submit-btn" type="button" value="投稿する"></div></div></form>',
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});
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contents.appendChild(div);
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};
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const showContent_item=()=>{
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var div = Object.assign(document.createElement('div'),{
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className: 'content_item',
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innerHTML:'<h2 class="item-title">test</h2>',
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});
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contents.appendChild(div);
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};
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const head_title = document.querySelector('#title');
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document.querySelector('.add-content-btn').addEventListener('click',e=>{
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addContent();
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const submit_btn = document.querySelector('.submit-btn');
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submit_btn.addEventListener('click', function() {
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showContent_item();
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});
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e.target.style.display = 'none';
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});
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});
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</script>
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<div id="main">
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<div id="contents">
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</div>
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<i class="fas fa-plus add-content-btn fa-3x">x</i>
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</div>
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```
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