回答編集履歴
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chousei
answer
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@@ -1,1 +1,85 @@
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DOMContentLoaded処理が抜けているので、jQueryオブジェクトがつかめてないのでは？
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DOMContentLoaded処理が抜けているので、jQueryオブジェクトがつかめてないのでは？
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# sample
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```javascript
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<style>
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* {
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margin: 0;
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padding: 0;
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}
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.wrapper {
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width: 350px;
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}
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.button_area {
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background-color: #000;
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height: 100px;
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display: flex;
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justify-content: center;
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}
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.button_area div {
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align-self: center;
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}
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.button_area div + div {
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margin-left: 20px;
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}
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.image_wrapper {
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display: flex;
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height: 200px;
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}
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.none {
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display: none;
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}
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</style>
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<script>
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class Photoview {
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constructor(){
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document.addEventListener("DOMContentLoaded",()=>{
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this.el = document.querySelector('.image_wrapper img');
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this.images = [
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Object.assign(new Image(),{src:'https://fakeimg.pl/350x200/ff0000/?text=1'}),
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Object.assign(new Image(),{src:'https://fakeimg.pl/350x200/ff0000/000?text=2'}),
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Object.assign(new Image(),{src:'https://fakeimg.pl/350x200/ff0000,128/000,255?text=3'}),
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];
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this.index = 0;
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this.nextBtn = document.querySelector('.next');
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this.prevBtn = document.querySelector('.prev');
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this.handleEvent();
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this.displayImg();
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});
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}
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handleEvent() {
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this.nextBtn.addEventListener("click",()=>{
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this.next();
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});
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this.prevBtn.addEventListener("click",()=>{
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this.prev();
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});
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}
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next() {
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this.index++;
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if(this.index>this.images.length-1) this.index=0;
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this.displayImg();
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}
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prev() {
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this.index--;
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if(this.index<0) this.index=this.images.length-1;
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this.displayImg();
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}
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displayImg() {
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this.el.src= this.images[ this.index ].src;
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}
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}
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const Photoview_ins = new Photoview;
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</script>
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<div class="wrapper">
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<figure class="image_wrapper">
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<img src="https://fakeimg.pl/350x200/ff0000/?text=1">
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</figure>
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<div class="button_area">
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<div class="prev"><img src="https://fakeimg.pl/50x50/?text=prev"></div>
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<div class="next"><img src="https://fakeimg.pl/50x50/?text=next"></div>
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</div>
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</div>
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```
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