[JavaScript] 자동 이미지 슬라이더 만들기

 

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1. html 파일 작성

2. css 파일 작성

3. javascript 파일 작성

4. 완성 화면

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1. html 파일 작성

 - 간단하게 이미지 부분과 밑에 이동할 때마다 표시해 줄 점을 만들어줌

<h2>이미지 슬라이드 8/29</h2>

//이미지 삽입
<div class="slideshow-container">
    <img class="mySlides fade" src="img/1.png" alt="">
    <img class="mySlides fade" src="img/2.png" alt="">
    <img class="mySlides fade" src="img/3.png" alt="">
    <img class="mySlides fade" src="img/4.png" alt="">
    <img class="mySlides fade" src="img/5.png" alt="">
    <img class="mySlides fade" src="img/6.png" alt="">
    <img class="mySlides fade" src="img/7.png" alt="">
    <img class="mySlides fade" src="img/8.png" alt="">
    <img class="mySlides fade" src="img/9.png" alt="">
    <img class="mySlides fade" src="img/10.png" alt="">
    <img class="mySlides fade" src="img/11.png" alt="">
    <img class="mySlides fade" src="img/12.png" alt="">
</div>

//이미지의 갯수 만큼 만들어줘야 함
<div style="text-align:center">
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
    <span class="dot"></span>
</div>

 

 

 

2. css 파일 작성

 - 부트스트랩을 적용했다면 fade 부분이 정상 작동하지 않을 수 있음

* {box-sizing: border-box}
body {font-family: Verdana, sans-serif; margin:0}
.mySlides {display: none}
.slideshow-container img {vertical-align: middle; width: 100%}

/* Slideshow container */
.slideshow-container {
    max-width: 1000px;
    position: relative;
    margin: auto;
    width: 70%;
}

/* Next & previous buttons */
.prev, .next {
    cursor: pointer;
    position: absolute;
    top: 50%;
    width: auto;
    padding: 16px;
    margin-top: -22px;
    color: white;
    font-weight: bold;
    font-size: 18px;
    transition: 0.6s ease;
    border-radius: 0 3px 3px 0;
    user-select: none;
}

/* Position the "next button" to the right */
.next {
    right: 0;
    border-radius: 3px 0 0 3px;
}

/* The dots/bullets/indicators */
.dot {
    cursor: pointer;
    height: 5px;
    width: 5px;
    margin: 0 2px;
    background-color: #bbb;
    border-radius: 50%;
    display: inline-block;
    transition: background-color 0.6s ease;
}

.active, .dot:hover {
    background-color: #717171;
}

/* Fading animation */
.fade {
    -webkit-animation-name: fade;
    -webkit-animation-duration: 1.5s;
    animation-name: fade;
    animation-duration: 1.5s;
}

@-webkit-keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

@keyframes fade {
    from {opacity: .4}
    to {opacity: 1}
}

/* On smaller screens, decrease dot size */
@media only screen and (max-width: 300px) {
    .dot {visibility: hidden}
}

 

 

 

3. javascript 코드 작성

<script>
    var slideIndex = 0;
    showSlides();

    function showSlides() {
        var i;
        var slides = document.getElementsByClassName("mySlides");
        var dots = document.getElementsByClassName("dot");
        for (i = 0; i < slides.length; i++) {
            slides[i].style.display = "none";
        }
        slideIndex++;
        if (slideIndex > slides.length) {slideIndex = 1}
        for (i = 0; i < dots.length; i++) {
            dots[i].className = dots[i].className.replace(" active", "");
        }
        slides[slideIndex-1].style.display = "block";
        dots[slideIndex-1].className += " active";
        setTimeout(showSlides, 2000); // Change image every 2 seconds
    }
</script>

 

 

 

 

4. 완성 화면