[jQuery]attr, each, 이를 활용한 Dot Slide

*attr(attribute)

=> 태그의 속성을 추가 또는 변경할 수 있음

body

    <div class="box" data-menu="ramen">라면</div>
    <div class="box_1">보쌈</div>

=> data-xx=""는 선택자로 사용된다.

style

        .box[data-menu="ramen"]{
            font-size: 50px;
            color: gold;
        }

        .box{
            font-style: italic;
        }

        .box_1{
            width: 300px;
            height: 300px;
            background-color: lightgreen;
            margin-top: 30px;
        }

        .text{
            font-size: 100px;
            color: lightsteelblue;
        }

script

        $(document).ready(function(){

            $('.box').css({
                width: 300,
                height: 300,
                backgroundColor: "hotpink"
            });

            // $('.box_1').attr("")    //이런 형식으로도 사용가능
            // $('.box_1').attr({
            //     class: "text"
            // })
            $('.box').click(function(){
                $('.box_1').attr({
                class: "box text"
                })
            });
            
        });

*each

$('선택자').each(function(매개변수){});

=> each의 기본 모양

each(function(매개변수){})

=> 반복문 역할을 함
=> 매개변수를 반드시 지정해줘야 함
=> 매개변수는 index number 값을 얻어옴

script

        $(document).ready(function(){

            $('li').each(function(i){
                $(this).attr({
                    "data-num": i
                });
            });
            
        });

each와 attr 연습(dot slide)

body

    <div class="wrap">

        <div class="img_wrap">
            <div class="img"></div>
            <div class="img"></div>
            <div class="img"></div>
            <div class="img"></div>
        </div>

        <div class="dot_wrap">
            <div class="dot"></div>
            <div class="dot"></div>
            <div class="dot"></div>
            <div class="dot"></div>
        </div>

    </div>

style.css

*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

.wrap{
    width: 600px;
    height: 400px;
    border: 3px solid black;
    position: relative;
    margin: 150px auto;
    overflow: hidden;
}

.img_wrap{
    width: 2400px;
    height: 100%;
    background-color: rosybrown;
    display: flex;
    position: absolute;
    top: 0;
    left: 0;
    transition: 0.5s;
}

.img{
    width: 600px;
    height: 100%;
}

.img:nth-child(1){
    background: url(https://static.vecteezy.com/system/resources/previews/002/037/924/non_2x/abstract-blue-background-with-beautiful-fluid-shapes-free-vector.jpg) no-repeat center / cover;
}

.img:nth-child(2){
    background: url(https://img.freepik.com/premium-vector/modern-vector-graphic-abstract-backgorund_600800-1752.jpg) no-repeat center / cover;
}

.img:nth-child(3){
    background: url(https://static.vecteezy.com/system/resources/thumbnails/004/968/002/small/cute-abstract-modern-background-free-vector.jpg) no-repeat center / cover;
}

.img:nth-child(4){
    background: url(https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcT6FmPfEi3_Mp2iMcBcvyAF-KcOSXhgtlNirxHelIKDgs0EzGtk5VHBh1dqNiMevyy06Xs&usqp=CAU) no-repeat center / cover;
}

.dot_wrap{
    width: 30%;
    height: 10%;
    position: absolute;
    bottom: 15px;
    left: calc(50% - 15%);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.dot{
    border-radius: 50%;
    width: 30px;
    height: 30px;
    border: 3px solid gray;
    background-color: white;
    cursor: pointer;
}

main.js

$(document).ready(function(){

    $('.dot').each(function(i){
        $(this).attr({
            "data-index": i
        });
    }).click(function(){
        var num = $(this).attr("data-index");
        var aniMove = $('.img_wrap').stop().animate({ left: -600 * num });
        
        if(num){
            aniMove;
        }

    });

});