# Event Listner 연습문제

✨ 실습1. test001.html 을 만들고 마우스를 올렸을 때 리스트가 보이고 마우스가 벗어나면 숨기는 이벤트리스너를 만들어보자.



{% code title="test001.html" %}
```html
<!doctype html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap demo</title>

    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-4bw+/aepP/YC94hEpVNVgiZdgIC5+VKNBQNGCHeKRQN+PtmoHDEXuppvnDJzQIu9" crossorigin="anonymous">

    <link rel="stylesheet" href="main.css">
    <script src="https://code.jquery.com/jquery-3.7.0.min.js" integrity="sha256-2Pmvv0kuTBOenSvLm6bvfBSSHrUJ+3A7x6P5Ebd07/g=" crossorigin="anonymous"></script>

</head>
<body>


<nav class="navbar ">
    <div class="container-fluid">
        <a class="navbar-brand" href="#">Offcanvas navbar</a>
        <button class="navbar-toggler" type="button">
            <span class="navbar-toggler-icon"></span>
        </button>
    </div>
</nav>

<ul class="list-group" id="list1">
    <li class="list-group-item">An item</li>
    <li class="list-group-item">A second item</li>
    <li class="list-group-item">A third item</li>
    <li class="list-group-item">A fourth item</li>
    <li class="list-group-item">And a fifth one</li>
</ul>



<script>
    

</script>




<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-HwwvtgBNo3bZJJLYd8oVXjrBZt8cqVSpeBNS5n7C8IVInixGAoxmnlMuBnhbgrkm" crossorigin="anonymous"></script>
</body>
</html>
```
{% endcode %}



✨ 실습2. 위 문제가 너무 쉬운 사람만 마우스가 올라가고 해당 메뉴바의 자식에 마우스가 올라갔을때는 안사라지고 완전히 바깥으로 같을때에만 사라지게 해보자&#x20;

```html
<div id="wrap">
    <div id="header">
        <h1>
            <a href="#">logo</a>
        </h1>
        <ul id="gnb" class="">
            <li>
                <a href="#">menu1</a>
                <div class="snb">
                    <ul>
                        <li>menu1-1</li>
                        <li>menu1-2</li>
                        <li>menu1-3</li>
                        <li>menu1-4</li>
                    </ul>
                </div>
            </li>
            <li>
                <a href="#">menu2</a>
                <div class="snb">
                    <ul>
                        <li>menu1-1</li>
                        <li>menu1-2</li>
                        <li>menu1-3</li>
                        <li>menu1-4</li>
                    </ul>
                </div>
            </li>
            <li>
                <a href="#">menu3</a>
                <div class="snb">
                    <ul>
                        <li>menu1-1</li>
                        <li>menu1-2</li>
                        <li>menu1-3</li>
                        <li>menu1-4</li>
                    </ul>
                </div>
            </li>
            <li>
                <a href="#">menu4</a>
                <div class="snb">
                    <ul>
                        <li>menu1-1</li>
                        <li>menu1-2</li>
                        <li>menu1-3</li>
                        <li>menu1-4</li>
                    </ul>
                </div>
            </li>
        </ul>
        <ul id="util">
            <li><a href="#">login</a></li>
            <li><a href="#">join</a></li>
        </ul>
    </div>
</div>
```

```css
*{
    margin: 0;
    padding: 0;
}

ul,li{
    list-style: none;
}

a{
    text-decoration: none;
}

#wrap{
    width: 100%;
}

#header{
    position:fixed;
    width: 100%;
    left: 0;
    top: 0;
    padding: 0 30px;
    box-sizing: border-box;
    border-bottom: 1px solid #e1e1e1;
    display:flex;
    justify-content: space-between;
}

#header h1{
    padding: 20px 0;
}

#header > #gnb {
    width: 1200px;
    display: flex;
    justify-content: space-evenly;
    align-items: center;
}

#header > #gnb::before {
    content: "";
    width: 100%;
    position:absolute;
    top: 85px;
    left: 0;
    height: 180px;
    background: #fff;
    border-bottom: 1px solid #e1e1e1;
    box-shadow: 0px 10px 10px 0px rgba(48,49,51,6%);
    display: block;
}

#header > #gnb::before {
    display: none;
}

#header > #gnb.on::before {
    display: block;
}

#header > #gnb > li .snb {
    position:absolute;
    top: 100px;
    display:none;
}

#header > #gnb.on > li .snb {
    display: block;
}

#header > #gnb > li > .snb > ul > li + li {
    margin-top:20px;
}
```

스크립트 작성

```html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="https://code.jquery.com/jquery-3.7.0.min.js" integrity="sha256-2Pmvv0kuTBOenSvLm6bvfBSSHrUJ+3A7x6P5Ebd07/g=" crossorigin="anonymous"></script>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@3.3.7/dist/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">


</head>
<body>
<div class="container">
    <div class="navbar navbar-default" role="navigation">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-ex1-collapse">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">Brand</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-ex1-collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Link</a></li>
                <li><a href="#">Link</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Another action</a></li>
                        <li><a href="#">Something else here</a></li>
                        <li><a href="#">Separated link</a></li>
                        <li><a href="#">One more separated link</a></li>
                    </ul>
                </li>
            </ul>

            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">Link</a></li>
                <li class="dropdown">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Action</a></li>
                        <li><a href="#">Another action</a></li>
                        <li><a href="#">Something else here</a></li>
                        <li><a href="#">Separated link</a></li>
                    </ul>
                </li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div>
</div>

<script>
    $('.navbar .dropdown').hover(function() {
        $(this).find('.dropdown-menu').first().stop(true, true).slideDown(150);
    }, function() {
        $(this).find('.dropdown-menu').first().stop(true, true).slideUp(105)
    });
</script>
</body>
</html>
```

{% embed url="https://codepen.io/" %}

이 사이트에서 간단한 코드들 작성하고 확인하기 쉽다.&#x20;
