coderbear's log

Q1. 아래의 이미지처럼 html 페이지를 만드시오.

<!DOCTYPE html>
<html>

<head>
    <style>
        .dropdown {
            position: relative; // 부모 포지션 relative이면
            display: inline-block;
        }

        .dropdown-content {
            display: none; // 핵심내용
            position: absolute; // 자식 포지션은 absolute!
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
            padding: 12px 16px;
            z-index: 1;
        }

        .dropdown:hover .dropdown-content { // 후손인 dropdown-content의 display 성질을 block으로 바꿔줌
            display: block;
        }

    </style>
</head>

<body>

    <h2>Hoverable Dropdown</h2>
    <p>Move the mouse over the text below to open the dropdown content.</p>

    <div class="dropdown">
        <span>Mouse over me</span>
        <div class="dropdown-content">
            <p>Hello World!</p>
        </div>
    </div>

</body>

</html>

Q2. 아래의 이미지처럼 html 페이지를 만드시오.

<!DOCTYPE html>
<html>

<head>
    <style>
        .dropbtn {
            background-color: #4CAF50;
            color: white;
            padding: 16px;
            font-size: 16px;
            border: none;
            cursor: pointer;
        }

        .dropdown {
            position: relative;
            display: inline-block;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
            z-index: 1;
        }

        .dropdown-content a {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }

        .dropdown-content a:hover {
            background-color: #f1f1f1
        }

        .dropdown:hover .dropdown-content {
            display: block;
        }

        .dropdown:hover .dropbtn {
            background-color: #3e8e41;
        }

    </style>
</head>

<body>

    <h2>Dropdown Menu</h2>
    <p>Move the mouse over the button to open the dropdown menu.</p>

    <div class="dropdown">
        <button class="dropbtn">Dropdown</button>
        <div class="dropdown-content">
            <a href="#">Link 1</a>
            <a href="#">Link 2</a>
            <a href="#">Link 3</a>
        </div>
    </div>

    <p><strong>Note:</strong> We use href="#" for test links. In a real web site this would be URLs.</p>

</body>

</html>

Q3. 아래의 이미지처럼 html 페이지를 만드시오.

<!DOCTYPE html>
<html>
<head>
    <style>
        .dropbtn {
            background-color: #4CAF50;
            color: white;
            padding: 16px;
            font-size: 16px;
            border: none;
            cursor: pointer;
        }

        .dropdown {
            position: relative;
            display: inline-block;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            right: 0; // right 일 때
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
            z-index: 1;
        }

        .dropdown-content a {
            color: black;
            padding: 12px 16px;
            text-decoration: none;
            display: block;
        }

        .dropdown-content a:hover {
            background-color: #f1f1f1;
        }

        .dropdown:hover .dropdown-content {
            display: block;
        }

        .dropdown:hover .dropbtn {
            background-color: #3e8e41;
        }
    </style>
</head>

<body>

    <h2>Aligned Dropdown Content</h2>
    <p>Determine whether the dropdown content should go from left to right or right to left with the left and right properties.</p>

    <div class="dropdown" style="float:left;">
        <button class="dropbtn">Left</button>
        <div class="dropdown-content" style="left:0;"> // left 일 때
            <a href="#">Link 1</a>
            <a href="#">Link 2</a>
            <a href="#">Link 3</a>
        </div>
    </div>

    <div class="dropdown" style="float:right;">
        <button class="dropbtn">Right</button>
        <div class="dropdown-content">
            <a href="#">Link 1</a>
            <a href="#">Link 2</a>
            <a href="#">Link 3</a>
        </div>
    </div>
</body>
</html>

Q4. 아래의 이미지처럼 html 페이지를 만드시오.

<!DOCTYPE html>
<html>

<head>
    <style>
        .dropdown {
            position: relative;
            display: inline-block;
        }

        .dropdown-content {
            display: none;
            position: absolute;
            background-color: #f9f9f9;
            min-width: 160px;
            box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
            z-index: 1;
        }

        .dropdown:hover .dropdown-content {
            display: block;
        }

        .desc {
            padding: 15px;
            text-align: center;
        }

    </style>
</head>

<body>

    <h2>Dropdown Image</h2>
    <p>Move the mouse over the image below to open the dropdown content.</p>

    <div class="dropdown">
        <img src="img_5terre.jpg" alt="Cinque Terre" width="100" height="50">
        <div class="dropdown-content">
            <img src="img_5terre.jpg" alt="Cinque Terre" width="300" height="200">
            <div class="desc">Beautiful Cinque Terre</div>
        </div>
    </div>

</body>

</html>

Q5. 아래의 이미지처럼 html 페이지를 만드시오.

<!DOCTYPE html>
<html>
<head>
<style>
ul {
  list-style-type: none;
  margin: 0;
  padding: 0;
  overflow: hidden;
  background-color: #333;
}

li {
  float: left;
}

li a, .dropbtn { // 선택자 2개를 ,를 통해 한 번에 적용하는 것
  display: inline-block;
  color: white;
  text-align: center;
  padding: 14px 16px; // 위아래, 좌우
  text-decoration: none; // 링크 밑줄 삭제하는 것
}

li a:hover, .dropdown:hover .dropbtn { 
  background-color: red;
}

li.dropdown {
  display: inline-block;
}

.dropdown-content {
  display: none; // 처음에 안보여야 하기 때문에
  position: absolute;
  background-color: #f9f9f9;
  min-width: 160px;
  box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
  z-index: 1;
}

.dropdown-content a {
  color: black;
  padding: 12px 16px;
  text-decoration: none;
  display: block;
  text-align: left;
}

.dropdown-content a:hover {background-color: #f1f1f1;} 

.dropdown:hover .dropdown-content {
  display: block;
}
</style>
</head>
<body>

<ul>
  <li><a href="#home">Home</a></li>
  <li><a href="#news">News</a></li>
  <li class="dropdown">
    <a href="javascript:void(0)" class="dropbtn">Dropdown</a>
    <div class="dropdown-content">
      <a href="#">Link 1</a>
      <a href="#">Link 2</a>
      <a href="#">Link 3</a>
    </div>
  </li>
</ul>

<h3>Dropdown Menu inside a Navigation Bar</h3>
<p>Hover over the "Dropdown" link to see the dropdown menu.</p>

</body>
</html>

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