Bootstrap 4 Popover

popover是bootstrap的一个属性，可以用来使任何网站看起来更有活力。弹出窗口通常用于显示任何元素的额外信息，并在鼠标指针点击该元素时显示。
data-toggle = “popover “属性用于创建popover，title=”popover-title “属性用于添加popover的标题，data-content=”popover-content “用于添加popover内容。
语法:

<element data-toggle="popover" title="popover-title" 
         data-content="popover-content">
    popover element
<element>

示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Popover</title>
    <meta charset="utf-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <br>
    <div class="container">
        <button style="color:green;" data-toggle="popover"
            title="popover-title" data-content="popover-content">
            GeeksforGeeks popover
        </button>
    </div>
    <script>
         $(document).ready(function () {$ ('[data-toggle="popover"]').popover();
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Popover

定位 popover： data-placement属性用于设置popover元素的定位。popover元素的位置可以设置为元素的顶部、底部、左侧或右侧。
示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Popover</title>
    <meta charset="utf-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <div class="container">
        <h1 style="color:green;">
            GeeksforGeeks
        </h1>
        <h2>Positioning popover</h2>
        <button data-toggle="popover" data-placement="top"
            title="Top-popover" data-content="Popover content">
            Top
        </button>
        <button data-toggle="popover" data-placement="bottom"
            title="Bottom-popover" data-content="Popover content">
            Bottom
        </button>
        <button data-toggle="popover" data-placement="left"
            title="Left-popover" data-content="Popover content">
            Left
        </button>
        <button data-toggle="popover" data-placement="right"
            title="Right-popover" data-content="Popover content">
            Right
        </button>
    </div>
    <script>
         $(document).ready(function () {$ ('[data-toggle="popover"]').popover();
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Popover

关闭弹出式窗口：默认情况下，当鼠标点击双击时，弹出式窗口元素被关闭。data-trigger=”focus “属性用于在鼠标点击弹出式元素之外时关闭该元素。
示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Popover</title>
    <meta charset="utf-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <br>
    <div class="container">
        <button style="color:green;" data-toggle="popover"
            data-trigger="focus" title="popover-title"
            data-content="popover-content">
            GeeksforGeeks popover
        </button>
    </div>
    <script>
         $(document).ready(function () {$ ('[data-toggle="popover"]').popover();
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Popover

弹出式悬停： data-trigger=”hover “属性用于创建弹出式悬停效果。在这种情况下，当鼠标移动到上面时，弹出窗口将显示。
示例:

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Popover</title>
    <meta charset="utf-8">
    <meta name="viewport"
        content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
    <script src=
"https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js">
    </script>
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>
<body style="text-align:center;">
    <br>
    <div class="container">
        <button style="color:green;" data-toggle="popover"
            data-trigger="hover" title="popover-title"
            data-content="popover-content">
            GeeksforGeeks popover hover effect
        </button>
    </div>
    <script>
         $(document).ready(function () {$ ('[data-toggle="popover"]').popover();
        });
    </script>
</body>
</html>

输出:

Bootstrap 4 Popover