前端 HTML form表单标签 select标签 option 下拉框

select里面通常跟option配合使用

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                <!-- 下拉框 -->
                <select>
                    <option>广州</option>
                    <option>深圳</option>
                    <option>山东</option>
                    <option>北京</option>
                </select>
            </div>
        </form>
    </div>
</body>
</html>

加上name属性提交后台，让他提交到后台在每个<option>里面加value

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                <!-- 下拉框 -->
                <select name="sel">
                    <option value="1">广州</option>
                    <option value="2">深圳</option>
                    <option value="3">山东</option>
                    <option value="4">北京</option>
                </select>
            </div>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

url上显示提交的值

select的size属性

size取值大于1的话，则为滚动列表，否则就是下拉选项框，默认size等于1

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                <!-- 下拉框 -->
                <select name="sel" size="3">
                    <option value="1">广州</option>
                    <option value="2">深圳</option>
                    <option value="3">山东</option>
                    <option value="4">北京</option>
                </select>
            </div>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

select的multiple属性

multiple属性设置多选，该属性出现在<select>中,那么就允许多选(针对滚动列表)

按着ctrl选多个

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                <!-- 下拉框 -->
                <select name="sel" size="3" multiple>
                    <option value="1">广州</option>
                    <option value="2">深圳</option>
                    <option value="3">山东</option>
                    <option value="4">北京</option>
                </select>
            </div>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

提交后台拿到两个选中值

select标签的selected 设置默认值
selected预选中，注意：如果不设置selected属性的话，那么选项框中的第一项会默认被选中。

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                <!-- 下拉框 -->
                <select name="sel">
                    <option value="1">广州</option>
                    <option value="2">深圳</option>
                    <option selected value="3">山东</option>
                    <option value="4">北京</option>
                </select>
            </div>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

单选框

多选项

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                <!-- 下拉框 -->
                <select name="sel" size="3" multiple>
                    <option value="1">广州</option>
                    <option value="2">深圳</option>
                    <option selected value="3">山东</option>
                    <option value="4">北京</option>
                </select>
            </div>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

optgroup 下拉框分组功能

用optgroup标签包着option标签，optgroup label属性为组名

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="x-ua-compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Title</title>
</head>
<body>
    <div>
        <form action="http://www.baidu.com" method="get">
            <div>
                 <!-- optgroup 下拉框分组功能 -->
                <select name="city" size="5" multiple="multiple">
                    <optgroup label="广东省">
                        <option value="1">广州</option>
                        <option value="2">深圳</option>
                    </optgroup>

                    <optgroup label="浙江省">
                        <option value="1">杭州</option>
                        <option value="2">温州</option>
                    </optgroup>
                </select>
            </div>
            <input type="submit" value="提交">
        </form>
    </div>
</body>
</html>

posted @ 2019-04-02 18:30 minger_lcm 阅读(42132) 评论(0) 编辑收藏举报

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前端 HTML form表单标签 select标签 option 下拉框

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