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Detailed explanation one: Example of interaction between PHP and Web pages

coldplay.xixiforward: 2020-08-07 16:15:473150browse

Preface

This note records the Web Form-related operations, Web forms are mainly used to send data to the server in web pages. For example, in daily development, you need to submit a form when submitting a registration. The form is transmitted from the client to the server. After being processed by the server, the information required by the user is transmitted back to the client, thereby realizing the interaction between PHP and Web forms.

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##Form# The attributes of the ##

使用<form>元素，并在其中插入相关的表单元素，即可创建一个表单。

表单结构：

<form name="form_name" method="method" action="url" enctype="value" target="target_win">
…      //省略插入的表单元素
</form >

form tag are as follows:

##Attributes of the form tagDescriptionnameForm namemethodSet the form submission method, GET or POST methodactionCarton handles the URL of the form pageenctypeSet the encoding method of the form contenttargetSet the display method of returned information

表单（form）由表单元素组成。常用的表单元素有以下几种标记：输入域标记<input>、选择域标记<select>和<option>、Detailed explanation one: Example of interaction between PHP and Web pages<textarea>等。

输入域标记

输入域标记是表单中最常用的标记之一。常用的文本框、按钮、单选按钮、复选框等构成了一个完整的表单。
语法格式如下：

<form>
<input name="file_name" type="type_name">
</form>

参数name是指输入域的名称，参数type是指输入域的类型。在标记中一共提供了10种类型的输入区域，用户所选择使用的类型由type属性决定。

下面举几个type属性例子:

1、text

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">文本框：</td>
  <td height="25" align="left"><input name="user" type="text" value="Bill" id="user" size="20" maxlength="100"></td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行效果：

Detailed explanation one: Example of interaction between PHP and Web pages

name为文本框的名称，value是文本框的默认值，size为文本框的宽度，maxlength为文本框的最大输入字符数，可以通过id获取文本框的值。

2、password

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">密码域：</td>
  <td height="25" align="left">
  <input name="pwd" type="password" value="1234567" id="password" size="20" maxlength="100">
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

密码域，用户在该文本框中输入的字符将被替换为*显示，以起到保密作用。

3、file

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">文件域：</td>
  <td height="25" align="left">
  <input name="file" type="file" enctype="multipart/form-data" id="upfile" size="20" maxlength="200">
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

文件域，当文件上传时，可以用来打开一个模式窗口来选择文件。然后将文件通过表单上传到服务器，上传文件时需要指明表单的属性enctype=”multipart/form-data”才可以实现上传功能。

4、image

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">图像域：</td>
  <td height="25" align="left">
  <input name="image" type="image" src="btn__details_praise_selected.png" id="img" width="40" height="40" border="0">
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行效果：

Detailed explanation one: Example of interaction between PHP and Web pages

图像域是指可以用在提交按钮位置上的图片，这副图片具有按钮的功能

5、radio

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">单选按钮：</td>
  <td height="25" align="left">
    <input name="sex" type="radio" value="1" checked>男
    <input name="sex" type="radio" value="0" >女
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

单选按钮，用于设置一组选择项，用户只能选择一项。checked属性用来设置该单选按钮默认被选中。

6、checkbox

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">复选框：</td>
  <td height="25" align="left">
    <input name="checkbox" type="checkbox" value="1" checked>苹果
    <input name="checkbox" type="checkbox" value="1" checked>小米
    <input name="checkbox" type="checkbox" value="1" >三星
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

复选框，允许用户选择多个选择项。checked属性用来设置该复选框默认被选中。

7、submit

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">提交按钮：</td>
  <td height="25" align="left">
    <input name="submit" type="submit" value="提交">
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

将表单的内容提交到服务器端

8、reset

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">重置按钮：</td>
  <td height="25" align="left">
    <input name="reset" type="reset" value="重置">
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

清除与重置表单内容，用于清除表单中所有文本框的内容，并使选择菜单项恢复到初始值。

9、button

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">普通按钮：</td>
  <td height="25" align="left">
    <input name="button" type="button" value="注册">
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

按钮可以激发提交表单的动作，可以在用户需要修改表单时，将表单恢复到初始的状态，还可以依照程序的需要发挥其他作用。

10、hidden

<input type="hidden" name="信息">

隐藏域，用于在表单中以隐含方式提交变量值。隐藏域在页面中对于用户是不可见的，添加隐藏域的目的在于通过隐藏的方式收集或者发送信息。

选择域标记

通过选择域标记

语法格式如下：

<select name="name" size="value" multiple>
<option value="value" selected>选项1</option>
<option value="value">选项2</option>
<option value="value">选项3</option>
…
</select>

参数name表示选择域的名称；参数size表示列表的行数；参数value表示菜单选项值；参数multiple表示以Detailed explanation one: Example of interaction between PHP and Web pages显示数据，省略则以Detailed explanation one: Example of interaction between PHP and Web pages显示数据。

1、Detailed explanation one: Example of interaction between PHP and Web pages

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">喜欢哪种编程语言：</td>
  <td height="25" align="center" >
    <select name="name" id="code">
      <option value="1" selected>Java语言</option>
      <option value="2">C语言</option>
      <option value="3">JS语言</option>
      <option value="4">PHP语言</option>
    </select>
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

下拉列表框，通过选择域标记

2、Detailed explanation one: Example of interaction between PHP and Web pages

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">喜欢哪种编程语言：</td>
  <td height="25" align="center" >
    <select name="name" id="code" multiple>
      <option value="1" selected>Java语言</option>
      <option value="2">C语言</option>
      <option value="3">JS语言</option>
      <option value="4">PHP语言</option>
    </select>
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

> multiple属性用于菜单列表"<select>"标记中，指定该选项的用户可以使用Shift和Ctrl键进行多选

Detailed explanation one: Example of interaction between PHP and Web pages

Detailed explanation one: Example of interaction between PHP and Web pages用来制作多行的文字域，可以在其中输入更多的文本。

语法格式如下：

<textarea name="name" rows=value cols=value value="value" warp="value">
  …文本内容
</textarea>

参数name表示文字域的名称；rows表示文字域的行数；cols表示文字域的列数（这里的rows和cols以字符为单位）；value表示文字域的默认值，warp用于设定显示和送出时的换行方式，值为off表示不自动换行，值为hard表示自动硬回车换行，换行标记一同被发送到服务器，输出时也会换行，值为soft表示自动软回车换行，换行标记不会被发送到服务器，输出时仍然为一列。

例如：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312"
 />
<title>PHP语言基础</title>

</head>
<body>
<form action="index.php" method="post" name="form1" enctype="multipart/form-data">
 <tr bgcolor="#FFCC33">
  <td width="103" height="25" align="right">请写下你的留言：</td>
  <td height="25" align="center" >
    <textarea rows="5" cols="20" name="remark" id="remark">留言...</textarea>
  </td>
 </tr>
</form>
<?php
header("Content-Type:text/html;  charset=gb2312");
?>
</body>
</html>

运行结果：

Detailed explanation one: Example of interaction between PHP and Web pages

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