我正在尝试学习 HTML 和 PHP。在我在互联网上找到的一个示例中，我需要为提交按钮设置一个变量。因此，当按下提交按钮时，此页面将重新加载，地址栏中会出现一个变量，该变量是下拉菜单中的变量。像这样:
test.php?idneeded=$variable
其中 $variable 由用户选择，然后页面重新加载以显示与所选选项相关的特定内容。
例如:
test.php?idneeded=40
(40 是下拉表单中的“MadTechie”)
我找到的代码是这样的:
<?php
if( isset($_GET['ajax']) )
{
//In this if statement
switch($_GET['ID'])
{
case "LBox2":
$Data[1] = array(10=>"-Tom", 20=>"Jimmy");
$Data[2] = array(30=>"Bob", 40=>"-MadTechie");
$Data[3] = array(50=>"-One", 60=>"Two");
break;
//Only added values for -Tom, -MadTechie and -One (10,40,50)
case "LBox3":
$Data[10] = array(100=>"One 00", 200=>"Two 00");
$Data[40] = array(300=>"Three 00");
$Data[50] = array(1000=>"10000");
break;
}
echo "<option value=''></option>";
foreach($Data[$_GET['ajax']] as $K => $V)
{
echo "<option value='$K'>$V</option>\n";
}
mysql_close($dbh);
exit; //we're finished so exit..
}
$Data = array(1=>"One", 2=>"Two", 3=>"Three");
$List1 = "<option value=''></option>";
foreach($Data as $K => $V)
{
$List1 .= "<option value='$K'>$V</option>\n";
}
?>
<!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=iso-8859-1" />
<title>Simple Dymanic Drop Down</title>
<script language="javascript">
function ajaxFunction(ID, Param)
{
//link to the PHP file your getting the data from
//var loaderphp = "register.php";
//i have link to this file
var loaderphp = "<?php echo $_SERVER['PHP_SELF'] ?>";
//we don't need to change anymore of this script
var xmlHttp;
try
{
// Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}catch(e){
// Internet Explorer
try
{
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}catch(e){
try
{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}catch(e){
alert("Your browser does not support AJAX!");
return false;
}
}
}
xmlHttp.onreadystatechange=function()
{
if(xmlHttp.readyState==4)
{
//the line below reset the third list box incase list 1 is changed
document.getElementById('LBox3').innerHTML = "<option value=''></option>";
//THIS SET THE DAT FROM THE PHP TO THE HTML
document.getElementById(ID).innerHTML = xmlHttp.responseText;
}
}
xmlHttp.open("GET", loaderphp+"?ID="+ID+"&ajax="+Param,true);
xmlHttp.send(null);
}
</script>
</head>
<body>
<!-- OK a basic form-->
<form method="post" enctype="multipart/form-data" name="myForm" target="_self">
<table border="0">
<tr>
<td>
<!--
OK here we call the ajaxFuntion LBox2 refers to where the returned date will go
and the this.value will be the value of the select option
-->
<select name="list1" id="LBox1" onchange="ajaxFunction('LBox2', this.value);">
<?php
echo $List1;
?>
</select>
</td>
<td>
<select name="list2" id="LBox2" onchange="ajaxFunction('LBox3', this.value);">
<option value=''></option>
<!-- OK the ID of this list box is LBox2 as refered to above -->
</select>
</td>
<td>
<select name="list3" id="LBox3">
<option value=''></option>
<!-- OK the ID of this list box is LBox3 Same as above -->
</select>
</td>
</tr>
</table>
<input type="submit" name="Submit" value="Submit" />
</form>
</body>
</html>
我还没有开始学习 JavaScript，我需要这个来完成一个项目。如果有人能在这方面帮助我，我将不胜感激。
谢谢。
最佳答案
我不太明白你的问题，但我会尽力帮助你。在 html 中，请确保对表单使用 method="get"，这样变量就会传递到 url 中的 php。 (在其他情况下需要 POST，但现在即使使用 get 也可以)。所有设置了 NAME 属性的输入值都会传递到 url 中。例如:
<form action='phpscript.php' method='get' >
<input type='text' name='just_a_test' value='somevalue' />
<input type='submit' value='submit_form' name='submit' />
</form>
提交后的网址为: http://mypage.com/phpscript.php?just_a_test=somevalue&submit=submit_form
在另一边，将使用表单中的数据的 php 脚本将是
<?php
if (isset($_GET['submit']) ) {
if (isset($_GET['just_a_test']) )
{
$variable1 = $_GET['just_a_test'];
//do something with variable 1 and output results
//based on the value of this variable.
}
}
?>
you can do the same thing for ass many variables as you want . i hope this was a help to you because i cant undestand your question better than this .
关于php - 在表单中添加 Action 变量，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10774691/