Question

我试图学习 HTML 和 PHP。在互联网上我找到的一个示例中, 我需要设置提交按钮的变量。因此, 当按下提交按钮时, 此页面会重新装入, 在地址栏中有一个变量, 该变量是下拉菜单中的一个变量。例如 :

test.php?idneeded=$variable

其中,用户选择了可变美元,然后页面重新加载,以显示与所选选项有关的具体内容。

例如:

test.php?idneeded=40

(40是下降表上的“MadTechie”)

我找到的代码是:

<?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>
";
      }
      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>
";
   }
?>
<!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, 我需要这个项目。如果有人能帮我, 我会很感激的。

谢谢

Answer 1

i 不理解您的问题差异很大, 但我会试着帮助您。在 html 中, 请确定您使用方法 = “ get” 来显示窗体, 这样变量就会被传送到 url 中的php 。 (在其它情况下, POST 需要 poST, 但现在您即使得到也可以接受 ) 。使用 NAME 属性集的所有输入值都会被传递到 url 中。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>

the url after submiting will be : http://mypage.com/phpscript.php?just_a_test=somevalue&submit=submit_form

在另一侧的php脚本中,将使用窗体中的数据的php脚本

<?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 .

Answer 2

如果在重定向期间发送表格,您没有使用 AJAX。在这种情况下,解决方案很简单:

<form name="myForm" action="test.php" method="GET">
    <select name="idneeded">
        <option value="40">MadTechie</option>
        <option>...</option>
    </select>
</form>

这样的事情在每个 HTML 教程中都会被解释。这是一个良好的起点 : < a href="http://www.w3schools.com/html/default.asp" rel="no follow">W3C school 。

Answer 3

您没有提及客户端或服务器上是否可用变量的值?

Variable on Client: Basically, you will have to handle the onSubmit event of the form. Here you can append the value of the variable to the action.

Variable on Server: Here you would change the action when you are rendering the HTML.

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