我创建了一个表单，其中包括测试代码，测试名称，测试参数，仪器代码和 添加测试参数按钮，测试代码，测试名称，测试参数是文本框，仪器代码是下拉列表框，单击添加测试参数按钮新文本框和仪器代码下拉列表将生成，其运行时创建文本box值将被保存到数据库中但是Instrument Code值无法更改。对于所有文本新生成的文本框保持相同。我想保存选中的下拉列表项可以指导我吗 这是我的PHP代码：
<?PHP
include_once "dTestCreation.php";
global $Hostname;
global $Username;
global $Password;
global $Database_name;
function getConnection()
{
$Hostname = "localhost";
$Username ="root";
$Password ="";
$Database_name="labdata";
$oMysqli = new mysqli($Hostname,$Username,$Password,$Database_name); //create connection object.
return($oMysqli); //return connection object.
}
if(isset($_POST['submit'])) //when click on submit button
{
$Testcode = $_POST['testcode'];
$TestName = $_POST['testname'];
$TestParameter = $_POST['testparameter'];
$Instrumentcode = $_POST['instrument_code'];
$InsertQuery = "INSERT INTO demo_test(testcode,testname) VALUES('$Testcode','$TestName')"; //query for insert data into table
$oMysqli=getConnection(); //establish connection
$oMysqli->query($InsertQuery);
//print_r($InsertQuery);exit();
$InsertQuery1 = "INSERT INTO test_table(testcode,testparameters,instrument_code) VALUES('$Testcode','$TestParameter','$Instrumentcode')"; //query for insert data into table
$oMysqli=getConnection(); //establish connection
$oMysqli->query($InsertQuery1);
$length = count($_POST['testparameters']);
for($i=0;$i<$length;$i++)
{
//echo $_POST['testparameters'][$i];
$a = $_POST['testparameters'][$i];
$na = array('testparameters' => $a['testparameters']);
foreach($na as $k => $v)
{
$na[$k] = mysql_real_escape_string($v);
}
$TestParameters = $na['testparameters'];
$TestParameters = $_POST['testparameters'][$i];
$InsertQuery2 = "INSERT INTO test_table(testcode,testparameters,instrument_code) VALUES('$Testcode','$TestParameters','$Instrumentcode')"; //query for insert data into table
$oMysqli=getConnection(); //establish connection
$oMysqli->query($InsertQuery2);
}
}
?>
<html>
<head>
<title>TestData</title>
<script type="text/javascript">
function create_row() //create function create_row
{
var newtr=document.createElement("tr"); //variable for tr
var newtd=document.createElement("td"); //variable for td
var newtd1=document.createElement("td"); //variable f
var output="<input type=\"text\" name=\"testparameters[]\">";
var output1="<select id=\"instrument_name\" name=\"instrument_name\"><?php include_once "dTestCreation.php"; //include file dTestCreation.php
$tResult = getIname();
for($kkk=0;$kkk<count($tResult);$kkk++)
{
echo "<option value=".$tResult[$kkk].">".$tResult[$kkk]."</option>";
}//display values of instrument into list.
?></select>";
newtd.innerHTML=output; //display first td
newtd1.innerHTML=output1; //display second td
newtr.appendChild(newtd); //increment no of rows.
newtr.appendChild(newtd1);
document.getElementById("table1body").appendChild(newtr);
}
</script>
</head>
<body>
<form name="testdetails" method="post" target="_self" action="<?php $_PHP_SELF ?>">
<label for='Testcode'>Testcode</label>
<input type="text" name="testcode"></input>
<label for='TestName'>TestName</label>
<input type="text" name="testname"></input><br></br>
<label for='Testparameter'>Testparameter</label>
<input type="text" name="testparameter"></input>
<label for='Instrumentcode'>Instrumentcode</label>
<select name="instrument_name" id="instrument_name">
<?php
$tResult = getIname();
for($kkk=0;$kkk<count($tResult);$kkk++)
{
echo "<option value=".$tResult[$kkk].">".$tResult[$kkk]."</option>";
}
?>
</select>
<table>
<tbody id="table1body">
<tr>
<!--<td><input type="textfield" name="testparameters"></td>-->
<td> <input type="button" name="button" value="Add Test Parameter" onclick="create_row()"> <!--call function create_row() for onclik add new row-->
</tr>
</tbody>
</table>
<input type="submit" name="submit" value="submit"></input>
</form>
</body>
</html>
答案 0 :(得分：1)
如果您有不同的具有相同名称的表单元素（假设不使用数组），则操作页面的值为send，是具有该名称的最后一个表单元素的值。
只需使用数组
<select name = "instrument_name[]" id="instrument_name">
//php code
</select>
只需在操作页面上执行print_r($_POST)，看看每个表单元素都会有一个数组，从这里你可以得到值