PHP\\HTML script to auto populate form fields when

问题:

I created a HTML form with one drop down listing of items from postgresql database, I wish to have some of the fields in the form to populate automatically from the database when an item is selected from the dropdown menu. I also have some other fields on the form which needs to be filled-in by the users before pressing the submit button to push the entire data back to the database.

Currently my script is not able to connect to the database or populate the drop-down listing on the form and also not able to autopopulate the other specified form fields (which are the attributes of the items in the dropdown list also stored in the database) and the second issue im also having is that after entering data into the input fields and click submit. it creates a new record in the database instead of populating the required columns in the database. Can Someone please take a look at my script and help me out.

Here is the script to create the data entry form with a dropdown

 <?php
//Php Code to connect to postgresqldatabase
$PGHOST = "localhost:25376";
$PGDATABASE = "Pipeline";
$PGUSER = "postgres";
$PGPASSWORD = "Casa2009";
$PGPORT = 5432;
$db_handle = pg_connect("dbname=$PGDATABASE user=$PGUSER password=$PGPASSWORD");


//<!-- #2 -->
 if(isset($_POST['submit_1'])){
 //Code to post fieldtally data to the database
 $pipeno = pg_escape_string( $_POST['pipeno']);
 $heatno1 = pg_escape_string( $_POST['heatno1']);
 $pipeno2 = pg_escape_string( $_POST['pipeno2']);
 $heatno2 = pg_escape_string($_POST['heatno2']);
 $Djointno = pg_escape_string($_POST['Djointno']);
 $measuredlength = pg_escape_string($_POST['measuredlength']);
 $serialno = pg_escape_string($_POST['serialno']);
 $wthick= pg_escape_string($_POST['wthick']);
 $remarks= pg_escape_string($_POST['remarks']); 
 //<!-- #3 -->
$query = "Update fieldtally set  wthick = $wthick, pipeno=$pipeno,heatno1=$heatno1,pipeno2=$pipeno2,heatno2=$heatno2,Djointno=$Djointno,measuredlength=$measuredlength,serialno=$serialno,remarks=$remarks where pipeno = $pipeno;
          INSERT INTO fieldtally(wthick, pipeno,heatno1,pipeno2,heatno2,Djointno,measuredlength,serialno,remarks), 
                Select $wthick, $pipeno,$heatno1,$pipeno2,$heatno2,$Djointno,$measuredlength,$serialno,$remark,
                WHERE NOT EXISTS (select pipeno from fieldtally where pipeno = $pipeno)";

//<!-- #4a -->
 $result = pg_query($query);
 if (!$result) {
 $errormessage = pg_last_error();
 $message = "Error with query: " . $errormessage;
 }
 $message = sprintf ("These values were inserted into the pipeline database - %s %s %s %s %s %s %s %s %s",$wthick,$pipeno,$heatno1,$pipeno2,$heatno2,$Djointno,$measuredlength,$serialno,$remarks);
 }
 //<!-- #2 -->
 if(isset($_POST['submit_2'])){
 //Code to post fieldbend data under suto the database
 $pipeno = pg_escape_string( $_POST['pipeno']);
 $wthick1= pg_escape_string($_POST['wthick1']);
 $heatno1 = pg_escape_string( $_POST['heatno1']);
 $pipeno2 = pg_escape_string( $_POST['pipeno2']);
 $heatno2 = pg_escape_string($_POST['heatno2']);
 $Djointno = pg_escape_string($_POST['Djointno']);
 $measureddistance = pg_escape_string($_POST['measureddistance']);
 $benddegree = pg_escape_string($_POST['benddegree']);
 $bendtype= pg_escape_string($_POST['bendtype']); 
 $remarks= pg_escape_string($_POST['remarks']);
 //<!-- #3 -->
$query1 = "INSERT INTO fieldbend(pipeno,wthick1,heatno1,pipeno2,heatno2,Djointno,measureddistance,benddegree,bendtype,remarks)VALUES ('$pipeno','$wthick1','$heatno1','$pipeno2','$heatno2','$Djointno','$measureddistance','$benddegree','$bendtype','$remarks') ON DUPLICATE KEY UPDATE wthick1='$wthick1',heatno1='$heatno1',pipeno2='$pipeno2',heatno2='$heatno2',Djointno='$Djointno''";

//<!-- #4a -->
 $result1 = pg_query($query1);
 if (!$result1) {
 $errormessage = pg_last_error();
 $message1 = "Error with query: " . $errormessage;
 }
 $message1 = sprintf ("These values were inserted into the pipeline database - %s %s %s %s %s %s %s %s %s %s",$pipeno,$wthick1,$heatno1,$pipeno2,$heatno2,$Djointno,$measureddistance,$benddegree, $bendtype,$remarks);
 }
 //<!-- #2 -->
 if(isset($_POST['submit_3'])){
 //Code to post apptally data under suto the database
 $pipeno = pg_escape_string( $_POST['pipeno']);
 $wthick2= pg_escape_string($_POST['wthick2']);
 $tallytype = pg_escape_string( $_POST['tallytype']);
 $qty = pg_escape_string( $_POST['qty']);
 $serialno = pg_escape_string($_POST['serialno']);
 $referenceid = pg_escape_string($_POST['referenceid']);
 //<!-- #3 -->
$query2 = "INSERT INTO apptally(pipeno,wthick2,tallytype,qty,serialno,referenceid)VALUES ('$pipeno','$wthick2','$tallytype','$qty','$serialno','$referenceid') ON DUPLICATE KEY UPDATE wthick2='$wthick2', pipeno='$pipeno'";

//<!-- #4a -->
 $result2 = pg_query($query2);
 if (!$result2) {
 $errormessage = pg_last_error();
 $message2 = "Error with query: " . $errormessage;
 }
 $message2 = sprintf ("These values were inserted into the Pipeline database - %s %s %s %s %s %s",$pipeno,$wthick2,$tallytype,$qty, $serialno,$referenceid);
 }
 // Code to pull data from the database and load onto the form
 $query = 'select pipeno from fieldtally order by pipeno asc'; 
 $result = pg_query($db_handle,$query); 
 while ($row = pg_fetch_row($result))
 {
    // Creates Arrays to use in dropdowns
     $pipeno_array[] = $row[0];

 } 
 // This function creates dropdowns that will be used in the forms
 function dropdown($field_name, $num){
     // Creates the Dropdown
     //<!-- #5a -->
     $c = ($field_name == 'pipeno') ? ' onChange="check('.$num.');"' : '';
     echo "<select name=\"".$field_name."\" id=\"".$field_name.$num."\"$c>\n";
     echo "<option value=\"\"> --- Select --- </option>\n";
     // Chooses which array to use for Dropdown options
     global $pipeno_array;
     $name_array = ($field_name == 'pipeno') ? $pipeno_array : $wallthick;
     // Creates the Dropdown options based off the array above
     foreach($name_array as $k){
         echo "<option value=\"$k\">$k</option> \n"; }
     // Ends the Dropdown
     echo "</select>\n";
 }
?>
<html>
<head>
<meta charset="utf-8">
<title>UG Pipeline Field Data Capture</title>
</head>
<body>
     <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
     </head>
      <body>
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script type="text/javascript">

<!-- #5b -->
        function check(num){
           var pipeno_id = '#pipeno_'+num;
           var pipeno = $(pipeno_id).val();
           if(pipeno != ""){
             jQuery.ajax({
             type: "POST",
             url: "check.php" , 
             data:'pipeno='+pipeno,
             cache: false,
             success: function(response){
             var response_array = JSON.parse(response);
             $('#heatno1').val(response_array['heatno1']);
             $('#pipeno2').val(response_array['pipeno2']); 
             $('#heatno2').val(response_array['heatno2']);
             $('#Djointno').val(response_array['Djointno']);
             }           
            });
           }
           else{
           $('#heatno1').val('');
           $('#pipeno2').val('');
           $('#heatno2').val('');
           $('#Djointno').val('');}
            }
  </script>
          <!-- #4b -->
 <!--<?php printf($message);?>-->

 <!-- #6.1 -->
<form action="" method="post">
 <table width="800" cellpadding= "10" cellspacing="1" border="2">
 <tr align="center" valign="top">
 <td align="center" colspan="1" rowspan="1" bgcolor="#00CC00">
 <h3>Input Field Tally Information</h3>
      Select Wall Thickness:<select name="wthick" id="wthick">
 <!-- #7.1 -->
  <option value=""> --Select-- </option> 
  <option value="9.80">  9.80  </option>
  <option value="13.50"> 13.50 </option>
  <option value="15.90"> 15.90 </option>
  </Select>           
 Select Pipe No:<?php dropdown('pipeno', 1); ?> HeatNo1: <input type="text" name="heatno1" id="heatno1"><br /><br />  
 PipeNo2: <input type="text" name="pipeno2" id="pipeno2"> HeatNo2: <input type="text" name="heatno2" id="heatno2">Joint No: <input type="text" name="Djointno"><br /><br /> 
  Input measured Length: <input type="text" name="measuredlength"> Input Serial No: <input type="text" name="serialno"><br><br> Remarks: <input type="text" name="remarks"><br><br> 
 <!-- #8.1 -->
 <input type="Submit" name="submit_1" value="Submit">
 <!-- #9.1 -->
</td></tr></table></form>
<!-- #6.2 -->
 <form action="" method="post">
 <table width="800" cellpadding= "10" cellspacing="1" border="2">
 <tr align="center" valign="top">
 <td align="center" colspan="1" rowspan="1" bgcolor="#FF99FF">
 <h3>Input Field Bend Information</h3>
  Select Wall Thickness:<select name="wthick1" id="wthick1">
 <!-- #7.2 -->
     <option value=""> --Select-- </option> 
     <option value="9.80">  9.80  </option>
     <option value="13.50">13.50 </option>
     <option value="15.90"> 15.90 </option>
  </select>
 <!-- #10.1 -->           
 Select Pipe No:<?php dropdown('pipeno', 2); ?>   HeatNo1: <input type="text" name="heatno1" id="heatno1_2"> <br><br>
 PipeNo2: <input type="text" name="pipeno2" id="pipeno2_2"> HeatNo2: <input type="text" name="heatno2" id="heatno2_2"> Joint No: <input type="text" name="Djointno"> <br><br>
 Input Measured Distance: <input type="text" name="measureddistance"> Input Bend Angle: <input type="text" name="benddegree"> <br><br>
Select Bend Type:<select name="bendtype" id="bendtype">
    <option value=""> --Select-- </option> 
    <option value="Combo">Combo</option>
    <option value="SAG">SAG</option>
    <option value="OB">OB</option>
    <option value="SBRT">SBRT</option>
    <option value="SBLT">SBLT</option>
    <option value="HBLT">HBLT</option>
    <option value="HBRT">HBRT</option><p></p> 
  Remarks: <input type="text" name="remarks"><br></br>

  <input type="Submit" name="submit_2" value="Submit"> 
 <!-- #9.2 -->
</td></tr></table></form>
<!-- #6.3 -->

<form action="" method="post">
 <table width="800" cellpadding= "10" cellspacing="1" border="2">
 <tr align="center" valign="top">
 <td align="center" colspan="1" rowspan="1" bgcolor="#99FF33">
 <h3>Input App. Tally Information</h3>
 <!-- #11 -->
       Select Wall Thickness:<select name="wthick2" id="wthick2">
 <!-- #7.3 -->
     <option value=""> --Select-- </option> 
     <option value="9.80">  9.80  </option>
     <option value="13.50"> 13.50 </option>
     <option value="15.90"> 15.90 </option>
  </select>
 <!-- #10.2 -->             
 Select Pipe No:<?php dropdown('pipeno', 3); ?>  <br><br> Input Tally Type: <input type="text" name="tallytype">
 Input Tally Qty: <input type="text" name="qty"><br></br>  Input Serial No: <input type="text" name="serialno"> 
 RefID: <input type="text" name="referenceid"><br></br>
 <!-- #8.3 -->
 <input type="Submit" name="submit_3" value="Submit">
 </td></tr></table>
</form>

</body>
</html>

Php Script to load data onto the form field and push data back from the database - filename = check1.php

<?php
//Php Code to connect to postgresqldatabase
$PGHOST = "localhost:25376";
$PGDATABASE = "Pipeline";
$PGUSER = "postgres";
$PGPASSWORD = "Casa2009";
$PGPORT = 5432;
$db_handle = pg_connect("dbname=$PGDATABASE user=$PGUSER password=$PGPASSWORD");

// Code to pull data from the database and load onto the form  
$pipeno = pg_escape_string($_POST['pipeno']);
$query = "SELECT * FROM fieldtally1 WHERE pipeno = $pipeno ";
$result = pg_query($db_handle,$query); 
$row = pg_fetch_row($result);
$row_info = array('heatno1'=>$row[1],'pipeno2'=>$row[2],'heatno2'=>$row[3],'jointno'=>$row[4]);
$row_info = json_encode($row_info);
print_r($row_info); 
?>

the errors I get when I hit the submit button with or without data is this

Notice: Undefined variable: remark in C:\Users\iegbulefu\Documents\My Web Sites\Personal Site1\autopopulate.php on line 27

Warning: pg_query(): Query failed: ERROR: syntax error at or near "GGFF" LINE 1: ...no2=67677,Djointno=8,measuredlength=80,serialno=99GGFF,remar... ^ in C:\Users\iegbulefu\Documents\My Web Sites\Personal Site1\autopopulate.php on line 30

回答1:

I would do this by using Ajax and JQuery. You would need to do 3 things - Add Ajax/JQuery code in head of document, create php file for Ajax to connect to, and add onChange, id & value attributes to fields.

In your <head></head> add this javascript after your <title></title>-

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
<script type="text/javascript">
function check(){   
    var pipeno = $('#pipeno').val();
    if(pipeno != "pipeno"){
      jQuery.ajax({
      type: "POST",
      url: "check.php",
      data: 'pipeno='+pipeno,
      cache: false,
      success: function(response){
     var response_array = JSON.parse(response);
     $('#wallthickness').val(response_array['wallthickness']);  
     $('#jointno').val(response_array['jointno']);
     $('#measuredlength').val(response_array['measuredlength']);
     $('#serialno').val(response_array['serialno']);}
    });
    }
    else{
         $('#wallthickness').val('');   
     $('#jointno').val('');
     $('#measuredlength').val('');
     $('#serialno').val('');}
    }
</script>

Then create a file named check.php with code -

<?php
 //Php Code to connect to postgresqldatabase
 include ("connection.php");
 // Code to pull data from the database and load onto the form  
 $pipeno = pg_escape_string($_POST['pipeno']);
 $query = "SELECT * FROM fieldtally WHERE pipeno = $pipeno ";
 $result = pg_query($db_handle,$query); 
 $row = pg_fetch_row($result))
 $row_info = array('wallthickness'=>$row[1],'jointno'=>$row[2],'measuredlength'=>$row[3],'serialno'=>$row[4]);

 $row_info = json_encode($row_info);
 print_r($row_info); 
?>

And finally, add id & value attributes to your form fields (Don't change your file, just update these lines)

Select Pipe No:<select name="pipeno" id="pipeno" onChange="check()"><option value="pipeno"> --Select-- </option> 
...  (keep your database connection / how you create your dropdown, etc here, just edit the option below)
 echo "<option value=\"$pipeno\"> $pipeno</option>";
... (keep your database connection / how you create your dropdown, etc. here)
</select> 
...
Input Joint No: <input type="text" name="jointno" id="jointno">
Input Wall Thickness: <input type="text" name="wallthickness" id="wallthickness">
Input measured Length: <input type="text" name="measuredlength" id="measuredlength">
Input Serial No: <input type="text" name="serialno" id="serialno">

---

UPDATED 10/19 Due to changed code -

I have put numbered anchors in your code, and the notes are at the end. You can do this all in 2 files, but the second file check1.php, can only have the 1 database query, or you will have errors in your ajax.

autopopulate.php-

<!-- #1 -->
<?php
//Php Code to connect to postgresqldatabase
$PGHOST = "localhost:25376";
$PGDATABASE = "Pipeline";
$PGUSER = "postgres";
$PGPASSWORD = "Casa2009";
$PGPORT = 5432;
$db_handle = pg_connect("dbname=$PGDATABASE user=$PGUSER password=$PGPASSWORD");

//<!-- #2 -->
 if(isset($_POST['submit_1'])){
 //Code to post data to the database
 $pipeno = pg_escape_string( $_POST['pipeno']);
 $wallthickness = pg_escape_string($_POST['wallthickness']);
 $heatno1 = pg_escape_string( $_POST['heatno1']);
 $pipeno2 = pg_escape_string( $_POST['pipeno2']);
 $heatno2 = pg_escape_string($_POST['heatno2']);
 $jointno = pg_escape_string($_POST['jointno']);
 $measuredlength = pg_escape_string($_POST['measuredlength']);
 $serialno = pg_escape_string($_POST['serialno']); 
 $wthick= pg_escape_string($_POST['wthick']);

//<!-- #3 -->
 $query = "INSERT INTO fieldtally1(pipeno,wallthickness,heatno1,pipeno2,heatno2,jointno,measuredlength,serialno,wthick)VALUES ('$pipeno','$wallthickness','$heatno1','$pipeno2','$heatno2','$jointno','$measuredlength','$serialno','$wthick') ON DUPLICATE KEY UPDATE wallthickness='$wallthickness',heatno1='$heatno1',pipeno2='$pipeno2',heatno2='$heatno2',jointno='$jointno',measuredlength='$measuredlength',serialno='$serialno',wthick='$wthick'";

//<!-- #4a -->
 $result = pg_query($query);
 if (!$result) {
 $errormessage = pg_last_error();
 $message = "Error with query: " . $errormessage;
 }
 $message = sprintf ("These values were inserted into the database - %s %s %s %s %s %s %s %s %s",$pipeno,$wallthickness,$heatno1,$pipeno2,$heatno2,$jointno,$measuredlength,$serialno,$wthick);
 }

 // Code to pull data from the database and load onto the form
 $query = 'select pipeno, wallthickness from fieldtally1 order by pipeno asc'; 
 $result = pg_query($db_handle,$query); 
 while ($row = pg_fetch_row($result))
 {
    // Creates Arrays to use in dropdowns
     $pipeno_array[] = $row[0];
     $wallthickness_array[] = $row[1];
 } 

  // This function creates dropdowns that can be used in your forms
 function dropdown($field_name, $num){
     // Creates the Dropdown
 //<!-- #5a -->
     $c = ($field_name == 'pipeno') ? ' onChange="check('.$num.');"' : '';
     echo "<select name=\"".$field_name."\" id=\"".$field_name.$num."\"$c>\n";
     echo "<option value=\"\"> --- Select --- </option>\n";
     // Chooses which array to use for Dropdown options
     global $pipeno_array, $wallthickness_array;
     $name_array = ($field_name == 'pipeno') ? $pipeno_array : $wallthickness_array;
     // Creates the Dropdown options based off the array above
     foreach($name_array as $k){
         echo "<option value=\"$k\">$k</option> \n"; }
     // Ends the Dropdown
     echo "</select>\n";
 }

 ?>
 <html>
     <head><title>UG Pipeline Field Data Capture</title></head>
      <body>
       <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script>
       <script type="text/javascript">
 <!-- #5b -->
        function check(num){
           var pipeno_id = '#pipeno_'+num;
           var pipeno = $(pipeno_id).val();
           if(pipeno != ""){
             jQuery.ajax({
             type: "POST",
             url: "check1.php",
             data: 'pipeno='+pipeno,
             cache: false,
             success: function(response){
             var response_array = JSON.parse(response);
             $('#heatno1').val(response_array['heatno1']);
             $('#pipeno2').val(response_array['pipeno2']); 
             $('#heatno2').val(response_array['heatno2']);
             $('#jointno').val(response_array['jointno']);
             //$('#measuredlength').val(response_array['measuredlength']); // this should be input from the user
            // $('#serialno').val(response_array['serialno']);  //This should also be input from the user
            }           
            });
           }
           else{
           $('#heatno1').val('');
           $('#pipeno2').val('');
           $('#heatno2').val('');
           $('#jointno').val('');}
            }
  </script> 

 <!-- #4b -->
 <?php printf($message);?>
 <!-- #6.1 -->
 <form action="" method="post">
 <table width="800" cellpadding= "10" cellspacing="1" border="2">
 <tr align="center" valign="top">
 <td align="center" colspan="1" rowspan="1" bgcolor="#64b1ff">
 <h3>Input Field Tally Information</h3>
      Select Pipe Thickness:<select name="wthick" id="wthick">
 <!-- #7.1 -->
  <option value=""> --Select-- </option> 
  <option value="9.8">  9.8  </option>
  <option value="13.5"> 13.5 </option>
  <option value="15.9"> 15.9 </option>
  </Select>           
 Select Pipe No:<?php dropdown('pipeno', 1); ?>  Select Wall Thickness:<?php dropdown('wallthickness', 1); ?><br /><br /> 
 HeatNo1: <input type="text" name="heatno2" id="heatno1"> PipeNo2: <input type="text" name="pipeno2" id="pipeno1"> HeatNo2: <input type="text" name="heatno2" id="heatno2"><br /><br /> 
 Joint No: <input type="text" name="jointno"> Input measured Length: <input type="text" name="measuredlength"> Input Serial No: <input type="text" name="serialno"><br><br> 
 <!-- #8.1 -->
 <input type="Submit" name="submit_1" value="Submit">
 <!-- #9.1 -->
 </td></tr></table></form>
 <p></p>

 <!-- #6.2 -->
 <form action="" method="post">
 <table width="800" cellpadding= "10" cellspacing="1" border="2">
 <tr align="center" valign="top">
 <td align="center" colspan="1" rowspan="1" bgcolor="#ff9d9d">
 <h3>Input Field Bend Information</h3>
  Select Wall Thickness:<select name="wallthickness" id="wallthickness">
 <!-- #7.2 -->
     <option value=""> --Select-- </option> 
     <option value="9.8">  9.8  </option>
     <option value="13.5">13.5 </option>
     <option value="15.9"> 15.9 </option>
  </select>
 <!-- #10.1 -->           
 Select Pipe No:<?php dropdown('pipeno', 2); ?>  Select Wall Thickness:<?php dropdown('wallthickness', 2); ?><br /><br /> 
 HeatNo1: <input type="text" name="heatno1" id="heatno1_2"> PipeNo2: <input type="text" name="pipeno2" id="pipeno2_2"> HeatNo2: <input type="text" name="heatno2" id="heatno2_2"><br /><br /> 
 Joint No: <input type="text" name="jointno"> Input Measured Distance: <input type="text" name="measureddistance"><br><br> 
 Input Bend Angle: <input type="text" name="benddegree"> Input Bend Type: <input type="text" name="bendtype"><br><br>
 <!-- #8.2 -->
 <input type="Submit" name="submit_2" value="Submit">
 <!-- #9.2 -->
 </td></tr></table></form>
 <p></p>

 <!-- #6.3 -->
 <form action="" method="post">
 <table width="800" cellpadding= "10" cellspacing="1" border="2">
 <tr align="center" valign="top">
 <td align="center" colspan="1" rowspan="1" bgcolor="#66CC66">
 <h3>Input App. Tally Information</h3>
 <!-- #11 -->
      Select Wall Thickness:<select name="wallthickness1" id="wallthickness1">
 <!-- #7.3 -->
     <option value=""> --Select-- </option> 
     <option value="9.8">  9.8  </option>
     <option value="13.5"> 13.5 </option>
     <option value="15.9"> 15.9 </option>
  </select>
 <!-- #10.2 -->             
 Select Pipe No:<?php dropdown('pipeno', 3); ?>  Select Wall Thickness:<?php dropdown('wallthickness', 3); ?><br /><br />            
 Input Tally Type: <input type="text" name="type">   Input Serial No: <input type="text" name="serialno"><br><br>
 Input Reference ID: <input type="text" name="referenceid"><br><br>
 <!-- #8.3 -->
 <input type="Submit" name="submit_3" value="Submit">
 </td></tr></table>
 </form>
 </body>
 </html>

check1.php-

<?php
//Php Code to connect to postgresqldatabase
$PGHOST = "localhost:25376";
$PGDATABASE = "Pipeline";
$PGUSER = "postgres";
$PGPASSWORD = "Casa2009";
$PGPORT = 5432;
$db_handle = pg_connect("dbname=$PGDATABASE user=$PGUSER password=$PGPASSWORD");

// Code to pull data from the database and load onto the form  
$pipeno = pg_escape_string($_POST['pipeno']);
$query = "SELECT * FROM fieldtally1 WHERE pipeno = $pipeno ";
$result = pg_query($db_handle,$query); 
$row = pg_fetch_row($result);
$row_info = array('heatno1'=>$row[1],'pipeno2'=>$row[2],'heatno2'=>$row[3],'jointno'=>$row[4]);
$row_info = json_encode($row_info);
print_r($row_info); 
?>

Here are the issues-

1 - Move all <?php ?> scripts to the top of the page. This will: (1) clean up your code, (2) be able to process all database queries at the same time.

2 - Your query to update fieldtally1 is now done before you get your dropdowns from the database.

3 - To fix your second issue after entering data into the input fields and click submit. it creates a new record in the database instead of populating the required columns in the database use INSERT INTO ... VALUES ... ON DUPLICATE KEY UPDATE .... If pipeno is already in the database (since it is a Primary Key) it will UPDATE instead of INSERT.

4 - I recommend saving your error or success message (#4a) and echo it at the top of your html (#4b).

5a - You changed from a hard coded pipeno dropdown, back to the dynamically dropdown using the function. So you are missing the javascript - onChange=check(); 5b - now that you are creating your pipeno & onChange=check(); dynamically, you have to change your check() function to get the id dynamically as well.

6 - $PHP_SELF is not valid. I think you were trying for $_SERVER['PHP_SELF'], but this is easily hacked, so it is better just to use action="". [6.1,6.2,6.3]

7 - When doing your <select><option> you were using the same value="", but each one needs to be different for you to get the value when posting. Also, most </option>'s were misspelled as </optio>. [7.1,7.2,7.3]

8 - If you have 3 forms on the same page, each one has to have a different name, or you will not be able to tell which submit button was clicked. [8.1,8.2,8.3]

9 - Your first two forms were missing closing tags - </td></tr></table></form>. [9.1, 9.2]

10 - In you 2 & 3 forms, you are using id's that are used in the 1st form. This is invalid as every id must be unique. [10.1,10.2]

11 - 3rd form uses id="wallthickness" that was used in form 2. see above about id uniqueness.

回答2:

If the data you want to populate the text field(s) is an attribute of your select option, I'd use jquery. Pull the selected options attributes you want to use, you can then output that to your text box with jquery also. It can be triggered by the change event on the select menue. For example..

$('#selectid').change(function() {
    var opt = $('#selectid option:selected');
    $('#text1id').val(opt.attr('attrfortext1'));
    $('#text2id').val(opt.attr('attrfortext2'));
    $('#text3id').val(opt.attr('attrfortext3'));
});

I'd argue to use Ajax to access another PHP file to parse your database and return a json encoded array with the data you want to populate the text fields with. Depending on how much data your sifting through, your method could ugly quickly if there were several attributes per option with 100's of options.

Craig