Passing a value from a textbox to a child pop-up window

Any chance we can get a single script with a complete example that we can copy and install on our servers?
http://sscce.org/

You may need to use 'innerHTML' instead of 'value'.

var passVariable= document.getElementById("myhtml").innerHTML;

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Here you go. The textbox id "myhtml" contains html coding that I wish t render in the child pop-up page so they can see the results of what they entered..
saveoff.php is the parent page - coding listed below.
 preview.html is the child page (listed below saveoffer.php coding)

saveoffer.php

 <?php 
    require_once ("Includes/dbconfig.php");
    include("Includes/session.php");

   // Create database connection
    
      $databaseConnection = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
   
      if ($databaseConnection->connect_error)
   
        {
     
               die("Database selection failed: " . $databaseConnection->connect_error);
  
        }
   
    $baderr= "";
// check button action section

// user has click preview button
 if (isset($_POST['preview']))
   { 
     //  header ("Location:saveoffer.php");
   }

// user has click clear button
 if (isset($_POST['clear']))
   { 
       header ("Location:saveoffer.php");
   }

// user has click on cancel button
    if (isset($_POST['cancel']))
   { 
       header ("Location:menu.php");
   }
// user has click on main menu button
if (isset($_POST['main']))
  
    {
     header ("Location:menu.php");
    }

// user has click on the save button
if (isset($_POST['submit']))
  
    {
      
        // intialize error message
        $baderr= "";

  // section to pull values from form  
     // country
       $country = $_POST["country"];
       //get stdmarketing value from the lookuptable
       $query = "select StdMarketLabel FROM countries where Country='$country'";
                 $result = $databaseConnection->query($query);
                 while($row = $result->fetch_assoc())
                      {
                         $countrylbl =  $row["StdMarketLabel"];
                      }
       //travel 
       $travel = $_POST["travel"];
       $query = "select StdMarketLabel FROM traveltypes where travel='$travel'";
                 $result = $databaseConnection->query($query);
                 while($row = $result->fetch_assoc())
                      {
                         $travellbl =  $row["StdMarketLabel"];
                      }
  
  
      // pulling html code pasted into textarea
      $rawoffer = $_POST['supoffers'];
      $goodoffer = htmlentities($rawoffer,ENT_QUOTES);

      $supplerid = $_SESSION["SupplierId"];
      $sqlsupplierid = $_SESSION["MsId"];
      $suppliername =  $_SESSION["SupplierName"];
    

      //check to make sure they have chosen atleast one tag
      // start of new coding section
      if (($country == 'None Selected' and $travel == 'None Selected') or ($goodoffer == ''))
         {  
               $baderr = "ERRORS:<BR>YOU MUST SELECT AT ATLEAST ONE TAG FOR SEARCHING.<BR>YOU MUST ENTER HTML CODING.";

         }else{
 // end of new coding section 
            $baderr = "";
            $databaseConnection = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
            if ($databaseConnection->connect_error)
               {
                    die("Database selection failed: " . $databaseConnection->connect_error);
               }else{

               // if they have chosen an option then insert record
                                 
             $sql = "insert into supplierlibrary(RecId,Name,SupplierPk,CountryStdMarket,
                     Country,TravelStdMarket,Travel,CampMsgBody)
                     values($supplerid,'$suppliername', $sqlsupplierid,'$countrylbl','$country','$travellbl','$travel','$goodoffer')";
                                        
               $res= $databaseConnection->query($sql);

               if (!$res)
                  {
                      $baderr = "ERROR<BR>FAILED TO INSERT RECORD<br>ERROR CODE:".$sql ."<BR><BR>" .$databaseConnection->error;
                      echo "<h7 style='color:#e80c4d;'>$baderr</h7>";
                     // echo "ERROR FAILED TO INSERT RECORD";
                     // echo "<BR><BR>";
                     // echo "ERROR<BR>" .$sql ."<BR><BR>" .$databaseConnection->error;
                      // allowed back into coding
                  }else{
                      $baderr = "RECORD WAS SAVED SUCCESSFULLY";
                      echo "<h7 style='color:'red';alignment-adjust: 'middle'>$baderr</h7>";
                      // moved here on 07-03
                      header ("Location:saveoffer.php");
                   }
              
                mysqli_close($databaseConnection);
                $baderr = "";
            }
           } 
              
    } else {
           // $baderr = "Username/password combination is incorrect. Please try again";
          
    }
?>


<script type="text/javascript" language="javascript">
    var passVariable;
    function mkPreview() {
        var passVariable = document.getElementById("myhtml").value;
       // document.write(passVariable); ///this writes on parent page - saveoffer.php...but need it to do it on child page - preview page
        window.open('preview.html', 'Preview', 'width=600, height=600,left=70, top=70 scrollbars=yes resizable=yes menubar=no');
    }

</script>
  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
    
   <head>
     <title>Supplier Save Offer to Library</title>
     <link href="Styles/StyleSheet.css" rel="stylesheet" type="text/css" /> 
    </head>
     
    <body class="bodybg">
<form action="saveoffer.php" method="post">
    <br><br>
        <table align="center">
           <tr><td>Select any of the following tags to be for searching later.<br>You MUST choose atleast one.</br:>:</td></tr>
            <tr><td colspan="2">  <?php 
                       if (isset($_POST['submit']))
                       {
                          echo "<h7 style='color:#e80c4d;'>$baderr</h7>";
                       } ?>
             </td></tr>
            <tr><td align="right">Country:</td>
                <td align="left">
                <select name="country">
                <option value="None Selected" selected>Choose One</option>
        
                      <?php
                         $query = "select * FROM countries order by Country";
                         $result = $databaseConnection->query($query);
                         while($row = $result->fetch_assoc())
                              {
                                    ?><option value="<?php echo $row["Country"];?>"><?php echo $row["Country"];?></option>
                              <?php  }  ?>
                 </select>
                 </td>                                
                 <td align="right">Travel Type:</td>
                 <td align="left">
                 <select name="travel">
                <option value="None Selected" selected>Choose One</option>
        
                      <?php
                         $query = "SELECT * FROM traveltypes order by Travel";
                         $result = $databaseConnection->query($query);
                         while($row = $result->fetch_assoc())
                              {
                              ?>
                              <option value="<?php echo $row["Travel"];?>"><?php echo $row["Travel"];?></option>

                             <?php  }  ?>
                               </select>
             </td></tr>
            
        </table>
        <br><br>
             <table align="center">
            <tr><td>Paste HTML Code in textbox below</td></tr></table>

            <table align="center">
            <tr><td align="center">
                <input type="submit" name="submit" value="Save" src="images/Save.jpg"/></td>
                <td align="center"><input type="submit" name="cancel" value="Cancel" src="images/Cancel.jpg"/></td>
                <td align="center"><input type="submit" name="clear" value="Clear Form" src="images/Clear.jpg"/></td>
                <td align="center"><input  type="button" value="Preview Offer" onclick="javascript:mkPreview();" src="images/PreviewOffer.jpg"/></td>
                <td align="center"> <input type="submit" name="main" value="Main Menu" src="images/MainMenu.jpg"/></td>
                </td>
            </tr></table>
    <br>
       <table  align="center">
            <tr><td><textarea id="myhtml" name="supoffers" cols="80" rows="20"></textarea></td></tr>
        </table>

    </form>
    </body>
</html>

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Preview.html

<script>
    document.write(opener.passVariable);


</script>

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You could try appending the desired value to the html page.  So update the code as follows:
window.open('preview.html?data='+encodeURIComponent(passVariable), 'Preview', 'width=600, height=600,left=70, top=70 scrollbars=yes resizable=yes menubar=no');

Then on preview.html, try:

<script type="text/javascript">
    function gup( name,context )
{
 if(!context)
  context=window.location.href;
  name = name.replace(/[\[]/,"\\\[").replace(/[\]]/,"\\\]");
  var regexS = "(^|[\\?]|&(amp;)?)"+name+"=([^&#]*)";
  var regex = new RegExp( regexS,"" );
  var results = regex.exec( context );
  if( results == null )
    return "";
  else
    return decodeURIComponent(results[3]);
}

var data = gup('data', location.href);
alert( data );
</script>

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I see what you are saying about innerHTML but I displayed the passVariable on the parent page - saveoffers - and it had what I had pasted into the textbox so it is getting the value. But if it is in keeping with good coding practice, I will change it.

>>I see what you are saying about innerHTML
 You are working with a textarea, so what you had initially is fine (meaning using the "value" instead of "innerHTML".  You would need the "innerHTML" if the element in question was not a form element (like a <div> or <p>).

I understand. I don't think sending the value of the textfield as part of the url string would be a good idea simply because it will contain html code and mostly because it could be very large. The whole purpose of the child page is to render the coding as if it was a web page. Any more thoughts anyone?

I understand, sometimes its hard to verbalize in written form what one is trying to communicate.  I never knew that about forms. Interesting.
 Question, in referencing the forms[0], can the name of the actual page be a substitute for forms[0] as in the example below? I am going to give the code a try. More later and thank you.

document.write( window.opener.document.savoffer.php.supoffers.value );

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>> can the name of the actual page be a substitute for forms[0]
No.  The name of the file has no bearing in the DOM tree.  If you don't know anything about DOM, do yourself a favor and read up on it.  There should be plenty of articles out there on the subject.  IMHO, understanding the DOM is essential to front end web development.

Given:
<form name="myForm" id="f1" method="post" action="#">
<table  align="center">
            <tr><td><textarea id="myhtml" name="supoffers" cols="80" rows="20"></textarea></td></tr>
        </table>
</form>

from the popup you could retrieve the value of supoffers by using the form's:
- id:
window.opener.document.forms["f1"].supoffers.value OR
window.opener.document.getElementById("f1").supoffers.value

- name:
window.opener.document.myForm.supoffers.value OR
window.opener.document.forms["myForm"].supoffers.value OR
window.opener.document.getElementsByName("myForm")[0].supoffers.value

- index position of the form in the document as previously mentioned:
window.opener.document.forms[0].supoffers.value;

If you have multiple fields, you can first store a reference to the form onto a variable and use that as a "shortcut" to dereference the fields - ex:

var the_form = window.opener.forms["f1"];

// assuming you also have <input name="firstName"/><input name="lastName"/> in the <form>
document.write( the_form.firstName.value);
document.write( the_form.lastName.value);
document.write( the_form.supoffers.value);

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Thank you very much and yes, I need to have a better understanding of DOM. Your suggestion worked well, solved the problem. And I thank you for taking the extra time to further explain. I would also like to thank everyone who contributed.

Thanks again. and thank you to everyone who responded.