Need help passing variable from php to javascript

I have a problem I've been trying to work through, to which I think there is a probably a simple solution I am missing. I am trying to pass a variable from php to javascript. Seems like it should be easy. The php variable will echo all I want it to; it will echo to the php file where the code is written, and it will echo into the jquery window where my results are listed (from a google books search). But the value of the variable will not propagate to a javascript variable.

Right now I am just trying to pass the value of $book_title to the javascript variable title. I have been placing $book_title in different places hoping it will work. Please note that book-meta.php is the file I am using to pass variables from javascript to php, which is working just fine. Thanks for any help you can give me.

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<?php

/* 

        Plugin Name: Book Search Using Google API

        Plugin URI: http://whosgotbooks.com/wp-content/plugins

        Description: A plugin to get book information and display it in the bbpress topic meta. Find a book by entering the title.

        Version: 1.0.0

        Author: Jerry Caldwell

        Author URI: http://whosgotbooks.com

        License: Open Source 

          */ 

  //turn on full error reports for development purposes - should be turned off for production environment

//error_reporting(E_ALL);

  // shortcode for use in posts/pages

//function book_search_google_shortcode() {                  

//  book_search_google(); }

//  add_shortcode( 'book-search-google', 'book_search_google_shortcode' );

global $book_title;
 
function book_search_google () {    

  //set API version for Google Book Search API

  $v = isset($_POST['v']) ? $_POST['v'] : '1';

  //set user API key for Google Book Search API

  $key = isset($_POST['key']) ? $_POST['key'] : '';

  //set user IP for Google Book Search API

  //$ip = isset($_POST['ip']) ? $_POST['ip'] : $_SERVER['REMOTE_ADDR'];

  //set default value for query to Google Book Search API 0307387941

  $query = isset($_POST['q']) ? $_POST['q'] : '0307387941';

  //set default value for search type to Google Book Search API

  $type = isset($_POST['type']) ? $_POST['type'] : 'all';

  //check and assign page of search results - are we on the first page?

  $start = isset($_POST['start']) ? $_POST['start'] : 1;

  //set default value for number of results

  $limit = isset($_POST['limit']) ? $_POST['limit'] : '10';
 
  switch ($type) {
 
    case 'all':

      $params = 'q='.urlencode($query).'&startIndex='.$start.'&maxResults='.$limit;

    break;
 
    case 'isbn':

            $params = 'q=isbn:'.urlencode($query).'';

    break;
 
    case 'lccn':

            $params ='q=lccn:'.urlencode($query).'';

    break;
 
    case 'oclc':

            $params = 'q=oclc:'.urlencode($query).'';

    break;
 
    default:

      echo '<p>You must specify a search type such as "all" or "book". Check the url to make sure "type=" has a value.</p>';

      exit;

      }

  //set URL for the Google Book Search API

  $url = 'https://www.googleapis.com/books/v'.$v.'/volumes?key='.$key.'&'.$params.''; 
 
  if(isset($_POST['q'])):

  //build request and send to Google Ajax Search API

  $request = file_get_contents($url);

  //decode json object(s) out of response from Google Ajax Search API

  $data = json_decode($request,true);

  $totalItems = $data['totalItems']; 
 
  //Notes for changing popup header background color, title font, etc:

  //header background in "jquery-ui-1.10.4.custom.css", line 813 - also for header font

  //UI button is from line 196 to line 299, and line 827 to 841 - I think

  //on line 803 added a red border around the total popup window

  //make sure some results were returned, show results as html with result numbering and pagination  mainHeading

    if ($totalItems > 0) {  ?>

      <!doctype html>

      <html lang="en">

      <head>

      <meta charset="utf-8">

      <title>jQuery UI Dialog - Default functionality</title>

      <link rel="stylesheet" href="//whosgotbooks.com/jquery/jquery-ui-1.10.4.custom.css">

      <script src="//whosgotbooks.com/jquery/jquery-1.10.2.js"></script>

      <script src="//whosgotbooks.com/jquery/jquery-ui-1.10.4.custom.js"></script>

      </head>

      <body>

      <div id="dialog" title="Google Books Search Results" style="display:none;">

      <?php   

              $book_title = $item['volumeInfo']['title'];

      /* if(isset($_POST['book_title']))

        {

          $book_title = $_POST['book_title'];

         //loop through dataset in you case

          for($i=1;$i<=10;$i++)

          {

                echo "Result Set $i<input type='submit' class='btn' value='Select'  id='select_$i'/><br/>";

          }

        } */ ?>

        <script>

      $(function() {

      $( "#dialog" ).dialog({

        height: 550, width: 450});

        $( ".btn" ).click(function(){

        //assign values to each variable from results on the server

        var title = <?php echo json_encode($book_title) ?>;

        var author = "<?php echo json_encode($book_author); ?>";

        var published = $("#returnvalues").val();

        var description = $("#returnvalues").val();

        var pages = $("#returnvalues").val();

        var publisher = $("#returnvalues").val();

        var ISBN = $("#returnvalues").val();

       //book_title = $item['volumeInfo']['title'];

       $.ajax({

         type: "POST",

         url: '/wp-content/plugins/book-search-google/book-meta.php',

         async:false,

         dataType: 'json',

         //assign values to the variables to be passed to the server via data

         data: { title : title, author : author, published : published, 

         description : description, pages : pages, publisher : publisher, ISBN : ISBN},

         success: function(data)

             {

             //alert(data);

             alert(title);

             //identify the variables for unique handing on the server side

             $("input[name='bbp_topic_title']").val(data.title);

             $("input[name='bbp_extra_field1']").val(data.author);

             $("input[name='bbp_extra_field2']").val(data.published);

             $("input[name='bbp_extra_field3']").val(data.description);

             $("input[name='bbp_extra_field4']").val(data.pages);

             $("input[name='bbp_extra_field5']").val(data.publisher);

             $("input[name='bbp_extra_field6']").val(data.ISBN);

             //$("#displayResults").html(data);

             },

             error: function(errorThrown){

             alert('error');

             }

             });

      $( "#dialog" ).dialog( "close" );  

      });

      });

      </script>  

            <strong><p style="font-size: 16px; text-align: center";>Top 10 Results for &quot;<?php echo @$_POST['q']; ?>&quot;</p></strong>    

        <strong><p style="font-size: 14px; text-align: center";>choose a book to select as your topic</p></strong>&nbsp;

        <table style="width:400px">

        <col width="325">

        <col width="75">

            <?php $i=0; foreach ($data['items'] as $item) { $i++; ?>     

                  <tr>

            <td>

                       <strong><u><div style="font-size: 14px";><?php printf($item['volumeInfo']['title'])?></u></div></strong>

                         <strong>Author: </strong><?php printf( $item['volumeInfo']['authors'][0])?><br />

                         <strong>Published: </strong><?php printf( $item['volumeInfo']['publishedDate']); ?><br />                         

               <strong>Page(s): </strong><?php printf( $item['volumeInfo']['pageCount']); ?><br />

                         <strong>Publisher: </strong><?php printf( $item['volumeInfo']['publisher']); ?><br />

                         <strong>Category: </strong><?php printf( strtolower($item['volumeInfo']['printType']).', '.strtolower($item['volumeInfo']['categories'][0])); ?>&nbsp;&nbsp;

               <strong>ISBN: </strong><?php printf( $item['volumeInfo']['industryIdentifiers'][0]['identifier']); ?></td>

            <td><p><input type="submit" method="post" name="selectbook" value="Select" class="btn" id="returnvalues" /></p>

            <img src="<?php printf( rawurldecode($item['volumeInfo']['imageLinks']['smallThumbnail'])); ?>" />

                    </td>

            <tr><td style="width:420px"><p><strong>Description: </strong><?php printf( $item['volumeInfo']['description']); ?><br /></p></td>

            <?php

              //$book_title = $item['volumeInfo']['title'];      

             ?>

<script>

var title = <?php echo json_encode($book_title); ?>;

</script>       

            </tr>

            </tr>

                <?php } }

            else {

                ?>

                   <p><strong>Sorry, there were no results</strong></p>

                <?php  }         ?>

        </table>

      </div>

      </body>

      </html>

          <?php

          else: //show form and allow the user to check for Google Book search results

          ?>
 
      <p><form id="searchForm" name="searchForm" method="post"> 

        <fieldset id="searchBox">

            <label>Search for a Book:</label>

            <input class="text" id="q" name="q" type="text" value="Powered by Google" onfocus="this.value=''; this.onfocus=null;" />

            <select id="type" name="type" size="1">

                <option selected value="all">Book Title</option>

                <option value="isbn">Books by ISBN</option>

                <option value="lccn">Books by LCCN #</option>

                <option value="oclc">Books by OCLC #</option>                

            </select>

            <input class="submit" id="searchForm" name="submit" type="submit" value="Search"  />

        </fieldset>

      </form></p>

      <?php

      //end submit isset if statement on line 73

      endif;
 
      echo $book_title;

//}                   

}

May 16 '14 #1

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1864

jerrysc

I figured this out! Anyone who is curious, I placed the javascript variable in a different script, which resides within the loop where the php results are displayed.

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<script>

var title = <?php echo json_encode($book_title); ?>;

</script>

I have also edited my answer above to show specifically where I placed this.

May 16 '14 #2

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Need help passing variable from php to javascript

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