我知道php在服务器上，而javascript在客户端上。我学会了如何将变量从服务器传递到客户端，然后再传递回服务器。我现在遇到的问题特别令人沮丧。我试图从javascript传递变量。这个特殊变量是计数的结果。这是一个编辑 - 我相信我已经将我的问题缩小到了javascript部分和php文件。
仅供参考：这是做什么的;用户在搜索窗口中输入书名，谷歌api用于在jquery窗口中返回结果。然后，用户将选择他/她想要的书，并且该数据将自动填充一些窗口。我在那里95％ - 只需要获得用户选择的特定行。
<script>
//var bookSelect;
$(function() {
$( "#dialog" ).dialog({
height: 550, width: 450});
$( ".submit" ).click(function(){
if(this.id.indexOf('select')>-1) { var id = (this.id.split("_"))[1]; console.log(id); }
bookSelect = id;
//$("#select").val(bookSelect);
$.ajax({
type: "POST",
url: 'book-meta.php',
async:true,
dataType: 'json',
//assign values to the variables to be passed to the server via data
data: { cover : cover, title : title, author : author, published : published, ISBN : ISBN,
description : description, pages : pages, publisher : publisher, 'bookSelect' : bookSelect},
success: function(data)
{
//identify the variables for unique handing on the server side, this is
//how javascript variables (client side) are passed to the server
$("input[name='bbp_extra_fieldc']").val(data.cover);
$("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);
$("input[name='bbp_extra_field6']").val(data.ISBN);
//$("input[name='bbp_extra_fieldi']").val(data.bookSelect);
//$('#select').val(data.bookSelect);
//alert(data);
alert(bookSelect);
},
error: function(errorThrown){
alert('error');
}
});
$( "#dialog" ).dialog( "close" );
});
});
</script>
这是book-meta.php代码：
if ( isset( $_POST['bookSelect'] )) {
$int = $_POST['bookSelect'];
//echo $int;
}
if ( isset( $_POST['cover'] )) {
$cover = $_POST['cover'];
}
if ( isset( $_POST['title'] )) {
// echo $_SESSION['book_title'];
// $book_title = $_REQUEST['book_title'];
$title = $_POST['title'];
}
if ( isset( $_POST['author'] )) {
$author = $_POST['author'];
}
if ( isset( $_POST['published'] )) {
$published = $_POST['published'];
}
if ( isset( $_POST['description'] )) {
$description = $_POST['description'];
}
if ( isset( $_POST['pages'] )) {
$pages = $_POST['pages'];
}
if ( isset( $_POST['publisher'] )) {
$publisher = $_POST['publisher'];
}
if ( isset( $_POST['ISBN'] )) {
$ISBN = $_POST['ISBN'];
}
$r=array("cover"=>$cover,"title"=>$title,"author"=>$author,"published"=>$published,"description"=>$description,
"pages"=>$pages,"publisher"=>$publisher,"ISBN"=>$ISBN,"bookSelect"=>$int);
print(json_encode($r));
从javascript传递的变量是bookSelect = id;。我得到了我应该进入警报的值（bookSelect），这是一个数字。我想知道我是否在php文件中处理错误。我是否需要将其声明为整数然后使用print json_encode或其他东西？我已经在这2天了。我很绝望！
以下是jquery窗口的输出：
<strong><p style="font-size: 16px; text-align: center";>Top 10 Results for "<?php echo @$_POST['q']; ?>"</p></strong>
<strong><p style="font-size: 14px; text-align: center";>choose a book to select as your topic</p></strong>
<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']);
$b_title[$i] = $item['volumeInfo']['title']?></u></div></strong>
<strong>Author: </strong><?php printf( $item['volumeInfo']['authors'][0]);
$b_author[$i] = $item['volumeInfo']['authors'][0]?><br />
<strong>Published: </strong><?php printf( $item['volumeInfo']['publishedDate']);
$b_published[$i] = $item['volumeInfo']['publishedDate'] ?><br />
<strong>Page(s): </strong><?php printf( $item['volumeInfo']['pageCount']);
$b_pages[$i] = $item['volumeInfo']['pageCount'] ?><br />
<strong>Publisher: </strong><?php printf( $item['volumeInfo']['publisher']);
$b_publisher[$i] = $item['volumeInfo']['publisher'] ?><br />
<strong>Category: </strong><?php printf( strtolower($item['volumeInfo']['printType']).', '.strtolower($item['volumeInfo']['categories'][0])); ?>
<strong>ISBN: </strong><?php printf( $item['volumeInfo']['industryIdentifiers'][0]['identifier']);
$b_ISBN[$i] = $item['volumeInfo']['industryIdentifiers'][0]['identifier'] ?></td>
<td><p><?php echo "<input type=\"submit\" method=\"post\" name=\"submit\" value=\"Select\" class=\"submit\" id=\"select_$i\" />"; ?></p>
<img src="<?php printf( rawurldecode($item['volumeInfo']['imageLinks']['smallThumbnail']));
$b_cover[$i] = $item['volumeInfo']['imageLinks']['smallThumbnail'] ?>" />
</td>
<tr><td style="width:420px"><p><strong>Description: </strong><?php printf( $item['volumeInfo']['description']);
$b_description[$i] = $item['volumeInfo']['description'] ?><br /></p></td>
</tr>
</tr>
以下是变量声明：
$book_cover = $b_cover[$b];
$book_title = $b_title[$b];
$book_author = $b_author[$b];
$book_published = $b_published[$b];
$book_description = $b_description[$b];
$book_pages = $b_pages[$b];
$book_publisher = $b_publisher[$b];
$book_ISBN = $b_ISBN[$b];
//}
?>
<script>
//assign values to each javascript variable with results on the server
//this is how php variables are passed from server to the client - php to javascript
var cover = <?php echo json_encode($book_cover); ?>;
var title = <?php echo json_encode($book_title); ?>;
var author = <?php echo json_encode($book_author); ?>;
var published = <?php echo json_encode($book_published); ?>;
var description = <?php echo json_encode($book_description); ?>;
var pages = <?php echo json_encode($book_pages); ?>;
var publisher = <?php echo json_encode($book_publisher); ?>;
var ISBN = <?php echo json_encode($book_ISBN); ?>;
</script>