PHP变量无法使用json_encode()正确返回成功的AJAX/jQuery POST [英] PHP variables not returning to success AJAX/jQuery POST correctly using json_encode()

问题描述

我已经尝试了几个小时才能使它正常工作.我有一个<div id=""data_friends>标记和一个hidden input field我想使用AJAX更新. div标签如下:

I've been trying for hours to get this to work. I have a <div id=""data_friends> tag and a hidden input field that I want to update using AJAX. The divtag is as follows:

<div class="friends-tab-list" id="data_friends">

    <?php 
    //Default query limits results to 8

    $sql = ("SELECT * FROM users WHERE FIND_IN_SET(?, friend_array) > 0 LIMIT 0,8");
    $query = mysqli_prepare($con, $sql);
    $query->bind_param('s', $username);
    $query->execute();

    $result = $query->get_result();

    $num_rows = $result->num_rows;

        while ($row = $result->fetch_assoc()) {
        $row['profile_pic']; 
        $row['username'];

        echo "<a class='profile-img-item' href='" . $row['username'] . "'>
              <img src='" . $row['profile_pic'] . "' title='" . $row['username'] . "'>
              </a>";
                }
        $query->close();

          ?>
</div>

隐藏的输入如下:<input id='max' type='hidden' value='<?php echo $num_rows; ?>'>

我单击查看更多朋友"按钮，并使用以下命令将数据发送到includes/handlers/ajax_load_profile_friends.php:

I'm clicking on a View More Friends button and sending data to includes/handlers/ajax_load_profile_friends.php using the following:

$.ajax({

    url:'includes/handlers/ajax_load_profile_friends.php',
    type:'POST',
    dataType: 'json',
    data:{'username':username, 'num_friends':num_friends, 'counter':counter},

        success: function(data) {
            $('#data_friends').html(data.html);
            $('#max').val(data.num_rows);
                }
        });

来自ajax_load_profile_friends.php的数据如下:

The data coming from ajax_load_profile_friends.php looks like this:

$query = mysqli_prepare($con,"SELECT * FROM users WHERE FIND_IN_SET(?, friend_array) LIMIT $counter"); 
$query->bind_param('s', $username);
$query->execute();

$result = $query->get_result();

$num_rows = $result->num_rows;
}       

while ($row = $result->fetch_assoc()) {
$row['profile_pic']; 
$row['username'];

$html = "<a class='profile-img-item' href='" . $row['username'] . "'>
          <img src='" . $row['profile_pic'] . "' title='" . $row['username'] . "'>
         </a>";

}   

echo json_encode(array('num_rows' => $num_rows, 'html' => $html));

当我运行此函数时，我想通过在成功函数$('#data_friends').html(data.html);
中执行此操作而获得的每一次点击都希望获得16条记录的返回值

When I run this, I get a single return in my when I'm suppose to get a return of 16 records with each click I thought by doing this in my success function $('#data_friends').html(data.html);

隐藏输入字段<input id='max' type='hidden' value='<?php echo $num_rows; ?>'>中的值未使用此$('#max').val(data.num_rows);

The value in my hidden input field <input id='max' type='hidden' value='<?php echo $num_rows; ?>'> is not updating using this $('#max').val(data.num_rows);

ajax_load_profile_friends.php中是否缺少引起这些行为的某些东西?

Is there something I'm missing in ajax_load_profile_friends.php that is causing these behaviors?

**请记住，当我不使用json_encode& ;;编写类似$('#data_friends').html(data.html);这样的成功函数，并从AJAX中删除dataType: 'json',.这里的问题在于，无论哪种方式，我都无法更新隐藏的输入值.我想我会尝试并纠正此方法，因为大多数示例都将json_encode()指定为返回数据的方式.

**Keep in mind that I can get this to work when I don't use json_encode & write success function like this $('#data_friends').html(data.html); and remove the dataType: 'json', from AJAX. The problem here is that in both ways, I'm not able to update my hidden input value. I figured I would try and correct this method since most examples specify json_encode() as the way to return data.

推荐答案

header( "Content-Type: application/json", TRUE );
$query = mysqli_prepare($con,"SELECT * FROM users WHERE FIND_IN_SET(?, friend_array) LIMIT $counter"); 
$query->bind_param('s', $username);
$query->execute();

$result = $query->get_result();

$num_rows = $result->num_rows;

$html='';

while ($row = $result->fetch_assoc()) {


$html .= "<a class='profile-img-item' href='" . $row['username'] . "'>
          <img src='" . $row['profile_pic'] . "' title='" . $row['username'] . "'>
         </a>";

}   

echo json_encode(array('num_rows' => $num_rows, 'html' => $html));

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