级联下拉菜单的jQuery阿贾克斯PHP [英] cascading dropdown jquery ajax php

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问题描述

我有以下的code,以产生一个级联下拉,但由于某些原因,阿贾克斯后不能正常工作。我可以得到它来填充状态列表,当我选择我的状态提醒,告诉我这是正确的数值,但是,当谈到时间张贴到fetch_state.php似乎张贴空。是否有人可以帮助我,为什么它这样做?

下面是低于

在code

的index.php

 < PHP
    使用error_reporting(E_ALL);
    ini_set('的display_errors',1);
包括(connection.php);
?>
<!DOCTYPE HTML>
< HTML>
< HEAD>
<链接相对=样式表的href =style.css文件类型=文本/ CSS/>

< /头>
<身体GT;
< D​​IV ID =容器>
  < D​​IV ID =体与GT;
    < D​​IV ID =下拉菜单>
       < D​​IV ID =中心类=级联>
          < PHP
        $ SQL =SELECT DISTINCT状态从tbl_zip ORDER BY状态ASC;
        $查询= mysqli_query($ CON,$ SQL);
        ?>
            <标签>状态:
            <选择名称=状态ID =状态>
              <期权价值=>请选择< /选项>
              <?PHP而($ RS = mysqli_fetch_array($查询,MYSQLI_ASSOC)){>
              <期权价值=< PHP的echo $ RS [状态];>中>< PHP的echo $ RS [状态]; ?>< /选项>
              < PHP}&GT?;
            < /选择>
            < /标签>
          < / DIV>


          < D​​IV ID =城级=级联>< / DIV>
          < D​​IV ID =拉链级=级联>< / DIV>
        < / DIV>
    < / DIV>
  < / DIV>
&所述;脚本的src =htt​​p://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js>&所述; /脚本>
<脚本>
$(文件)。就绪(函数(){
$(#选择状态)。改变(函数(){

    VAR状态= $(#选择状态选项:选择)ATTR('值');。
    警报(州);
    $(#城)HTML()。
    $(#拉链)HTML()。
    如果(state.length大于0){
        警报(state.length);
     $阿贾克斯({
            键入:POST,
            网址:fetch_state.php
            数据:状态=+状态,
            缓存:假的,
            beforeSend:函数(){
                $('#城市)HTML('< IMG SRC =loader.gifALT =宽度=24高度=24>');
            },
            成功:函数(HTML){
                $(#城)HTML(HTML)。
            }
        });
    }
});
});
< / SCRIPT>
< /身体GT;
< / HTML>
 

fetch_state.php

 < PHP

包括(connection.php);
后续代码var_dump($ _ POST);
$状态=修剪(函数mysql_escape_string($ _ POST [国家]));

$ SQL =SELECT DISTINCT市领tbl_zip WHERE状态=$状态ORDER BY城市。
$数= mysqli_num_rows(mysqli_query($ CON,$ SQL));
如果($计数大于0){
$查询= mysqli_query($ CON,$ SQL);
?>
<标签>城市:
<选择名称=城市ID =drop2>
    <期权价值=>请选择< /选项>
    <?PHP而($ RS = mysqli_fetch_array($查询,MYSQLI_ASSOC)){>
    <期权价值=< PHP的echo $ RS [城市];>中>< PHP的echo $ RS [城市]。 ?>< /选项>
    < PHP}&GT?;
< /选择>
< /标签>
< PHP
    }

?>

&所述;脚本的src =htt​​p://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js>&所述; /脚本>
<脚本>
$(文件)。就绪(函数(){
$(#选择drop2)。改变(函数(){

    VAR STATE_ID = $(#选择选项drop2:选择)。ATTR('值');
   //警报(STATE_ID);
    如果(state_id.length大于0){
     $阿贾克斯({
            键入:POST,
            网址:fetch_city.php
            数据:城市=+城市,
            缓存:假的,
            beforeSend:函数(){
                $('#城市)HTML('< IMG SRC =loader.gifALT =宽度=24高度=24>');
            },
            成功:函数(HTML){
                $(#城)HTML(HTML)。
            }
        });
    } 其他 {
        $(#城)HTML()。
    }
});

});
< / SCRIPT>
 

错误我不断收到

 警告:mysqli_num_rows()预计参数1被mysqli_result,布尔
 

解决方案

首先,改变你的函数mysql_escape_string mysqli_escape_string

  $状态=修剪(mysqli_escape_string($ CON,$ _ POST [国家]));
 

和再包装你的引号中的状态

  $ SQL =SELECT DISTINCT市领tbl_zip WHERE状态='$状态。'ORDER BY城市;
 

另外,拿<脚本> 阻挡 fetch_state.php 的,只是有它在的index.php 与其他<脚本>

I have the following code in order to generate a cascading dropdown but for some reason the ajax post is not working. I can get it to populate the state list and when i choose a state i alert to show me the value which is correct, but when it comes time to post to fetch_state.php it seems to post null. Can someone please help me on why its doing that?

Here is the code below

index.php

<?php
    error_reporting(E_ALL);
    ini_set('display_errors', 1);
include("connection.php");
?>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css" type="text/css" />

</head>
<body>
<div id="container">
  <div id="body">
    <div id="dropdowns">
       <div id="center" class="cascade">
          <?php
        $sql = "SELECT DISTINCT state FROM tbl_zip ORDER BY state ASC";
        $query = mysqli_query($con, $sql);
        ?>
            <label>State:
            <select name="state" id = "state">
              <option value="">Please Select</option>
              <?php while ($rs = mysqli_fetch_array($query, MYSQLI_ASSOC )) { ?>
              <option value="<?php echo $rs["state"]; ?>"><?php echo $rs["state"]; ?></option>
              <?php } ?>
            </select>
            </label>
          </div>


          <div id="city" class="cascade"></div>
          <div id="zip" class="cascade"></div>        
        </div>
    </div>
  </div>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("select#state").change(function(){

    var state =  $("select#state option:selected").attr('value'); 
    alert(state);   
    $("#city").html( "" );
    $("#zip").html( "" );
    if (state.length > 0 ) { 
        alert(state.length);
     $.ajax({
            type: "POST",
            url: "fetch_state.php",
            data: "state="+state,
            cache: false,
            beforeSend: function () { 
                $('#city').html('<img src="loader.gif" alt="" width="24" height="24">');
            },
            success: function(html) {    
                $("#city").html( html );
            }
        });
    } 
});
});
</script>
</body>
</html>

fetch_state.php

<?php

include("connection.php");
var_dump($_POST);
$state = trim(mysql_escape_string($_POST["state"]));

$sql = "SELECT DISTINCT city FROM tbl_zip WHERE state = ".$state ." ORDER BY city";
$count = mysqli_num_rows( mysqli_query($con, $sql) );
if ($count > 0 ) {
$query = mysqli_query($con, $sql);
?>
<label>City: 
<select name="city" id="drop2">
    <option value="">Please Select</option>
    <?php while ($rs = mysqli_fetch_array($query, MYSQLI_ASSOC)) { ?>
    <option value="<?php echo $rs["city"]; ?>"><?php echo $rs["city"]; ?></option>
    <?php } ?>
</select>
</label>
<?php 
    }

?>

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("select#drop2").change(function(){

    var state_id = $("select#drop2 option:selected").attr('value');
   // alert(state_id);
    if (state_id.length > 0 ) { 
     $.ajax({
            type: "POST",
            url: "fetch_city.php",
            data: "city="+city,
            cache: false,
            beforeSend: function () { 
                $('#city').html('<img src="loader.gif" alt="" width="24" height="24">');
            },
            success: function(html) {    
                $("#city").html( html );
            }
        });
    } else {
        $("#city").html( "" );
    }
});

});
</script>

Error i keep receiving

Warning: mysqli_num_rows() expects parameter 1 to be mysqli_result, boolean 

解决方案

first, change your mysql_escape_string to mysqli_escape_string

$state = trim(mysqli_escape_string($con, $_POST["state"]));

and then wrap your state in quotes

$sql = "SELECT DISTINCT city FROM tbl_zip WHERE state = '".$state ."' ORDER BY city";

also, take the <script> block out of fetch_state.php and just have it in index.php with the other <script> block

这篇关于级联下拉菜单的jQuery阿贾克斯PHP的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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