如何解决此未定义的索引错误? jQuery Ajax转PHP [英] How can I fix this undefined index error? Jquery Ajax to PHP

问题描述

我正在使用Jquery，Ajax和PHP尝试发送要写入mysql数据库的变量. 正在发出Ajax请求，但是php并未选择该变量.我不知道为什么会这样.

I'm using Jquery, Ajax and PHP to try and send a variable to be written in a mysql database. The Ajax request is being made but the variable is not being picked up by the php. I don't know why this is the case.

使用firebug和console.log()，我可以看到对write_results.php进行了POST

Using firebug and console.log() I can see that a POST has been made to write_results.php

如果我查看回复"，则显示为

If I check the Response it says

通知:未定义索引: 2

这是我的PHP

<?php 
  $testscore=$_POST['testscore'];  //get testscore from Ajax 
  include 'DB.php';
  $con = mysql_connect($host,$user,$pass);
  $dbs = mysql_select_db($databaseName, $con); 
     if (isset($_POST['testscore'])) {  
       $addClient  = "INSERT INTO variables (`id` ,`name`) VALUES (NULL,'$testscore')";  
       mysql_query($addClient) or die(mysql_error());  
       }

?>  

这是我的Ajax脚本

<script type="text/javascript">
$(document).ready(function() {  
testscore ="tryagain"; //testvalue to enter into the mysql database
  $.ajax({  
    type: "POST",  
    url: "write_results.php",  
    data: testscore,      
    success: function(){  
      $('#box2').html("success");
    } 
  })
}); 
</script>

我的问题

1. 为什么$ testscore不能从ajax脚本中接收值?
2. 我该如何解决?

推荐答案

您没有告诉JS如何发送POST参数.将您的JS更改为:

You're not telling the JS how to send your POST parameters. Change your JS to:

data: { 'testscore':testscore },

这等效于key=value形式的"testscore=" + testcore.它告诉JS和PHP您想将变量testscore映射到键"testscore"，然后将其用$_POST['testscore']

This is the equivalent of "testscore=" + testcore in key=value form. It tells JS and PHP that you want the variable testscore to be mapped to the key "testscore", which you'll then pick up with $_POST['testscore']

编辑:请参见 http://api.jquery.com/jQuery .ajax/，将数据发送到服务器"

See http://api.jquery.com/jQuery.ajax/, "Sending Data to the Server"

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