Question

我正在尝试将一个变量从javascript函数传递给我的php文件。我所做的就是从javascript中的cookie中提取user_name然后使用AJAX将$ _POST变量添加到我的php文件中进行处理。我没有使用表单来提交我过去做过的POST变量。

问题是我的$ _POST数组没有传递给php文件。我看了看这里，看了几个其他的建议，但都没有用。你必须通过html表单提交$ _POST变量吗？我不这么认为，但也许我错了。这是代码：

Javascript -

function clearDoneItems()  {
var user_name = getNameFromCookie();

if (window.XMLHttpRequest)   {
   // code for IE7+, Firefox, Chrome, Opera, Safari
   xmlhttp=new XMLHttpRequest();
 } 
else {
    // code for IE6, IE5
   xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
 } 

alert(user_name);
xmlhttp.open("POST","todolist/clear_done_items.php",true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
xmlhttp.send(user_name);
displayHomeInformation(user_name);

}

PHP -

<!DOCTYPE html>
<html>

<head>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
<title>Clear Done Items</title>
</head>

<body>
<?php

ini_set('display_errors',1); 
error_reporting(E_ALL);
print_r($_POST);

  $xml_name=$_POST['user_name'];  
  $xml_file = $xml_name . ".xml";
  echo $xml_file;    
    /* Here we will use the The DOMDocument class functions to delete 
       the text nodes.    
       Format XML to save indented tree rather than one line */
$domxml = new DOMDocument('1.0');

if ($domxml->load('$xml_file') === TRUE) {
$domxml->preserveWhiteSpace = false;
$domxml->formatOutput = true;

// Start Delete process of node
echo "<br>";

$xpath = new DOMXPath($domxml);
// Here we use the The DOMXPath class function evaluate to do the heavy lifting.

foreach ($xpath->evaluate('//doneitems/item') as $node) {
  $node->parentNode->removeChild($node);
}

//Save XML to file - remove this and following line if save not desired
$domxml->save('alan.xml');
echo "<strong>XML Document updated.</strong>";
 }

else {
echo "  <strong>Error in loading XML file:</strong>"; 
 echo "<br>";
 print_r(error_get_last());     
}

?>

</body>

</html>

php页面上的错误：注意：未定义的索引：第16行的/var/www/bb/todolist/clear_done_items.php中的user_name 0 警告：DOMDocument :: load（）：I / O警告：无法加载外部实体＆＃34; / var / www / bb / todolist / $ xml_file＆＃34;在第24行的/var/www/bb/todolist/clear_done_items.php

Answer 1

很抱歉延迟回复。我只是想发布我如何解决问题。我将不得不重新使用带有AJAX的$ _POST数组，因为我永远无法通过它传递变量。

使用Javascript：

// Clear Done Items Function
function clear_done_items()
{
var xmlhttp;

var temp = document.getElementById("list_section");
var temp_list_name = temp.innerHTML;
var str_len = temp_list_name.length;
var list_name = temp_list_name.slice(17,str_len);
var user_name = getNameFromCookie();

if (user_name == list_name) {
  if (window.XMLHttpRequest) {
    // code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
   }
  else {
    // code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }

xmlhttp.open("POST","todolist/clear_done_items.php",true);
xmlhttp.send();

} else {
   alert("Warning: You Must be Logged in as this User, " + list_name + ", to Delete the Completed Items List");
  }

}

和php：

<?php
$xml_cookie = $_COOKIE['user'];

$xml_file_name = $xml_cookie . ".xml";

    /* Here we will use the The DOMDocument class functions to delete
       the text nodes.*/

     //Format XML to save indented tree rather than one line
$domxml = new DOMDocument('1.0');

if ($domxml->load($xml_file_name) === TRUE) {
$domxml->preserveWhiteSpace = false;
$domxml->formatOutput = true;

// Start Delete process of node
echo "<br>";

$xpath = new DOMXPath($domxml);
// Here we use the The DOMXPath class function evaluate to do the heavy lifting.

foreach ($xpath->evaluate('//doneitems/item') as $node) {
  $node->parentNode->removeChild($node);
}

//Save XML to file - remove this and following line if save not desired
$domxml->save($xml_file_name);
echo "<strong>XML Document updated.</strong>";
 }

else {
echo "  <strong>Error in loading XML file:</strong>";
 echo "<br>";
 print_r(error_get_last());

}

?>

所以基本上我使用cookie来获取php的user_name变量来从主页面进行处理。

使用$ _POST从javascript传递变量

1 个答案: