未定义JSON错误请求

JSON error request is not defined

本文关键字：请求 错误 JSON 未定义      更新时间：2023-09-26

当我执行console.log(req.responsetext)时，我得到[11:38:04.967]ReferenceError: req未定义。但我定义的req作为一个新的xml请求在窗口加载，所以我有点难倒。有什么方法可以让我传递一个参考吗?

控制台输出如下

[12:29:06.839] GET getterms.php?query=DFA [HTTP/1.1 200 OK 99ms]
[12:29:06.888] SyntaxError: JSON.parse: unexpected character @ search.php:21
[12:33:24.316] console.log(req.responsetext)
[12:33:24.318] ReferenceError: req is not defined

任何和所有的帮助将是非常感激的。感谢任何花时间阅读和/或回答的人，即使你不能帮助!

    <!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='utf-8'>
    <title>Auto Complete</title>
</head>
<body>
    <script>
        window.onload = function () {
            var req = new XMLHttpRequest();     //the HTTP request which will invoke the query
            var input = document.getElementById('search');      //where to grab the search from
            var output = document.getElementById('results');    //where to display the sugestions
            input.oninput = getSuggestions;
            function getSuggestions() {
                req.onreadystatechange = function () {
                    output.innerHTML = "";  //CLEAR the previous results!! only once the server can process new ones though
                    if (this.readyState == 4 && input.value != "") {
                        var response = JSON.parse(req.responseText);
                        for (var i = 0; i < response.length; i++)
                            addSuggestion(response[i].terms);
                    }
                }               
                req.open('GET', 'getterms.php?query=' + input.value, true); //GET request to getterms.php?=
                req.send(null);
            }
            addSuggestion = function (suggestion) {
                var div = document.createElement('div');
                var p = document.createElement('p');
                div.classList.add('suggestion');        //suggestion[x]...
                p.textContent = suggestion;             
                div.appendChild(p);
                output.appendChild(div);
                div.onclick = function() {
                    input.value = p.innerHTML;  //set the search box
                    getSuggestions();           //GET new suggesions
                }

            }
        }
    </script>
    <input type='text' id='search' name='search' autofocus='autofocus'>
    <div id='results'></div>
</body>
</html>
这是我的PHP页面，响应json. 
<?php
error_reporting(E_ALL);
ini_set('display_errors', 'On');
if (!isset($_GET['query']) || empty($_GET['query']))
    header('HTTP/1.0 400 Bad Request', true, 400);
else {

    $db = new PDO(
    my database
    );

    $search_query = $db->prepare("
        SELECT * FROM `words` WHERE `word` LIKE :keywords LIMIT 5
    ");
    $params = array(
        ':keywords' => $_GET['query'] . '%',
    );
    $search_query->execute($params);
    $results = $search_query->fetchAll(PDO::FETCH_ASSOC);
    echo json_encode($results);
}
?>

范围问题!把req前面的var去掉，使它全局化，它就可以工作了

相关文章：