如果您倾向于否决此问题，请说明原因，以便我从错误中吸取教训。
PHP - 编辑
<?php
require_once "dbconnect.php";
function isEmpty($str) {
return strlen(trim($str)) == 0;
}
function getWritersData() {
try {
if (!isset($_REQUEST["userid"]) || isEmpty($_REQUEST["userid"])) {
throw new Exception('A user-id must be supplied.');
}
$userid = $_REQUEST["userid"];
$dbh = connect2DB();
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->prepare("SELECT Title, WorkType, FormType, Genre, NumberOfPages, Filename, OriginalFilename FROM Writers WHERE fkAccounts = :userid");
$stmt->bindParam(':userid', $userid, PDO::PARAM_INT);
$stmt->execute();
$rows = $stmt->fetchAll();
echo json_encode($rows, JSON_FORCE_OBJECT);
} catch (PDOException $e) {
echo 'Database error: ' . $e->getMessage();
} catch (Exception $e) {
echo 'General error: ' . $e->getMessage();
}
}
/** Update writers data **/
function saveWritersData()
{
try {
include_once "commonWritersPostElements";
$dbh = connect2DB();
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->prepare("UPDATE Writers SET fkAccounts=:userid, Title=:title, WorkType=:worktype, FormType=:formtype, Genre=:genre, NumberOfPages=:pages, Filename=:filename, OriginalFilename=:origonal WHERE fkAccounts=:userid");
$worktype = "1";
$stmt->bindParam(':userid', $userid, PDO::PARAM_INT, 10);
$stmt->bindParam(':title', $title, PDO::PARAM_STR, 255);
$stmt->bindParam(':worktype', $worktype, PDO::PARAM_STR, 30);
$stmt->bindParam(':formtype', $formtype, PDO::PARAM_STR, 30);
$stmt->bindParam(':genre', $genre, PDO::PARAM_STR, 100);
$stmt->bindParam(':pages', $nbrPages, PDO::PARAM_STR, 100);
$stmt->bindParam(':filename', $NewFileName, PDO::PARAM_STR, 30);
$stmt->bindParam(':original', $File_Name, PDO::PARAM_STR, 30);
$stmt->execute();
} catch (PDOException $e) {
echo 'Database error: ' . $e->getMessage();
} catch (Exception $e) {
echo 'General error: ' . $e->getMessage();
}
}
function deleteWritersData()
{
try {
if (!isset($_REQUEST["userid"]) || isEmpty($_REQUEST["userid"]))
throw new Exception('user-id is missing.');
else {
$userid = filter_var(trim($_REQUEST["user-id"]), FILTER_SANITIZE_STRING);
$userid = htmlspecialchars_decode($userid, ENT_QUOTES);
}
$dbh = connect2DB();
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$stmt = $dbh->prepare("DELETE Writers WHERE fkAccounts=:userid");
$stmt->bindParam(':userid', $userid, PDO::PARAM_INT, 10);
$stmt->execute();
} catch (PDOException $e) {
echo 'Database error: ' . $e->getMessage();
} catch (Exception $e) {
echo 'General error: ' . $e->getMessage();
}
}
if (!isset($_REQUEST['action']) || isEmpty($_REQUEST['action']))
throw new Exception('Programmer error: action not posted.');
else {
$action = $_REQUEST['action'];
switch($action) {
case 'get-writer-data':
getWritersData();
break;
case 'update-writers':
select();
break;
default:
throw new Exception("Unknown action: " . $action);
break;
}
}
if (!isset($_REQUEST['action']) || isEmpty($_REQUEST['action']))
throw new Exception('Programmer error: action not posted.');
else {
$action = $_REQUEST['action'];
switch($action) {
case 'get-writer-data':
getWritersData();
break;
case 'delete-writers':
deleteWritersData();
break;
case 'update-writers':
saveWritersData();
break;
default:
throw new Exception("Unknown action: " . $action);
break;
}
}
?>
JS
$(function () {
populateWritersDropdowns();
data = {};
data.action = 'get-writer-data';
data.userid = sessionStorage.getItem("user-id");
console.log("user-id-manage-uploads=" + sessionStorage.getItem("user-id"))
ajax('post', 'php/manage-uploads.php', data, getSuccess, "Error retrieving writer's data: ");
$(".tr-clone");
function getSuccess(data) {
console.log("data=" + data);
var trClone = $(".tr-clone");
var jsonData = $.parseJSON(data);
var count = 0;
for (var key in jsonData) count++
$.each(jsonData, function (key, value) {
trClone.find(".title").val(value.Title);
trClone.find(".work-type").val(value.WorkType);
trClone.find(".form-type").val(value.FormType);
trClone.find(".genre").val(value.Genre);
console.log("value.FormType=" + value.FormType + ", form-type.val()=" + trClone.find(".form-type").val());
console.log("value.Genre=" + value.Genre + ", genre.val()=" + trClone.find(".genre").val());
trClone.find(".form-type").val(value.FormType);
trClone.find(".nbr-pages").val(value.NumberOfPages);
trClone.find(".synopsis a[href='" + value.Filename + "']");
if (key === count - 1) return false;
trClone = trClone.clone().insertAfter($(".tr-clone:last"));
});
}
console.log
在 JS 代码中，JSON.parse(...) 抛出如下错误。
data=[{"Title":"Mozart, Wunderkind","0":"Mozart, Wunderkind","WorkType":"1","1":"1","FormType":"4","2":"4","Genre":"12","3":"12","NumberOfPages":"250","4":"250","Filename":"6532744220.pdf","5":"6532744220.pdf","OriginalFilename":"MozartWunderkindQueryLetter.pd","6":"MozartWunderkindQueryLetter.pd"},{"Title":"Mozart, Wunderkind Query-Letter","0":"Mozart, Wunderkind Query-Letter","WorkType":"2","1":"2","FormType":"7","2":"7","Genre":"9","3":"9","NumberOfPages":"129","4":"129","Filename":"9981287843.pdf","5":"9981287843.pdf","OriginalFilename":"MozartWunderkindQueryLetter.pd","6":"MozartWunderkindQueryLetter.pd"}][{"Title":"Mozart, Wunderkind","0":"Mozart, Wunderkind","WorkType":"1","1":"1","FormType":"4","2":"4","Genre":"12","3":"12","NumberOfPages":"250","4":"250","Filename":"6532744220.pdf","5":"6532744220.pdf","OriginalFilename":"MozartWunderkindQueryLetter.pd","6":"MozartWunderkindQueryLetter.pd"},{"Title":"Mozart, Wunderkind Query-Letter","0":"Mozart, Wunderkind Query-Letter","WorkType":"2","1":"2","FormType":"7","2":"7","Genre":"9","3":"9","NumberOfPages":"129","4":"129","Filename":"9981287843.pdf","5":"9981287843.pdf","OriginalFilename":"MozartWunderkindQueryLetter.pd","6":"MozartWunderkindQueryLetter.pd"}]
VM1161:1 Uncaught SyntaxError: Unexpected token [ in JSON at position 613n.parseJSON @ jquery.min.js:4getSuccess @ VM1137:13(anonymous function) @ VM1136:97j @ jquery.min.js:2k.fireWith @ jquery.min.js:2x @ jquery.min.js:4(anonymous function) @ jquery.min.js:4
最佳答案
在这里仔细查看您的 JSON 字符串，我发现您正在回显该字符串两次......以便它被发送到客户端两次附加，这就是为什么它没有以正确的方式显示.. .
您可以使用JSON parser在线工具来了解你的 JSON 字符串......所以你需要在你的 php 代码中弄清楚为什么它被发送两次，它一定是像你已经回显了两次......如果你把你的完整的 php 代码，那么我们可以为您提供更多帮助..
因此，您需要更正来自服务器的响应，因为 JSON 编码工作正常，并且编码的字符串应该只响应一次
宾果!!!在您的 php 代码中，您在 if (!isset($_REQUEST['action']) || isEmpty($_REQUEST['action'])) 行后执行 switch case 两次，请参见下文，这就是它回显两次的原因。 .并且破坏了你的 JSON 字符串
if (!isset($_REQUEST['action']) || isEmpty($_REQUEST['action']))
throw new Exception('Programmer error: action not posted.');
else {
$action = $_REQUEST['action'];
switch($action) {
case 'get-writer-data':
getWritersData();
break;
case 'update-writers':
select();
break;
default:
throw new Exception("Unknown action: " . $action);
break;
}
}
if (!isset($_REQUEST['action']) || isEmpty($_REQUEST['action']))
throw new Exception('Programmer error: action not posted.');
else {
$action = $_REQUEST['action'];
switch($action) {
case 'get-writer-data':
getWritersData();
break;
case 'delete-writers':
deleteWritersData();
break;
case 'update-writers':
saveWritersData();
break;
default:
throw new Exception("Unknown action: " . $action);
break;
}
}
关于javascript - 为什么 json_encode 返回数组而不是对象？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/37501210/