解码从php文件中的ajax接收的json

Question

我通过 ajax 调用将 json 对象传递给我的 php 文件。

jQuery 语法

$.getJSON('http:..Sample/JsonCreation.php', function(data)
{
   //data has the json - I am trying to edit this json and then pass it to another php file through ajax and save in DB. I have successfully edited but unable to access the passed json in my php file.
   questionsArray = data;
}
$('form').on('submit', function(event)
{
//AJAX CALL
                $.ajax
                ({
                    url: "updateTestReport.php",
                    type: "post",
                    //JSON.stringify
                    data: {json:(questionsArray)},
                    contenttype: "application/json; charset=utf-8",
                    datatype: "text",

                    success: function(data)
                    {
                        //alert("success");
                        alert(data);
                    },
                    error:function()
                    {
                        alert("failure");
                    }
                });
});

PHP 文件

<?php

//$contentjson = file_get_contents("php://input");
//echo $_POST['json'];
$questionsArray = json_encode($_POST['json']);
echo $questionsArray;


?>

输出：

[{"questionNumber":"1","quesDesc":"The price of petrol has increased by 25%.By what percentage should it now be reduced to return to the original price?","optionA":"25%","optionB":"20%","optionC":"15%","optionD":null,"correctOption":"A","selectedAnswer":null,"isQuestionViewed":null},{"questionNumber":"2","quesDesc":"Price of cooking gas has increased by 10%. By what percentage should consumption be reduced to keep expenditure unchanged?","optionA":"9.09%","optionB":"10%","optionC":"11.11%","optionD":null,"correctOption":"A","selectedAnswer":null,"isQuestionViewed":null},{"questionNumber":"3","quesDesc":"A buys a shirt for Rs 100 and sells it to B for Rs 120. B now sells it to C for Rs 144. Had A sold it directly to C at the price C paid for it, then his profit % would have been","optionA":"10%","optionB":"20%","optionC":"44%","optionD":null,"correctOption":"C","selectedAnswer":null,"isQuestionViewed":null}]

1) php 文件中的 json_encode 是如何给出输出的。我不应该使用 json_decode 吗？ 2）即使通过编码的json，我也无法检索这些值。请让我知道如何访问此 json 中的值... 3) file_get_contents 和 $_POST['json'] 有什么区别？

编辑： //开始

我需要在 php 文件中访问我的 json，检索一些值，进行一些计算，保存在数据库中。然后返回主html文件。

//结束 请给出明确的解释...

Answer 1

就像我给你一个提交 ajax 的例子一样。 form#data -> #data 是表单的id

<script>
    $("form#data").submit(function() {
        if($("form#data").validationEngine('validate') != true){
         return false;
         }
        var formData = new FormData($(this)[0]);

        $.ajax({
            url: '/test/test.php',
            type: 'POST',
            data: formData,
            async: false,
            success: function(data) {
                data = jQuery.parseJSON(data);
                if (data.result == true) {
                    alert('Your details updated successfully.');
                }
                else if (data.result == false) {
                    alert("Your details not updated!");
                }
            },
            cache: false,
            contentType: false,
            processData: false
        });

        return false;
    });
</script>

现在我向您展示在 ajax 调用中请求的 test.php。

<?php
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && ( $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' )) {
    $mt = $_POST['tmt'];
    if($mt!=NULL){
            $res11['result']=TRUE;
        }else{
            $res11['result']=FALSE;
        }
        echo json_encode($res11);
}
?>

这是通过 ajax post 获取数据的 php 文件。如果您有任何疑问或其他疑问，可以询问。

Answer 2

您想转换或获取您在 php.ini 中编码的数组。 ajax的解决方案我已经给你了

<script>
            $.ajax
                    ({
                        url: "updateTestReport.php",
                        type: "post",
                        //JSON.stringify
                        data: {json: (questionsArray)},
                        contenttype: "application/json; charset=utf-8",
                        datatype: "text",
                        success: function(data)
                        {
                            /*
                             * Below this comment you can also use 
                             * data = jQuery.parseJSON(data);
                             * It will decode json encoded
                             */
                            data = jQuery.parseJSON(data);
                            alert(data.questionNumber);
                            alert(data.quesDesc);
                            /*
                             * put the array keys using the period in between with data variable
                             * 
                             */
                            alert(data);
                        },
                        error: function()
                        {
                            alert("failure");
                        }
                    });
        </script>

如果您有任何疑问，请告诉我。

Answer 3

如果您通过警报直接打印值，它将显示[Object]，因为响应是 JSON 格式。试试alert(res[0].questionNumber)，这将显示第一个问题编号

尝试这样的方法来访问值

success: function(res)
{
 for(var i=0;i<res.length;i++)
 {
    qno = res[i].questionNumber;
    desc = res[i].quesDesc;
    // and so on
    // do whatever you want this data
 }
},