Trouble encountered in converting the ajax data that was received

Ajax is commonly used to fetch data from the server.

The data is successfully displayed in an alert as

data: {"status": "Active","broadcastmsg": "msg"}

However, when displayed in HTML i.e. <p id="demo"></p>, it shows up as undefined.

This seems like a minor issue but I have been trying to resolve it for the past 24 hours with no success. Any suggestions on what might be going wrong would be greatly appreciated.

Client.php

<!DOCTYPE html>
<html>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>

<body>
<script>
    function myFunction(val) {

            $.post("test.php",
            {
              d_id: 1,
              date: val
            },
            function(hstatus){
                alert(hstatus);
                myJSON = JSON.stringify(hstatus);
                localStorage.setItem("testJSON", myJSON);

                //Retrieving data:
                text = localStorage.getItem("testJSON");
                obj = JSON.parse(text);
                document.getElementById("demo").innerHTML = obj.status;
            });
        }

    </script>
        <p id="demo"></p>
        <div id="future_date" style="display:block;" class="col-xs-12">             
            <input type="date" name="txt" value="" onchange="myFunction(this.value)">
        </div>

        </body>
    </html>

EDIT

If we manually pass

hstatus = {"status": "Active","broadcastmsg": "msg"}
, it displays the result properly.

Therefore, the issue lies in converting from

data: {"status": "Active","broadcastmsg": "msg"}

to

{"status": "Active","broadcastmsg": "msg"}

Answer №1

Latest Update:

In case the JSON data is prefixed with "data: ", make sure to trim it using the following code snippet:

myData = rawData.slice(6);

Refer to: https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/String/slice

Solution A: Include an additional (dataType) parameter when making the $.post call, so that jQuery can correctly determine the content type and not return plain text. https://api.jquery.com/jquery.post/

$.post("test.php", {
     id: 1,
     currentDate: value
}, function() { /*...*/ }, 
"json");

Verify that your test.php file sends the correct Content-Type: application/json http header (refer to: http://php.net/manual/en/function.header.php).

Solution B: (not recommended) Simply remove the JSON.stringify() part from the callback function:

function(response){
    localStorage.setItem("jsonData", response);
    //Retrieve data:
    content = localStorage.getItem("jsonData");
    objData = JSON.parse(content);
    document.getElementById("output").innerHTML = objData.status;
});

Pro Tip:

Utilize the console.log() method for debugging variable values to accurately view the typed value in your browser console (press F12 in most browsers). Avoid using the alert() function as it tends to display misleading results by automatically converting values into strings.

Answer №2

I have a suspicion about the string format being returned from the server.

If your alert displays something like this: data: {"status": "Active","broadcastmsg": "msg"} Then JSON.parse will not be able to interpret it correctly. This will result in a syntax error since it's not recognized as an object or any specific type.

The correct format for the string that should be sent from the server for JSON.parse to work properly is as follows: {"data": {"status": "Active","broadcastmsg": "msg"}}

One possible solution I can think of is: The hstatus parameter in the success callback function is a plainObject. So, you can try the following:

myJSON = JSON.stringify(hstatus.data);

If this doesn't solve the issue, please let me know so I can investigate further.

Answer №3

Ensure you are accessing the status property using obj.data.status rather than obj.status

 document.getElementById("output").innerHTML = obj.data.status;

Answer №4

One possible solution is to attempt the following:

document.getElementById("result").innerHTML = dataObject.code.status;

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