Receiving successful ajax responses and populating text fields with the returned values

I have been attempting to populate the values from an AJAX success response into their corresponding fields, but I am encountering some difficulties. Despite receiving the desired data in the "alert(responseObject)" within the success section, I am unable to get the values to show up in the fields as intended.

$(document).ready(function() {
    function myrequest(e) {
        var man_part_number = $('#man_part_number').val();
        $.ajax({
            method: "GET",
            url: "includes/autofill.php",

            data: {
                man_part_number: man_part_number
            },
            success: function(responseObject) {
                alert(responseObject);
                //The outcomes of this alert response are displayed in the attached image
                $('#manufacture').val(responseObject.manufacture);
                $('#model').val(responseObject.model);
                $('#type').val(responseObject.type);
            },
            failure: function() {
                alert('fail');
            }
        });
    }

    $('#fetchFields').click(function(e) {
        e.preventDefault();
        myrequest();
    });
});

<button type="button" id="fetchFields">Fetch</button>

<input type="text" name="manufacture" id="manufacture" />
<input type="text" name="model" id="model" />
<input type="text" name="type" id="type" />

Answer №1

The output you're receiving is not in JSON format. Take a closer look at the end of the string displayed in the Alert box. The presence of "test" indicates that jQuery is treating the response as text due to the absence of a specified dataType option. If you wanted the response to be treated as JSON, you would need to set the dataType option to "JSON". Otherwise, jQuery will default to parsing the response based on the Content-Type specified in the headers.

If the headers are not set correctly, jQuery will not automatically attempt to parse the response as JSON. Instead, it will interpret the response as plain text. This explains why the response appears to parse correctly as text, but the responseObject is not recognized as an Object. To avoid this issue, be sure to specify the dataType option in the $.ajax call or ensure that the server is sending the correct headers for proper parsing.

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