Why is My jQuery Ajax Success Event Failing Despite a 200 OK Response?

jQuery Ajax Success Event Failing Despite 200 OK Response

jQuery's Ajax request mechanism typically interprets the response body based on either the specified dataType parameter or the Content-Type header received from the server. However, if this conversion process encounters errors, such as invalid JSON or XML data, jQuery executes the error event.

Problem Investigation

In this specific scenario, the provided jQuery code defines dataType: "json", indicating that it expects the response to be in JSON format. However, the server-side code in JqueryOperation.aspx is outputting a plain HTML snippet with the status 200 OK. This inconsistency leads to jQuery failing to parse the response as valid JSON, resulting in the error callback being triggered.

Solution

To resolve this issue, prevent jQuery from interpreting the response as JSON. To do so, remove the dataType parameter from the jQuery code. Additionally, modify the server-side code in JqueryOperation.aspx to return:

Content-Type: application/javascript

alert("Record Deleted");

Alternatively, for a more robust approach, consider returning a JSON response and displaying the message within the success callback:

Content-Type: application/json

{"message": "Record deleted"}

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