Why Does My jQuery Ajax Call Trigger an Error Event Despite a 200 OK Response?

Handling 200 Responses with jQuery Error Events

When issuing Ajax requests, it's common to encounter a situation where the server returns a 200 OK status code, indicating a successful request, but jQuery's error event is triggered. This can be particularly puzzling, as the request appears to have been completed successfully.

To understand this behavior, it's crucial to recognize that jQuery attempts to interpret the response body based on the specified dataType parameter or the Content-Type header sent by the server. However, if this conversion fails (e.g., due to invalid JSON or XML), jQuery fires the error callback.

Consider the provided jQuery code:

dataType: "json"

With this setting, jQuery expects a valid JSON response from the server. However, the C# code on the server-side is returning an HTML snippet, which is not JSON. This leads jQuery to fail the conversion, resulting in an error callback being invoked.

To address this issue, you can either:

• Remove the dataType parameter: This will prevent jQuery from attempting the automatic conversion, allowing you to handle the success or failure based on the status code alone.
• Configure the server-side code to return valid JSON: This involves modifying the Content-Type header to application/javascript or application/json, depending on your needs, and returning a well-formed JSON response.

Alternatively, you can consider displaying the success message within the success callback instead of relying on the server-side code to provide an alert:

success: function (result) {
  alert("Record Deleted");
}

By implementing these solutions, you can ensure that your Ajax request handles 200 OK responses correctly and provides the expected behavior.

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