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Jquery ajax returns error on 200

You must use double Quotes( for property names and string values), or at least when i. You have to check ajax response if it is valid or not. When you specify in ajax: dataType: ' json',. jQuery will fire the error event if the response cannot be parsed as JSON, even if server returns 200 OK. Check the data returned. ajax attempts to convert the response body depending on the specified dataType parameter or the Content- Type header sent by the server. If the conversion fails ( e. if the JSON/ XML is invalid), the error callback is. This is because you have specified return datatype to be json and the API is not returning a valid json. Try changing the return type of your method to JsonResult and return valid jsonstring from your method. This is really boggling my mind. I get an error callback from ajax. But if I take the res.

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    Returns jquery error

    responseText ( which comes back correct, btw) from the error message and use it, it does the right thing. Just as if I had received a success callback. I had a similar problem recently when upgrading to jQuery 1. Despite getting a correct response the error handler fired. I resolved it by using the complete event and then checking the status value. g: complete: function ( xhr. サーバーからHTTP STATUS 200が返されたのが事実だとしても、. error( ) が呼び出さ れていることもまた事実ですよね。. success: function( response) { 正常時の処理 }, error: function( xmlhttprequest, textstatus,. 掲題の通りの現象なのですが、 $. ajaxでアクセス自体はstatus 200で返っているのに errorが呼び出されることがありました。 例だと dataType: ' xml' でアクセスしていることが わかると思います。 レスポンスがjsonの場合は dataType: ' json' と.

    Could this - jquery ajax has a problem getting return value from ashx handler - be a possible answer? Seems to be having the same problem as you! EDIT: I' m curious about the reasons behind it as well. A null might te that $. ajax with dataType: json will fire the error handler even if the server returns 200 OK but the response is invalid JSON. The syntax error is not in your JavaScript code but in the JSON. Identify where the < is coming.