In ASP.NET with JQuery, how would you define and handle exceptional conditions

I use $.ajax to call a .asmx to get JSON data back. The server side process 开发者_运维知识库will meet some exceptional conditions which will give back to client error response for displaying error message.

How would you design the error hanlding mechanism? I mean what would you make server side retrun and let client handle the error?

Thanks.

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If it's just an error message (a string), then you can just return that string and set the status to 500 so jQuery recognizes it's not a successful request. Then just use your error handler (or a global .ajaxError() handler for all requests) to do what you want with that message.

For example a simple way to handle all errors like this (instead of per-$.ajax() call) would be:

$(document).ajaxError(function(e, xhr) {
  alert("There was an error, server responded with: " + xhr.responseText);
});

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ther's an error handler in jquery just like the success function, you need to handle it:

function CallWebService(ParentPage) {
    $.ajax({
        type: "POST",
        url: "../Admission/AdmissionService.asmx/LoadLocations",
        data: "{'ParentPage':'" + ParentPage + "'}",
        contentType: "application/json; charset=utf-8",
        dataType: "json",
        success: function (data) {
            $('.innerHospitalCensusdiv').html(data.d);
            BindSelectLocation();
        },**error: function(ex){
            //handle error here
        }**
    });
}