Global AJAX Success handler that inspects JSON data

All my REST services return some common flags as part of every JSON response structure. For example, a notifications flag. How can I cleanly setup something to hook into every ajax request made on the page to check the response payload for the presence of these flags.

I'd also lik开发者_JAVA百科e to do something similar on the request, by having something auto add certain common parameters to the URL prior to the call.

Help please!

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It sounds to me like .ajaxSuccess() ^{doc here} would let you do what you want as it is a centralized method that gets called upon success for all jQuery ajax requests. Other global ajax handlers are listed here.

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One possible way would be to set up a converter:

For instance, I use one to detect my asp.net version (3.5+ returns stuff differently) for existance of the "d" property:

$.ajaxSetup(
    {
    data: "{}",
    dataType: "jsond",
    type: "POST",
    contentType: "application/json",
    converters:
    {
        "json jsond": function(msg) {
        return msg.hasOwnProperty('d') ? msg.d : msg;
        }
    }
});

You could likewise do the same with success:

$.ajaxSetup(
    {
    data: "{}",
    dataType: "json",
    type: "POST",
    contentType: "application/json",
    success:
    {
        "json": function(msg) {
            MyGlobalvariable = msg.hasOwnProperty('MyFlag') ? msg.MyFlag : "";
        }
    }
});