What is the best method for managing a JSON javascript post when encountering a 500 error?

When it comes to writing a JSON block, there are various methods one can use. Personally, I prefer the following approach:

$.post('/controller', { variable : variable }, function(data){
    if(data.status == '304') {
        // No changes over the previous
    } else if(data.status == 'ok') {
        // All is good, continue on and append whatever...
    } else if(data.status == 500) {
        // Server error, brace yourself - winter is coming!
    }
}, "json");

I have experimented with changing the last condition to statements like else if data.status == null, 500, false, or simply as an else statement, but with no success. It appears that due to returning a 500 error and failing to retrieve any information at all, the code does not execute anything within the brackets. Is there a need for an exception to be implemented outside of it, or am I mistaken?

What steps should I take to make this function without relying on something similar to

$.ajax({
    url : '/controller',
    type : 'POST',
    dataType : {
        lookup : JSON.stringify(lookup)
    },
    data : lookup,
    contentType : 'application/json; charset=utf-8',
    success: function (data) {
        // Stuff
    },
    error: function (xhr, ajaxOptions, thrownError) {
       // Stuff
    }
});

Appreciate your help!

Answer №1

When using the $.post() method, the third parameter known as success is only executed upon successful completion. If an error status like 500 occurs, the function will not be triggered.

Instead of relying solely on the success parameter, you can utilize the Deferred object that is returned by $.post(). This object includes an always() method which runs regardless of whether the request was successful or failed:

$.post('/controller', { variable : variable }, null, "json")
    .always(function(data, textStatus, jqXHR) {
        if(jqXHR.status == 304) {
            // No changes from previous
        } else if(jqXHR.statusText == "OK") {
            // Everything is fine, proceed and append content...
        } else if(jqXHR.status == 500) {
            // Server error - prepare for potential issues
        }
    });

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