Tips for showing error messages in response to exceptions

My function is supposed to display the response text that comes back from ex.responseText. However, every time I attempt it, it returns as "undefined" even though the text is there.

onError: function (ex) {
    $('<div>' + ex._message + '</div>').dialog({
        modal: true,
        resizable: false,
        title: "Items",
        buttons: { "Okay": function () { $(this).dialog("close"); } }
    });
}

I then tried the following:

$('<div>' + ex.responseText + '</div>').dialog({
    modal: true,
    resizable: false,
    title: "Items",
    buttons: { "Okay": function () { $(this).dialog("close"); } }
});

However, this shows me the error in the format:

{"message":"You have entered duplicate items. Please remove."}

I simply want it to display the actual message:

You have entered duplicate items. Please remove.
without the curly brackets and "message" text.

I also attempted:

var message = JSON.parse(ex.responseText)._message;
$('<div>' + message + '</div>').dialog({
    modal: true,
    resizable: false,
    title: "Items",
    buttons: { "Okay": function () { $(this).dialog("close"); } }
});

But it continues to return as undefined. What am I doing incorrectly?

Answer №1

When handling error messages in JavaScript, remember to access the specific key within the responseText object, like ex.responseText.message.

It can be illustrated more explicitly with this code snippet:

ex.responseText = {
    "message": "You have entered duplicate items. Please remove."
}

ex.responseText.message = "You have entered duplicate items. Please remove.";

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