Question

        function ChatServerQuery(data_json) {

        var result = null;

        $.ajax({
            url: 'chat/backend/',
            type: 'POST',
            data: data_json,
            success: function(json) {
                result = json
            }
        })

        return result

    }

My function that executes a request to the server. The problem is that I can not return received from the server text. I do not know how to take from an anonymous function (event success) to ChatServerQuery (where you can easily get it back).

Answer 1

You’d better change your approach to reflect an asynchronous nature of AJAX request.

Using callback function

function ChatServerQuery(data, callback) {
    $.ajax({
        url:  'chat/backend/',
        type: 'POST',
        data: data,
        success: callback
    });
}

Then you would use it:

ChatServerQuery(dataObject, function(data) {
    // work with your data came from server
});

Using promise object

$.fn.ajax returns object implementing Promise iterface, so you can use it like this:

function ChatServerQuery(data) {
    return $.ajax({
        url:  'chat/backend/',
        type: 'POST',
        data: data
    });
}

ChatServerQuery(dataObject).done(function(data) {
    // work with your data came from server
});

This option offers you more flexibility.