Tips for ensuring the validity of data in an AJAX request

When trying to fetch data using the REST method, I utilize an AJAX call. While my work is completed, I encounter an issue with validating the "data" within the AJAX call. How can I accomplish this? If there is no data returned from the specified URL, it triggers an error that needs to be resolved.

$.ajax({  
    'url': url_for_check_available_updates_tab7,
    'type':'POST',
    'async': false,
    'success':function(data){
        
        d = data.getElementsByTagName("col")[0].childNodes[0].nodeValue; 
        
        
    },
    error: function() {             
        $('#no_update').show();
    }
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
javascriptajax

Answer №1

Give this a shot:

if(data !== null && typeof data !== "undefined" && data.getElementsByTagName("col").length !== 0)

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