Compare the current return value to the previous value in the success callback of an Ajax request

I am currently running an Ajax request to a PHP DB script every 3 seconds, and I need to make a decision based on the result returned. The result is a timestamp. Let's say the ajax request is fired two times. I want to compare the first result with the second result. If they match, I need to do one thing; if they don't match, I need to do something else.

success:function(msg){
            console.log(msg);
        }

I have attempted to define another variable and store the value of msg in it to compare with the next value of msg, but the variable ends up changing along with the value of msg.
How can I retrieve both the previous and next values simultaneously for comparison?

javascriptajax

Answer №1

Save the outcome in a variable.

var previousOutcome;
$.ajax({
   ...
   success:function(response){
       if (previousOutcome === response) {
          ...
       }
       else {
          ...       
       }
       previousOutcome = response;
   }
});

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