multiple callback functions in javascript

In my previous post i have explained about what is a callback function. In this post i am going to explain about multiple callback functions in javascript and how to use multiple callback functions.

Using two callback functions

A callback function is a function which is passed as a argument to the other function, and the callback function is "called back" inside that other function. Javascript also provides us to use multiple callbacks functions. We can pass two callback functions as argument to other function and we can call those two callback functions from that functions.

In the following example i am going to show you how we can use two callback functions

Example :

      function successcallBack(successData){
          alert(successData);
      }

      function errorcallBack(errorData){
          alert(errorData);
      }

     function checkNumbers(a,b,callback1,callback2){
          if(a==b)
              callback1('equal');
          else
              callback2('not equal');
     }

      checkNumbers(5,5,successcallBack,errorcallBack);

In the above example we are passing two numbers to "checkNumbers" functions and checking they are equal or not. If both the numbers are equal then we are calling successcallBack function and if the numbers are not equal we are calling errorcallBack function.

In this way you can use multiple callback functions in javascript.

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