Short and sweet application. On submitting the form a, b values are passed to self(same page) using GET method. On reload the JS fetches values of a & b from URL using getUrlParameter Method and computes there sum.

Code

$(document).ready(function(){
	var a = getUrlParameter("a");
	var b = getUrlParameter("b");
	if(a!="" && b!=""){
		if($.isNumeric(a) && $.isNumeric(b)){
			$("#output").html(+a + +b);
		}
		else  $("#output").html("Enter only numbers.");
	}
	else $("#output").html("Please fill the input and hit add button.");
});

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