检查ajax响应javascript

Question

I have an ajax form on a page that receives a true or false response. What I am trying to do is check if the response exists or not and run javascript based on that, but I am a little stuck.

$( "#button" ).click(function() {

// if previous ajax response = true
// do nothing
// if previous ajax response is not = true or does not exist
   dosomething();

});

ajax:

                success:function(response){
                //log on success
                console.log(response);
                if(response == "true"){dosometing();}
                    if(response == "false"){alert("some alert");}
            },
            error:function(jqXHR,error){
                //write the error log
                console.log(jqXHR.status + " " + error);
            }

Maybe I'm not asking the right question.

EDIT 2: the ajax form is actually submitted elsewhere on the page. I'm just trying to see if it was called or not at some other point on the page.

Answer 1

Try this out to check response has set.

if($.plainObject(response)){
    doSomething();
}

Answer 2

if your web method return a value (exp: bool) you will find it in response.d

success:function(response){
                    //log on success
                    console.log(response.d);
                    if(response.d == "true"){dosometing();}
                        if(response.d == "false"){alert("some alert");}
                },
                error:function(jqXHR,error){
                    //write the error log
                    console.log(jqXHR.status + " " + error);
                }