Tips for retrieving multiple data outputs from an ajax success function

Within my project, I have two separate JavaScript files named myJs1.js and myJs2.js. One of the methods in myJs1.js is invoking a method from myJs2.js.

My goal is to retrieve the values r1 and r2 into the results (within myJs1.js).

I attempted to achieve this by declaring the variables r1 and r2 prior to the ajax call, and upon completing the ajax call, I included:

return [r1,r2];

Unfortunately, it returned r1 and r2 as undefined. Upon conducting further research, I discovered that adding async: false might solve the issue, but it comes with various drawbacks (such as browser freezing). Despite attempting this approach, I was still unable to capture the values of r1 and r2.

Note: This is my first time working with AJAX, so please take that into consideration.


UPDATE: In myJs1, there is an ajax call where the method is invoked on success. My intention is to obtain the result to trigger another method within myJs1.

SEE BELOW FOR THE CODE

myJS1:

function method() 
{

$.ajax({ 
    type: "GET",
    dataType: "json",
    url: "http://127.0.0.1:8000/***/***",
    success: function(response){
        result = methodOfmyJs2(response);
        load1(r1); // utilizing r1 from the obtained result
        load2(r2); // utilizing r2 from the obtained result
    }
})

}

myJs2 :

function methodOfmyJs2(data)
{
    $.ajax({ 
    type: "GET",
    data: SomeData,
    dataType: "json",
    url: "http://127.0.0.1:8000/***/***",
    success: function(response){
      r1 = anotherMethodFromThisJS1(response);
      r2 = anotherMethodFromThisJS2(response); 
      result = [r1, r2]
    }
})

}

To proceed, I need to be able to access the values of r1 and r2 for invoking the load1 and load2 methods within myJs1.

Answer №1

By default, Ajax calls are executed asynchronously. This means that the function jQuery.ajax() will not wait for the HTTP response to return before proceeding.

To retrieve data after the HTTP response has been received, a callback must be provided. This is typically done using the success function. If you need to access this data within another function, simply call that function within the success callback.

The following code demonstrates this:

//JS1.
function processResponse(r1, r2) {
    // perform processing with r1 and r2 here
}

//JS2.
function methodOfmyJs2()
{
     $.ajax({ 
        type: "GET",
        data:somedata,
        dataType: "json",
        url: "http://127.0.0.1:8000/****/****",
        success: function(response){
            r1=anotherMethodFromThisJS1(response);
            r2=anotherMethodFromThisJS2(response); 

            //calling the success callback
            processResponse(r1, r1);
        }  
    }); 
}

If needed, there is an option to make synchronous Ajax calls as shown below:

$.ajax({
    type: "GET",
    url: remote_url,
    async: false,//now call is synchronous
    success : function (data) {
    }
});

In this case, jQuery.ajax() will pause until the HTTP response is received, allowing you to return [r1, r2] from methodOfmyJs2().

It is advised to avoid synchronous calls as it can freeze the UI by making the JavaScript thread wait.

Answer №2

Consider utilizing a callback function in this scenario.

[UPDATE]

myJS1:

function fetchData() {
    $.ajax({ 
        type: "GET",
        dataType: "json",
        url: "http://example.com/api/data",
        success: function (response) {
            processResponse(function (result1, result2) {
                displayData(result1);
                handleOutput(result2);
            });
        }
    });
}

myJS2:

processResponse(callback) {
    $.ajax({
        type: "GET",
        data: requestData,
        dataType: "json",
        url: "http://example.com/api/results",
        success: function (response) {
            var result1 = analyzeOne(response);
            var result2 = analyzeTwo(response);

            callback(result1, result2);
        }
    });
}

Answer №3

$.ajax brings back a promise object, allowing for sequential execution using then method

function handleAjaxData() {
    fetchData().then(function(data){
      // process data from first request and pass to second request
      return processData(data);        
    })
  .then(function(updatedData){
   // retrieve processed data 
    $('#result').text(JSON.stringify(updatedData));
  })
    return false;
}

Give it a try: https://jsfiddle.net/ab12cd34/

If you aim to directly get the results from handleAjaxOutput - that's not possible (unless you make synchronous requests) - you must instead return a promise encapsulating the ajax call and chain it with then

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