successive ajax requests

I am facing a challenge where I need to execute two separate ajax calls sequentially. The second call relies on the result of the first call for its data. Despite my efforts, I haven't been able to achieve the desired outcome. Here's what I have attempted:

$.ajax({
       url:myurl,     // 'myurl' is defined elsewhere
       type:'POST',
       data: mydata,  // 'mydata' is defined elsewhere

       success: function(data, textStatus) { 
           if (textStatus=='success'){
              // Extract paramValue from the data
              // Attempting to make another similar ajax call here
              callNextAjax(paramValue); // This function initiates a similar ajax call but consistently receives an error callback
           }
       },
       error: function(jqXHR, textStatus, errorThrown) {
           alert("First Request Failed");
       }     
});

function callNextAjax(paramValue){
  $.ajax({
           url:myurl1,     // 'myurl1' is defined elsewhere
           type:'POST',
           data: mydata1,  // 'mydata1' is defined elsewhere and utilizes paramValue

           success: function(data, textStatus) { 
               if (textStatus=='success'){
                  goToNewHtmlPage(); // Function to navigate to a new html page
               }
           },
           error: function(jqXHR, textStatus, errorThrown) {
               alert("Second Request Failed");
           }     
    });
}

The callNextAjax() function encounters issues when trying to utilize the value of paramValue. When executed outside the success function of the initial ajax call, it works as intended and proceeds to the next page through the goToNewHtmlPage() function.

I am puzzled by the inconsistencies in my implementation and have exhausted all my attempts at troubleshooting. Any insights or guidance would be greatly appreciated at this point.

Answer №1

Here's a suggestion for your code:

CheckResponse = function() {

    var apiUrl = "http://api-url";

    return {

        handleError: function(jqXHR, textStatus, errorThrown) {
                   alert("Error: Initial Request Failed");
        },
        handleSuccess: function(data, textStatus) { 
                   if (textStatus === "success"){
                     this.makeAjaxCall(data);
                   }
               },

        makeAjaxCall: function(userData){
            $.ajax({
               url: apiUrl,
               type: 'POST',
               data: userData,

               success: this.handleSuccess,
               error: this.handleError
            });
        }
    };
}();

CheckResponse.makeAjaxCall(SomeData);

Answer №2

It's fascinating how intricate the realm of JavaScript can be, often leading to confusion. The asynchronous nature of jQuery and JavaScript as a whole can make it challenging to craft synchronous code smoothly. This is where Flow Control libraries shine. While there are several options out there (such as async which boasts a large user base on Node.js), Frame.js stands out for its ability to untangle this issue, keep the code readable, and tackle larger problems with ease.

Frame(function(next){
    $.ajax({
       url:myurl,     // myurl defined elsewhere
       data: mydata,  // mydata defined elsewhere
       success: function(data, textStatus) { 
           if (textStatus=='success'){
              // ... Get paramValue from the data
              next(paramValue);
           }
       },
       error: function(jqXHR, textStatus, errorThrown) {
           alert("First Request Failed");
           next();
       }     
    });
});
Frame(function(next, paramValue){
  if(paramValue){
    $.ajax({
        url:myurl1,     // myurl1 defined elsewhere
        data: mydata1,  // mydata1 defined elsewhere.  mydata1 uses paramValue
        success: function(data, textStatus) { 
            if (textStatus=='success'){
                next(secondParamValue);
            }
        },
        error: function(jqXHR, textStatus, errorThrown) {
            alert("Second Request Failed");
            next();
        }     
    });  
  }
});

Frame(function(next, secondParamValue){
  if(secondParamValue){
      goToNewHtmlPage(); // open up a new html page in this function
  } else {
      // do something else
  }
  next();
});

Frame.start();

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