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

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Inexperienced individual asks: 'Is it possible to accomplish this task using Dojo and Ajax?'

On my website, there is a feature that sends an initial request to a web service. Once this request is sent, the user has to wait for a specific amount of time before being able to send a second request. During this waiting period, I would like a countdo ...

Updating the state of a React Component using data from 2 input fields

I am facing an issue with two input fields of type "file" in a React component. My goal is to load a JSON file into each input field, save the data from both files into separate variables, and update the state of the component. However, I have noticed that ...

Creating valuable properties in TypeScript is a skill that requires knowledge and practice

In TypeScript, there is a unique feature available for defining properties with values using the `value` keyword. class Test { constructor(private value: number = 123) { } public MyValueProperty: number = 5; } Here is how you can define such ...

Creating an HTML file using PUG in a local environment (using npm and gulp)

Is there a way to automatically generate an HTML file with the same name as my Pug file whenever I save using gulp? I've checked all the documentation on but it only explains how to return Pug content in console... ...

Add an array as a nested child within another array using node.js and JavaScript

Description: I execute a MySQL query to retrieve rows from a table > connection.query(q2,function(err,rows){...} Assuming the rows have a structure like {id:",,,", time:"..." etc:"cc"} For each row, I then query another table to fetch additional dat ...

Using a CSS style to modify a class based on another class at the same level in the hierarchy

I am working with a jQuery carousel that is adding an 'active' class to images within a div. Within the same div, there is also a span with a 'fade' class that has a CSS style of opacity: 0. Is there a way to change the CSS style of the ...

Using PHP to calculate the total number of records within an HTML document

I am currently working on a PHP script to establish a connection with my MySQL database in order to retrieve the total number of users registered on my forum by counting the records in the table. The PHP script should display the total count above the sec ...

When using mongoose, is it possible to add a new item and retrieve the updated array in one endpoint?

My API endpoint for the post operation query using mongoose is not returning the updated array after adding a new item. I have been struggling with this issue for 3 days without any success. Any help would be greatly appreciated. router.post("/:spot ...

How to use the window.confirm method to print the HTML tag in an AJAX post

Is there a way to display a confirmation window for users who want to delete data from the database without including HTML tags like <strong> or <br />? I am currently using the confirm() function as follows: var str = document.getElementById ...

There seems to be an issue with the visibility of the b-button within the b-table component in

I'm new to Vue Js and I'm having trouble with my b-button not displaying in my table. I can't figure out why. Below is my HTML code: <div id="listlocales"> <div class="overflow-auto"> ...

Tips for choosing a single row in a table using a checkbox

I need help with a table that has multiple rows and four columns. One column is for checkboxes, while the other three are select boxes set to read-only. I want users to be able to edit only one row at a time by checking the checkbox in the first column. If ...

Incorporating geocoding functionality in an asp.net mvc project and looking to efficiently transfer latitude and longitude data from JavaScript to a controller function

UPDATED. Following your suggestions, I implemented the function as shown below: [HttpPost] public ActionResult populate_place(string lati, string longi) { list_placesModels list_place = new list_placesModels(); list_place.Latitude = lati; li ...

Unable to resolve the issue with ExpressPeerServer not being recognized as a function in server.js

I'm facing an issue with the peer.js library in my npm project. I have successfully installed it, but when I try to use it in my server.js file, I get an error saying that peerServer is not a function. const express = require('express'); con ...

How can I access the value of a textbox within a dynamically generated div?

In my project, I am dynamically creating a div with HTML elements and now I need to retrieve the value from a textbox. Below is the structure of the dynamic content that I have created: <div id="TextBoxContainer"> <div id="newtextbox1"> // t ...

Learn the steps for showing a kendoDropDownList using ajax in the ASP.NET MVC framework

I am currently facing an issue with my Kendo kendoDropDownList. I am trying to populate the drop down values by making an Ajax call. However, every time I click on the drop down, it calls the Action and retrieves the values, but the dropdown does not displ ...

Building React Typescript Components with Froala Editor Plugins

Attempting to integrate a custom plugin into a Froala Editor within my React application using the package react-froala-wysiwyg. Following a tutorial on incorporating a custom popup/plugin found here. Encountering an issue due to TypeScript incompatibility ...

Detecting the scroll events of elements with the overflow:hidden property

Looking to synchronize scrolling between two different panels or divs? In one element, there's an overflow: auto while the other has overflow: hidden (trying to mimic a grid with frozen columns). I've managed to sync the scroll when it occurs w ...

Using the v-for directive to loop through a list of items and adding a v-autocomplete with

I am facing a challenge with using a dropdown menu within a loop to select the region for each office in my list of offices. The problem lies in passing the index value to the updateRegion method so that I can correctly associate the selected region with t ...

Confusion surrounding asynchronous functions in Node.js

When handling routes or endpoints with multiple operations, I often encounter scenarios where I need to perform additional actions. For instance, when deleting an item, it's necessary to also remove the related file from S3 along with deleting the col ...

"Return to previous view with the zoom back feature in CanvasJS

How can I implement a zoom back button in CanvasJS using jQuery or normal JavaScript? I've been attempting to place it near the ones in the top right corner, but something seems to be amiss. Alternatively, is it feasible to enable zooming in and out ...