When access to Ajax .responseText in an alert it can be displayed, however it cannot be stored in a variable or

var response_var=""; // Added for debugging purposes

ajax.onreadystatechange = function() {
    if (ajax.readyState == 4 & ajax.status == 200) {
        response_var = ajax.responseText;
        alert(ajax.responseText); // This alerts properly (some text).
        return ajax.responseText; // This is returning as undefined
    }
}

return response_var; // This is empty if I add line 1, if not in console it gives error response_var is not defined.

Why isn't the response being stored in the variable or returned? It seems like the scope of response_var ends within the onreadystatechange function so I tried using return. However, the value remains undefined.

Answer №1

When it comes to Ajax, things tend to happen out of sync with the regular flow of code. This is why it's called "Asynchronous JavaScript and XML". For tasks that require Ajax events, it's important not to wait for a return value. Instead, carry on with your task as soon as you receive the response from AJAX.

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

Struggling to make PayPal Cordova Plugin function properly in both production and sandbox modes

While using the cordova paypal plugin and switching to sandbox mode, I encountered an error. The plugin can be found at https://github.com/paypal/PayPal-Cordova-Plugin https://i.stack.imgur.com/lD2EH.png Running the plugin in PayPalEnvironmentNoNetwork m ...

Prevent further triggering of the .click function when the user clicks repeatedly

Is there a way to prevent the .click function from executing if the user clicks too many times? This is my current code: $('button').click(function() { $('#bg').fadeToggle('200'); }); Check out the jsfiddle DEMO ...

Pick a unique identifier for the <a> element and add an event listener to it

I am using an Ajax function to generate a table. Within one of the columns, there is an anchor field with a specific id. I am looking to trigger an event when that anchor field is clicked. Here is my current approach: $( "#26" ).on('click', &ap ...

Performing a function inside a JSON structure

I am dealing with a JSON object that contains a list of functions I need to access and run like regular functions. However, I'm struggling to figure out how to achieve this. Here is what I have attempted: Bootstrapper.dynamic = { "interaction": f ...

How can a method inside an object property of the same class be invoked in JavaScript?

I'm faced with a bit of confusion here. I have a class property called hotspot of type object, declared as follows: Cannon.prototype.hotspot = {stuff: this.blah(...) }; The method blah() is actually a prototype of the same 'class': Canno ...

"Enhance your Django website with a dynamic voting button using AJAX

I am working on a project where I have implemented the following code: (r'^oyla/(\d+)/$', oyla), Here is the view associated with this code snippet: @login_required def oyla(request, id): if request.is_ajax(): entry = Entry.ob ...

Issue with Ajax call not displaying the jQuery dialog box

Could you please take a look at this jsFiddle link... The issue lies with a jQuery UI dialog box that uses an ajax request to fetch content. Unfortunately, all I see is a blank dialog and can't seem to pinpoint the problem. A snippet of the HTML cod ...

Dividing a string in JavaScript to generate fresh arrays

I am currently dealing with the following string: "ITEM1","ITEM2","ITEM3","ITEM4","ITEM5","ITEM6","ITEM7"~100000000,1000048,0010041,1,1,1,1~100000001,1000050,,2,0,2,1~100000002,1068832,0 ...

What steps should I take to resolve this issue? ERROR TypeError: Unable to access property 'user' of null object

Is there a way to resolve the error I'm encountering in my project? The error message is: ERROR TypeError: null is not an object (evaluating 'userdata.user'). Using React Native Expo, I am facing this issue after logging into my app and navi ...

Clicking outside the div will cause the div to be hidden

Looking for some help with a jQuery issue. I have a pop-up that opens when a div is clicked, but I want it to close when clicking outside of the div instead of just on the close button. <a class="close-up" href="#" onclick="popup('popUpDiv')" ...

Changing dates in JavaScript / TypeScript can result in inaccurate dates being displayed after adding days

Recently, I encountered an issue with a simple code snippet that seems to produce inconsistent results. Take a look at the function below: addDays(date: Date, days: number): Date { console.log('adding ' + days + ' days'); con ...

Tips for storing an unmatched result in an array with a Regexp

Is it possible to extract the unmatched results from a Regexp and store them in an array (essentially reversing the match)? The following code partially addresses this issue using the replace method: str = 'Lorem ipsum dolor is amet <a id="2" css ...

When a named capture group is included in the regex of a GET path, Express crashes with the error message: "Cannot read property 'name' of undefined at Layer

I am looking to process a GET request and extract specific information from the URL. Let's consider this scenario: const REGEX_QUERY = /^\/?house\/(?<street>[a-z]+)\/(?<house>[0-9]+)$/i; const REGEX_QUERY_NO_NAMES = /^\ ...

What is the best way to implement a series of delayed animations in jQuery that are connected

Imagine you have the following items: <div id="d1"><span>This is div1</span></div> <div id="d2"><span>This is div2</span></div> <div id="d3"><span>This is div3</sp ...

Is it possible to utilize Jquery in order to add an opening <tr> tag and a closing </tr> tag within a dynamic table?

I have been experimenting with the code snippet below in an attempt to dynamically add a closing tag followed by an opening tag after every three cells, essentially creating a new row. Progress has been made as the DOM inspector shows a TR node; h ...

Utilizing AJAX to call a Java Servlet deployed on Tomcat

Seeking guidance on calling a Servlet from ajax in a Java WebApp with Tomcat7. To map the servlet in the WebApp, I utilized the @WebServlet("/VServlet") annotation due to Tomcat7 supporting Servlet 3.0. However, when using the jquery command "$.getJSON(&a ...

Tips for extracting popular song titles from music platforms such as Hungama or Saavn

I am looking to retrieve the names of the top trending songs/albums from platforms such as Hungama or Saavn. I experimented with web scraping packages available on npm to extract data from websites, including cheerio, jsdom, and request. Eventually, I came ...

Tips on utilizing the useState hook for storing numerous key objects?

Currently, I am working with a candlestick chart for a cryptocurrency that displays data over different timeframes such as 1 minute and 30 minutes. Below is the code snippet that sets the initial state to show a 1-hour chart when a user first visits: const ...

Guide on sending a message to a specific channel using Discord.js version 13 with TypeScript

After recently diving into TypeScript and seeing that Discord.js has made the move to v13, I have encountered an issue with sending messages to a specific channel using a Channel ID. Below is the code snippet I am currently using: // Define Channel ID cons ...

Experience seamless transitions with Material UI when toggling a single button click

When looking at the examples in the Material UI Transitions documentation, I noticed that there are cases where a button triggers a transition. In my scenario, I have a button that triggers a state change and I want the previous data to transition out befo ...