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How to return value from ajax success function in javascript?

You can store your promise, you can pass it around, you can use it as an argument in function calls and you can return it from functions, but when you finally want to use your data that is returned by the AJAX call, you have to do it like this: promise. success(function (data) { alert(data); });

How do I get Ajax return value?

var b = false; $. ajax({ async: true, contentType: ‘application/json; charset=utf-8’, type: “POST”, dataType: ‘json’, data: JSON. stringify(arrays), url: “MyHandler. ashx”, success: function (result) { b = true; }, error: function () { alert(‘Error occurred’); } });

What does an Ajax call return?

ajax() function returns the XMLHttpRequest object that it creates. Normally jQuery handles the creation of this object internally, but a custom function for manufacturing one can be specified using the xhr option.

What is success function data in Ajax?

A JSON object containing numeric HTTP codes and functions to be called when the response has the corresponding code. success. A callback function to be executed when Ajax request succeeds. timeout. A number value in milliseconds for the request timeout.

How do I wait for Ajax response?

use async:false attribute along with url and data. this will help to execute ajax call immediately and u can fetch and use data from server.

How can I speed up Ajax response?

  1. Use YSlow to profile and measure your website load times.
  2. Using CSS Sprites to reduce HTTP Requests.
  3. Load your CSS first and your JavaScript last.
  4. Using Subdomains for parallel downloads.
  5. Adding an Expires Header.

What is AJAX and how it works?

AJAX = Asynchronous JavaScript and XML. AJAX is a technique for creating fast and dynamic web pages. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server behind the scenes. This means that it is possible to update parts of a web page, without reloading the whole page.

Is jQuery dead?

jQuery has seen a significant decline in popularity over the past few years. With the rise of frontend JavaScript frameworks like Angular, Vue and React, jQuery’s quirky syntax and often-overwrought implementation has taken a backseat to this new wave of web technology. … jQuery may be outdated but jQuery is not dead.

What is URL in AJAX?

The url parameter is a string containing the URL you want to reach with the Ajax call, while settings is an object literal containing the configuration for the Ajax request. In its first form, this function performs an Ajax request using the url parameter and the options specified in settings .

What are the disadvantages of Ajax?

  1. Any user whose browser does not support JavaScript or XMLHttpRequest, or has this functionality disabled, will not be able to properly use pages that depend on Ajax.
  2. Multiple server requests need more data consumed at the client-side.
  3. Failure of any one request can fail the load of the whole page.

Is fetch better than Ajax?

Fetch is compatible with all recent browsers including Edge, but not with Internet Explorer. Therefore, if you are looking for maximum compatibility, you will continue to use Ajax to update a web page. If you also want to interact with the server, the WebSocket object is also more appropriate than fetch.

Why do we use Ajax?

Making Asynchronous Calls: Ajax allows you to make asynchronous calls to a web server. This allows the client browser to avoid waiting for all data to arrive before allowing the user to act once more. … Increased Speed: The main purpose of Ajax is to improve the speed, performance and usability of a web application.

What is success and error in AJAX?

success and Error : A success callback that gets invoked upon successful completion of an Ajax request. A failure callback that gets invoked in case there is any error while making the request.

Is AJAX a framework?

AJAX. OOP, an open source framework, it provides an OOP-style programming engine and Ajax requests-handling functionality to create web 2.0 components.

What is dataType in AJAX call?

contentType is the type of data you’re sending, so application/json; charset=utf-8 is a common one, as is application/x-www-form-urlencoded; charset=UTF-8 , which is the default. dataType is what you’re expecting back from the server: json , html , text , etc.