Update 2016

You can use this tool to build your own 3 custom jQuery version.

jQuery Builder

As of jQuery 2.1.1

Full 2 file sized unminified is: 241.55 Kb

Ajax Only minified 1 is: 49.60 Kb

That is a 5x reduction in size.

As Darin already says, it's all or nothing. JQuery's 6 Ajax functions are closely intertwined with 5 the rest of the functionality.

There are 4 a few other, stand-alone Ajax libraries 3 around like Matt Kruse's Ajax toolbox - maybe that helps.

I would 2 consider loading the full jQuery library. If 1 you link to jQuery on a CDN, loading times will be minuscule.

Another option would be to use the built-in 8 fetch API provided by the browser.

Here is an 7 example snippet:

fetch('http://localhost:3000/users.json', {
  method: 'POST', 
  mode: 'cors', 
  redirect: 'follow',
  body: JSON.stringify({
     user: {
       firstName: 'john',
       lastName: 'doe'
     }
  }),
  headers: new Headers({ 'Content-Type': 'application/json' })
}).then(function() {
  /* handle response */
});

This blog post is a great introduction 6 to the API and shows more use cases.

fetch doesn't 5 have full cross-browser support yet (I think 4 mainly IE and Safari are lacking), but there 3 is polyfill that you can use until that 2 day comes.

fetch polyfill: https://github.com/github/fetch

Older browsers will 1 also need a Promise polyfill (one option, another option).

As of jQuery 1.8 you can do it: LINK

0

You can view standard javascript alternatives 2 to jQuery at youmightnotneedjquery.com

For example the alternative 1 to $.ajax post is:

var request = new XMLHttpRequest();
request.open('POST', '/my/url', true);
request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded; charset=UTF-8');
request.send(data);

And the alternative to $.ajax get is:

var request = new XMLHttpRequest();
request.open('GET', '/my/url', true);

request.onload = function() {
  if (request.status >= 200 && request.status < 400) {
    // Success!
    var resp = request.responseText;
  } else {
    // We reached our target server, but it returned an error

  }
};

request.onerror = function() {
  // There was a connection error of some sort
};

request.send();

I've created a custom build of jQuery 1.7.1 1 here:

https://github.com/dtjm/jquery/tree/ajaxonly

AMD user please read this, my answer is for 5 building a single file.
Or just use this 4 library: ded / reqwest (4 KB, min & gzip)

1. Download 3 source code and run npn i

2. Open /src/jquery.js and remove any moudle you 2 don't want, but keep "./exports/amd", "./exports/global"

   define([
       "./ajax",
       "./ajax/xhr",
       "./ajax/script",
       "./ajax/jsonp",
       "./exports/amd",
       "./exports/global"
   ], function (jQuery) {
       "use strict";
       return jQuery;
   });
   

3. Run grunt custom:-sizzle

4. Goto /dist and take 1 your build

Modules in your build now:

• core
• deferred
• ajax

Size:

• just build: 85 KB
• build with min: 26 KB
• build with min & gzip: 10 KB

If you really really want just the Ajax 9 parts of jQuery you can get the code from 8 their repository (https://github.com/jquery/jquery), glancing at it you 7 would want to look at "ajax.js" and 6 "core.js" in the "src" directory. You 5 would then want to compile them together 4 with the closure compiler or something.

But 3 as others stated, it would be a lot easier 2 to just load it from one of the CDNs (jQuery, Google, Microsoft) which 1 most users will have cached anyway.

YES, I just did mine, http://noypi-linux.blogspot.com/2013/05/build-jquery-with-ajax-only.html

you only need these 1 files (resulting minified is about 30Kb):

/d/dev/javascript/jquery/jquery/src/intro.js
/d/dev/javascript/jquery/jquery/src/core.js
/d/dev/javascript/jquery/jquery/src/callbacks.js
/d/dev/javascript/jquery/jquery/src/deferred.js
/d/dev/javascript/jquery/jquery/src/support.js
/d/dev/javascript/jquery/jquery/src/data.js
/d/dev/javascript/jquery/jquery/src/event.js
/d/dev/javascript/jquery/jquery/src/serialize.js
/d/dev/javascript/jquery/jquery/src/ajax.js
/d/dev/javascript/jquery/jquery/src/ajax/xhr.js
/d/dev/javascript/jquery/jquery/src/exports.js
 /d/dev/javascript/jquery/jquery/src/outro.js

You can try AJAJ. It's a very tiny(less than 3 1kb gzipped) library to make ajax calls. And 2 its syntax is very similar to jQuery.

For 1 example:

ajaj({
  method: "POST",
  url: "/path/to/request",
  data: {
    name: "AJAJ",
    version: "1.0.0",
  },
  success: function (data) {
    console.log(data);
  },
  fail: function (error) {
    console.log(error);
  },
});

It's all or nothing. Of course jquery is 7 open source and you could extract the part 6 you are interested in in your own library 5 (good luck with this). You may consider 4 using a CDN which will ensure that most 3 users will already have it cached in their 2 browsers so you shouldn't be concerned about 1 size.

There is none out of the box but you can 7 of course cut and paste from the existing 6 file and then minimize it.

If you are just 5 worried about the size of the library serving 4 it from a CDN from Google, MS or jQuery 3 will probably require less data traffic 2 as most browsers already have the files 1 cached.