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TFUZ JS - A Tiny JavaScript Utility Library


What is it?

A tiny ~7kb extendable JavaScript utility library with a JQuery like syntax for getting work done fast!

If you are looking for small footprint utility library with a syntax similar to JQuery, TFUZ may be just what you need.

Get TFUZ at
Visit for ongoing documentation and examples.


  • Tiny! - currently under ~7KB minified (smaller if gzipped).
  • Can be used as a general purpose JQuery like library.
  • Easy familiar syntax with built-in chainable DOM manipulation methods.
  • Built-in iterable delay queue for building your effects.
  • Ability set up custom observers on any element.
  • And more ...


Not every site uses React (and friends) and not every site needs all the features that require loading the full JQuery library.

TFUZ is the pagespeed conscious web developer's best friend. It's super small and easy to extend.

Sure you could write everything TFUZ has to offer in Vanilla JavaScript but TFUZ is so small and the syntax is familiar and easy to remember that it can potentially save you time / development costs.

TFUZ is your tiny tool belt of most used DOM manipulation tools with some really cool extra bits.

If TFUZ doesn't have what you need you can easily add it!

Basic Usage

  • Basic usage for manually adding and using TFUZ to a web page.

Add TFUZ to your page before your closing body tag :

<script src=''></script>

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Use TFUZ like you would JQuery

  • In an html file:
// somewhere in your html

<div id='app'> I am an App </div>
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  • In a script tag after tfuz.min.js add:
// create a wrapper function to hold all the stuff you want to do:
function init(){

// Select an element and return a reference to it using "grab"
// there are many options to "grab" but this minimal use returns a reference
// to the first element (so you don't keep querying the DOM) of #app by default

let app = tfuz.grab('#app');
app.css('color: red;'); // changes app's color with CSS

// Run your wrapper function when the document is ready...

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Add your own functionality and make plugins!

  • In your same script file from above add:
function myplug(){
this.css('color: red;');
return this;

//  Now tell TFUZ to use the plugin:                  
// *** Note you must tell TFUZ to use plugins at the top of your script file before initalizing anything else. 

tfuz.use({name: 'myplug', fn: myplug}); // add to top of your init/wrapper function.

// Use the new plugin wherever you want later:

app.myplug(); // use plguin after reference to app was "grabbed";

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Some TFUZ Methods - *For help read the function signatures in the code or contact me!

  • append - el.append('text or html') - append to bottom of el.
  • appendTo - el.appendTo('.otherEl' or el.appendTo(Elvar) - append to first of selector or to reference.
  • prependTo - Same as appendTo but prepends to silly.
  • grab - tfuz.grab (query document) or el.grab('selector', {all: false, fn: func}) (query starting from element) - short hand for each that will run function and return found collection (first found by default).
  • each- el.each({sel, 'selector1, selector2', all: true, fn: func}) - run function on collection of selectors.
  • select -{sel, 'selector1, selector2', first: false, fn: func}) - run function on collection of selectors and return collection.
  • ready - tfuz.ready(func) - run function when document is ready
  • css - el.css('color: blue;') OR el.css('color: blue;', { add = false } ) to overwrite CSS, true by default to add to current CSS)
  • html - el.html() to return html, el.html('some new html here') to set html.
  • _text- el._text() to return text, el._text('some new text here') to set text - *prefixed with underscore because anchor tags have a text property that you can't overwrite.
  • plg - add a new plugin.
  • fn - alias to plg.
  • use - alias to plg.
  • on - el.on('click', func) - adds an event listener.
  • off -'click', func) - removes event listener created by on.
  • trigger - trigger an event created with on.
  • observe- listen for changes on elements - read code!
  • unobserve - stop observing observers of elements created by observe.
  • getobservers - Get list of observers
  • scroll - tfuz.scroll(func) - run function on scroll.
  • attr - get or set attributes of el.
  • removeAttr - el.removeAttr('attr') - remove attributes of el
  • addClass - el.addClass('classname list');
  • removeClass - el.removeClass('classlist');
  • toggle - toggle on or off a class
  • rpx - remove px, em from numbers and return number.
  • cs - return computed values.
  • isString - return boolean if is a string.
  • isFunction - return boolean if is a function.
  • isObject - return boolean is an Object.
  • isArray - return boolean if is an array.
  • isElement - return bollean if is an Element.
  • isNumber -return boolean if is a number.
  • isEmpty - return boolean if empty object.
  • createNode - create Node and optionall append or prepend to caller.
  • delay - iterate-able delay queue - el.delay({time: 1000, fn: yourFunc, iterate: 6 }); - runs yourFunc every second for 6 iterations - chained delays are queued and ran in order until queue is empty..

Delay Example

  // Create a normal function - as an example this function will increase a counter
  function delayCount(e){
       e.countme = 0;
      e.templateHTML = e.html(); // save original html for future iterations
   console.log('Count is '+e.countme);
   e.html(e.templateHTML + ' '+e.countme)

// call delay from app and watch the magic happen as the count up to 6 is appended to the existing html.
  app.delay({time: 1000, fn: delayCount, iterate: 6 }); // chain more delays here if you want.

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Now that you know about delay, you can build your own effects!

TFUZ doesn't come with effects, that helps keep the code small. But you can build your own!

We will build FadeOut and FadeIn.

// First create the functions we will call with an iterate-able delay
// fadeOut

function fadeOut(e,options){
let op =  e.cs('opacity');
let itr = '0.'+options.iterationsLeft;
itr = Number(itr)
e.css(`opacity: ${itr};`);

// FadeIn

function fadeIn(e){
let op =  e.cs('opacity');
if(op < 1){
op = Number( op ) + 0.1
if(op >= 0.9){
op = 1
op = op.toFixed(1);
e.css(`opacity: ${op};`);

// Now use delay to run your new fade functions

fader.delay({time: 100, fn: fadeOut, iterate: 10 });
fader.delay({time: 100, fn: fadeIn, iterate: 10 });

// You could wrap the above delay calls in a function... like fadeInOut() then call fadeInOut on click or wherever you want.

function fadeInOut(){
fader.delay({time: 100, fn: fadeOut, iterate: 10 });
fader.delay({time: 100, fn: fadeIn, iterate: 10 });

// call fadeInOut on click event

fader.on('click', fadeInOut);

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Get TFUZ, fork and make improvements on

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