typewrite.js

A flexible typewriter simulator written in plain Javascript, well tested using Mocha, Chai, Karma and Istanbul. Demo

Install

npm install typewrite

Or download typewrite.min.js.

After that just add the script to your HTML document and start typewriting...

<span id="typewrite"></span>

<script src="js/typewrite.min.js"></script>
<script type="text/javascript">
typewrite('#type')
  .setDelay(100, true)
  .type('lOREM IPSUM ')
  .setDelay(50, false)
  .pause(5)
  .clear()
  .setDelay(50, true)
  .type('Lorem ipsum dolor sit amet, consetetur sadipscing elitr.\nSEd ')
  .setDelay(100, true)
  .pause(5)
  .backspace(3)
  .type('ed diam nonumy eirmod tempor invidunt ')
  .pause(10)
  .setDelay(75, true)
  .type('\nut labore et dolore magna aliquyam erat.');
</script>

If you want to add an animated blinking cursor, just add the following CSS rules:

.typewrite-cursor{
  font-weight: 400;
  opacity: 1;
  -webkit-animation: blink 0.95s infinite;
  -moz-animation: blink 0.95s infinite;
  -ms-animation: blink 0.95s infinite;
  -o-animation: blink 0.95s infinite;
  animation: blink 0.95s infinite;
}

@-keyframes blink{
  0% { opacity:1; }
  50% { opacity:0; }
  100% { opacity:1; }
}
@-webkit-keyframes blink{
  0% { opacity:1; }
  50% { opacity:0; }
  100% { opacity:1; }
}
@-moz-keyframes blink{
  0% { opacity:1; }
  50% { opacity:0; }
  100% { opacity:1; }
}
@-ms-keyframes blink{
  0% { opacity:1; }
  50% { opacity:0; }
  100% { opacity:1; }
}
@-o-keyframes blink{
  0% { opacity:1; }
  50% { opacity:0; }
  100% { opacity:1; }
}

API

Each of the following methods return a typewrite object which allows method chaining.

typewrite

object typewrite(DOMString/DOMElement element)

Returns a typewrite object which provides the methods listed below. The element argument can be either a selector or a DOM element. This argument is needed to identify the destination of the animation. This method is the starting point for a typewriter simulation.

Example

var tw = typewrite('#type');

type

object type(string text)

Types the value of text.

Example

typewrite('#type').type('Lorem ipsum');

backspace

object backspace([number count])

Backspaces a number of characters provided by count. If count is omitted, only the last character will be backspaced.

Example

typewrite('#type').type('Lorem ipsum').backspace(3);

clear

object clear()

Backspaces all characters.

Example

typewrite('#type').type('Lorem ipsum').clear();

setDelay

object setDelay(number delay, [boolean humanize])

Sets the number of milliseconds that each character should be delayed by. The delay argument accepts any positive decimal number. If the humanize argument is set to true, the delay is being humanized by adding a random amount of milliseconds. humanize defaults to true, if omitted. Unless this method is being called, the delay defaults to 100 and is being humanized.

Example

typewrite('#type').setDelay(100).type('Lorem ipsum').setDelay(50, false).clear();

pause

object pause(number time)

Pauses for an amount of time, which is being calculated by the time it takes to type a character (set on setDelay()) multiplied by time which accepts a positive decimal number.

Example

typewrite('#type').setDelay(100).type('Lorem ipsum').setDelay(50, false).clear();

then

object then(function callback)

Execute function callback asynchronously.

Example

typewrite('#type').type('Lorem ipsum').then(alert.bind(window, 'The end.'));

Development

The following gulp tasks are provided.

Compress

gulp compress

Compress js/typewrite.js and copy to js/typewrite.min.js.

Test

gulp test

Execute Mocha/Chai tests once in several browsers using Karma and process code coverage recording using Istanbul.

gulp test:chrome

Execute Mocha/Chai tests once in Chrome using Karma and process code coverage recording using Istanbul.

gulp test:firefox

Execute Mocha/Chai tests once in Firefox using Karma and process code coverage recording using Istanbul.

gulp test:Safari

Execute Mocha/Chai tests once in Safari using Karma and process code coverage recording using Istanbul.

gulp test:Opera

Execute Mocha/Chai tests once in Opera using Karma and process code coverage recording using Istanbul.

gulp test:ie

Execute Mocha/Chai tests once in Internet Explorer using Karma and process code coverage recording using Istanbul.

TDD

gulp tdd

Watch changes to js/typewrite.js or test/tests.js, execute Mocha/Chai tests immediately in Chrome using Karma and process code coverage recording using Istanbul.

License

MIT © Olaf Ennen