vue-typer

Vue component that simulates a user typing, selecting, and erasing text.

Play with vue-typer in this interactive demo.

• Getting Started
• Usage
• Props
  • text
  • repeat
  • shuffle
  • initialAction
  • preTypeDelay
  • typeDelay
  • preEraseDelay
  • eraseDelay
  • eraseStyle
  • eraseOnComplete
  • caretAnimation
• Events
  • typed
  • typed-char
  • erased
  • completed
• Styles
• Contribution Guide
• Changelog
• TODO
• License

Getting Started

VueTyper has a single dependency to lodash.split to support emojis and other multi-codepoint Unicode characters. Apart from this, VueTyper does not have any direct dependencies to any other library or framework -- not even to Vue itself! All required Vue API calls are made through Vue's this.$* context methods. This means VueTyper can only execute within a Vue application context, but in exchange, it does not need to pull in Vue, which keeps VueTyper lightweight.

Prerequisites

• Vue v2.x
  • VueTyper has not been tested in Vue v1.x. (See here for migration instructions from Vue 1.x to 2.x.)

Installation

npm

Use this method if you wish to import/require VueTyper as a module.

npm install --save vue-typer

CDN

Use this method if you wish to access VueTyper globally via window.VueTyper.

<script src="https://unpkg.com/vue-typer/dist/vue-typer.min.js"></script>

Usage

After installing VueTyper, you may choose to register it either globally or locally. What's the difference? See the Vue documentation here.

Local Registration

1. Import the VueTyper component directly from your Vue component file:

// ES6
import { VueTyper } from 'vue-typer'
// CommonJS
var VueTyper = require('vue-typer').VueTyper
// Global
var VueTyper = window.VueTyper.VueTyper

1. Register it as a local component in your Vue component options:

var MyComponent = {
  // ...
  components: {
    // ES6; property shorthand + Vue should automatically dasherize the key for us
    VueTyper
    // pre-ES6
    'vue-typer': VueTyper
  }
}

1. Use vue-typer in your Vue component's template:

<vue-typer text='Hello World! I was registered locally!'></vue-typer>

Global Registration

1. Import the VueTyper plugin in your application entry point:

// ES6
import VueTyperPlugin from 'vue-typer'
// CommonJS
var VueTyperPlugin = require('vue-typer').default
// Global
var VueTyperPlugin = window.VueTyper.default

1. Register the VueTyper plugin with Vue

Vue.use(VueTyperPlugin)

1. Now you can freely use vue-typer in any Vue component template:

<vue-typer text='Hello World! I was registered globally!'></vue-typer>

Props

It may be helpful to play around with these props in the interactive demo.

text

• type: String || Array

• required

• validator: Non-empty

• Usage:

  <vue-typer text='watermelon'></vue-typer>

  Either a single string, or an ordered list of strings, for VueTyper to type. Strings will not be trimmed.

• Note: Dynamically changing this value after VueTyper has mounted will cause VueTyper to reset itself and start typing from scratch.

• See also: shuffle

repeat

• type: Number

• default: Infinity

• validator: Non-negative

• Usage:

  <vue-typer text='watermelon' :repeat='0'></vue-typer>

  Number of extra times to type text after the first time. Setting 0 will type text once; 1 will type twice; Infinity will type forever.

• Note: Dynamically changing this value after VueTyper has mounted will cause VueTyper to reset itself and start typing from scratch.

shuffle

• type: Boolean

• default: false

• Usage:

  <vue-typer text='watermelon' :shuffle='true'></vue-typer>

  Randomly shuffles text (using the Fisher-Yates shuffle) before typing it. If repeat > 0, text will always be shuffled before repeated typings. text is not shuffled after every word is typed. This implies that:

  • all strings in text will be typed the same number of times, but just in a shuffled order
  • the frequencies of the order of strings typed will have equal distributions, e.g.:
    • given text=['a','b'], a,b will be printed 50% of the time, and b,a the other 50%
    • given text=['a','b','c'], there are 3!=6 possible permutations, and they will each be printed 100%/6=16.7% of the time
  • the only scenarios where the same word can be typed twice in a row are when:
    1. text contains duplicate strings, or
    2. repeat > 0, text is typed where the last word is W, and the next repeat typing shuffled text such that it starts with W.

• Note: Dynamically changing this value after VueTyper has mounted will cause VueTyper to reset itself and start typing from scratch.

initialAction

• type: String

• default: "typing"

• validator: "typing" || "erasing"

• Usage:

  <vue-typer text='watermelon' initial-action='erasing'></vue-typer>

  typing starts VueTyper off in the "typing" state; there will be empty space as VueTyper begins to type the first string in text.

  erasing starts VueTyper off in the "erasing" state; the first string in text will already be typed and visible as VueTyper begins to erase it.

preTypeDelay

• type: Number

• default: 70

• validator: Non-negative

• Usage:

  <vue-typer text='watermelon' pre-type-delay='1000'></vue-typer>

  Milliseconds to wait before typing the first character of every string in text.

  This is useful to have an idle period to show a blank space for a period of time before VueTyper types the first character.

typeDelay

• type: Number

• default: 70

• validator: Non-negative

• Usage:

  <vue-typer text='watermelon' type-delay='100'></vue-typer>

  Milliseconds to wait after typing a character, until the next character is typed.

preEraseDelay

• type: Number

• default: 2000

• validator: Non-negative

• Usage:

  <vue-typer text='watermelon' pre-erase-delay='1000'></vue-typer>

  Milliseconds to wait after a string is fully typed, until the first erase action (i.e. backspace, highlight) is performed.

  This is useful to have an idle period that gives users time to read the typed string before it is erased.

eraseDelay

• type: Number

• default: 250

• validator: Non-negative

• Usage:

  <vue-typer text='watermelon' erase-delay='70'></vue-typer>

  Milliseconds to wait after performing an erase action (i.e. backspace, highlight), until the next erase action can start.

eraseStyle

• type: String

• default: "select-all"

• validator: "backspace" || "select-back" || "select-all" || "clear"

• Usage:

  <vue-typer text='watermelon' erase-style='backspace'></vue-typer>

  backspace erases one character at a time, simulating the backspace key.

  select-back highlights backward one character at a time, simulating Shift+LeftArrow, and erases everything once all characters are highlighted.

  select-all immediately highlights all characters at once, simulating Ctrl/Cmd+A, and erases all characters afterwards.

  clear immediately erases all characters at once; the typed string simply disappears.

eraseOnComplete

• type: Boolean

• default: false

• Usage:

  <vue-typer text='watermelon' :erase-on-complete='true'></vue-typer>

  By default, after VueTyper completes all its typing (i.e. it finishes typing all strings in text, repeat+1 times), the last typed string will not be erased and stay visible. Enabling this flag will tell VueTyper to erase the final string as well.

• Note: Has no effect if repeat === Infinity.

caretAnimation

• type: String

• default: "blink"

• validator: "solid" || "blink" || "smooth" || "phase" || "expand"

• Usage:

  <vue-typer text='watermelon' caret-animation='smooth'></vue-typer>

  Specifies a built-in caret animation to use, similar to Sublime and VS Code animations.

• Note: Alternatively, custom animations can be applied via CSS.

• See also: Styles, Example Custom Caret Animation

Events

typed

• Event data:

  • String typedString

• Usage:

  <vue-typer text='watermelon' @typed='onTyped'></vue-typer>

  {
    ...
    methods: {
      onTyped: function(typedString) {
        // handle typed string
      }
    }
  }

  Emitted everytime VueTyper finishes typing a string.

typed-char

• Event data:

  • String typedChar
  • Number typedCharIndex

• Usage:

  <vue-typer text='watermelon' @typed-char='onTypedChar'></vue-typer>

  {
    ...
    methods: {
      onTypedChar: function(typedChar, typedCharIndex) {
        // handle typed character at the given index
        // call #1: 'w', 0
        // call #2: 'a', 1
        // call #3: 't', 2
        // ...
      }
    }
  }

  Emitted everytime VueTyper finishes typing a single character.

erased

• Event data:

  • String erasedString

• Usage:

  <vue-typer text='watermelon' @erased='onErased'></vue-typer>

  {
    ...
    methods: {
      onErased: function(erasedString) {
        // handle erased string
      }
    }
  }

  Emitted everytime VueTyper finishes erasing a string.

completed

• Usage:

  <vue-typer text='watermelon' @completed='onComplete'></vue-typer>

  {
    ...
    methods: {
      onComplete: function() {
        // handle event when VueTyper has finished all typing/erasing
      }
    }
  }

  Emitted when VueTyper has finished typing all words in text, repeat+1 times.

• Note: If eraseOnComplete is enabled, the final typed string must also be erased before this event is emitted.

Styles

To keep the separation of concern between component code and styles, VueTyper can be fully styled through CSS (as opposed to props).

The following is a skeleton selector structure to override the style of each component of VueTyper.

• Usage:

  /* SCSS */
  .vue-typer {
    /* Styles for the vue-typer container
       e.g. font-family, font-size  */
   
    .custom.char {
      /* Styles for each character
         e.g. color, background-color */
   
      &.typed {
        /* Styles specific to typed characters
           i.e. characters to the left of the caret */
      }
      &.selected {
        /* Styles specific to selected characters
           i.e. characters to the right of the caret while VueTyper's
                'eraseStyle' is set to a selection-based style */
      }
      &.erased {
        /* Styles specific to erased characters
           i.e. characters to the right of the caret while VueTyper's
                'eraseStyle' is set to a non-selection-based style */
      }
    }
   
    .custom.caret {
      /* Styles for the caret
         e.g. background-color, animation, display */
   
      &.pre-type {
        /* Styles for the caret when it is idle before typing
           i.e. before a string starts being typed, during 'preTypeDelay' */
      }
      &.pre-erase {
        /* Styles for the caret when it is idle before erasing
           i.e. before a string starts being erased, during 'preEraseDelay' */
      }
      &.idle {
        /* Styles for the caret when it is idle, but VueTyper has not yet completed typing
           i.e. when 'pre-type' or 'pre-erase' is set, but not 'complete' */
      }
      &.typing {
        /* Styles for the caret while VueTyper is typing
           i.e. when the caret is moving forwards */
      }
      &.selecting {
        /* Styles for the caret while VueTyper is selecting
           i.e. when the caret is moving backwards and 'eraseStyle' is
           set to a selection-based style */
      }
      &.erasing {
        /* Styles for the caret while VueTyper is erasing
           i.e. when the caret is moving backwards and 'eraseStyle' is
           set to a non-selection-based style */
      }
      &.complete {
        /* Styles for the idle caret when VueTyper has finished all typing/erasing */
      }
    }
  }

• Note: Some of the default styles above make things hidden using display: none;. If you wish to make it visible again, use display: inline-block;. Do not use block.

• See also: CSS Examples

Contribution Guide

1. Make all changes on the develop branch.
2. Update the demo page to showcase new APIs or features.
3. Add unit tests.
4. Update this README if necessary.
5. Submit a PR!

Changelog

Changes for each release will be documented here.

TODO

• Update to latest webpack
• Remove Bootstrap usage in demo app
• Consider marking lodash.split as a peer dependency via webpack externals (webpack-node-externals may be overkill?)
• Revisit community discussions around the best way to obtain deterministic hashes so we can remove HashedModuleIdsPlugin
• Potential features (pull requests are welcome!):
  • start typing only when VueTyper is on-screen; potentially pause typing when off-screen
  • smarter typing algorithm: erase only up to the longest common starting substring
  • is it worth it to eliminate time-drifting from setInterval? If so, it could be a self-correcting interval (implemented as a series of timeouts)
  • See submitted feature requests
• Vue documentation considers rendering-specific tests to still be 'unit' tests. Should we split this out into 'integration' tests?

License

MIT

Copyright © 2016-Present, Chris Nguyen. All rights reserved.