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                <div id="app">
  <h1><strong>Scrubber</strong> for Vue.js</h1>
  <p>Use your mouse to drag over any scrubber field to change its value, type a value or use arrow up/down to increase/decrease the value.</p>
  <p>A scrubber is constrained by minimum & maximum values. Steps define the granularity of change.</p>
  <p><strong>Use: </strong><code>{{ demo }}</code></p>

  <div class="parameters">


    <label for="">
      <scrubber :value="value" :min="min" :max="max" :steps="steps"></scrubber>           </label>


  <div class="parameters">

    <label for="">
      <scrubber :value.sync="min" :min="0" :max="max" :steps="1">  </scrubber>

    <label for="">
      <scrubber :value.sync="max" :min="0" :steps="2"></scrubber>

    <label for="">
      <scrubber :value.sync="steps" :min="0" :max="10" :steps="0.1"></scrubber>



                .vue-scrubber {
  font-size: 15px;
  padding: 0.5em;
  border: 0;

  cursor: ew-resize;
  background: rgba(0, 0, 0, 0.08);
  color: white;
  -webkit-user-select: none;
font-feature-settings:"lnum" 1;

.vue-scrubber:hover, .vue-scrubber:focus {
  outline: 0;
  box-shadow: none;

/** Demo CSS */

body {
  font-family: "Helvetica Neue", "Arial", sans-serif;
  background: #6247AA;
  color: #E2CFEA;
  -webkit-font-smoothing: antialiased;
  padding: 2rem;
  max-width: 800px;
  margin: 0 auto;

h1 {
  font-weight: 100;
  letter-spacing: 2px;

h1 strong {
  letter-spacing: 0;
p {
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
  opacity: 0.8;
  font-size: 1rem;

.parameters {
  margin-top: 4rem;
  background: #6247AA;

label {
  display: block;
  margin-bottom: 2rem;

label span {
  display: inline-block;
  width: 100px;

code {
  font-family: "Monaco", monospaced;
  font-size: 15px;


                // Scrubber component
// Lets the user change an input field value by dragging the mouse left/right.
// Manual text input is still possible.

Vue.component('scrubber', {
  data: function() {
    return {
      isMouseDown: false,
      initialMouse: null,
      value: 0
  computed: {
    // returns the number of decimals based on the step value
    // e.g. "0.25" returns "2"
    decimals: function() {
      return this.steps.toString().substr((this.steps).toString().indexOf(".")).length - 1;
    // every time the value changes, we need to make sure it stays inside the min/max
    constrainedValue: function() {
      return this.constrain(this.value, this.min, this.max, this.decimals);
  // props that the scrubber can receive
  // value: initial value
  // min: minimum value
  // max: maximum value
  // steps: increments for each pixel the mouse is moved
  props: ["value", "min", "max", "steps"],
  // the template
  template: "<input class='vue-scrubber' v-model='constrainedValue' v-on:mousedown='handleMouseDown' v-on:keypress='handleInput' v-on:keydown.up='handleKeyCodeUp' v-on:keydown.down='handleKeyCodeDown' v-on:change='handleChange' />",

  methods: {
    // constrains a number to not exceed the min/max
    // decimals: rounding precision
    constrain: function(value, min, max, decimals) {
      decimals = typeof decimals !== 'undefined' ? decimals : 0;

      if (min != undefined && max != undefined) {
        return this.round(Math.min(Math.max(parseFloat(value), min), max), decimals);
      } else {
        return value;
    // method to round a number to given decimals
    round: function(value, decimals) {
      return Number(Math.round(value + 'e' + decimals) + 'e-' + decimals);
    handleInput: function (event) {
      // only allow numeric keys
      if (event.keyCode < 48 || event.keyCode > 57) {
    handleChange: function (event) {

      this.value = isNaN(parseFloat( ? 0 : parseFloat(;
    handleKeyCodeUp: function (event) {
        this.value += parseFloat(this.steps);
    handleKeyCodeDown: function (event) {
        this.value -= parseFloat(this.steps);
    // mouse handler
    handleMouseDown: function(event) {

      // enable scrubbing
      this.mouseDown = true;

      // remember the initial mouse position when the scubbing started
      this.initialMouse = {
        x: event.clientX,
        y: event.clientY

      // remember the initial value
      this.initialValue = this.value;

      // register global event handlers because now we are not bound to the component anymore
      document.addEventListener("mousemove", this.handleMouseMove)

      // global mouse up listener
      document.addEventListener("mouseup", this.handleMouseUp)
    handleMouseUp: function($event) {

      // disable scrubbing
      this.mouseDown = false;
      document.removeEventListener("mousemove", this.handleMouseMove)
      document.removeEventListener("mouseup", this.handleMouseUp)

    // the actual translation of mouse movement to value change…
    handleMouseMove: function(event) {

      // scrub if the mouse is being pressed
      if (this.mouseDown) {
        var newValue = this.initialValue + ((event.clientX - this.initialMouse.x) * this.steps)

        // constrain the value to the min/max
        this.value = this.constrain(newValue, this.min, this.max, this.decimals);


// demo app with global data properties that get passed down the a few scrubbers

var app = new Vue({
  el: "#app",
  data: {
    min: 0,
    max: 200,
    steps: 1,
    value: 100,
    demo: "<scrubber :min='10' :max='100' :steps='1' :value='50'></scrubber>"