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‎README.md‎

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# jquery.stepper.js
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> Lightweight input stepper for real world usage. [Check it out on JSFiddle](http://codepen.io/anon/pen/ZONpxW?editors=0010)
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## Features
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- Works on input type="text"
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- Only supports positive integers (0 - Infinity)
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- Set initial values in the markup or Javascript
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- Optionally configure min/max values with attributes
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- Supports keyboard interaction (increase/decrease by 10 by holding shift)
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- Enables number pad on mobile browsers
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## Install
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Download and include the javascript file.
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```html
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<script src="jquery.stepper.js"></script>
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<link href="style.css" media="all" rel="stylesheet" />
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```
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## Basic usage
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Check out `index.html` for all examples.
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```html
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<div class="stepper" id="stepper_1">
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<div class="stepper-progress"></div>
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<input type="text" class="stepper-number">
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</div>
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```
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Call the input stepper plugin on the desired selector
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```javascript
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$(function () {
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// Document ready
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$('#stepper_1').stepper();
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});
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```
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## Advanced usage
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```html
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<div class="stepper" id="stepper_2">
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<div class="stepper-progress"></div>
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<input type="text" class="stepper-number" min="10" max="90">
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</div>
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```
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Call the input stepper plugin on the desired selector
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```javascript
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$('#stepper_3').stepper({
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selectorProgressBar: '.stepper-progress',
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selectorInputNumber: '.stepper-number',
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classNameChanging: 'is-changing',
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decimals: 2,
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unit: 'px',
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initialValue: 50,
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min: -200,
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max: 200,
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stepSize: 5
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});
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```
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## Default settings
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The input stepper can be called with a number of options. The defaults of each option are listed below
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```javascript
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$('.input-stepper').inputStepper({
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// Values in the markup always overwrite this settings
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// min and max value can be overridden with the attribute on the input text
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initialValue: null,
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min: 0,
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max: 100
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// The selector for the input
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selectorInputNumber: '.stepper-number',
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// The selector for the progress bar
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selectorProgressBar: '.stepper-progress',
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// The class used when you have the focus+moving the cursor on the input text field
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classNameChanging: 'is-changing',
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// Number of decimals to display
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decimals: 2,
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// unit to concatenate with the value result
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unit: 'px',
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// Step used to increaste the progress bar.
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// Increase this value if you have a big range. Reduce the value (ex : .25) if you have a small range
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stepSize: 1
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});
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```

‎index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>input stepper examples</title>
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<link href="style.css" media="all" rel="stylesheet" />
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</head>
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<body>
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<h1>jquery.stepper.js</h1>
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<div style="width:150px">
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<div class="stepper" id="stepper_1">
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<div class="stepper-progress"></div>
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<input type="text" class="stepper-number" min="10" max="90">
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</div>
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<br>
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<div class="stepper" id="stepper_2">
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<div class="stepper-progress"></div>
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<input type="text" class="stepper-number">
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</div>
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<br>
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<div class="stepper" id="stepper_3">
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<div class="stepper-progress"></div>
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<input type="text" class="stepper-number">
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</div>
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</div>
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<hr>
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<script src="http://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
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<script src="jquery.stepper.js"></script>
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<script>
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$(function () {
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// Document ready
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$('#stepper_1').stepper();
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$('#stepper_2').stepper();
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$('#stepper_3').stepper({
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selectorProgressBar: '.stepper-progress',
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selectorInputNumber: '.stepper-number',
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classNameChanging: 'is-changing',
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decimals: 2,
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unit: 'px',
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initialValue: 50,
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min: -200,
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max: 200,
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stepSize: 5
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});
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});
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</script>
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</body>
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</html>

‎jquery.stepper.js‎

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// jquery.stepper.js
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// ------------------------------------------------------
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// Author: NCOU
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;(function (root, $, undefined) {
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var pluginName = "stepper";
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var defaults = {
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selectorProgressBar: '.stepper-progress',
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selectorInputNumber: '.stepper-number',
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classNameChanging: 'is-changing',
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decimals: 0,
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unit: '%',
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initialValue: null,
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min: 0,
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max: 100,
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stepSize: 1
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};
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// The actual plugin constructor
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function Plugin( element, options ) {
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this.element = element;
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this.options = $.extend( {}, defaults, options) ;
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this._defaults = defaults;
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this._name = pluginName;
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return this.init();
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}
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Plugin.prototype = {
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init: function () {
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// local variable
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this.curDown = !0;
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this.mouseDownX = 0;
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this.mouseDownValue = 0;
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// Cache elements
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this.$el = $(this.element);
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this.$input = this.$el.find(this.options.selectorInputNumber);
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this.$progress = this.$el.find(this.options.selectorProgressBar);
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this.min = this.$input.attr('min') || this.options.min;
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this.max = this.$input.attr('max') || this.options.max;
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this.initialValue = this.getValue() || this.options.initialValue || this.max;
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this.setValue(this.initialValue);
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// Bind events
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this.$input.on('blur', this.onBlur.bind(this) );
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this.$input.on('change keyup paste input', this.onChange.bind(this) );
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this.$el.on('mousedown', this.onMouseDown.bind(this) );
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$(document).on('mouseup', this.onMouseUp.bind(this) );
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$(document).on('mousemove', this.onMouseMove.bind(this) );
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return this;
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},
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onMouseDown: function (e) {
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this.mouseDownX = e.clientX;
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this.mouseDownValue = this.getValue();
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this._changeStart();
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return this;
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},
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onMouseUp: function (e) {
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this._changeEnd();
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return this;
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},
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onMouseMove: function (e) {
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if (this.curDown === !1) {
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var t = e.clientX - this.mouseDownX;
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this.setValue(this.mouseDownValue + t * this.options.stepSize);
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}
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return this;
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},
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onChange: function (e) {
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var r = this._valueToPercent(this.getValue()) / 100;
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this.$progress.css("transform", "scaleX(" + r + ")");
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return this;
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},
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onBlur: function (e) {
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this._changeEnd();
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this.setValue(this.getValue());
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return this;
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},
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getValue: function () {
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return parseFloat(this.$input.val()) || 0;
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},
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setValue: function (amount) {
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var value;
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value = Math.max(Math.min(amount, this.max), this.min);
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value = this._roundValue(value);
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var n = value;
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n = n.toFixed(this.options.decimals);
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n += this.options.unit;
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this.$input.val(n);
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var r = this._valueToPercent(value) / 100;
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this.$progress.css("transform", "scaleX(" + r + ")")
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return this;
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},
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_percentToValue: function (v) {
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return this.min + v / 100 * (this.max - this.min);
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},
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_valueToPercent: function (v) {
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var t = (v - this.min) / (this.max - this.min) * 100;
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return Math.max(Math.min(t, 100), 0);
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},
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_roundValue: function (v) {
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var nbrDecimals = 2;
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var t = Math.pow(10, nbrDecimals);
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return Math.round(v * t) / t
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},
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_changeStart: function() {
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this.curDown = !1;
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this.$el.addClass("is-changing");
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},
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_changeEnd: function() {
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this.curDown = !0;
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this.$el.removeClass("is-changing");
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},
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};
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// A really lightweight plugin wrapper around the constructor,
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// preventing against multiple instantiations
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$.fn[pluginName] = function ( options ) {
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return this.each(function () {
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if ( ! $.data(this, "plugin-" + pluginName)) {
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$.data(this, "plugin-" + pluginName,
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new Plugin( this, options ));
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}
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});
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};
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})(window, jQuery);

‎style.css‎

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* {
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-moz-box-sizing: border-box;
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box-sizing: border-box;
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}
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div {
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display: block;
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}
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.stepper {
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position: relative;
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width: 100%;
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height: 30px;
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background: #4e4e4e;
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border: 1px solid #292929;
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cursor: col-resize;
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}
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.stepper .stepper-number:focus {
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outline: 1px solid #1baee1;
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//cursor: text
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}
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.stepper-progress {
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position: absolute;
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bottom: 0;
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left: 0;
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width: 100%;
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height: 2px;
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background-color: rgba(255, 255, 255, 0.2);
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-webkit-transform-origin: 0 0;
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-ms-transform-origin: 0 0;
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transform-origin: 0 0;
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-webkit-transition: background-color 0.1s linear;
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transition: background-color 0.1s linear;
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}
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.stepper-number {
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position: relative;
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width: 100%;
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height: 28px;
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line-height: 28px;
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padding: 0 6px;
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color: #fff;
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background: transparent;
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border: 0;
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outline: 0;
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outline-offset: 0;
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cursor: col-resize;
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z-index: 2;
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}
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.stepper.is-changing .stepper-progress {
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background-color: #1baee1;
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}
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.stepper.is-scrubbing {
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background: rgba(255, 255, 255, 0.8)
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}

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