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index.js
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index.js
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/**
* Module dependencies
*/
var query = require('query');
var domify = require('domify');
var events = require('events');
var Emitter = require('emitter');
var translate = require('translate');
var constrain = require('constrain');
var template = require('./template');
/**
* Expose `Sldr`
*/
module.exports = Sldr;
/**
* Initialize `Sldr`
*
* @param {Number} initial value (Optional)
* @param {Number} min value (Optional)
* @param {Number} max value (Optional)
*
*/
function Sldr(value, min, max){
this.el = domify(this.template);
this.wrapEl = query('.wrap', this.el);
this.valueEl = query('.label-value', this.el);
this.gaugeEl = query('.gauge', this.el);
this.minEl = query('.label-min', this.el);
this.maxEl = query('.label-max', this.el);
this._min = min || 0;
this._max = max || 100;
this._value = constrain(value || 0, this._min, this._max);
this.skipEmit = false;
this.bind();
}
/**
* Emitter
*/
Emitter(Sldr.prototype);
/**
* Template
*/
Sldr.prototype.template = template;
/**
* Bind dom events
*
* @api private
*/
Sldr.prototype.bind = function() {
this.events = events(this.el, this);
this.bodyEvents = events(document.body, this);
this.events.bind('mousedown', 'touchstart');
this.events.bind('touchstart', 'touchstart');
};
/**
* Unbind all the DOM events and remove all the listeners
* @api private
*/
Sldr.prototype.unbind = function() {
this.events.unbind();
this.bodyEvents.unbind();
this.off();
};
/**
* Mousedown or touchstart event handler
* @param {Event}
*
* @api private
*/
Sldr.prototype.touchstart = function(e) {
e.preventDefault();
this._width = this.el.clientWidth;
this._left = this.el.offsetLeft;
var percentage = constrain((e.pageX - this._left) / this._width, 0, 100);
this.value(percentage * (this._max - this._min));
this.bodyEvents.bind('mousemove', 'touchmove');
this.bodyEvents.bind('mouseup', 'touchend');
this.bodyEvents.bind('touchmove', 'touchmove');
this.bodyEvents.bind('touchend', 'touchend');
};
/**
* Mousemove or touchmove event handler bound to body
* @param {Event}
*
* @api private
*/
Sldr.prototype.touchmove = function(e) {
e.preventDefault();
this.el.classList.add('is-active');
var percentage = constrain((e.pageX - this._left) / this._width, 0, 100);
this.value(percentage * (this._max - this._min));
};
/**
* Mouseup or touchend event handler bound to body
* @param {Event}
*
* @api private
*/
Sldr.prototype.touchend = function(e) {
e.preventDefault();
this.el.classList.remove('is-active');
this.bodyEvents.unbind();
};
/**
* Position value label
*
* @api private
*/
Sldr.prototype.positionLabel = function() {
if(!this._width) this._width = this.el.clientWidth;
var w = this.valueEl.clientWidth;
var x = 0;
var padding = 20;
var offset = this.percentage() / 100 * this._width;
// Check if there's enough room for label to be in
if(w + padding < offset){
this.valueEl.classList.remove('is-close-zero');
x = offset - w - padding / 2;
} else {
this.valueEl.classList.add('is-close-zero');
x = offset + padding / 2;
}
translate(this.valueEl, x, 0);
};
/**
* Get or set `value`
*
* @param {Number} value to set
* @param {Boolean} noEmit
* @api public
*/
Sldr.prototype.value = function(val) {
if (arguments.length) {
this._value = constrain(val, this._min, this._max);
this.update();
if(!this.skipEmit) this.emit('change', this._value);
} else {
return this._value;
}
};
/**
* Get or set `min` for range.
*
* @param {Number} min value to set
* @api public
*/
Sldr.prototype.min = function(val) {
if (arguments.length) {
this._min = val;
this.update();
} else {
return this._min;
}
};
/**
* Get or set `max` for range.
*
* @param {Number} max value to set
* @api public
*/
Sldr.prototype.max = function(val) {
if (arguments.length) {
this._max = val;
this.update();
} else {
return this._max;
}
};
/**
* Update DOM Elements
*
* @api private
*/
Sldr.prototype.update = function() {
// Update value;
this.valueEl.innerText = this.format(this._value);
this.positionLabel();
// Update gauge
var x = -(100 - this.percentage()) + '%';
translate(this.gaugeEl, x, 0);
// Update min / max
this.minEl.innerText = this.format(this._min);
this.maxEl.innerText = this.format(this._max);
};
/**
* Returns the percentage of current value in the range of `min`, `max`
*
* @api public
*/
Sldr.prototype.percentage = function(v) {
v = v || this._value;
return (this._value - this._min) / (this._max - this._min) * 100;
};
/**
* Format values for labels
*
* @param {Number} value to format
* @return {String}
*
* @api public
*/
Sldr.prototype.format = function(v){
var val = '' + Math.round( v * 100 ) / 100;
if(!/\./.test(val)) val += '.00';
return val;
}
/**
* Destroy `Sldr` instance
*
* @api public
*/
Sldr.prototype.destroy = function() {
this.unbind();
this.el.parentElement && this.el.parentElement.removeChild(this.el);
this.el = null;
};