326 lines
8.7 KiB
JavaScript
326 lines
8.7 KiB
JavaScript
/**
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* selectFx.js v1.0.0
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* http://www.codrops.com
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*
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* Licensed under the MIT license.
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* http://www.opensource.org/licenses/mit-license.php
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*
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* Copyright 2014, Codrops
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* http://www.codrops.com
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*/
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;( function( window ) {
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'use strict';
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/**
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* based on from https://github.com/inuyaksa/jquery.nicescroll/blob/master/jquery.nicescroll.js
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*/
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function hasParent( e, p ) {
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if (!e) return false;
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var el = e.target||e.srcElement||e||false;
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while (el && el != p) {
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el = el.parentNode||false;
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}
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return (el!==false);
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};
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/**
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* extend obj function
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*/
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function extend( a, b ) {
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for( var key in b ) {
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if( b.hasOwnProperty( key ) ) {
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a[key] = b[key];
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}
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}
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return a;
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}
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/**
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* SelectFx function
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*/
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function SelectFx( el, options ) {
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this.el = el;
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this.options = extend( {}, this.options );
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extend( this.options, options );
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this._init();
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}
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/**
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* SelectFx options
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*/
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SelectFx.prototype.options = {
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// if true all the links will open in a new tab.
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// if we want to be redirected when we click an option, we need to define a data-link attr on the option of the native select element
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newTab : true,
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// when opening the select element, the default placeholder (if any) is shown
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stickyPlaceholder : true,
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// callback when changing the value
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onChange : function( val ) { return false; }
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}
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/**
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* init function
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* initialize and cache some vars
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*/
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SelectFx.prototype._init = function() {
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// check if we are using a placeholder for the native select box
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// we assume the placeholder is disabled and selected by default
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var selectedOpt = this.el.querySelector( 'option[selected]' );
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this.hasDefaultPlaceholder = selectedOpt && selectedOpt.disabled;
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// get selected option (either the first option with attr selected or just the first option)
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this.selectedOpt = selectedOpt || this.el.querySelector( 'option' );
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// create structure
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this._createSelectEl();
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// all options
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this.selOpts = [].slice.call( this.selEl.querySelectorAll( 'li[data-option]' ) );
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// total options
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this.selOptsCount = this.selOpts.length;
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// current index
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this.current = this.selOpts.indexOf( this.selEl.querySelector( 'li.cs-selected' ) ) || -1;
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// placeholder elem
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this.selPlaceholder = this.selEl.querySelector( 'span.cs-placeholder' );
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// init events
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this._initEvents();
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}
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/**
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* creates the structure for the select element
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*/
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SelectFx.prototype._createSelectEl = function() {
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var self = this, options = '', createOptionHTML = function(el) {
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var optclass = '', classes = '', link = '';
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if( el.selectedOpt && !this.foundSelected && !this.hasDefaultPlaceholder ) {
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classes += 'cs-selected ';
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this.foundSelected = true;
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}
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// extra classes
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if( el.getAttribute( 'data-class' ) ) {
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classes += el.getAttribute( 'data-class' );
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}
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// link options
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if( el.getAttribute( 'data-link' ) ) {
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link = 'data-link=' + el.getAttribute( 'data-link' );
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}
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if( classes !== '' ) {
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optclass = 'class="' + classes + '" ';
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}
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return '<li ' + optclass + link + ' data-option data-value="' + el.value + '"><span>' + el.textContent + '</span></li>';
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};
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[].slice.call( this.el.children ).forEach( function(el) {
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if( el.disabled ) { return; }
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var tag = el.tagName.toLowerCase();
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if( tag === 'option' ) {
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options += createOptionHTML(el);
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}
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else if( tag === 'optgroup' ) {
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options += '<li class="cs-optgroup"><span>' + el.label + '</span><ul>';
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[].slice.call( el.children ).forEach( function(opt) {
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options += createOptionHTML(opt);
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} );
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options += '</ul></li>';
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}
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} );
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var opts_el = '<div class="cs-options"><ul>' + options + '</ul></div>';
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this.selEl = document.createElement( 'div' );
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this.selEl.className = this.el.className;
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this.selEl.tabIndex = this.el.tabIndex;
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this.selEl.innerHTML = '<span class="cs-placeholder">' + this.selectedOpt.textContent + '</span>' + opts_el;
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this.el.parentNode.appendChild( this.selEl );
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this.selEl.appendChild( this.el );
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}
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/**
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* initialize the events
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*/
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SelectFx.prototype._initEvents = function() {
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var self = this;
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// open/close select
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this.selPlaceholder.addEventListener( 'click', function() {
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self._toggleSelect();
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} );
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// clicking the options
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this.selOpts.forEach( function(opt, idx) {
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opt.addEventListener( 'click', function() {
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self.current = idx;
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self._changeOption();
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// close select elem
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self._toggleSelect();
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} );
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} );
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// close the select element if the target it´s not the select element or one of its descendants..
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document.addEventListener( 'click', function(ev) {
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var target = ev.target;
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if( self._isOpen() && target !== self.selEl && !hasParent( target, self.selEl ) ) {
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self._toggleSelect();
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}
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} );
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// keyboard navigation events
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this.selEl.addEventListener( 'keydown', function( ev ) {
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var keyCode = ev.keyCode || ev.which;
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switch (keyCode) {
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// up key
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case 38:
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ev.preventDefault();
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self._navigateOpts('prev');
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break;
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// down key
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case 40:
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ev.preventDefault();
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self._navigateOpts('next');
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break;
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// space key
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case 32:
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ev.preventDefault();
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if( self._isOpen() && typeof self.preSelCurrent != 'undefined' && self.preSelCurrent !== -1 ) {
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self._changeOption();
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}
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self._toggleSelect();
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break;
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// enter key
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case 13:
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ev.preventDefault();
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if( self._isOpen() && typeof self.preSelCurrent != 'undefined' && self.preSelCurrent !== -1 ) {
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self._changeOption();
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self._toggleSelect();
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}
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break;
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// esc key
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case 27:
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ev.preventDefault();
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if( self._isOpen() ) {
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self._toggleSelect();
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}
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break;
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}
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} );
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}
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/**
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* navigate with up/dpwn keys
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*/
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SelectFx.prototype._navigateOpts = function(dir) {
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if( !this._isOpen() ) {
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this._toggleSelect();
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}
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var tmpcurrent = typeof this.preSelCurrent != 'undefined' && this.preSelCurrent !== -1 ? this.preSelCurrent : this.current;
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if( dir === 'prev' && tmpcurrent > 0 || dir === 'next' && tmpcurrent < this.selOptsCount - 1 ) {
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// save pre selected current - if we click on option, or press enter, or press space this is going to be the index of the current option
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this.preSelCurrent = dir === 'next' ? tmpcurrent + 1 : tmpcurrent - 1;
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// remove focus class if any..
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this._removeFocus();
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// add class focus - track which option we are navigating
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classie.add( this.selOpts[this.preSelCurrent], 'cs-focus' );
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}
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}
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/**
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* open/close select
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* when opened show the default placeholder if any
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*/
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SelectFx.prototype._toggleSelect = function() {
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// remove focus class if any..
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this._removeFocus();
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if( this._isOpen() ) {
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if( this.current !== -1 ) {
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// update placeholder text
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this.selPlaceholder.textContent = this.selOpts[ this.current ].textContent;
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}
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classie.remove( this.selEl, 'cs-active' );
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}
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else {
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if( this.hasDefaultPlaceholder && this.options.stickyPlaceholder ) {
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// everytime we open we wanna see the default placeholder text
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this.selPlaceholder.textContent = this.selectedOpt.textContent;
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}
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classie.add( this.selEl, 'cs-active' );
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}
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}
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/**
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* change option - the new value is set
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*/
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SelectFx.prototype._changeOption = function() {
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// if pre selected current (if we navigate with the keyboard)...
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if( typeof this.preSelCurrent != 'undefined' && this.preSelCurrent !== -1 ) {
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this.current = this.preSelCurrent;
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this.preSelCurrent = -1;
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}
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// current option
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var opt = this.selOpts[ this.current ];
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// update current selected value
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this.selPlaceholder.textContent = opt.textContent;
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// change native select element´s value
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this.el.value = opt.getAttribute( 'data-value' );
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// remove class cs-selected from old selected option and add it to current selected option
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var oldOpt = this.selEl.querySelector( 'li.cs-selected' );
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if( oldOpt ) {
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classie.remove( oldOpt, 'cs-selected' );
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}
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classie.add( opt, 'cs-selected' );
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// if there´s a link defined
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if( opt.getAttribute( 'data-link' ) ) {
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// open in new tab?
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if( this.options.newTab ) {
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window.open( opt.getAttribute( 'data-link' ), '_blank' );
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}
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else {
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window.location = opt.getAttribute( 'data-link' );
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}
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}
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// callback
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this.options.onChange( this.el.value );
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}
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/**
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* returns true if select element is opened
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*/
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SelectFx.prototype._isOpen = function(opt) {
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return classie.has( this.selEl, 'cs-active' );
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}
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/**
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* removes the focus class from the option
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*/
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SelectFx.prototype._removeFocus = function(opt) {
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var focusEl = this.selEl.querySelector( 'li.cs-focus' )
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if( focusEl ) {
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classie.remove( focusEl, 'cs-focus' );
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}
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}
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/**
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* add to global namespace
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*/
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window.SelectFx = SelectFx;
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} )( window );
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