570 lines
19 KiB
JavaScript
570 lines
19 KiB
JavaScript
/**
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* ORGINAL VERSION:
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* calculator 2.0.0-dev by Bill Bryant 2013
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* Licensed under the MIT license.
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* https://github.com/wjbryant/calculator
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*
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* MODIFIED VERSION:
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* @author Sam <sam@taotesting.com> for OAT SA in 2016
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* - Code refactoring to fit AMD modules
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* - replaced custom selector with JQuery selectors
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* - added focus listener, decimal calculation fix, button highlight
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* - i18n
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* - added support of alternative template
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*/
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define(['jquery', 'lodash', 'tpl!lib/calculator/template', 'i18n', 'lib/gamp/gamp'], function ($, _, templateTpl, __, gamp){
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'use strict';
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var isTouchScreen = "ontouchstart" in window || navigator.maxTouchPoints;
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/**
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* the JSCALC "namespace"
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*
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* @namespace
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*/
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var JSCALC = {},
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calculators = {}, // an object containing all the calculators created
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nextID = 0;
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var _defaults = {
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template : templateTpl
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};
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/**
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* Creates a new calculator in the specified container element (module).
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*
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* @param {DOMElement} calcMod - the element to contain the calculator
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* @param {Object} [config] - optional configuration
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* @param {Function} [config.template] - an alternative handlebars template
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* @return {Calculator} a Calculator object
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*
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* @ignore
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*/
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function createCalc(calcMod, config){
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var calcTemplate,
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forms,
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form,
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display,
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total = 0,
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operation,
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clearNext = true,
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dot = /\./,
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lastNum = null,
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getLastNum = false,
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lastKeyDown,
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operationPressed = false, // whether an operation was the last key pressed
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calcObj = {},
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id = nextID;
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config = _.defaults(config || {}, _defaults);
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if(_.isFunction(config.template)){
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calcTemplate = config.template.call(null);
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}else{
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throw new TypeError('invalid template in configuration');
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}
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/**
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* Gives the focus to the input
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*/
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function setFocus() {
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if(!isTouchScreen) {
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display.focus();
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}
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}
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/**
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* Performs the basic mathematical operations (addition, subtraction,
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* multiplication, division) on the current total with the given
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* value for the current operation.
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*
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* @param {Number} val the value to use in the calculation with the total
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*
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* @ignore
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*/
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function calculate(val){
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if(!total || isNaN(total)){
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total = 0;
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}
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switch(operation){
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case '+':
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total = gamp.add(total, val);
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break;
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case '-':
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total = gamp.sub(total, val);
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break;
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case '*':
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total = gamp.mul(total, val);
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break;
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case '/':
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total = gamp.div(total, val);
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break;
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case 'pow':
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total = gamp.pow(total, val);
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break;
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}
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display.value = total;
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}
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/**
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* This function handles input for the form's keydown, keypress and
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* click events. Any keypresses that are not related to a calculator
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* function are not allowed.
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*
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* @return {Boolean} whether the default action is allowed
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*
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* @ignore
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*/
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function handleInput(e){
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e = e || window.event;
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var key, // the key (char) that was pressed / clicked
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code, // the key code
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val, // the numeric value of the display
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target, // the target element of the event
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isOperation = false; // whether the button pressed is an operation
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// this switch statement sets the key variable
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switch(e.type){
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case 'keydown':
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lastKeyDown = code = e.keyCode;
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switch(code){
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case 27:
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// escape
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key = 'C';
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break;
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case 8:
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// backspace
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key = 'DEL';
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break;
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case 46:
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// delete
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key = 'CE';
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break;
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case 111:
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case 191:
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// divide
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key = '/';
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break;
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default:
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// allow all other keys (enter, tab, numbers, letters, etc.)
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return true;
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}
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break;
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case 'keypress':
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// most browsers provide the charCode property when the keypress event is fired
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// IE and Opera provide the character code in the keyCode property instead
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code = e.charCode || e.keyCode;
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// this event is fired for all keys in Firefox and Opera
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// because of this, we need to check the last keyCode
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// from the keydown event for certain keys
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// allow enter, tab and left and right arrow keys
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// the enter key fires the keypress event in all browsers
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// the other keys are handled here for Firefox and Opera
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if(code === 13 || code === 9 || lastKeyDown === 37 || lastKeyDown === 39){
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return true;
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}
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// these keys are handled on keydown (escape, backspace, delete)
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// this is for Firefox and Opera (and sometimes IE for the escape key)
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if(code === 27 || code === 8 || lastKeyDown === 46){
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return false;
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}
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// get the key character in lower case
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if(lastKeyDown === 188){
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key = '.'; // allow the comma key to be used for a decimal point
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}else{
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key = String.fromCharCode(code).toLowerCase();
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}
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break;
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case 'click':
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target = e.target || e.srcElement;
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if((target.tagName === 'INPUT' || target.tagName === 'BUTTON') && target.type === 'button'){
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key = target.value;
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}else{
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return true;
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}
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break;
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case 'calculatorPressMethod':
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// special case for the press method of the calculator object
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key = e.calckey;
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break;
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default:
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// the switch statement should never make it here
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// this is just a safeguard
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return true;
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}
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val = parseFloat(display.value);
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switch(key){
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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case '.':
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// don't allow more than one decimal point
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if(clearNext){
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display.value = key;
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clearNext = false;
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}else if(!(key === '.' && dot.test(display.value))){
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display.value += key;
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}
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break;
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case '*':
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case '+':
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case '-':
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case '/':
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case 'pow':
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// if an operation was the last key pressed,
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// do nothing but change the current operation
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if(!operationPressed){
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if(total === 0 || lastNum !== null){
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total = val;
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}else{
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calculate(val);
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}
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lastNum = null;
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getLastNum = true;
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clearNext = true;
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}
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operation = key;
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isOperation = true;
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break;
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case 'C':
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display.blur(); // so Firefox can clear display when escape key is pressed
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total = 0;
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operation = '';
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clearNext = true;
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lastNum = null;
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getLastNum = false;
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display.value = '0';
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break;
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case 'CE':
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display.value = '0';
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clearNext = true;
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break;
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case 'DEL':
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display.value = display.value.slice(0, display.value.length - 1);
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break;
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case '+/-':
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display.value = gamp.mul(val, -1);
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break;
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case '%':
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if(val){
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display.value = gamp.div(gamp.mul(total, val), 100);
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}
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break;
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case 'sqrt':
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if(val >= 0){
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display.value = Math.sqrt(val);
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}else{
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display.value = __('Invalid input for function');
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}
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break;
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case 'a':
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case 'c':
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case 'v':
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case 'x':
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// allow select all, copy, paste and cut key combinations
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if(e.ctrlKey){
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return true;
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}
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break;
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case '1/x':
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case 'r':
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if(val){
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display.value = gamp.div(1, val);
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}else{
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display.value = __('Cannot divide by zero');
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}
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break;
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case '=':
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form.onsubmit();
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break;
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}
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operationPressed = isOperation;
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setFocus();
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if (!isOperation) {
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$(display).trigger('change');
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}
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_initButtonHighlight(form, key);
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return false;
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}
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// increment the ID counter
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nextID += 1;
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// create the calculator elements
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calcMod.innerHTML += calcTemplate;
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// get the calculator inputs
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forms = calcMod.getElementsByTagName('form');
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form = forms[forms.length - 1]; // make sure it's the one that was just added
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display = form.getElementsByTagName('input')[0];
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display.setAttribute('autocomplete', 'off');
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display.value = '0';
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display.onkeydown = display.onkeypress = form.onclick = handleInput;
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/**
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* Calculates the value of the last entered operation and displays the result.
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*
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* @return {Boolean} always returns false to prevent the form from being submitted
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*
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* @ignore
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*/
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form.onsubmit = function (){
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if(getLastNum){
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lastNum = parseFloat(display.value) || 0;
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getLastNum = false;
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}
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calculate(lastNum);
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clearNext = true;
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setFocus();
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$(display).trigger('change');
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_initButtonHighlight(form, '=');
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return false;
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};
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/**
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* Gives focus to the calculator display.
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*
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* @function
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* @name focus
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* @memberOf Calculator.prototype
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*/
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calcObj.focus = function (){
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setFocus();
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};
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/**
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* Simulates pressing a button on the calculator.
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*
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* @param {Number|String} button the button(s) to press - A number can
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* represent multiple buttons, but a
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* string can only represent one.
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* @return {Calculator} the Calculator object
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*
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* @function
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* @name press
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* @memberOf Calculator.prototype
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*/
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calcObj.press = function (button){
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var buttons,
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num,
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i;
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// if button is a number, convert it to an array of digits as strings
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if(typeof button === 'number'){
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buttons = button.toString().split('');
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}else if(typeof button === 'string' && button){
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buttons = [button];
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}else{
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// invalid argument
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return this; // do nothing, but still allow method chaining
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}
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num = buttons.length;
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for(i = 0; i < num; i += 1){
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handleInput({
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type : 'calculatorPressMethod',
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calckey : buttons[i]
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});
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}
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return this; // allow method chaining
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};
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/**
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* Removes the calculator and sets the Calculator object to null.
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*
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* @function
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* @name remove
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* @memberOf Calculator.prototype
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*/
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calcObj.remove = function (){
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display.onkeydown = display.onkeypress = form.onclick = null;
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calcMod.removeChild(form.parentNode);
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delete calculators[id];
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calcObj = null;
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};
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/**
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* a reference to the element that contains the calculator
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*
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* @name container
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* @memberOf Calculator.prototype
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*/
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calcObj.container = calcMod;
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calculators[id] = calcObj; // keep track of all calculators
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return calcObj;
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}
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/**
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* Gets the Calculator object associated with the calculator contained in
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* the specified element.
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*
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* @param {Element} container the element containing the calculator
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* @return {Calculator} the Calculator object or null if none exists
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*/
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JSCALC.get = function (container){
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// if the container argument is not an element node, do nothing
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if(!container || container.nodeType !== 1){
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return null;
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}
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var id,
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calcs = calculators,
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calc;
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for(id in calcs){
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if(calcs.hasOwnProperty(id)){
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if(container === calcs[id].container){
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calc = calcs[id];
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break;
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}
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}
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}
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return calc || null;
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};
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/**
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* Gets the Calculator objects for all the calculators on the page.
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*
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* @return {Calculator[]} an array of Calculator objects
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*/
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JSCALC.getCalcs = function (){
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var id,
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calcArray = [],
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calcs = calculators;
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// the calculators array may be sparse, so copy all objects from it
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// into a dense array and return that instead
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for(id in calcs){
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if(calcs.hasOwnProperty(id)){
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calcArray[calcArray.length] = calcs[id];
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}
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}
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return calcArray;
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};
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/**
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* Creates calculators.
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*
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* @param {String|Element} [elem] the element in which to create the calculator -
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* If the argument is a string, it should be the element id.
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* If the argument is an object, it should be the element itself.
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* @return {Calculator|Calculator[]} If an argument is specified, the Calculator object or
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* null is returned. If no arguments are specified, an
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* array of Calculator objects is returned.
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*/
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JSCALC.init = function (elem, config){
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var calcMods = [],
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args = false,
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calcMod,
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len,
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i,
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newCalcs = [];
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// treat a string argument as an element id
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if(typeof elem === 'string'){
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elem = document.getElementById(elem);
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}
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// if the argument is an element object or an element was found by id
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if(typeof elem === 'object' && elem.nodeType === 1){
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// add the "calc" class name to the element
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if(elem.className){
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if(elem.className.indexOf('calc') === -1){
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elem.className += ' calc';
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}
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}else{
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elem.className = 'calc';
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}
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// add the element to the array of calculator modules to be initialized
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calcMods[0] = elem;
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args = true;
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}else if(elem instanceof $){
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elem.each(function (){
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calcMods.push(this);
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args = true;
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});
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}else{
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// if an element node was not found or specified, get all elements
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// with a class name of "calc"
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$('.calc').each(function (){
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calcMods.push(this);
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args = true;
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});
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}
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len = calcMods.length;
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// if there is at least one element in the array
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if(len){
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// loop through the array and create a calculator in each element
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for(i = 0; i < len; i += 1){
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calcMod = calcMods[i];
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// check to ensure a calculator does not already exist in the
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// specified element
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if(!JSCALC.get(calcMod)){
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newCalcs[newCalcs.length] = createCalc(calcMod, config);
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}
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}
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}
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// if an argument was specified, return a single object or null if one
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// could not be created
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// else, return the array of objects even if it is empty
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return args ? (newCalcs[0] || null) : newCalcs;
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};
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/**
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* Removes all calculators.
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*/
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JSCALC.removeAll = function (){
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var id,
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calcs = calculators;
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// remove each calculator in the calculators array (calcs)
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for(id in calcs){
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if(calcs.hasOwnProperty(id)){
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calcs[id].remove();
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}
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}
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};
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/**
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* Adding visual feedback when an input is registered
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*
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* @param {HTMLElement} form
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* @param {string} key
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*/
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function _initButtonHighlight(form, key){
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var $btn = $(form).find('[data-key="'+key+'"]');
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$btn.addClass('triggered');
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setTimeout(function(){
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$btn.removeClass('triggered');
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}, 160);
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}
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return JSCALC;
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});
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