78 lines
3 KiB
JavaScript
78 lines
3 KiB
JavaScript
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var App = new Vue({
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el: '#calculator', // Context for 'data' usage
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data: {
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result: 0,
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previousResult: NaN,
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calculation: '' // String that'll hold our calculation, such as '6+4/2*2'
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},
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methods: {
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// Resets all of our values
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clear: function() {
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this.result = 0;
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this.previousResult = NaN;
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this.calculation = '';
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},
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// Takes a character and appends it to our calculation
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calcAdd: function(char) {
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this.calculation += char;
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this.result = this.calculation;
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},
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// Always removes character at the end of our string
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calcRemove: function() {
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if (typeof this.calculation === 'string' && this.calculation.length) {
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this.calculation = this.calculation.slice(0, -1);
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this.result = this.calculation;
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}
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},
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// Perform the calculation and display the results
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equals: function() {
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// Strip out any non-numeric character or simple math expressions
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var calcSafe = this.calculation.replace(/[^0-9\+\-\*\/]/g, '');
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// If our calculation starts with an operator, we prepend the previous result to the calculation
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if (isNaN(calcSafe.charAt(0))) calcSafe = this.previousResult + calcSafe;
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// Do the math, round to nearest whole number (as per project requirements)
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try {
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this.result = Math.round(eval(calcSafe)); // Eval is safe here because of the above regex
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this.previousResult = this.result; // Set previousResult for next time
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this.calculation = ''; // Clean slate our calculation for a new one
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} catch (e) {
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console.warn('Invalid Calculation'); // Something went wrong, but most likely the user has an operation at the end of the calculation so don't do anything.
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}
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}
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}
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});
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$(document).ready(function() {
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// This command is used to initialize some elements and make them work properly
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$.material.init();
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// Key Bindings
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$(document).on('keypress', function(event) {
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switch (event.keyCode) {
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case 61: // =
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case 13: // Enter
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App.equals();
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break;
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case 47: // / (Forward Slash... haha)
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App.calcAdd('/');
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break;
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case 42: // *
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case 120: // x
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App.calcAdd('*');
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break;
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case 45: // -
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App.calcAdd('-');
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break;
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case 43: // +
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App.calcAdd('+');
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break;
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default:
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// Keyboard numbers range from 48 to 57...
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if (event.keyCode >= 48 && event.keyCode <= 57) {
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// ...so leverage this by subtracting 48 from the keyCode and just pass it on to the calculation.
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App.calcAdd(event.keyCode - 48);
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}
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}
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});
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});
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