Github Bugsbugme Vanilla Javascript Calculator Pure vanilla javascript calculator using modern es6 syntax and classes webdevsimplified vanilla javascript calculator. [1] 63 | let integerdisplay 64 | if (isnan (integerdigits)) { 65 | integerdisplay = '' 66 | } else { 67 | integerdisplay = integerdigits.tolocalestring ('en', { maximumfractiondigits: 0 }) 68 | } 69 | if (decimaldigits != null) { 70 | return `$ {integerdisplay}.$ {decimaldigits}` 71 | } else { 72 | return integerdisplay 73 | } 74 | } 75 | 76 | updatedisplay () { 77 | this.currentoperandtextelement.innertext = 78 | this.getdisplaynumber (this.currentoperand) 79 | if (this.operation != null) { 80 | this.previousoperandtextelement.innertext = 81 | `$ {this.getdisplaynumber (this.previousoperand)} $ {this.operation}` 82 | } else { 83 | this.previousoperandtextelement.innertext = '' 84 | } 85 | } 86 | } 87 | 88 | 89 | const numberbuttons = document.queryselectorall (' [data number]') 90 | const operationbuttons = document.queryselectorall (' [data operation]') 91 | const equalsbutton = document.queryselector (' [data equals]') 92 | const deletebutton = document.queryselector (' [data delete]') 93 | const allclearbutton = document.queryselector (' [data all clear]') 94 | const previousoperandtextelement = document.queryselector (' [data previous operand]') 95 | const currentoperandtextelement = document.queryselector (' [data current operand]') 96 | 97 | const calculator = new calculator (previousoperandtextelement, currentoperandtextelement) 98 | 99 | numberbuttons.foreach (button => { 100 | button.addeventlistener ('click', () => { 101 | calculator.appendnumber (button.innertext) 102 | calculator.updatedisplay () 103 | }) 104 | }) 105 | 106 | operationbuttons.foreach (button => { 107 | button.addeventlistener ('click', () => { 108 | calculator.chooseoperation (button.innertext) 109 | calculator.updatedisplay () 110 | }) 111 | }) 112 | 113 | equalsbutton.addeventlistener ('click', button => { 114 | calculator pute () 115 | calculator.updatedisplay () 116 | }) 117 | 118 | allclearbutton.addeventlistener ('click', button => { 119 | calculator.clear () 120 | calculator.updatedisplay () 121 | }) 122 | 123 | deletebutton.addeventlistener ('click', button => { 124 | calculator.delete () 125 | calculator.updatedisplay () 126 | }) styles.css: 1 | *, *::before, *::after { 2 | box sizing: border box; 3 | font family: gotham rounded, sans serif; 4 | font weight: normal; 5 | } 6 | 7 | body { 8 | padding: 0; 9 | margin: 0; 10 | background: linear gradient (to right, #00aaff, #00ff6c); 11 | } 12 | 13 | .calculator grid { 14 | display: grid; 15 | justify content: center; 16 | align content: center; 17 | min height: 100vh; 18 | grid template columns: repeat (4, 100px); 19 | grid template rows: minmax (120px, auto) repeat (5, 100px); 20 | } 21 | 22 | .calculator grid > button { 23 | cursor: pointer; 24 | font size: 2rem; 25 | border: 1px solid white; 26 | outline: none; 27 | background color: rgba (255, 255, 255, .75); 28 | } 29 | 30 | .calculator grid > button:hover { 31 | background color: rgba (255, 255, 255, .9); 32 | } 33 | 34 | .span two { 35 | grid column: span 2; 36 | } 37 | 38 | .output { 39 | grid column: 1 1; 40 | background color: rgba (0, 0, 0, .75); 41 | display: flex; 42 | align items: flex end; 43 | justify content: space around; 44 | flex direction: column; 45 | padding: 10px; 46 | word wrap: break word; 47 | word break: break all; 48 | } 49 | 50 | .output .previous operand { 51 | color: rgba (255, 255, 255, .75); 52 | font size: 1.5rem; 53 | } 54 | 55 | .output .current operand { 56 | color: white; 57 | font size: 2.5rem; 58 | }.
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