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Interactivity 59 24 } 25 }, 26 }); The calculator is ready to be put to use. We just had to move whatever was inside calculate method to the computed property c and we are done! Whenever you change the value of a or b the result updates in real time! We don’t need no buttons, no events, nor anything. How awesome is that?? Info Note here that a normal approach would be to have an if statement to avoid error for the division. The best part about this is that there is already a prediction for this kind of flaws. If the user types 1/0 the result automatically becomes infinity! If the user types a text the displayed result is “not a number”. Calculator built with computed properties. 5.4.1 Using Computed Properties to Filter an Array A computed property can also be used to filter an array. Using a computed property to perform array filtering gives you in-depth control and more flexibility, since it’s full JavaScript, and allows you to
Interactivity 60 access the filtered result elsewhere. For example you can get the length of a filtered array elsewhere in your code. To see how it’s done, we will filter the famous stories as we did in the Custom Filter example. This time we will create a computed property that returns the filtered Array. 1 new Vue({ 2 el: '.container', 3 data: { 4 stories: [ 5 { 6 plot: "I crashed my car today!", 7 writer: "Alex", 8 upvotes: 28 9 }, 10 { 11 plot: "Yesterday, someone stole my bag!", 12 writer: "John", 13 upvotes: 8 14 }, 15 { 16 plot: "Someone ate my chocolate...", 17 writer: "John", 18 upvotes: 51 19 }, 20 { 21 plot: "I ate someone's chocolate!", 22 writer: "Alex", 23 upvotes: 74 24 }, 25 ] 26 }, 27 computed: { 28 famous: function() { 29 return this.stories.filter(function(item){ 30 return item.upvotes > 25; 31 }); 32 } 33 } 34 }) In our HTML code, instead of stories array, we will render the famous computed property.
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The Majesty Of Vue.js © 2015 - 201
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CONTENTS 3. A Flavor of Directives.
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Introduction i
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About Vue.js iii “Mark my words:
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About Vue.js v React React and Vue.
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About Vue.js vii Ember Ember is a f
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About Vue.js ix Riot Riot 2.0 provi
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Welcome xi Homework The best way to
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Vue.js Fundamentals 1
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Install Vue.js 3 1 # latest stable
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Getting Started 5 10 11 12 13 14
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Getting Started 7 Two-way data bind
Page 26 and 27: Getting Started 9 2.4 Homework A ni
Page 28 and 29: A Flavor of Directives. 11 15 messa
Page 30 and 31: A Flavor of Directives. 13 Info An
Page 32 and 33: A Flavor of Directives. 15 Template
Page 34 and 35: A Flavor of Directives. 17 12 13
Page 36 and 37: A Flavor of Directives. 19 3.5 Home
Page 38 and 39: List Rendering 21 At this point, we
Page 40 and 41: List Rendering 23 4.2 v-for In orde
Page 42 and 43: List Rendering 25 4.3 Array Renderi
Page 44 and 45: List Rendering 27 This is the outpu
Page 46 and 47: List Rendering 29 Rendered array wi
Page 48 and 49: List Rendering 31 1 2 Let's hear s
Page 50 and 51: List Rendering 33 37 data: { 38 sto
Page 52 and 53: List Rendering 35 13 14 17 {{ sto
Page 54 and 55: List Rendering 37 Isn’t that awes
Page 56 and 57: List Rendering 39 36 writer: "John"
Page 58 and 59: List Rendering 41 We initialize ord
Page 60 and 61: List Rendering 43 29 }) 30 31 new V
Page 62 and 63: List Rendering 45 4.8 Homework For
Page 64 and 65: Interactivity 47 1 2 3 5 Upvote
Page 66 and 67: Interactivity 49 1 2 3 5 Upvote
Page 68 and 69: Interactivity 51 19 20 22 23 25
Page 70 and 71: Interactivity 53 Using Event Modifi
Page 72 and 73: Interactivity 55 11 {{$data | json}
Page 74 and 75: Interactivity 57 But there is a mor
Page 78 and 79: Interactivity 61 1 2 3 Let's hear
Page 80 and 81: 6. Components 6.1 What are Componen
Page 82 and 83: Components 65 1 2 3 4 5 6 7
Page 84 and 85: Components 67 1 Vue.component('stor
Page 86 and 87: Components 69 Info v-bind is used t
Page 88 and 89: Components 71 1 2 Lets hear some s
Page 90 and 91: Components 73 1 2 3 5 Hello Vue
Page 92 and 93: Components 75 13 el: '#app', 14 dat
Page 94 and 95: Components 77 16 17 1 Vue.compone
Page 96 and 97: Components 79 1 2 3 Let's hear so
Page 98 and 99: Components 81 6.7 Homework This is
Page 100 and 101: 7. Class and Style Bindings 7.1 Cla
Page 102 and 103: Class and Style Bindings 85 Changed
Page 104 and 105: Class and Style Bindings 87 7.1.2 A
Page 106 and 107: Class and Style Bindings 89 Style o
Page 108 and 109: Class and Style Bindings 91 32 }, 3
Page 110 and 111: Consuming an API 93
Page 112 and 113: Preface 95 8.2.1 Download Book’s
Page 114 and 115: Preface 97 As indicated in the abov
Page 116 and 117: Working with real data 99 To do so
Page 118 and 119: Working with real data 101 Get stor
Page 120 and 121: Working with real data 103 Renderin
Page 122 and 123: Working with real data 105 1 2 3
Page 124 and 125: Working with real data 107 1 2 3
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10. Integrating vue-resource 10.1 O
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Integrating vue-resource 111 DELETE
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Integrating vue-resource 113 1 read
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Integrating vue-resource 115 1 var
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Integrating vue-resource 117 We obs
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Integrating vue-resource 119 The fe
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Integrating vue-resource 121 1 Vue.
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Integrating vue-resource 123 31 33
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Integrating vue-resource 125 1 Vue.
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Integrating vue-resource 127 10.6 H
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