回答編集履歴
2
追記が蛇足だったので取り消し
answer
CHANGED
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@@ -49,66 +49,4 @@
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49
49
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proxiedTarget.active = !proxiedTarget.active
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50
50
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51
51
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proxiedTarget.handleEvent({ type: 'focus' })
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52
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-
```
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53
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-
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54
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-
---
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55
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-
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56
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-
追記（汎用化？）
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57
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-
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58
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-
```javascript
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59
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const Target = class {
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60
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-
#element
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61
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#active
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62
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constructor(element) {
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63
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this.#element = element
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64
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element.addEventListener('focus', this)
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65
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element.addEventListener('blur', this)
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66
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}
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67
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get element() {
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68
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return this.#element
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69
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}
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70
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get active() {
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71
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return !!this.#active
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72
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}
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73
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set active(bool) {
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74
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this.#active = bool
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75
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}
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76
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handleEvent({ type }) {
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77
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console.log(type + ' before', this.active)
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78
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this.active = type === 'focus'
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79
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console.log(type + ' after', this.active)
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80
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}
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81
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-
}
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82
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-
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83
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const handler = {
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84
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get(target, key, receiver) {
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85
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return target[ key ]
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86
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},
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87
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-
set(target, key, value, receiver) {
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88
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console.log('YES!', { target, key, value, receiver }) //何らかの処理
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89
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target[ key ] = value
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90
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return true
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91
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-
}
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92
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-
}
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93
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-
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94
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const proxied = target => class extends target {
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95
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constructor(...arg) {
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96
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super(...arg)
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97
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const proxiedTarget = new Proxy(this, handler)
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98
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typeof this.handleEvent === 'function' && (this.handleEvent = this.handleEvent.bind(proxiedTarget))
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99
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return proxiedTarget
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100
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-
}
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101
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-
}
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102
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-
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103
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const ProxiedTarget = proxied(Target)
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104
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-
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105
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const element = document.body.appendChild(document.createElement('textarea'))
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106
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-
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107
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const proxiedTarget = new ProxiedTarget(element)
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108
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-
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109
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proxiedTarget.active = !proxiedTarget.active
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110
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-
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111
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-
proxiedTarget.active = !proxiedTarget.active
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112
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-
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113
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-
proxiedTarget.handleEvent({ type: 'focus' })
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114
52
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```
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1
コードの追加
answer
CHANGED
|
@@ -49,4 +49,66 @@
|
|
|
49
49
|
proxiedTarget.active = !proxiedTarget.active
|
|
50
50
|
|
|
51
51
|
proxiedTarget.handleEvent({ type: 'focus' })
|
|
52
|
+
```
|
|
53
|
+
|
|
54
|
+
---
|
|
55
|
+
|
|
56
|
+
追記（汎用化？）
|
|
57
|
+
|
|
58
|
+
```javascript
|
|
59
|
+
const Target = class {
|
|
60
|
+
#element
|
|
61
|
+
#active
|
|
62
|
+
constructor(element) {
|
|
63
|
+
this.#element = element
|
|
64
|
+
element.addEventListener('focus', this)
|
|
65
|
+
element.addEventListener('blur', this)
|
|
66
|
+
}
|
|
67
|
+
get element() {
|
|
68
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+
return this.#element
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|
69
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+
}
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|
70
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+
get active() {
|
|
71
|
+
return !!this.#active
|
|
72
|
+
}
|
|
73
|
+
set active(bool) {
|
|
74
|
+
this.#active = bool
|
|
75
|
+
}
|
|
76
|
+
handleEvent({ type }) {
|
|
77
|
+
console.log(type + ' before', this.active)
|
|
78
|
+
this.active = type === 'focus'
|
|
79
|
+
console.log(type + ' after', this.active)
|
|
80
|
+
}
|
|
81
|
+
}
|
|
82
|
+
|
|
83
|
+
const handler = {
|
|
84
|
+
get(target, key, receiver) {
|
|
85
|
+
return target[ key ]
|
|
86
|
+
},
|
|
87
|
+
set(target, key, value, receiver) {
|
|
88
|
+
console.log('YES!', { target, key, value, receiver }) //何らかの処理
|
|
89
|
+
target[ key ] = value
|
|
90
|
+
return true
|
|
91
|
+
}
|
|
92
|
+
}
|
|
93
|
+
|
|
94
|
+
const proxied = target => class extends target {
|
|
95
|
+
constructor(...arg) {
|
|
96
|
+
super(...arg)
|
|
97
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+
const proxiedTarget = new Proxy(this, handler)
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|
98
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+
typeof this.handleEvent === 'function' && (this.handleEvent = this.handleEvent.bind(proxiedTarget))
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|
99
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return proxiedTarget
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|
100
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+
}
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|
101
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+
}
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|
102
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+
|
|
103
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+
const ProxiedTarget = proxied(Target)
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|
104
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+
|
|
105
|
+
const element = document.body.appendChild(document.createElement('textarea'))
|
|
106
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+
|
|
107
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+
const proxiedTarget = new ProxiedTarget(element)
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|
108
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+
|
|
109
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+
proxiedTarget.active = !proxiedTarget.active
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|
110
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+
|
|
111
|
+
proxiedTarget.active = !proxiedTarget.active
|
|
112
|
+
|
|
113
|
+
proxiedTarget.handleEvent({ type: 'focus' })
|
|
52
114
|
```
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