回答編集履歴
4
+
test
CHANGED
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@@ -174,7 +174,7 @@
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174
174
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175
175
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function handleClick (event) {
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176
176
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177
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-
const index = event.target.getAttribute('data-index');
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177
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+
const index = +event.target.getAttribute('data-index');
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178
178
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179
179
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180
180
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3
Bubbling Phase
test
CHANGED
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@@ -76,4 +76,124 @@
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76
76
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77
77
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78
78
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79
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+
### data-*属性
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80
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+
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81
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82
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83
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```HTML
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84
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+
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85
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+
<button class="btn" data-index="1">1</button>
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86
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+
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87
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<button class="btn" data-index="2">2</button>
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88
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89
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+
<button class="btn" data-index="3">3</button>
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90
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+
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91
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+
<button class="btn" data-index="4">4</button>
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92
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93
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<button class="btn" data-index="5">5</button>
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94
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95
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+
<button class="btn" data-index="6">6</button>
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96
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+
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97
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+
<button class="btn" data-index="7">7</button>
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98
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99
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+
<button class="btn" data-index="8">8</button>
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100
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+
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101
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+
<button class="btn" data-index="9">9</button>
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102
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+
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103
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<script>
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104
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+
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105
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'use strict';
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106
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107
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function handleClick (event) {
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108
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109
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+
const index = event.currentTarget.getAttribute('data-index');
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110
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+
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111
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+
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112
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+
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113
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+
if (/[1-5]/.test(index)) {
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114
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+
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115
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+
console.log('btn' + index);
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116
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117
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}
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118
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+
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119
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+
}
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120
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+
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121
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+
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122
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+
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123
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+
for (let btn of document.querySelectorAll('.btn')) {
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124
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125
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btn.addEventListener('click', handleClick, false);
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126
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+
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127
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}
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128
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+
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129
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</script>
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130
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131
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```
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132
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133
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134
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135
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+
### Bubbling Phase
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136
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137
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138
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139
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+
目的次第ですが、私は基本的にこの方法を使います。
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140
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141
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142
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143
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+
- [3.1. イベント配送と DOM イベントフロー - UI Events （日本語訳）](https://triple-underscore.github.io/uievents-ja.html#event-flow)
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144
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+
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145
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146
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147
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```HTML
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148
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+
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149
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+
<p id="btn-group">
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150
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+
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151
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+
<button class="btn" data-index="1">1</button>
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152
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+
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153
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<button class="btn" data-index="2">2</button>
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154
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155
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<button class="btn" data-index="3">3</button>
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156
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+
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157
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<button class="btn" data-index="4">4</button>
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158
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159
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<button class="btn" data-index="5">5</button>
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160
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161
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<button class="btn" data-index="6">6</button>
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162
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+
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163
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<button class="btn" data-index="7">7</button>
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164
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+
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165
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<button class="btn" data-index="8">8</button>
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166
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+
|
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167
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+
<button class="btn" data-index="9">9</button>
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168
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+
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169
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+
</p>
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170
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+
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171
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<script>
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172
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+
|
|
173
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+
'use strict';
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174
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+
|
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175
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+
function handleClick (event) {
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176
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+
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177
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const index = event.target.getAttribute('data-index');
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178
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+
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179
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+
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180
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+
|
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181
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+
if (index < 6) {
|
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182
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+
|
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183
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+
console.log('btn' + index);
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184
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+
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185
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+
}
|
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186
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+
|
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187
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+
}
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188
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+
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189
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+
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190
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+
|
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191
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+
document.getElementById('btn-group').addEventListener('click', handleClick, false);
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192
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+
|
|
193
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+
</script>
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|
194
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+
|
|
195
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+
```
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196
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+
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197
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+
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198
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+
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79
199
|
Re: Tubuanpan さん
|
2
typo修正
test
CHANGED
|
@@ -36,7 +36,7 @@
|
|
|
36
36
|
|
|
37
37
|
case 'btn5':
|
|
38
38
|
|
|
39
|
-
consle.log(token);
|
|
39
|
+
console.log(token);
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|
40
40
|
|
|
41
41
|
break;
|
|
42
42
|
|
|
@@ -62,7 +62,7 @@
|
|
|
62
62
|
|
|
63
63
|
if (/^btn\d+$/.test(token)) {
|
|
64
64
|
|
|
65
|
-
consle.log(token);
|
|
65
|
+
console.log(token);
|
|
66
66
|
|
|
67
67
|
break;
|
|
68
68
|
|
1
addEventListener
test
CHANGED
|
@@ -1,3 +1,19 @@
|
|
|
1
|
+
### addEventListener
|
|
2
|
+
|
|
3
|
+
|
|
4
|
+
|
|
5
|
+
> ```JavaScript
|
|
6
|
+
|
|
7
|
+
> btn[i].addEventListener('click', btnClick);
|
|
8
|
+
|
|
9
|
+
> ```
|
|
10
|
+
|
|
11
|
+
|
|
12
|
+
|
|
13
|
+
現在の `addEventListener` は第三引数を省略可能ですが、後方互換性の為に、第三引数は省略しない事をお勧めします。
|
|
14
|
+
|
|
15
|
+
|
|
16
|
+
|
|
1
17
|
### switch 文
|
|
2
18
|
|
|
3
19
|
|