回答編集履歴
3
ついか
answer
CHANGED
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@@ -101,4 +101,68 @@
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101
101
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<option value="もも">もも</option>
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102
102
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<option value="バナナ">バナナ</option>
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103
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</select>
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104
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+
```
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105
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+
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106
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# 補足
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107
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デフォルト値がある場合の処理
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108
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+
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109
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```javascript
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110
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<script>
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111
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window.addEventListener('DOMContentLoaded', function(e){
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112
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var nodes=document.querySelectorAll('.s');
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113
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Array.prototype.forEach.call(nodes,function(n){
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114
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n.trigger=function(eventStr){
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115
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if (document.createEvent) {
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116
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var e = document.createEvent("HTMLEvents");
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117
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e.initEvent(eventStr, true, true );
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118
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return this.dispatchEvent(e);
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119
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} else {
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120
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var e = document.createEventObject();
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121
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return this.fireEvent("on"+eventStr, e);
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122
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}
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123
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};
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124
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n.addEventListener('change',function(){
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125
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Array.prototype.forEach.call(nodes,function(n){
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126
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Array.prototype.forEach.call(n.querySelectorAll('option:disabled'),function(n){
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127
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n.disabled=false;
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128
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});
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129
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});
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130
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Array.prototype.map.call(nodes,function(n){
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131
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return n.value;
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132
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}).filter(function(v){
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133
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return v!=="";
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134
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}).forEach(function(v){
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135
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Array.prototype.forEach.call(nodes,function(n){
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136
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if(n.value!==v) n.querySelector('option[value='+v+']').disabled=true;
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137
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});
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138
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});
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139
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});
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140
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});
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141
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nodes[0].trigger('change');
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142
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});
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143
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</script>
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144
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<select name="s1" class="s">
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145
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<option value="">------</option>
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146
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<option value="りんご">りんご</option>
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147
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<option value="みかん">みかん</option>
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148
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<option value="いちご" selected>いちご</option>
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149
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<option value="バナナ">バナナ</option>
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150
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<option value="もも">もも</option>
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151
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</select>
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152
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+
<select name="s2" class="s">
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153
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<option value="">------</option>
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154
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<option value="もも">もも</option>
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155
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<option value="みかん">みかん</option>
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156
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<option value="バナナ">バナナ</option>
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157
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<option value="いちご">いちご</option>
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158
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<option value="りんご" selected>りんご</option>
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159
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</select>
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160
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+
<select name="s3" class="s">
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161
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<option value="">------</option>
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162
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<option value="いちご">いちご</option>
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163
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<option value="みかん" selected>みかん</option>
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164
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<option value="りんご">りんご</option>
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165
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<option value="もも">もも</option>
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166
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<option value="バナナ">バナナ</option>
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167
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</select>
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104
168
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```
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2
追記
answer
CHANGED
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@@ -49,4 +49,56 @@
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49
49
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<option value="もも">もも</option>
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50
50
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</select>
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51
51
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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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+
# valueの比較バージョン
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55
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+
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56
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```javascript
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57
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window.addEventListener('DOMContentLoaded', function(e){
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58
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var nodes=document.querySelectorAll('.s');
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59
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Array.prototype.forEach.call(nodes,function(n){
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60
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n.addEventListener('change',function(){
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61
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Array.prototype.forEach.call(nodes,function(n){
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62
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Array.prototype.forEach.call(n.querySelectorAll('option:disabled'),function(n){
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63
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n.disabled=false;
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64
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});
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65
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});
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66
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Array.prototype.map.call(nodes,function(n){
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67
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return n.value;
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68
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}).filter(function(v){
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69
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return v!=="";
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70
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}).forEach(function(v){
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71
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Array.prototype.forEach.call(nodes,function(n){
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72
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if(n.value!==v) n.querySelector('option[value='+v+']').disabled=true;
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73
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});
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74
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});
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75
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});
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76
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});
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77
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});
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78
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```
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79
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```HTML
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80
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+
<select name="s1" class="s">
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81
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+
<option value="">------</option>
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82
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+
<option value="りんご">りんご</option>
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83
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+
<option value="みかん">みかん</option>
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84
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+
<option value="いちご">いちご</option>
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85
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+
<option value="バナナ">バナナ</option>
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86
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+
<option value="もも">もも</option>
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87
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+
</select>
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88
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+
<select name="s2" class="s">
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89
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<option value="">------</option>
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90
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+
<option value="もも">もも</option>
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91
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+
<option value="みかん">みかん</option>
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92
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+
<option value="バナナ">バナナ</option>
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93
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+
<option value="いちご">いちご</option>
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94
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+
<option value="りんご">りんご</option>
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95
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+
</select>
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96
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+
<select name="s3" class="s">
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97
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+
<option value="">------</option>
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98
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+
<option value="いちご">いちご</option>
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99
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+
<option value="みかん">みかん</option>
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100
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+
<option value="りんご">りんご</option>
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|
101
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+
<option value="もも">もも</option>
|
|
102
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+
<option value="バナナ">バナナ</option>
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103
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+
</select>
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52
104
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```
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1
調整
answer
CHANGED
|
@@ -29,17 +29,24 @@
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29
29
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<option value="りんご">りんご</option>
|
|
30
30
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<option value="みかん">みかん</option>
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31
31
|
<option value="いちご">いちご</option>
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32
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+
<option value="バナナ">バナナ</option>
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33
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+
<option value="もも">もも</option>
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32
34
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</select>
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33
35
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<select name="s2" class="s">
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34
36
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<option value="">------</option>
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35
37
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<option value="りんご">りんご</option>
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36
38
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<option value="みかん">みかん</option>
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37
39
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<option value="いちご">いちご</option>
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40
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+
<option value="バナナ">バナナ</option>
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41
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+
<option value="もも">もも</option>
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38
42
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</select>
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39
43
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<select name="s3" class="s">
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40
44
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<option value="">------</option>
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41
45
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<option value="りんご">りんご</option>
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42
46
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<option value="みかん">みかん</option>
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43
47
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<option value="いちご">いちご</option>
|
|
48
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+
<option value="バナナ">バナナ</option>
|
|
49
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+
<option value="もも">もも</option>
|
|
44
50
|
</select>
|
|
51
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+
|
|
45
52
|
```
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