回答編集履歴
2
chousei
test
CHANGED
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@@ -29,8 +29,6 @@
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29
29
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fetch(url+'?select_a='+s_a.value).then(res=>res.json()).then(res=>{
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30
30
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31
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const dom=res.map(x=>Object.assign(document.createElement('option'),{value:x.code,textContent:x.name}));
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32
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-
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33
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-
var count=0;
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34
32
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35
33
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while(s_b.querySelectorAll('option').length>1){
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36
34
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1
sample
test
CHANGED
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@@ -3,3 +3,139 @@
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3
3
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であればselect_aのchangeイベントでajax(or fetch)でselect_bのリストを
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4
4
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5
5
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もってくればいいでしょう
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6
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+
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7
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+
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8
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+
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9
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+
- mypage.html
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10
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+
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11
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+
```javascript
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12
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+
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13
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<script>
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14
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+
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15
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window.addEventListener('DOMContentLoaded', ()=>{
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16
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+
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17
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const s_a=document.querySelector('#select_a');
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18
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+
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19
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const s_b=document.querySelector('#select_b');
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20
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+
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21
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const url="json.php";
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22
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+
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23
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s_b.disabled=true;
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24
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25
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s_a.addEventListener('change',e=>{
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26
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27
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s_b.disabled=s_a.selectedIndex==0;
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28
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+
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29
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fetch(url+'?select_a='+s_a.value).then(res=>res.json()).then(res=>{
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30
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31
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const dom=res.map(x=>Object.assign(document.createElement('option'),{value:x.code,textContent:x.name}));
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32
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+
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33
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var count=0;
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34
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35
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while(s_b.querySelectorAll('option').length>1){
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36
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+
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37
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s_b.removeChild(s_b.querySelector('option:nth-child(2)'));
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38
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+
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39
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}
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40
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+
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41
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dom.forEach(x=>s_b.appendChild(x));
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42
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43
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});
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44
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+
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45
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});
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46
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47
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});
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48
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+
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49
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</script>
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50
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+
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51
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<select id="select_a" name="select_a">
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52
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53
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<option value="">= 選択 =</option>
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54
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55
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<option value="0">東日本</option>
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56
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57
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<option value="1">西日本</option>
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58
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59
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<option value="2">海外</option>
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60
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+
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61
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<option value="3">ダミー</option> <!-- select_bは空になる -->
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62
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63
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</select>
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64
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65
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<select id="select_b"name="select_b">
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66
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67
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<option value="">= 選択 =</option>
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68
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69
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</select>
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70
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+
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71
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```
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72
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+
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73
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- json.php
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74
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75
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```PHP
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76
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77
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<?PHP
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78
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79
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$select_a=filter_input(INPUT_GET,"select_a",FILTER_VALIDATE_INT);
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80
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+
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81
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$a=[
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82
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83
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[
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84
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85
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["code"=>"001","name"=>"営業A"],
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86
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87
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["code"=>"002","name"=>"営業B"],
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88
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89
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["code"=>"003","name"=>"営業C"],
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90
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91
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["code"=>"004","name"=>"開発"],
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92
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93
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],
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94
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95
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[
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96
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97
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["code"=>"001","name"=>"営業A"],
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98
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99
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["code"=>"002","name"=>"営業B"],
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100
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101
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["code"=>"003","name"=>"開発"]
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102
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103
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],
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104
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105
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[
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106
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107
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["code"=>"001","name"=>"営業A"],
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108
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109
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["code"=>"002","name"=>"営業B"],
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110
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111
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["code"=>"003","name"=>"開発A"],
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112
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113
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["code"=>"004","name"=>"開発B"],
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114
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+
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115
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],
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116
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+
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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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$list_a=array_keys($a);
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120
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+
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121
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if(in_array($select_a,$list_a,true)===false){
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122
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+
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123
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$select_a=null;
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124
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+
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125
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}
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126
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+
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127
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+
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128
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+
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129
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+
if(!is_null($select_a)){
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130
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+
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131
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print json_encode($a[$select_a]);
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132
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+
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133
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}else{
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134
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+
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135
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print "[]";
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136
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+
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137
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+
}
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138
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+
|
|
139
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+
?>
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|
140
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+
|
|
141
|
+
```
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