回答編集履歴
2
chousei
answer
CHANGED
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@@ -14,7 +14,6 @@
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14
14
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s_b.disabled=s_a.selectedIndex==0;
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15
15
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fetch(url+'?select_a='+s_a.value).then(res=>res.json()).then(res=>{
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16
16
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const dom=res.map(x=>Object.assign(document.createElement('option'),{value:x.code,textContent:x.name}));
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17
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-
var count=0;
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18
17
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while(s_b.querySelectorAll('option').length>1){
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19
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s_b.removeChild(s_b.querySelector('option:nth-child(2)'));
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20
19
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}
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1
sample
answer
CHANGED
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@@ -1,3 +1,71 @@
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1
1
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サーバー側でSQLでも走らせているのでしょか？
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2
2
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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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3
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-
もってくればいいでしょう
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3
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+
もってくればいいでしょう
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4
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+
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5
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+
- mypage.html
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6
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+
```javascript
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7
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<script>
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8
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window.addEventListener('DOMContentLoaded', ()=>{
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9
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const s_a=document.querySelector('#select_a');
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10
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const s_b=document.querySelector('#select_b');
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11
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const url="json.php";
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12
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s_b.disabled=true;
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13
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s_a.addEventListener('change',e=>{
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14
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s_b.disabled=s_a.selectedIndex==0;
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15
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fetch(url+'?select_a='+s_a.value).then(res=>res.json()).then(res=>{
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16
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const dom=res.map(x=>Object.assign(document.createElement('option'),{value:x.code,textContent:x.name}));
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17
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var count=0;
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18
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while(s_b.querySelectorAll('option').length>1){
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19
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s_b.removeChild(s_b.querySelector('option:nth-child(2)'));
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20
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}
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21
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dom.forEach(x=>s_b.appendChild(x));
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22
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});
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23
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});
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24
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});
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25
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</script>
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26
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<select id="select_a" name="select_a">
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27
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<option value="">= 選択 =</option>
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28
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<option value="0">東日本</option>
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29
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<option value="1">西日本</option>
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30
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<option value="2">海外</option>
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31
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<option value="3">ダミー</option> <!-- select_bは空になる -->
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32
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</select>
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33
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<select id="select_b"name="select_b">
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34
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<option value="">= 選択 =</option>
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35
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</select>
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36
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```
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37
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- json.php
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38
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```PHP
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39
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<?PHP
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40
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$select_a=filter_input(INPUT_GET,"select_a",FILTER_VALIDATE_INT);
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41
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$a=[
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42
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[
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43
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["code"=>"001","name"=>"営業A"],
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44
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["code"=>"002","name"=>"営業B"],
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45
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["code"=>"003","name"=>"営業C"],
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46
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["code"=>"004","name"=>"開発"],
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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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["code"=>"001","name"=>"営業A"],
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50
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["code"=>"002","name"=>"営業B"],
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51
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["code"=>"003","name"=>"開発"]
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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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["code"=>"001","name"=>"営業A"],
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55
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["code"=>"002","name"=>"営業B"],
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56
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["code"=>"003","name"=>"開発A"],
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57
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["code"=>"004","name"=>"開発B"],
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58
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],
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59
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];
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60
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$list_a=array_keys($a);
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61
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if(in_array($select_a,$list_a,true)===false){
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62
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$select_a=null;
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63
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}
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64
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+
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65
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if(!is_null($select_a)){
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66
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print json_encode($a[$select_a]);
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67
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}else{
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68
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print "[]";
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69
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}
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70
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?>
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71
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```
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