回答編集履歴
1
調整
test
CHANGED
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@@ -1 +1,50 @@
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1
1
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indexからconfirmにサブミットしてください
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2
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+
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3
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+
# 参考
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4
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どうしてもセッションだけで処理をしたい場合はデータ更新用にAPIを用意します
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5
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+
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6
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index.php
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7
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```php
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8
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<?PHP
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9
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session_start();
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10
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$cf02=$_SESSION["cf02"]??null;
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$h_cf02=htmlspecialchars($cf02);
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?>
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<script>
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document.addEventListener('input',({target})=>{
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if(target.matches('#yourName')){
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const body=new FormData();
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body.append('cf02',target.value);
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const method='post';
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fetch('api.php',{body,method}).then(res=>res.json()).then(console.log);
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}
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});
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</script>
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<div class="nameBox">
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<label for="yourName" class="must">お名前</label>
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<input type="text" id="yourName" name="cf02" placeholder="山田太郎" value="<?=$h_cf02?>"
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required="required">
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</div>
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<a href="confirm.php">confirm</a>
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```
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api.php
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```php
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<?PHP
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session_start();
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$options=["options"=>["regexp"=>"/.{1,10}/"]]; //参考：文字の長さが1～10文字を有効とします
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$cf02=filter_input(INPUT_POST,"cf02",FILTER_VALIDATE_REGEXP,$options);
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if(empty($cf02)){
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unset($_SESSION["cf02"]);
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$cf02=null;
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}else{
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$_SESSION["cf02"]=$cf02;
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}
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$result=["cf02"=>$cf02];
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print json_encode($result);
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```
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45
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confirm.php
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46
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```php
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<?PHP
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48
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session_start();
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49
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print $_SESSION["cf02"]??null;
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50
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```
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