無需單擊單個按鈕即可自動添加兩個輸入值的總和-有解無憂

我已經嘗試了所有可用的代碼，但沒有任何效果。這是代碼：

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
    
<script>
var text1 = document.getElementById("inhouse");
var text2 = document.getElementById("sahodaya");

function showsum() {
   var first_number = parseFloat(text1.value);
   if (isNaN(first_number)) first_number = 0;
   var second_number = parseFloat(text2.value);
   if (isNaN(second_number)) second_number = 0;
   var result = first_number   second_number;
   document.getElementById("total").value = result;
}
</script>
    <title>Sahodaya 25 Report - Form</title>
  </head>
  <body>
    <div class = "container my-3">
        <form method="POST">
<fieldset disabled>
    <div class="mb-3">
      <label for="disabledTextInput" class="form-label">Name</label>
      <input type="text" id="disabledTextInput" class="form-control" placeholder="<?php echo $_SESSION['name']?>" name = "name" value="<?php echo $_SESSION['name']?>">
      
      
      <label for="disabledTextInput2" class="form-label my-2">Email</label>
      <input type="text" id="disabledTextInput2" class="form-control" placeholder="<?php echo $_SESSION['email']?>" name = "email" value="<?php echo $_SESSION['email']?>">
      
      </fieldset>
      <label for="inhouse" class="form-label">Inhouse Training Done In Hours</label>
      <input type="number" id="inhouse" class="form-control" placeholder="Type Here" name = "inhouse" required oninput="showsum()"><br>
      
      <label for="sahodaya" class="form-label">Sahodaya Training Done In Hours</label>
      <input type="number" id="sahodaya" class="form-control" placeholder="JSSC   PSCC (Both)" name = "sahodaya" oninput="showsum()" required><br>
      
      <label for="total" class="form-label">Total Hours Done</label>
      <input type="number" id="total" class="form-control" name = "total" value="0"><br>
      
  <button type="submit" class="btn btn-primary">Submit</button>
</form>
    </div>

    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: Bootstrap Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg OMhuP IlRH9sENBO0LRn5q 8nbTov4 1p" crossorigin="anonymous"></script>
    <!-- Option 2: Separate Popper and Bootstrap JS -->
    <!--
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/[email protected]/dist/umd/popper.min.js" integrity="sha384-7 zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG 2QOK9T ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
    -->
  </body>
</html>

但是這段代碼不是作業我嘗試了到目前為止我看到的 Stack Overflow 上所有可用的解決方案，但沒有什么幫助所以如果有人可以提供幫助，我會發布這個。

我想在內部和 sahodya 中添加值并將其顯示在總輸入欄位中。

但是當我運行它時它不是作業。我該如何解決這個錯誤。

uj5u.com熱心網友回復：

試試下面的代碼。它應該解決問題。

完整的作業代碼片段：

<!doctype html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <!-- Bootstrap CSS -->
  <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">

  <script>
    function add_number() {
      var first_number = parseFloat(document.getElementById("inhouse").value);
      if (isNaN(first_number)) first_number = 0;
      var second_number = parseFloat(document.getElementById("sahodaya").value);
      if (isNaN(second_number)) second_number = 0;
      var result = first_number   second_number;
      document.getElementById("total").value = result;
    }
  </script>
  <title>Sahodaya 25 Report - Form</title>
</head>

<body>
  <div class="container my-3">
    <form method="POST">
      <fieldset disabled>
        <div class="mb-3">
          <label for="disabledTextInput" class="form-label">Name</label>
          <input type="text" id="disabledTextInput" class="form-control" placeholder="<?php echo $_SESSION['name']?>" name="name" value="<?php echo $_SESSION['name']?>">


          <label for="disabledTextInput2" class="form-label my-2">Email</label>
          <input type="text" id="disabledTextInput2" class="form-control" placeholder="<?php echo $_SESSION['email']?>" name="email" value="<?php echo $_SESSION['email']?>">

      </fieldset>
      <label for="inhouse" class="form-label">Inhouse Training Done In Hours</label>
      <input type="number" id="inhouse" class="form-control" placeholder="Type Here" name="inhouse" required onkeyup="add_number()"><br>

      <label for="sahodaya" class="form-label">Sahodaya Training Done In Hours</label>
      <input type="number" id="sahodaya" class="form-control" placeholder="JSSC   PSCC (Both)" name="sahodaya" onkeyup="add_number()" required><br>

      <label for="total" class="form-label">Total Hours Done</label>
      <input type="number" id="total" class="form-control" name="total" value="0"><br>

      <button type="submit" class="btn btn-primary">Submit</button>
    </form>
    </div>

    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: Bootstrap Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg OMhuP IlRH9sENBO0LRn5q 8nbTov4 1p" crossorigin="anonymous"></script>
    <!-- Option 2: Separate Popper and Bootstrap JS -->
    <!--
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/[email protected]/dist/umd/popper.min.js" integrity="sha384-7 zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG 2QOK9T ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
    -->
</body>

</html>

uj5u.com熱心網友回復：

您應該將 document.getElementById 呼叫包裝在函式內，或者應該將腳本塊移動到表單下方。

您的檔案將由瀏覽器逐行呈現。因為你在表單元素之前有你的腳本標簽。呼叫時元素不可用，document.getElementById("inhouse")因此 varfirst_number未定義，并且在呈現表單時元素將可用。但是你的 var 仍然是未定義的。這就是你的代碼沒有被執行的原因。

我還將您的函式重構為箭頭函式并洗掉了一些不必要的方法。

<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-1BmE4kWBq78iYhFldvKuhfTAU6auU8tT94WrHftjDbrCEXSU1oBoqyl2QvZ6jIW3" crossorigin="anonymous">
    <title>Sahodaya 25 Report - Form</title>
  </head>
  <body>
    <div class = "container my-3">
        <form method="POST">
<fieldset disabled>
    <div class="mb-3">
      <label for="disabledTextInput" class="form-label">Name</label>
      <input type="text" id="disabledTextInput" class="form-control" placeholder="<?php echo $_SESSION['name']?>" name = "name" value="<?php echo $_SESSION['name']?>">
      
      
      <label for="disabledTextInput2" class="form-label my-2">Email</label>
      <input type="text" id="disabledTextInput2" class="form-control" placeholder="<?php echo $_SESSION['email']?>" name = "email" value="<?php echo $_SESSION['email']?>">
      
      </fieldset>
      <label for="inhouse" class="form-label">Inhouse Training Done In Hours</label>
      <input type="number" id="inhouse" class="form-control" placeholder="Type Here" name = "inhouse" required oninput="showSum()"><br>
      
      <label for="sahodaya" class="form-label">Sahodaya Training Done In Hours</label>
      <input type="number" id="sahodaya" class="form-control" placeholder="JSSC   PSCC (Both)" name = "sahodaya" oninput="showSum()" required><br>
      
      <label for="total" class="form-label">Total Hours Done</label>
      <input type="number" id="total" class="form-control" name = "total" value="0" disabled><br>
      
  <button type="submit" class="btn btn-primary">Submit</button>
</form>
    </div>

        
<script>
    var text1 = document.getElementById("inhouse");
    var text2 = document.getElementById("sahodaya");
    var resultField = document.getElementById("total");
    const showSum = () => {
       resultField.value = Number(text1.value)   Number(text2.value);
    }
    </script>

    <!-- Optional JavaScript; choose one of the two! -->

    <!-- Option 1: Bootstrap Bundle with Popper -->
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-ka7Sk0Gln4gmtz2MlQnikT1wXgYsOg OMhuP IlRH9sENBO0LRn5q 8nbTov4 1p" crossorigin="anonymous"></script>
    <!-- Option 2: Separate Popper and Bootstrap JS -->
    <!--
    <script src="https://cdn.jsdelivr.net/npm/@popperjs/[email protected]/dist/umd/popper.min.js" integrity="sha384-7 zCNj/IqJ95wo16oMtfsKbZ9ccEh31eOz1HGyDuCQ6wgnyJNSYdrPa03rtR1zdB" crossorigin="anonymous"></script>
    <script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js" integrity="sha384-QJHtvGhmr9XOIpI6YVutG 2QOK9T ZnN4kzFN1RtK3zEFEIsxhlmWl5/YESvpZ13" crossorigin="anonymous"></script>
    -->
  </body>
</html>

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