当我在数字1和数字2中输入数值时,按“添加”。它不显示总附加值。请看下面我的编码。告诉我,问题是什么,能做什么。

<html>
<head>
<title>Simple Calculator</title>
<?php
    if(isset($_POST['submitted'])){
        if(is_numeric($_POST['number1']) && is_numeric($_POST['number2'])){
        $add = ($_POST['number1'] + $_POST['number2']);
            echo "Add: ".$_POST['number1']."+".$_POST['number2']."=";
            }
        }



?>
<script type="text/javascript">


</script>
</head>

<body>
<h1>Simple Calculator</h1>
<form action="simple_calculator.php" method="post">
<p>Number 1: <input type="text" name="number1" size="20" value="<?php if(isset($_POST['number1'])) echo $_POST['number1'];?>"/></p>
<p>Number 2: <input type="text" name="number2" size="20" value="<?php if(isset($_POST['number2'])) echo $_POST['number2'];?>"/></p>

          <input type="button" name="add" value="Add" />
          <input type="button" name="minus" value="Minus" />
          <input type="button" name="multiply" value="Multiply" />
          <input type="button" name="divide" value="Divide" />
          <input type="reset" name="rest" value="Reset" />
          <input type="hidden" name="submitted" value="TRUE" />


</form>

</body>
</html>

最佳答案

您正在将结果数据回显到<head>,因此它将不会显示。
你忘了回显$add
您的<input>button类型而不是submit,因此不会将表单提交到服务器。
因为您在表单中回显先前输入的值,<input type="reset">可能不会执行您希望/期望它执行的操作。我认为最好将其作为另一个submit来实现。
由于此表单只影响下一页显示的内容,并且不会对服务器进行永久性更改,因此应使用GET方法而不是POST
试试这个:

<html>
  <head>
    <title>Simple Calculator</title>
    <script type="text/javascript"></script>
  </head>
  <body>
    <h1>Simple Calculator</h1>
    <form action="simple_calculator.php" method="get">
      <p>Number 1: <input type="text" name="number1" size="20" value="<?php if (isset($_GET['number1']) && !isset($_GET['reset'])) echo $_GET['number1'];?>"/></p>
      <p>Number 2: <input type="text" name="number2" size="20" value="<?php if (isset($_GET['number2']) && !isset($_GET['reset'])) echo $_GET['number2'];?>"/></p>
      <input type="submit" name="add" value="Add" />
      <input type="submit" name="minus" value="Minus" />
      <input type="submit" name="multiply" value="Multiply" />
      <input type="submit" name="divide" value="Divide" />
      <input type="submit" name="reset" value="Reset" />
      <input type="hidden" name="submitted" value="1" />
    </form>
    <?php

        if (isset($_GET['submitted']) && !isset($_GET['reset'])) {

            echo "<div>";

            if (is_numeric($_GET['number1']) && is_numeric($_GET['number2'])) {

                if (isset($_GET['add'])) {

                    $result = $_GET['number1'] + $_GET['number2'];
                    echo "Add: ".$_GET['number1']." + ".$_GET['number2']." = ".$result;

                } else if (isset($_GET['minus'])) {

                    $result = $_GET['number1'] - $_GET['number2'];
                    echo "Minus: ".$_GET['number1']." - ".$_GET['number2']." = ".$result;

                } else if (isset($_GET['multiply'])) {

                    $result = $_GET['number1'] * $_GET['number2'];
                    echo "Multiply: ".$_GET['number1']." * ".$_GET['number2']." = ".$result;

                } else if (isset($_GET['divide'])) {

                    $result = $_GET['number1'] / $_GET['number2'];
                    echo "Divide: ".$_GET['number1']." / ".$_GET['number2']." = ".$result;

                }

            } else {

                echo "Invalid input";

            }

            echo "</div>";

        }

    ?>
  </body>
</html>

关于php - PHP粘性表格,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/10968911/

10-11 11:46