Question

我有4个单选按钮+，-，*，/我打算如果选择+它会添加结果在两个文本框中显示它并将其显示到第三个texbox，因此如果我选择-符号，它将减去两个texbox并将其显示到第三个文本框，依此类推。任何帮助都将不胜感激。 this is the picture

 <html>
    <body>
    <?php
      function add($x,$y){

           $add=$x + $y;
           return $add;

       }
       function subtract($x,$y){

           $subtract=$x - $y;
           return $subtract;

       }
       function multiply($x,$y){

           $multiply=$x * $y;
           return $multiply;

       }
       function divide($x,$y){

           $divide=$x / $y;
           return $divide;

       }

    ?>
    <form action="#" method="post">
    Num1:<input name="num1"><br>
    <input type='radio'  name='express' value='add'>+
    <input type='radio'  name='express' value='subtract'>-
    <input type='radio'  name='express' value='multiply'>*
    <input type='radio'  name='express' value='divide'>/
    <br>
    Num2:<input name="num2"> 
    Result<input value='<?php



    ?>'>
    <input type="submit" name="submit">
    </form>
    <?php


       if(isset($_POST['submit'])){
           $x=$_POST['num1'];
           $y=$_POST['num2'];
           $z=$_POST['express'];
           if($z == 'add'){
               echo add($x,$y);  
           }
           else if($z=='subtract'){
               echo subtract($x,$y);

           }
           else if($z=='multiply'){
               echo multiply($x,$y);

           }
           else{
               echo divide($x,$y);

           }

       }

    ?>
    </body>
    </html>

Answer 1

<html>
<body>
<?php
   $Result = '';

   if(isset($_POST['submit'])){
       $num1    = $_POST['num1'];
       $num2    = $_POST['num2'];
       $express = $_POST['express'];
       switch ($express) {
        case 'add':
           $Result = $num1 + $num2;
           break;

        case 'subtract':
           $Result = $num1 - $num2;
           break;

        case 'multiply':
           $Result = $num1 * $num2;
           break;

        case 'divide':
           if(0 != $num2 ){
            $Result = $num1 / $num2;
          }
          break;

         default:
           break;
       }  

   }

?>
<form action="#" method="post">
Num1:<input name="num1"><br>
<input type='radio'  name='express' value='add'>+
<input type='radio'  name='express' value='subtract'>-
<input type='radio'  name='express' value='multiply'>*
<input type='radio'  name='express' value='divide'>/
<br>
Num2:<input name="num2"> 
Result<input value='<?php echo $Result;?>'>
<input type="submit" name="submit">
</form>
</body>
</html>

我建议您使用JavaScript并将PHP代码与HTML代码分开来实现它。

Answer 2

这是一个jQuery版本。我确信在jQuery中比我更熟练的人可以制作更精明的版本：

<强>演示：

http://jsfiddle.net/pn1v1az7/4/

<强> jQuery的：

function CalculateVals(Obj)
{
    // Set default value as 0
    var Result  =   0;
    // Get the value of the checked radio box
    var UseOpr  =   $("input[name='express']:checked").val();
    // Get the value of input num1
    var n1      =   $("input[name='num1']").val();
    // Get the value of input num2
    var n2      =   $("input[name='num2']").val();
    // See if the value for one is numeric, if not make it 0
    var Num1    =   (!isNaN(n1))? n1:0;
    // Same as above
    var Num2    =   (!isNaN(n2))? n2:0;
    // Loop through to find the operator being used
    switch(UseOpr) {
        case('+'):
            // Using the plus like "+Num1" converts string to number, just in case...
            Result = +Num1 + +Num2;
            break;
        case('-'):
            Result = +Num1 - +Num2;
            break;
        case('*'):
            Result = +Num1 * +Num2;
            break;
        case('/'):
            Result = +Num1 / +Num2;
    }
  // Insert the mathematical result into box 3
  $("#result").val(Result);
}

// If the form changes
$("form").change(function() {
    // Run the above calculation function by passing the form as an argument
    CalculateVals($(this));
});

<强>形式：

<form action="#">
    Num1:<input name="num1"><br>
    <input type='radio'  name='express' value='+' />+
    <input type='radio'  name='express' value='-' />-
    <input type='radio'  name='express' value='*' />*
    <input type='radio'  name='express' value='/' />/
    <br>
    Num2:<input name="num2" /> 
    Result<input id="result" name="result" value="0">
</form>

PHP如何使结果的值显示在文本框中

2 个答案: