如何将java脚本提示msg变量值传递给php？

Question

how to pass java script prompt msg variable value in to php.

<?php 
  echo '<script type="text/javascript"> 
        var msg = window.prompt("Input a value", ""); alert(msg);
        </script>';    
   //then need to use input value to php    
   echo $value; //how to get JS value to here?
 ?>

or is there any other way to get php prompt massages to input value?

Answer 1

No, you can't do it directly like this. You need to pass the value from javascript to PHP. One easy way of doing so would be using redirect:

<?php 
  echo '<script type="text/javascript"> 
        var value = prompt("Input a value", "");
        window.location.href = '?value='+encodeURIComponent(value);
        </script>';    
   //then need to use input value to php    
  if (isset($_GET['value'])) {
    echo htmlspecialchars($value);
  }
 ?>

Even though this is very simple example based upon your code, there are more advanced ways of achieving your goal. But this is to get you going.

Answer 2

You cannot do that as php is a server side language, it is interpreted before any javascript.

What you need is using AJAX , or using a form .

Both can do the work, the difference is that with Ajax you won't have to reload the page (nor load any other).

Answer 3

You can try this

echo "<script>var email=prompt('Enter user mail')</script>";

$email="<script>document.write(email)</script>";