Question

我在php中有一个包含验证码的表单。我需要使用jQuery验证验证码。如果验证码错误，表单会显示一条警告，说明您输入的验证码是错误的。请告诉我如何使用jQuery验证它。这是代码。当我添加下面的代码时，它显示错误未定义_SESSION。我该怎么解决这个问题。

请帮助我如何使用jQuery验证验证码

$(function() {
  $("#XISubmit").click(function(){
    var photo= document.forms["XIForm"]["photo"].value;
    var cap = '<?php echo $_SESSION["pass"]; ?>'   // try this
    if (photo==null || photo=="" || photo !=cap) { 
      alert("Please Enter captcha"); return false;
    } else {
      document.getElementById("XIForm").submit();
    }
  });
});

<div class="formLeft">
  <h4>Admission</h4>
  <form name="XIForm" id="XIForm" method="POST" action="pdf/pdf.php">
  <label>Security Validation</label>  
  <img src="captcha_image.php" alt=""/>
  <input  type="text" name="photo" maxlength="60" size="30"/>
  <br><br>
</form>

captcha_image.php

<?
// *** CAPTCHA image generation ***
// *** http://frikk.tk ***

session_start();

// *** Tell the browser what kind of file is come'n at 'em! ***
header("Content-Type: image/jpeg");

// *** Send a generated image to the browser ***
die(create_image());

// *** Function List ***
function create_image()
{
    // *** Generate a passcode using md5
    //  (it will be all lowercase hex letters and numbers ***
    $md5 = md5(rand(0,9999));
    $pass = substr($md5, 10, 5);

    // *** Set the session cookie so we know what the passcode is ***
    $_SESSION["pass"] = $pass;

    // *** Create the image resource ***
    $image = ImageCreatetruecolor(100, 20);

    // *** We are making two colors, white and black ***
    $clr_white = ImageColorAllocate($image, 255, 255, 255);
    $clr_black = ImageColorAllocate($image, 0, 0, 0);

    // *** Make the background black ***
    imagefill($image, 0, 0, $clr_black);

    // *** Set the image height and width ***
    imagefontheight(15);
    imagefontwidth(15);

    // *** Add the passcode in white to the image ***
    imagestring($image, 5, 30, 3, $pass, $clr_white);

    // *** Throw in some lines to trick those cheeky bots! ***
    imageline($image, 5, 1, 50, 20, $clr_white);
    imageline($image, 60, 1, 96, 20, $clr_white);

    // *** Return the newly created image in jpeg format ***
    return imagejpeg($image);

    // *** Just in case... ***
    imagedestroy($image);
}
?>

Answer 1

请检查是否已开始您的会话使用

session_start();

或检查$_SESSION["pass"]是否存储任何值

使用jQuery和php验证验证码

1 个答案: