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我在php中有一個包含驗證碼的表單。我需要使用jQuery驗證驗證碼。如果驗證碼錯誤,則表單顯示警報,說明您輸入的驗證碼是錯誤的。請告訴我如何使用jQuery驗證它。這裏是代碼。當我添加下面的代碼時,它顯示錯誤未定義_SESSION。我該如何解決這個問題。使用jQuery和php驗證驗證碼
請幫助我,我怎麼能使用jQuery
$(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);
}
?>