I have describe in previous post about Captcha and its application. Now I will implement Captcha using javascript.
Read: WHAT IS CAPTCHA AND ITS APPLICATION
It is very simple to implement Captcha using javascript. Follow the code bellow.
Read: WHAT IS CAPTCHA AND ITS APPLICATION
It is very simple to implement Captcha using javascript. Follow the code bellow.
<html>
<head>
<title>Captcha</title>
<script type="text/javascript">
//Created / Generates the captcha function
function DrawCaptcha()
{
var a = Math.ceil(Math.random() * 10)+ '';
var b = Math.ceil(Math.random() * 10)+ '';
var c = Math.ceil(Math.random() * 10)+ '';
var d = Math.ceil(Math.random() * 10)+ '';
var e = Math.ceil(Math.random() * 10)+ '';
var f = Math.ceil(Math.random() * 10)+ '';
var g = Math.ceil(Math.random() * 10)+ '';
var code = a + ' ' + b + ' ' + ' ' + c + ' ' + d + ' ' + e + ' '+ f + ' ' + g;
document.getElementById("txtCaptcha").value = code
}
// Validate the Entered input aganist the generated security code function
function ValidCaptcha(){
var str1 = removeSpaces(document.getElementById('txtCaptcha').value);
var str2 = removeSpaces(document.getElementById('txtInput').value);
if (str1 == str2) return true;
return false;
}
// Remove the spaces from the entered and generated code
function removeSpaces(string)
{
return string.split(' ').join('');
}
</script>
</head>
<body onload="DrawCaptcha();">
<table>
<tr>
<td>
Human Check..Please Enter The bellow code<br />
</td>
</tr>
<tr>
<td>
<input type="text" id="txtCaptcha"
style="text-align:center; border:none;
font-weight:bold; font-family:Modern" readonly/>
<input type="button" id="btnrefresh" value="Refresh" onclick="DrawCaptcha();" />
</td>
</tr>
<tr>
<td>
<input type="text" id="txtInput"/>
</td>
</tr>
<tr>
<td>
<input id="Button1" type="button" value="Check" onclick="alert(ValidCaptcha());"/>
</td>
</tr>
</table>
</body>
</html>
DEMO
|
Human Check..Please Enter The bellow code |
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