Hi,
The following code creates a Captcha for Sharepoint Visual Web Part.
Add this code to design part:
<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><table><tr><td><input type="text" id="txtCaptcha"
style="background-image:url(1.jpg); text-align:center; border:none;
font-weight:bold; font-family:Modern" /><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>This code is for calling js function on page load:
protected void Page_Load(object sender, EventArgs e)
{Page.ClientScript.RegisterStartupScript(GetType(), "MyKey", "DrawCaptcha();", true);
}Melih Şimşek / Bilkent University