javascrpt captcha

<html>
<head>
<title>Captcha</title>
   
    <script type="text/javascript">

   //Created / Generates the captcha function   
    function DrawCaptcha()
    {
       var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz";
       var string_length =6;
       var randomstring = '';
    for (var i=0; i<string_length; i++) {
        var rnum = Math.floor(Math.random() * chars.length);
        randomstring += chars.substring(rnum,rnum+1);
          }
      
        document.getElementById("txtCaptcha").value = randomstring
    }

    // 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;       
        else
        {
            alert("Invalid captcha value");
        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>
        Welcome To Captcha<br />
    </td>
</tr>
<tr>
    <td>
        <input type="text" id="txtCaptcha" disabled="true"
            style="background-image:url(captcha_bg.jpg); text-align:center; border:none;
            font-weight:bold; font-family:Arial, Helvetica, sans-serif; font-size:16px;line-height:12px;" />
        <input type="button" id="btnrefresh" value="Refresh"  onClick="DrawCaptcha();return false;" />
    </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>

Comments

Post a Comment

Popular posts from this blog

php format date string short month

As you can see in our last example there are tons of different formats that can be used in the date feature. Below is a summary of the variable used in date, and what each does. Remember they ARE CaSe sEnsItIVe: DAYS   d - day of the month 2 digits (01-31)   j - day of the month (1-31)   D - 3 letter day (Mon - Sun)   l - full name of day (Monday - Sunday)   N - 1=Monday, 2=Tuesday, etc (1-7)   S - suffix for date (st, nd, rd)   w - 0=Sunday, 1=Monday (0-6)   z - day of the year (1=365) WEEK   W - week of the year (1-52) MONTH   F - Full name of month (January - December) m - 2 digit month number (01-12)   n - month number (1-12)   M - 3 letter month (Jan - Dec)   t - Days in the month (28-31) YEAR L - leap year (0 no, 1 yes) o - ISO-8601 year number (Ex. 1979, 2006) Y - four digit year (Ex. 1979, 2006) y - two digit year (Ex. 79, 06) TIME a - am or pm A - AM or PM B - Swatch Internet time (...
Read more

Android Interview Questions and Answers

Image
Android Interview Questions and Answers Describe Android Application Architecture. Android Application Architecture has the following components: • Services – like Network Operation • Intent – To perform inter-communication between activities or services • Resource Externalization – such as strings and graphics • Notification signaling users – light, sound, icon, notification, dialog etc. • Content Providers – They share data between applications Describe a real time scenario where android can be used? Imagine a situation that you are in a country where no one understands the language you speak and you can not read or write. However, you have mobile phone with you. With a mobile phone with android, the Google translator translates the data of one language into another language by using XMPP to transmit data. You can type the message in English and select the language which is understood by the citizens of the country in order to reach the message to the citizens. What’s the difference ...
Read more

Soap and Rest Example

SOAP Pros: ·          Langauge, platform, and transport agnostic ·          Designed to handle distributed computing environments ·          Is the prevailing standard for web services, and hence has better support from other standards (WSDL, WS-*) and tooling from vendors ·          Built-in error handling (faults) ·          Extensibility Cons: ·          Conceptually more difficult, more "heavy-weight" than REST ·          More verbose ·          Harder to develop, requires tools REST Pros: ·          Language and platform agnostic ·          Much ...
Read more