Create a JavaScript Captcha Example for Learning...

Posted by  Sanat Shukla
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  1. Create a JavaScript Captcha Example for Learning...

    JavaScript Captcha Example
    <head><title>JavaScript Captcha Example</title></head>
    <body onload="generateCaptcha()">
    var captcha;
    function generateCaptcha() {
        var a = Math.floor((Math.random() * 10));
        var b = Math.floor((Math.random() * 10));
        var c = Math.floor((Math.random() * 10));
        var d = Math.floor((Math.random() * 10));

        document.getElementById("captcha").value = captcha;
    function check(){
     var input=document.getElementById("inputText").value;
      alert("Not Equal");
    <input type="text" id="captcha" disabled/><br/><br/>
    <input type="text" id="inputText"/><br/><br/>
    <button onclick="generateCaptcha()">Refresh</button>
    <button onclick="check()">Submit</button>

    Note: Please don’t use this method in live web projects because this implementation is already readable by the attacker and he/she can manipulate it. Everything should be processed on the server side. You can just use this captcha generation method in your school or college projects.