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Anonymous User

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01-Jun-2019 
JavaScript Captcha Example

<html>

<head><title>JavaScript Captcha Example</title></head>

<body onload="generateCaptcha()"> 

<script>
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));
 

 captcha=a.toString()+b.toString()+c.toString()+d.toString();	

    document.getElementById("captcha").value = captcha;
} 

function check(){

 var input=document.getElementById("inputText").value; 

 if(input==captcha){

  alert("Equal");

 }

 else{

  alert("Not Equal");

 }

}

</script> 

<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> 

</body>

</html>

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.

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