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small tweaks to reduce code duplication #4

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small tweaks to reduce code duplication #4

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65 changes: 31 additions & 34 deletions script.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@ let submitButton = document.getElementById('submitButton');
let output = document.getElementById('output');
let refreshButton = document.getElementById('refreshButton');

var captchaStr = "";


// alphaNums contains the characters with which you want to create the CAPTCHA
let alphaNums = ['A', 'B', 'C', 'D', 'E', 'F', 'G',
Expand All @@ -23,54 +25,49 @@ let alphaNums = ['A', 'B', 'C', 'D', 'E', 'F', 'G',
'x', 'y', 'z', '0', '1', '2', '3',
'4', '5', '6', '7', '8', '9'];

function generate_captcha() {
// This loop generates a random string of 7 characters using alphaNums
// Further this string is displayed as a CAPTCHA
let emptyArr = [];

for (let i = 1; i <= 7; i++) {
emptyArr.push(alphaNums[Math.floor(Math.random() * alphaNums.length)]);
}

captchaStr = emptyArr.join('');

ctx.clearRect(0, 0, captchaText.width, captchaText.height);
ctx.fillText(captchaStr, captchaText.width/4, captchaText.height/2);

// This loop generates a random string of 7 characters using alphaNums
// Further this string is displayed as a CAPTCHA
let emptyArr = [];
for (let i = 1; i <= 7; i++) {
emptyArr.push(alphaNums[Math.floor(Math.random() * alphaNums.length)]);
output.innerHTML = "";
}

generate_captcha();

function check_captcha() {
if (userText.value === captchaStr) {
output.className='correctCaptcha';
output.innerHTML = "Correct!";
} else {
output.className='incorrectCaptcha';
output.innerHTML = "Incorrect, please try again!";
}
}
var c = emptyArr.join('');
ctx.fillText(emptyArr.join(''), captchaText.width/4, captchaText.height/2);

// This event listener is stimulated whenever the user press the "Enter" button
// "Correct!" or "Incorrect, please try again!" message is
// displayed after validating the input text with CAPTCHA
userText.addEventListener('keyup', function(e) {
if (e.key === 'Enter') {
if (userText.value === c) {
output.classList.add("correctCaptcha");
output.innerHTML = "Correct!";
} else {
output.classList.add("incorrectCaptcha");
output.innerHTML = "Incorrect, please try again!";
}
check_captcha();
}
});

// This event listener is stimulated whenever the user clicks the "Submit" button
// "Correct!" or "Incorrect, please try again!" message is
// displayed after validating the input text with CAPTCHA
submitButton.addEventListener('click', function() {
if (userText.value === c) {
output.classList.add("correctCaptcha");
output.innerHTML = "Correct!";
} else {
output.classList.add("incorrectCaptcha");
output.innerHTML = "Incorrect, please try again!";
}
});
submitButton.addEventListener('click', check_captcha);

// This event listener is stimulated whenever the user press the "Refresh" button
// A new random CAPTCHA is generated and displayed after the user clicks the "Refresh" button
refreshButton.addEventListener('click', function() {
userText.value = "";
let refreshArr = [];
for (let j = 1; j <= 7; j++) {
refreshArr.push(alphaNums[Math.floor(Math.random() * alphaNums.length)]);
}
ctx.clearRect(0, 0, captchaText.width, captchaText.height);
c = refreshArr.join('');
ctx.fillText(refreshArr.join(''),captchaText.width/4, captchaText.height/2);
output.innerHTML = "";
});
refreshButton.addEventListener('click', generate_captcha);