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/*
Name: Quoc Phong Tran
Course: CST8285
Lab section: 321
Professor: Hala Own
File: script.js
Date Created: November 08, 2024
Description: JavaScript validation for a subscription form. It includes functions to validate email, username, and password fields, with real-time error highlighting and form reset handling.
*/
// Selecting input elements
letemailInput=document.querySelector("#email");
letloginInput=document.querySelector("#login");
letpasswordInput=document.querySelector("#pass");
letpasswordInput2=document.querySelector("#pass2");
letnewsletterInput=document.querySelector("#newsletter");
lettermInput=document.querySelector("#terms");
// Create error message elements for each input field and append them to the corresponding containers
letemailError=document.createElement("p");
emailError.setAttribute("class","warning");
document.querySelectorAll(".textfield")[0].append(emailError);
letloginError=document.createElement("p");
loginError.setAttribute("class","warning");
document.querySelectorAll(".textfield")[1].append(loginError);
letpasswordError=document.createElement("p");
passwordError.setAttribute("class","warning");
document.querySelectorAll(".textfield")[2].append(passwordError);
letpasswordError2=document.createElement("p");
passwordError2.setAttribute("class","warning");
document.querySelectorAll(".textfield")[3].append(passwordError2);
lettermError=document.createElement("p");
termError.setAttribute("class","warning");
document.querySelectorAll(".checkbox")[1].append(termError);
// Defining error messages for validation feedback
letemailErrorMsg=
"x Email address should be non-empty with the format xyx@xyz.xyz.";
letloginErrorMsg=
"x User name should be non-empty, and within 30 characters long.";
letpasswordErrorMsg=
"x Password should be at least 8 characters: 1 uppercase, 1 lowercase.";
letpasswordError2Msg="x Please retype password";
lettermErrorMsg="x Please accept the terms and conditions.";
letdefaultMsg="";
// Class name to highlight error inputs
letinputClassName="error-input-highlight";
// Function to validate email format
functionvalidateEmail(){
letemail=emailInput.value;
letregexp=/\S+@\S+\.\S+/;
returnregexp.test(email) ? defaultMsg : emailErrorMsg;
}
// Function to validate username length and non-emptiness
functionvalidateLogin(){
letlogin=loginInput.value;
returnlogin===""||login.length>=30 ? loginErrorMsg : defaultMsg;
}
// Function to validate password length
functionvalidatePassword(){
letpassword=passwordInput.value;
returnpassword===""||password.length<8 ? passwordErrorMsg : defaultMsg;
}
// Function to ensure both passwords match
functionvalidatePassword2(){
letpassword2=passwordInput2.value;
letpassword=passwordInput.value;
returnpassword2!==password||password2===""
? passwordError2Msg
: defaultMsg;
}
// Function to validate terms and conditions checkbox
functionvalidateTerms(){
returntermInput.checked ? defaultMsg : termErrorMsg;
}
// Display alert when the newsletter checkbox is selected
newsletterInput.addEventListener("click",()=>{
if(newsletterInput.checked){
alert("⚠️By subscribing, you may receive spam emails.");
}
});
// Functions to add and remove class name for error highlighting
functionremoveClassName(inputElement,className){
inputElement.classList.remove(className);
}
functionaddClassName(inputElement,className){
inputElement.classList.add(className);
}
// Function to highlight input fields with errors and set error messages
functionhighlightErrorInputField(inputElement,errorInput,errorMsg){
if(errorMsg===defaultMsg){
removeClassName(inputElement,inputClassName);
errorInput.textContent=defaultMsg;
}else{
addClassName(inputElement,inputClassName);
errorInput.textContent=errorMsg;
}
}
// Main validation function called on form submission
functionvalidate(){
letvalid=true;
letemailValidation=validateEmail();
highlightErrorInputField(emailInput,emailError,emailValidation);
if(emailValidation!==defaultMsg){
valid=false;
}
letloginValidation=validateLogin();
highlightErrorInputField(loginInput,loginError,loginValidation);
loginValidation!==defaultMsg
? (valid=false)
: (loginInput.value=loginInput.value.toLowerCase());
letpasswordValidation=validatePassword();
highlightErrorInputField(passwordInput,passwordError,passwordValidation);
if(passwordValidation!==defaultMsg){
valid=false;
}
letpassword2Validation=validatePassword2();
highlightErrorInputField(passwordInput2,passwordError2,password2Validation);
if(password2Validation!==defaultMsg){
valid=false;
}
lettermsValidation=validateTerms();
if(termsValidation!==defaultMsg){
termError.textContent=termsValidation;
valid=false;
}
returnvalid;
}
// Function to reset form errors when reset button is clicked
functionresetFormError(){
emailError.textContent=defaultMsg;
removeClassName(emailInput,inputClassName);
loginError.textContent=defaultMsg;
removeClassName(loginInput,inputClassName);
passwordError.textContent=defaultMsg;
removeClassName(passwordInput,inputClassName);
passwordError2.textContent=defaultMsg;
removeClassName(passwordInput2,inputClassName);
termError.textContent=defaultMsg;
}
// Event listener for resetting form errors
document.querySelector("form").addEventListener("reset",resetFormError);
// Event listeners for real-time validation on blur
emailInput.addEventListener("blur",()=>{
letx=validateEmail();
highlightErrorInputField(emailInput,emailError,x);
});
loginInput.addEventListener("blur",()=>{
letx=validateLogin();
highlightErrorInputField(loginInput,loginError,x);
});
passwordInput.addEventListener("blur",()=>{
letx=validatePassword();
highlightErrorInputField(passwordInput,passwordError,x);
});
passwordInput2.addEventListener("blur",()=>{
letx=validatePassword2();
highlightErrorInputField(passwordInput2,passwordError2,x);
});
// Event listener to clear error message for terms checkbox when checked
termInput.addEventListener("change",function(){
if(this.checked){
termError.textContent=defaultMsg;
}
});