我如何知道输入电子邮件是否对 jquery 有价值？

Question

I try find a way of know if my input email has some values its in.

I tried this code:

 var empty = true; //get value from my input type email $('input[type="email"]').each(function() { //check out if I have some values its in if ($(this).val()!="") { // if my input is empty then its should return this //redefined my var with false empty = false; //return a console saying that my input is empty return console.log("empty yep"); } });

what do I trying do?

I try create a login that when I put something over the input password my javascript detect if I have something in email if I do not have nothing then dont allow continue with the process login in my system without before put the email

some idea?

Answer 1

Based on my understanding, You need to validate the email to enter the next password input box.

So I have made the password input disabled unless something is entered into email input box.

Using email.nextElementSibling.setAttribute('disabled',true); made the password field as disabled.

Then if you start entering into email then the password field will get enabled.

 const email = document.querySelector('input[type="email"]'); checkEmailValidation = () => { if(email.value){ email.nextElementSibling.removeAttribute("disabled"); } else { email.nextElementSibling.setAttribute('disabled',true); } } email.addEventListener('input', checkEmailValidation); checkEmailValidation();

 <input type="email" placeholder="Type email here"> <input type="password" placeholder="Type password here">

Answer 2

Add jquery library in head section of HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

then add an input tag in HTML code as below

<form name="form" action="" method="" onsubmit="validate()">
    <input type="email" name="email" id="email" value="" required>
</form>

then in jquery please paste the below code

if($('#email').val() == '') {
    alert('please provide the email').
    event.preventDefault();
    return false;
}

Note: you can even validate the email id.