JavaScript Form Validation
hello guys in this tutorial i'm going to show you form validation using
javascript
step 1:
create index.html file
step 2:
create validate.js
here is the code
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>validation</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
<style>
body{
font-size: 18px;
text-transform: capitalize;
margin: 20px;
}
#success{
color:green;
}
#warn{
color: red;
}
</style>
<h1>js validation</h1>
<form action=""autocomplete="off">
<div class="form-group">
<label for="">name</label>
<input type="text" class="form-control" id="name">
<span id="name-error"></span>
</div>
<div class="form-group">
<label for="">phone number</label>
<input type="text" class="form-control" id="number">
<span id="number-error"></span>
<div class="form-group">
<input type="submit" class="btn btn-primary"id="submit" disabled>
</div>
</form>
</body>
<script src="validate.js"></script>
</html>
validate.js
var btn=document.querySelector("#submit");
var names=document.getElementById("name");
var number=document.querySelector("#number");
var name_alert=document.querySelector("#name-error");
var number_alert=document.querySelector("#number-error");
names.addEventListener('keypress', function(e){
console.log(names.value);
let newname=names.value;
console.log(newname);
if(newname.length>8)
{
name_alert.innerHTML=`<p id="success">valid name </p>`;
btn.removeAttribute("disabled");
}
else{
name_alert.innerHTML=`<p id="warn">password length should be 8</p>`;
btn.setAttribute("disabled", true);
}
});
number.addEventListener('keyup', function(){
let newnumber=number.value;
//alert("asdf");
var pattern = /^[6-9]\d{9}$/ ;
if(pattern.test(newnumber))
{
number_alert.innerHTML=`<p id="success">valid number </p>`;
btn.removeAttribute("disabled");
}
else{
number_alert.innerHTML=`<p id="warn">phone number should be 10</p>`;
btn.setAttribute("disabled", true);
}
})
btn.addEventListener('click',function()
{
alert("click");
})
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If you have any doubts, Please let me know
Thanks!