login validation in javascript code example
Example 1: javascript login validation
<html>
<body>
<form id="form1" runat="server">
<div class="container">
<div class="main">
<h2>
Javascript Login Form Validation</h2>
<form id="form_id" method="post" name="myform">
<label>
User Name :</label>
<input type="text" name="username" id="username" />
<br><br>
<label>
Password :</label>
<input type="password" name="password" id="password" />
<input type="button" value="Login" id="submit" onclick="validate();" />
</form>
</div>
</div>
</form>
</html>
</body>
Example 2: how to set validation for email in javascript
<script language="javascript">
function checkEmail() {
var email = document.getElementById('txtEmail');
var filter = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
if (!filter.test(email.value)) {
alert('Please provide a valid email address');
email.focus;
return false;
}
}</script>
Example 3: form validation for email in js
<script>
function validateform(){
var name=document.myform.name.value;
var password=document.myform.password.value;
if (name==null || name==""){
alert("Name can't be blank");
return false;
}else if(password.length<6){
alert("Password must be at least 6 characters long.");
return false;
}
}
Example 4: javascript login validation
<script language = "JavaScript">
function validate() {
var username = document.getElementById("username").value;
var password = document.getElementById("password").value;
if (username == null || username == "") {
alert("Please enter the username.");
return false;
}
if (password == null || password == "") {
alert("Please enter the password.");
return false;
}
alert('Login successful');
}
</script>