How to validate text box in order to avoiding empty box using jquery

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whenever i clicked the submit button the txtbox contains something in that,if i submit the button when txtbox is empty alert will come with text of text box is not empty and also textbox values are unique (avoiding duplicates) in the database

What I have tried:

html

Features_Name:

javascript

$(document).ready(function () {
$('.submit').attr('disabled', true);
$('#txtName').keyup(function () {
if ($.trim($(this).val.length != 0)) {
$('.submit').attr('disabled', false);
}
else if ($.trim($('#txtName').val.length =="0")) {
alert('Features_Name is not empty');
}
else {
$('.submit').attr('disabled', true);
}

})
})

Posted 1-Jan-17 19:35pm

Devaraneni Laxman Rao

Updated 1-Jan-17 20:00pm

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Peter Leow · Accepted Answer · 2017-01-01T20:00:00

For client-side validation, check out this demo:

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Demo</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("#myForm").submit(function(){
	  var isValid = true;
  
	  if($("#txtName").val().trim().length == 0) {
		  isValid = false;
		alert("Name cannot be empty!");
  
	  }
	  return isValid;
  });
});
</script>
</head>
<body>

<form id="myForm" action="#" method="post">

<input type="text" id="txtName">

<input type="submit" value="Send">

</form>

</body>
</html>

JSFiddle[^]

As regards to:

Quote:
textbox values are unique (avoiding duplicates) in the database

That can only be done on the server-side by checking the value against the database content.