jquery add attribute
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>jQuery Adding Attribute to HTML Element</title>
<script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>
<script>
$(document).ready(function(){
$(".add-attr").click(function(){
$('input[type="checkbox"]').attr("checked", "checked");
});
});
</script>
</head>
<body>
<button type="button" class="add-attr">Select Checkbox</button>
<input type="checkbox">
</body>
</html>