Hariom
Prajapati
22 Jun 2022
HTMLIn this tutorial we will learn how to use select2 dropdown with validation using bootstrap 4.
Here we will take a example in which we use select2 dropdown with validation using bootstrap 4.
Let’s follow below step to use select2 dropdown using bootstrap.
<html>
<head>
<title>How to use Select2 DropDown With Validation using Bootstrap 4</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.0/select2.min.css" />
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.0/select2-bootstrap.min.css" />
<body>
<style type="text/css">
#select2Form .form-control-feedback {
z-index: 100;
}
.help-block {
color: red;
}
body {
background-color: #c0ed4d;
}
</style>
<div class="continer">
<div class="row mt-5 pt-5">
<div class="col-md-5 text-center offset-md-3 mt-5 pt-5">
<form id="select2Form" method="post" class="form-horizontal">
<label>
<h3>your Favorite</h3>
</label>
<select name="colors" class="form-control select2-select" multiple
data-placeholder="Choose 2-4 colors">
<option value="black">HTML</option>
<option value="blue">CSS</option>
<option value="green">JavaScript</option>
<option value="orange">PHP</option>
<option value="red">MySql</option>
<option value="yellow">bootstrap</option>
<option value="white">Jquery</option>
</select>
<div class="form-group mt-3">
<button type="submit" class="btn btn-success">Validate</button>
</div>
</form>
</div>
</div>
</div>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/3.5.0/select2.min.js"></script>
<script src="https://oss.maxcdn.com/jquery.bootstrapvalidator/0.5.2/js/bootstrapValidator.min.js"></script>
<script>
$(document).ready(function () {
$('#select2Form')
.find('[name="colors"]')
.select2()
// Revalidate the color when it is changed
.change(function (e) {
$('#select2Form').bootstrapValidator('revalidateField', 'colors');
})
.end()
.find('[name="colors-tags"]')
.select2({
// Specify tags
tags: ['Black', 'Blue', 'Green', 'Orange', 'Red', 'Yellow', 'White']
})
// Revalidate the color when it is changed
.change(function (e) {
$('#select2Form').bootstrapValidator('revalidateField', 'colors-tags');
})
.end()
.bootstrapValidator({
excluded: ':disabled',
feedbackIcons: {
valid: 'glyphicon glyphicon-ok',
invalid: 'glyphicon glyphicon-remove',
validating: 'glyphicon glyphicon-refresh'
},
fields: {
colors: {
validators: {
callback: {
message: 'Please choose 2-4 color you like most',
callback: function (value, validator) {
// Get the selected options
var options = validator.getFieldElements('colors').val();
return (options != null && options.length >= 2 && options.length <=
4);
}
}
}
},
'colors-tags': {
validators: {
callback: {
message: 'Please choose 2-4 color you like most',
callback: function (value, validator) {
// Get the selected options
var options = validator.getFieldElements('colors-tags').val(),
options2 = options.split(',');
return (options2 !== null && options2.length >= 2 && options2
.length <= 4);
}
}
}
}
}
});
});
</script>
</html>
Output
