Multiple Input Field Validation

This may be a stupid question but how do you add validation for multiple html fields to check if they are empty before submitting? I can retrieve the values of the fields but they need validation.

        title: 'Details',
        html:
            '<p style="float: left;" autofocus>Name:</p>' +
            '<input id="swal-input1" class="swal2-input">' +
            '<p style="float: left;">Email:</p>' +
            '<input id="swal-input2" class="swal2-input">' +
            '<p style="float: left;">Description:</p>'+
            '<input id="swal-input3" class="swal2-input">' +
            '<p style="float: left;">Notes:</p>' +
            '<input id="swal-input4" class="swal2-input">',

        preConfirm: function () {
            return new Promise(function (resolve) {
                resolve([
                    $('#swal-input1').val(),
                    $('#swal-input2').val(),
                    $('#swal-input3').val(),
                    $('#swal-input4').val()
                ])
            })
        }

[gverni]

@jesusaugusto0x2 @nhpm have a look to this example. Here we are validating that both username and password are not empty. You can replace that with whatever check you want to implement. The code for the example can be found here

[limonte]

Validation of multiple fields isn’t supported, you should implement it by yourself depending on your project.