I have problem because I don't know how to change code to add counter in name input. So when I will click #add_input new input will have name name[0], name[1] etc.
$("#add_input").click(function () {
var html = '';
html += '<div class="row">';
html += '<input type="checkbox" name="name[0]">';
html += '</div></div>';
};
try this
let i = 0
$("#add_input").click(() => {
i += 1;
var html = `<div class="row">
<label><input type="checkbox" name="name[]"> input ${i}</label>
</div>`;
$('#result').append(html);
})<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<button id="add_input">add input</button>
<div id="result"></div>var counter = 0;
$("#add_input").click(function () {
var html = '';
html += '<div class="row">';
html += '<input type="checkbox" name="name_' + counter + '"/>';
html += '</div>';
counter ++;
};