Transform select element into an input step.
Include jquery-select-step.css from folder dist.
<link rel="stylesheet" href="./dist/jquery-select-step.css">Include jquery-select-step.js from folder dist.
<script src="./dist/jquery-select-step.js"></script>Call the plugin on your script.
jQuery(".select-element").selectStep({
incrementLabel: "+",
decrementLabel: "-",
onChange: function(value) {
console.log(value, "value");
}
});