JSFiddle - React, Tailwind, and code Playground

by gustavox

HTML

<label class="control-label" for="var3">
<select class="form-control select select-primary select-exemploa" data-toggle="select" name="tvar3" id="var3">
<option>Selecione um valor</option>
<option value="value1">value1</option>
<option value="value2">value2</option>
</select>
</label>
<div id="div1" style="display:none;">div escondida</div>

JavaScript

if (2 > 1){
    $("#var3").val('value2');
}

$('#var3').change(function() {
    if ($(this).val() == 'value2') {
        $("#div1").show();
    }
    else {
     $("#div1").hide();
    }
});