Input 1
    <input type="hidden" value="1" class="testfieldvalue">
    <div class="testfieldshow" name="testfieldshow" style="display: none">
        <label class="Field_1_label" style="display: none">Field 1</label>
        <input type="text" class="Field_1" name ="Field_1" style="display: none">
        <label class="Field_2_label" style="display: none">Field 2</label>
        <input type="text" class="Field_2" name ="Field_2" style="display: none">
    </div>
    <br>
    Input 2
    <input type="hidden" value="2" class="testfieldvalue">
    <div class="testfieldshow" name="testfieldshow" style="display: none">
        <label class="Field_1_label" style="display: none">Field 1</label>
        <input type="text" class="Field_1" name ="Field_1" style="display: none">
        <label class="Field_2_label" style="display: none">Field 2</label>
        <input type="text" class="Field_2" name ="Field_2" style="display: none">
    </div>

<script>
    var testfieldvalue = document.getElementsByClassName("testfieldvalue")[0].value;
    var testfieldshow = document.getElementsByClassName("testfieldshow")[0];
    var field1 = document.getElementsByClassName("Field_1")[0];
    var field1label = document.getElementsByClassName("Field_1_label")[0];
    var field2 = document.getElementsByClassName("Field_2")[0];
    var field2label = document.getElementsByClassName("Field_2_label")[0];


    $(".testfieldvalue[value]").each(function(){
     var testfield = ($(this).attr('value'));
     if (testfield == '1') {
        testfieldshow.style.display = '';
        field1.style.display = '';
        field1label.style.display = '';
     } else if (testfield == '2') {
        testfieldshow.style.display = '';
        field1.style.display = '';
        field1label.style.display = '';
        field2.style.display = '';
        field2label.style.display = '';
     }
    });
    </script>