How to iterate over each select element in a dynam

Question

I saw this post for cloning form fields with incrementing ids - works great.

But, in my adaptation, I have added a select box in the cloned form. The select box's id increments as it should. The goal is that when a particular choice (always the same in every cloned field) is selected, some hidden inputs are revealed.

I can do this with javascript for a set # of known select elements, but I can't figure out how to iterate of each cloned select, since the user can create as many as they need?

A simple version is thus:

HTML

<div id="zero_form" style="display:none;">
    <p>
        <input id='box1_' type="text" style="width:125px" placeholder='Type'>
        <br>
        <select id='box2_' class="first_input" style="width: 200px;" placeholder="Choose a Value">
            <option value="Choose a Value">Choose a Value</option>
            <option>NEGATIVE</option>
            <option>EQUIVOCAL</option>
            <option>POSITIVE</option>
        </select>
        <input id='box3_' style='display:none;' placeholder='Score #1'>
        <input id='box4_' style='display:none;' placeholder='Score #2'>
        <input id='box5_' style='display:none;' placeholder='%'>
        <input id='box6_' type="text"  placeholder="Enter Comments" style="width:200px">
        <input type="button" id="remove" class="removebutton" value="Delete">
        <br>
    </p>
</div>
<!-- end hidden clone div-->
<form>
    <p> 
        <span id="add" class="addbutton">Add another row</span>
    </p>
</form>

jQuery

 $(document).ready(function () {
    // show hidden inputs on POSITIVE selection
    $('input [type=select]').each(function(){
        var sel = $(this).val();
        if (sel == 'POSITIVE'){
            $(this).parent().find('[type=text]').show();}
        else {
            $(this).parent().find('[type=text]').hide();}
              });

   // clone fields  
    var form_index = 0;
    $("#add").click(function () {
        form_index++;
        $(this).parent().before($("#zero_form").clone().attr("id", "zero_form" + form_index));
        $("#zero_form" + form_index).css("display", "inline");
        $("#zero_form" + form_index + " :input").each(function () {
            $(this).attr("id", $(this).attr("id") + form_index);
        });
        $("#remove"+form_index).click(function () {
            $(this).closest("div").remove();
        });
    });

});

JSfiddle

There is something I'm not understanding about the syntax within my each function? Help please!

Answer 1

• you need to use change handlers to listen to the change event of the select element
• since you have dynamic elements, you need to use event delegation

• to make element access easier, I have made some dom changes also - added some class attributes

  
  Choose a Value NEGATIVE EQUIVOCAL POSITIVE
  

  Add another row

then

$(document).ready(function () {
    // show hidden inputs on POSITIVE selection
    $(document).on('change', '.zero_form select.first_input', function () {
        var sel = $(this).val();
        $(this).parent().find('input.positive').toggle(sel == 'POSITIVE');
    });
    $(document).on('click', '.zero_form .removebutton', function () {
        $(this).closest("div").remove();
    });

    // clone fields  
    var form_index = 0;
    $("#add").click(function () {
        form_index++;
        var $from = $("#zero_form").clone().attr("id", "zero_form" + form_index).insertBefore($(this).parent())
        $from.css("display", "inline");
        $from.find(":input").each(function () {
            $(this).attr("id", $(this).attr("id") + form_index);
        });
    });

});

Demo: Fiddle