Dynamic form field population with ajax in yii2 DynamicFormWidget

I have created a dynamic form in my yii2 app using yii2-dynamicform extension. In this form DynamicFormWidget is used to add form fields. Now I want to populate some fields with ajax on selecting one filed in this dynamic form. For a single item I can do it. I don't know to do it for added fields. Here is the form look like when generated.

    <div class="panel-body">
    <div class="form-group field-orderitems-0-product_code">
    <label class="control-label" for="orderitems-0-product_code">Product Code</label>
    <select id="orderitems-0-product_code" class="form-control" name="OrderItems[0][product_code]">
    <option value="">Select</option>
    <option value="#">Product</option>
    </select>
    <div class="help-block"></div>
    </div>

    <div class="row">
    <div class="form-group field-orderitems-0-tax_rate">
    <label class="control-label" for="orderitems-0-tax_rate">Tax Rate</label>
    <input id="orderitems-0-tax_rate" class="form-control" type="text" name="OrderItems[0][tax_rate]">
    <div class="help-block"></div>
    </div>
    </div>
    </div>

Here is my jquery code:

$("#orderitems-0-product_code").change(function(){
        var id = #;
        $.get('get-tax-rate',{ id : id }, function(data){
            var data = $.parseJSON(data)
            $('#orderitems-0-tax_rate').attr('value', data.default_taxrate);
        });
    });

It works fine with my code for single product. What to do when adding multiple items. Form field ids will increase by 1 when dynamically generated.