Tips for targeting a specific set of elements in codeBehind within Web Forms without creating an additional wrapper element

In my Webform page, I have a html form containing fields for customer data and product data, as well as other miscellaneous fields.

I am facing the challenge of needing to hide either the group of product fields or customer fields during PageLoad or other event handlers based on certain backend logic. In the .NET Framework, hiding them individually by ID requires a significant amount of code and manual updates whenever new fields are added.

Attempting to group them in a wrapper and hide that wrapper causes issues with CSS selectors, even when using display: contents.

Is there a way to create a "Pseudo Group" for these elements in the .NET Framework? This would allow me to reference the group of elements in the code behind using a loop or similar method to hide them, without adding an extra layer in the generated HTML markup. I am not interested in rewriting CSS selectors extensively, as the example below illustrates just a fraction of the existing selectors.

ProductFieldGroup.Visible = false;

.spaced-form>.input-group:not(:first-child) {
  margin-top: 1rem;
}

/*wrapper that breaks some CSS selector*/
.product-fields {
  display:content;
}
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="caa8a5a5beb9beb8babeabaea8a3b8ba87bc96">[email protected]</a>/dist/css/bootstrap.min.css">

<div class="form-group spaced-form">
  <div class="input-group">
    <div class="input-group-prepend">
      <span class="input-group-text">Other Field 1</span>
    </div>
    <input runat="server" id="OtherField1" type="text" class="form-control form-control-lg" />
  </div>
  <div class="input-group">
    <div class="input-group-prepend">
      <span class="input-group-text">Customer Field 1</span>
    </div>
    <input runat="server" id="Customer1" type="text" class="form-control form-control-lg" />
  </div>
  <div class="input-group">
    <div class="input-group-prepend">
      <span class="input-group-text">Customer Field 2</span>
    </div>
    <input runat="server" id="Customer2" type="text" class="form-control form-control-lg" />
  </div>
  <div class="product-fields" id="ProductFieldGroup">
    <div class="input-group">
      <div class="input-group-prepend">
        <span class="input-group-text">Product Field 1</span>
      </div>
      <input runat="server" id="Product1" type="text" class="form-control form-control-lg" />
    </div>
    <div class="input-group">
      <div class="input-group-prepend">
        <span class="input-group-text">Product Field 2</span>
      </div>
      <input runat="server" id="Product2" type="text" class="form-control form-control-lg" />
    </div>
    <div class="input-group">
      <div class="input-group-prepend">
        <span class="input-group-text">Other Field 2</span>
      </div>
      <input runat="server" id="OtherField1" type="text" class="form-control form-control-lg" />
    </div>
  </div>

</div>

Answer №1

If you're searching for a way to hide and show a group of controls/markup in your code, the Panel component is what you need.

The panel's Visible property can be used in code-behind to manipulate the visibility of the control group.

Here is an example declaration for a group of product fields within a panel:

<asp:Panel ID="ProductFieldsPanel" runat="server">
    <div class="input-group">
        <div class="input-group-prepend">
            <span class="input-group-text">Product Field 1</span>
        </div>
        <input runat="server" id="Product1" type="text" class="form-control" />
    </div>
    <div class="input-group">
        <div class="input-group-prepend">
            <span class="input-group-text">Product Field 2</span>
        </div>
        <input runat="server" id="Product2" type="text" class="form-control" />
    </div>
</asp:Panel>

To hide these fields using code-behind, simply set their visibility to false like so:

ProductFieldsPanel.Visible = false;

When the panel is hidden, no corresponding markup will be generated. However, when visible, it will generate the following markup:

<div id="MainContent_ProductFieldsPanel">

UPDATE:

If you don't want any markup generated at all, consider using the PlaceHolder component.

Hope this explanation helps!

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