Views-only conditional block: Show "Add Content" link or "Already submitted" message based on current user and Node ID

Following up on my previous post where I was struggling to pass the current Request ID to a prepopulated form when a View returns no results—I finally solved it! After days of fighting with missing row tokens and URL aliases, here is the clean, definitive solution.

Why the usual methods failed:

1. No Row Tokens: Since the View is empty (zero results), Drupal doesn't generate any tokens for fields.

2. No Contextual Filters: If your View architecture doesn't use contextual filters, Twig variables like {{ view.args }} remain completely empty.

3. URL Aliases: If your site uses clean URLs (e.g., /requests/my-test-title), a basic browser JavaScript regex looking for /node/ID fails because the actual ID is hidden.

The Solution

Instead of forcing Drupal to look for server-side tokens, we can solve this entirely on the client side (in the user's browser). We can insert a small HTML + Vanilla JavaScript snippet inside a Global: Text area under the No Results Behavior of the View.

Crucial step: Make sure the Text format under the text area is set to Full HTML, otherwise Drupal will strip out the <script> tags.

The script bypasses the visible URL and directly queries Drupal’s global system object window.drupalSettings (or falls back to the <link rel="shortlink"> tag in the page HEAD). It extracts the raw numeric Node ID, cleans it, and injects it straight into the button link.

The Code

Paste this directly into your View's No Results Text Area:

HTML

<div class="blocco-inserimento-bottone" style="margin: 20px 0;">
  <a id="bottone-preventivo-dinamico" href="/node/add/preventivo_tenute_meccaniche?richiesta=" class="button button--primary" style="display: inline-block; padding: 10px 20px; background-color: #007bff; color: #fff; text-decoration: none; border-radius: 4px; font-weight: bold;">
    ADD A QUOTE FOR THIS REQUEST
  </a>
</div>

<script>
  (function() {
    var nid = '';

    // 1. Check Drupal's global path settings (works perfectly with URL Aliases)
    if (window.drupalSettings && window.drupalSettings.path && window.drupalSettings.path.currentPath) {
      var percorso = window.drupalSettings.path.currentPath; // Returns e.g., "node/307"
      var estraiNumeri = percorso.match(/\d+/);
      if (estraiNumeri) {
        nid = estraiNumeri[0]; // Isolates only the digits (e.g., "307")
      }
    }

    // 2. Fallback: check the HTML shortlink in the HEAD if the first method fails
    if (!nid) {
      var tagShortlink = document.querySelector('link[rel="shortlink"]');
      if (tagShortlink) {
        var href = tagShortlink.getAttribute('href');
        var estraiNumeriHref = href.match(/\d+/);
        if (estraiNumeriHref) {
          nid = estraiNumeriHref[0];
        }
      }
    }

    // 3. Inject the clean numeric ID into the button's href attribute
    if (nid) {
      var elementoBottone = document.getElementById('bottone-preventivo-dinamico');
      if (elementoBottone) {
        elementoBottone.href = "/node/add/preventivo_tenute_meccaniche?richiesta=" + nid;
      }
    }
  })();
</script>

Why this is the best approach:

• Zero Server Overhead: It doesn't trigger extra database queries or heavy token modules.

• Alias-Proof: It works seamlessly whether your path is a raw system path (/node/307) or a customized semantic alias (/quotes/industrial-seal-maintenance).

• Clean Data Input: By using match(/\d+/), it strips out any trailing text or duplicates (avoiding buggy strings like node/307,307), ensuring your entity prepopulate module receives a flawless, clean integer.

Hopefully, this saves someone else from the headache I went through!