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How to display some text (not a node) in a modal window using ajax?

Following Ajax Dialog Boxes, I wrote the following code:

      public function buildForm(array $form, FormStateInterface $form_state) {      $form['message'] = [       '#type' => 'textarea',       '#prefix' => t('Message') .' <a class="use-ajax" data-dialog-options="{&quot;width&quot;:400}" data-dialog-type="modal" href="/node/27" id="modal-dialog"><img src="/sites/default/files/images/info.svg"></a>',       '#required' => TRUE,     ];      $form['actions'] = [       '#type' => 'actions',     ];     $form['actions']['submit'] = [       '#type' => 'submit',       '#value' => $this->t('Send'),     ];      return $form;   }

When I click on the image ‘info.svg’ in the ‘Message’ field of the form, the content of the node 27 is displayed in a modal dialog box, as expected.

I would like now to "only" display some text and not the content of a node.
By what should I replace the href in my link?

This article was republished from its original source.
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How to display some text (not a node) in a modal window using ajax?

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