With Drupal 8, I have a form with two selects, both filled. I want to add a button/link after each of these two selects, looking like this.


The buttons, however, don't have a fixed link because the link target depends on what is selected in the select. Also, the link needs to open a new tab.

For example, if in the select "car1" the key "12345" is selected, the link should open /cars/12345; if "car2" is selected with the key "67890" then "/cars/67890"

This is the code I am using.

$form['select_g1'] = array(
                    '#type' => 'select',
                    '#prefix' => '<div class="container-inline">',
                    '#title' => t('Select &emsp; &emsp; &emsp;&emsp;'),
                    '#options' => $contarray,
                    '#empty_value' => '',
                    '#default_value' => ($ext) ? $row['model'] : "",
$form['button'] = array(
                    '#markup' => ' <a target="_blank" href=""><span class="button js-form-submit form-submit"><img src="/sites/default/buttons/edit.png"></span></a></div>',              

Can someone help me there?


1 Answer 1


This is easy to do with javascript.

You can do an onchange event for your select that updates the link,

or you can do a mousedown event on your link that grabs the value from the select.

A quick google search shows many possibilities:



To add javascript to your form, you need to add the js to your custom module, say in mymodule/js/updatelink.js

then add a mymodule.libraries.yml file in your module

  version: VERSION
    js/updatelink.js: {}
    - core/jquery
    - core/drupal

then attach it to your form like this:

$form['#attached']['library'][] = 'mymodule/mymodule.updatelink';

You'll want to wrap your code in a Drupal.behaviors class. See https://www.drupal.org/docs/8/api/javascript-api/javascript-api-overview

  • Thank you very much! So far it works with including the js and (for testing) displaying a alert when the select changes.
    – Michael
    Dec 12, 2016 at 14:55

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