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Retrieves the trigger identifier from an HTMX request header.

HTMX 4 uses encodeURI to safely encode multilingual attribute identifiers for HX-Source. We follow that convention but use the name attribute or the data-drupal-selector value when available rather than id.

Values will be a CSS selector constructed from the first available property:

• button[name="first_item"]
• button[data-drupal-selector="first_item"]
• button#id-value
• button

Return value

string The value of the 'HX-Source' header, or an empty string if not set.

See also

core/assets/vendor/htmx/htmx.js:Htmx.#createCoreHeaders

core/misc/htmx/htmx-assets.js:htmx_config_request()

3 calls to HtmxRequestInfoTrait::getHtmxSource()

FormBuilder::prepareForm in core/lib/Drupal/Core/Form/FormBuilder.php

Prepares a structured form array.

HtmxRequestInfoTest::testGetHtmxSource in core/tests/Drupal/Tests/Core/Htmx/HtmxRequestInfoTest.php

Tests the getHtmxTrigger method.

HtmxRequestInfoTrait::getHtmxTriggerName in core/lib/Drupal/Core/Htmx/HtmxRequestInfoTrait.php

Extracts the trigger name from the HX-Source header.

File

core/lib/Drupal/Core/Htmx/HtmxRequestInfoTrait.php, line 106

Class

HtmxRequestInfoTrait

Provides methods for getting information about the HTMX request.

Namespace

Drupal\Core\Htmx

Code

protected function getHtmxSource() : string {
  return rawurldecode($this->getRequest()->headers
    ->get('HX-Source', ''));
}

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