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Unique ID for Flexible Content row

  • Hi, I’m using a system based on Flexible Content to build most of my websites, using common patterns to create specific content blocks.

    However, I find myself in need of being able to assign each row a unique, unchanging ID, to be able to target it for specific CSS properties. I had assumed that each row would include a unique ID and I intended to use that as an HTML ID, but when getting the output with get_row() I’ve found that there is no such thing as an ID for each row.

    Is there any other way that I could access a unique ID property for each row?

  • You have to generate your own unique ID.

    I do this with the sites I am working on to have an ID for generation of dynamic CSS and to allow clients the ability to link to portions of the page using #{ID}.

    What I have is a group with a single field called layout_id. This group is cloned into all of my flex layouts.

    I add a filter to this field to make it readonly.

    add_filter('acf/load_field/key=field_5dd6ea9c6325c'.$key, 'readonly_field', 20, 1);
    function readonly_field($field) {
      $field['readonly'] = true;
      return $field;

    Then I have a bit of JS in my custom admin.js file that generates the unique ID values. I do this in the JS to ensure that the id is unique on the page. It is potentially possible for the ID value to change, but this is rare. This cannot be done with prepare field because all of the rows would end up with the same ID.

      if (typeof acf != 'undefined') {
        acf.add_action('ready append', function($el) {
          // array to hold list of existing ID values
          var layout_ids = [];
          // selector targets id field butnot hidden clones of layouts
          var fields = $('[data-key="field_5dd6ea9c6325c"] .acf-input input').not('.clones [data-key="field_5dd6ea9c6325c"] .acf-input input');
          if (fields.length) {
            for (i=0; i<fields.length; i++) {
              var field = $(fields[i]);
              var value = field.val();
              if (value == '' || layout_ids.indexOf(value) != -1) {
                value = 'pnl-'+acf.uniqid();

    If yo wanted to not use the JS method then you’d need to construct an acf/save_post action that did the generation after the fields are saved to ensure that they are unique on the page.

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