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gform_pre_render errors when simply trying to get form ID

  1. keeneyemedia

    This should be simple... I'm trying to grab the form ID on the current page using gform_pre_render and then based on the form ID within the function gform_pre_render is calling do some work... (I don't always know which form is going to be loaded on the page) - so here's the simple version of the code:

    $i_this_form_id = add_filter("gform_pre_render", "update_the_fields");
    echo $i_this_form_id;
    function update_the_fields ($form){
    	return $form["id"];

    The thing is - no matter what I do or don't do with the gform_pre_render - it just puts a whole bunch of " Invalid argument supplied for foreach()" errors on my form. BUT the echo in there returns the correct form ID.
    Is there a better way to make the determination of which form loaded on a page by ID so I can then run the correct gform_field_value_* operation on the form? This seems to work but there's all those errors where the form goes - why?

    Posted 7 years ago on Monday December 17, 2012 | Permalink
  2. I've never seen the WordPress function "add_filter" used like that.

    The gform_pre_render filter is designed to set the value of a field, not return a variable. Can you explain how different forms may be loaded on the page but you do not know the form ID? Maybe that will help me come up with a solution with you.

    Posted 7 years ago on Tuesday December 18, 2012 | Permalink
  3. keeneyemedia

    This code (and a bunch more) lives in an include across a series of multiple pages. Based on the page that loads there's a different form. Since this is include code - I need to know WHICH form is on that page and then do certain things based on the form ID.
    And here's the thing... line 2 above WORKS - the displayed value is the form ID.
    The PRESENCE of the add_filter (setting a variable or not) causes the errors

    add_filter("gform_pre_render", "update_the_fields");

    results in many:
    Warning: Invalid argument supplied for foreach() in /home/thisguy/public_html/wp-content/plugins/gravityforms/form_display.php on line X or Y or Z

    Ultimately what I need to do is invoke a series of add_filter("gform_field_value_FIELDX", "populate_FIELDX"); for the unique fields on each unique form.

    Posted 7 years ago on Tuesday December 18, 2012 | Permalink
  4. keeneyemedia

    I decided to not try and return the form ID as it appears you can't set a variable (global declaration does not work) outside an add_filter call in WP (not a G form thing).

    So - instead inside the "gform_pre_render" I'm getting the form ID and then via a case/switch I'm calling various "gform_field_value_FIELDid" and doing what I need to do - then the form renders with all the fields the way I want them...

    Work fine.


    Posted 7 years ago on Tuesday December 18, 2012 | Permalink