Gravity Forms: Example of conditionally requiring a field based on the value of another field.

gravity-forms-conditionally-require-fields.php

<?php
/**
 * Gravity Forms: Example of conditionally requiring a field based on the value of another field.
 */
add_filter( 'gform_pre_render', 'gw_conditional_requirement' );
add_filter( 'gform_pre_validation', 'gw_conditional_requirement' );
function gw_conditional_requirement( $form ) {

    $value = rgpost( 'input_2' );
    if( $value == 'no' )
        return $form;

    foreach( $form['fields'] as &$field ) {

        if( $field['id'] == 1 ) {
            $field['isRequired'] = true;
        }

    }

    return $form;
}

Hi, thanks for the advice, but I have one question, is that possible to get checkbox status, if is checked or not ? I have a big problem with that

In case anyone's wondering about this, this snippet is at https://docs.gravityforms.com/gform_pre_validation/ so you could ask Gravity Forms' support about "their own" snippet if you have follow-up questions.