Initial commit

Author: mmirus

CHANGELOG.md

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+# Changelog
+
+## 1.0 / 2018-10-25
+
+- Initial release

README.md

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+# Gravity Forms JavScript Dynamic Population
+
+Some caching systems ignore query parameters, preventing Gravity Forms from dynamically populating field values.
+
+This plugin bypasses that problem by filling Gravity Forms fields that have dynamic population enabled on the client side using JavaScript.

gravity-forms-javascript-dynamic-population.php

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+
+<?php
+/*
+Plugin Name: Gravity Forms JavaScript Dynamic Population
+Plugin URI: https://github.com/mmirus/gravity-forms-javascript-dynamic-population
+Author: Matt Mirus
+Author URI: https://github.com/mmirus
+Version: 1.0
+GitHub Plugin URI: https://github.com/mmirus/gravity-forms-javascript-dynamic-population
+ */
+
+// add data-prefill attribute to fields
+add_filter('gform_field_content', function ($field_content, $field, $value, $entry_id, $form_id) {
+    if (!$field->allowsPrepopulate) return $field_content;
+    return str_replace('name=', "data-prefill='{$field->inputName}' name=", $field_content);
+}, 10, 5);
+
+// fill values from query params for fields where dynamic population is enabled
+add_action('gform_register_init_scripts', function ($form) {
+    $script = "
+    const getUrlParameter = function(name) {
+        name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
+        var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
+        var results = regex.exec(location.search);
+        return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' '));
+    };
+    const fields = [].slice.call(document.querySelectorAll('[data-prefill]'));
+    fields.forEach(function(field) {
+        const value = getUrlParameter(field.dataset.prefill);
+        if (value === '') return;
+
+        const fieldType = (field.tagName === 'INPUT') ? field.type : field.tagName.toLowerCase();
+        switch (fieldType) {
+            case 'checkbox':
+            case 'radio':
+                field.checked = (value.split(',').indexOf(field.value) !== -1);
+                break;
+            case 'select':
+                jQuery(field).val(value.split(','));
+                break;
+            default:
+                field.value = value;
+        }
+    });
+    ";
+
+    GFFormDisplay::add_init_script($form['id'], 'populate_fields', GFFormDisplay::ON_PAGE_RENDER, $script);
+}, 10, 2);