# Update form field dynamically through PHP (gform\_pre\_submission) **URL:** \ **Category:** Get Help\ **Tags:** rgpost, custom, gform\_pre\_submission\ **Created:** [May 26, 2020, 7:19pm UTC](https://community.gravityforms.com/t/update-form-field-dynamically-through-php-gform-pre-submission/4911 "2020-05-26T19:19:58Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![frankmaven](https://avatars.discourse-cdn.com/v4/letter/f/d9b06d/32.png) [@frankmaven](https://community.gravityforms.com/u/frankmaven)\ **Post date:** [May 26, 2020, 7:19pm UTC](https://community.gravityforms.com/t/update-form-field-dynamically-through-php-gform-pre-submission/4911/1 "2020-05-26T19:19:58Z")
I was looking at [https://docs.gravityforms.com/gform\_pre\_submission/](https://docs.gravityforms.com/gform_pre_submission/) as a way to update a field value based on a previous field’s value. Here’s the situation: I have a field named ‘territory’ which has 4 options (display=value): 1. USA = 1 2. Canada = 2 3. Mexico = 3 4. Other International = 4 Then, later on the form I have a field named ‘country’, which I can hide for 1-3 and I show if 4 is chosen in territory. I want to be able to automatically fill in the country based on what is selected in territory. Here’s my code snippet: ``` add_action( 'gform_pre_submission_2', 'pre_submission_handler' ); function pre_submission_handler( $form ) { if(rgpost( 'input_1' ) == "1"){ $_POST['input_14'] = "United States"; } if(rgpost( 'input_1' ) == "2"){ $_POST['input_14'] = "Canada"; } if(rgpost( 'input_1' ) == "3"){ $_POST['input_14'] = "Mexico"; } } ``` Also tried the if statement checking if the value is the numerical version as well (… == 1){. Country isn’t getting set with this code. Appreciate the help! ---
**Author:** ![chrishajer](https://sea2.discourse-cdn.com/flex020/user_avatar/community.gravityforms.com/chrishajer/32/88_2.png) [@chrishajer](https://community.gravityforms.com/u/chrishajer)\ **Post date:** [May 26, 2020, 10:24pm UTC](https://community.gravityforms.com/t/update-form-field-dynamically-through-php-gform-pre-submission/4911/2 "2020-05-26T22:24:36Z")
That seems like it should work. Is your form ID actually form 2? I recommend modifying your code to add a couple logging lines. Try this: ```auto add_action( 'gform_pre_submission_2', 'pre_submission_handler' ); function pre_submission_handler( $form ) { GFCommon::log_debug( __METHOD__. '(): The initial POST => ' . print_r( $_POST, true ) ); if(rgpost( 'input_1' ) == "1"){ GFCommon::log_debug( __METHOD__. '(): Matched United States.' ); $_POST['input_14'] = "United States"; } if(rgpost( 'input_1' ) == "2"){ GFCommon::log_debug( __METHOD__. '(): Matched Canada.' ); $_POST['input_14'] = "Canada"; } if(rgpost( 'input_1' ) == "3"){ GFCommon::log_debug( __METHOD__. '(): Matched Mexico.' ); $_POST['input_14'] = "Mexico"; } GFCommon::log_debug( __METHOD__. '(): The modified POST => ' . print_r( $_POST, true ) ); } ``` ---
**Author:** ![chrishajer](https://sea2.discourse-cdn.com/flex020/user_avatar/community.gravityforms.com/chrishajer/32/88_2.png) [@chrishajer](https://community.gravityforms.com/u/chrishajer)\ **Post date:** [May 26, 2020, 10:26pm UTC](https://community.gravityforms.com/t/update-form-field-dynamically-through-php-gform-pre-submission/4911/3 "2020-05-26T22:26:30Z")
Sorry, forgot this part. For that to be useful, you will need to first enable logging: > **[Logging and Debugging - Gravity Forms Documentation](https://docs.gravityforms.com/logging-and-debugging/)** > > For quite a while, enabling logging within Gravity Forms has been a go-to method for debugging any issues within Gravity Forms. As of Gravity Forms version 2.2, logging functionality has been moved from a separate add-on to becoming a core feature of... With the modified code, and with logging enabled, please test the form. Then go back to the Forms \> Settings \> Logging page, and view the Gravity Forms Core log. Share the link to the log file if you need help figuring out what is going on. ---
**Author:** ![frankmaven](https://avatars.discourse-cdn.com/v4/letter/f/d9b06d/32.png) [@frankmaven](https://community.gravityforms.com/u/frankmaven)\ **Post date:** [May 28, 2020, 9:57pm UTC](https://community.gravityforms.com/t/update-form-field-dynamically-through-php-gform-pre-submission/4911/4 "2020-05-28T21:57:41Z")
Hey Chris, This helped and I can see that my field is getting switched out, but I probably should have been clearer about the true goal. My issue is actually that I need these values to be updated for a webhook that I’m trying to process. Based on the log timestamps it looks as though the input\_14 is updated to United States before the webhook happens, but even though I’ve mapped that field (country) in the pre\_submission it’s not getting handed off to the webhooks. From the GForm log (note the timestamps): 2020-05-28 21:47:34.169352 - DEBUG --\> pre\_submission\_handler(): Matched United States. 2020-05-28 21:47:34.169373 - DEBUG --\> pre\_submission\_handler(): The modified POST =\> Array ( [input\_1] =\> 1 [input\_2] =\> [caleb@email.com](mailto:caleb@email.com) [input\_4] =\> CA [input\_5] =\> FM [input\_6] =\> (123) 456-7890 [input\_7\_1] =\> 123 [input\_7\_2] =\> 23 [input\_7\_3] =\> SGF [input\_7\_4] =\> [input\_7\_6] =\> United States [input\_10\_1] =\> Missouri [input\_10\_2] =\> Greene [is\_submit\_2] =\> 1 [gform\_submit] =\> 2 [gform\_unique\_id] =\> [state\_2] =\> WyJbXSIsIjI0YjVkNTRmYWYwNzZjMDQ5NzI4YmU1YzRhNmI4NTU0Il0= [gform\_target\_page\_number\_2] =\> 0 [gform\_source\_page\_number\_2] =\> 1 [gform\_field\_values] =\> [input\_14] =\> United States ) From the webhooks log: `2020-05-28 21:47:35.609162 - DEBUG --> GF_Webhooks::process_feed(): Sending webhook request to [url-ommitted]?territory=1&country&emailAddress=caleb%40email.com&name=CA&company=FM&phone=%28123%29+456-7890&streetAddress1=123&streetAddress2=23&city=SGF&state=Missouri&county=Greene&ipAddress=75.98.104.178; Array` Any thoughts on how to get that to the webhook before it’s sent? There are a few fields that aren’t required, but I’d to send them as blank as well, so a similar function will solve that for me as well. Thanks! ---
**Author:** ![richardw8k](https://sea2.discourse-cdn.com/flex020/user_avatar/community.gravityforms.com/richardw8k/32/2354_2.png) [@richardw8k](https://community.gravityforms.com/u/richardw8k)\ **Post date:** [January 4, 2022, 6:04pm UTC](https://community.gravityforms.com/t/update-form-field-dynamically-through-php-gform-pre-submission/4911/5 "2022-01-04T18:04:38Z")