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Auto-Populate Custom Fields in Forms and Surveys

Enhance your forms and surveys in Stack by auto-populating custom fields using custom HTML and JavaScript. This guide will walk you through retrieving the custom field ID and implementing the necessary code to capture and save data during submission.

Retrieve the Custom Field ID​

To begin, you'll need to identify the ID of the custom field you wish to auto-populate. Follow these steps:

  1. Preview the Form: Navigate to the form you want to modify and open its preview.
  2. Inspect the Page: Right-click anywhere on the page and select Inspect from the context menu.
  3. Select the Custom Field: Use the mouse pointer tool within the Inspect window to click on the desired custom field.
  4. Copy the ID: Locate and copy the ID from the name and ID properties of the selected custom field.

Example: If your custom field is named xxTrustedFormCertUrl, use the steps above to find and copy its ID.

Implementing Custom HTML/JavaScript​

Once you have the custom field ID, you can use it in your custom HTML/JavaScript code to auto-populate the field. Here's a basic example of how to set this up:

// Replace 'customFieldId' with your actual custom field ID
// Replace 'myData' with the data you want to populate
document.getElementsByName('customFieldId')[0].value = myData;
document.getElementsByName('customFieldId')[0].dispatchEvent(new Event("input"));

Important Note​

  • The variable myData is a placeholder. You'll need to replace it with the actual data source or variable that contains the information you wish to populate into the custom field.

By following these steps, you can efficiently auto-populate and capture data in your Stack forms and surveys, streamlining data entry and enhancing user experience.