> For the complete documentation index, see [llms.txt](https://help.form.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.form.io/how/examples.md). # Examples ## Overview This page is a repository of minimal example implementations that have been created. You can import these templates and see how a given feature was implemented in the builder. These get created during support emails. If you need an example created for your situation, please send us an email ### Input must be valid json #### Description Textarea w/ custom validation attached to verify the contents is valid json. {% file src="/files/fMk89592K0sxy4Txeow5" %} ### Set the value of one field using another #### Description When the button is clicked on this form, the value from the source field will be copied to the destination. {% file src="/files/IsrYKd8EBCxrzfI2sNQP" %} ### Validate dates relative to other dates 3 date inputs w/ attached validation: min, max, in between {% file src="/files/0oNgY50YRxdPbYpjxrsh" %} --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://help.form.io/how/examples.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.