An HTML hidden input, also known as a hidden field, is an HTML tag developers use during a web form submission to include data that isn’t intended to be modifiable or viewable by the end user who submits the form. To add a hidden input, include it in your code as an input tag: <input type=”hidden”>.

<input type="hidden"> <input> elements of type "hidden" let web developers include data that cannot be seen or modified by users when a form is submitted. For example, the ID of the content that is currently being ordered or edited, or a unique security token.

We create an HTML Document that contains an <input> Tag. Use the type attribute with the <input> tag. Set the type attribute to value “ hidden “. Syntax: <input type="hidden">

Use the following code fragment to hide the form on button click. document.getElementById ("your form id").style.display="none"; And the following code to display it: document.getElementById ("your form id").style.display="block"; Or you can use the same function for both purposes: