Dynamic Button Visibility: Hiding and Showing Buttons

Hiding the Buttons in “pageinit”:

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In this part, you are targeting two HTML elements with the IDs ‘b1’ and ‘b2,’ which are buttons you want to control. You use the style.display property to hide them by setting it to ‘none.’

• document.getElementById('b1') and document.getElementById('b2') are used to retrieve references to the HTML elements with the specified IDs.
• uploadButton.style.display = 'none'; and downloadButton.style.display = 'none'; change the CSS style of these elements so that they are not displayed on the page. Setting the display property to ‘none’ makes the elements invisible and takes up no space in the layout.

Making the Buttons Visible in “field change”:

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In the second part of the code, targeting the same HTML elements (‘b1’ and ‘b2’), but this time making them visible by setting the style.display property to ‘block.’

• document.getElementById('b1') and document.getElementById('b2') retrieve references to the same HTML elements that were hidden previously.
• uploadButton.style.display = 'block'; and downloadButton.style.display = 'block'; change the CSS style of these elements to ‘block,’ which is the default display style for most block-level elements. This makes the buttons visible on the page again.

The purpose of this code is to control the visibility of buttons on a web page, initially hiding them during the “pageinit” event and making them visible again when a “field change” event occurs. This can be useful for dynamically showing or hiding UI elements based on user interactions or other conditions in a web application.