HTML Button Id Attribute - Dofactory

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HTML <button> id Attribute HTML <br> HTML <canvas>

An id on a <button> tag assigns an identifier to the button.

The identifier must be unique across the page.

Example

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An id attribute on a <button>.

Approve <button id="alert-button" onclick="alert('The request has been approved!');">Approve</button> Try it live

Using id

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The id attribute assigns an identifier to the <button> element.

The id allows JavaScript to easily access the <button> element.

It is also used to point to a specific id selector in a style sheet.

Tip: id is a global attribute that can be applied to any HTML element.

Syntax

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<button id="identifier">

Values

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Value Description
identifier A unique alphanumeric string. The id value must begin with a letter ([A-Za-z]) and may be followed by any number of letters, digits ([0-9]), hyphens (-), underscores (_), colons (:), and periods (.).

More Examples

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A <button> with a unique id. Clicking the button will display its content.

Calculate Revenues Show content <button id="mybutton" onclick="alert('Calculations have started!');">Calculate Revenues</button> <br /> <button onclick="show();">Show content</button> <script> let show = () => { let element = document.getElementById("mybutton"); alert("Content = " + element.innerHTML); } </script> Try it live

Code explanation

The id attribute assigns a unique identifier to the button.

Clicking the button calls JavaScript which locates the button using the id.

Finally, the content of the button is displayed in an alert box.

Browser support

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Here is when id support started for each browser:

Chrome 1.0 Sep 2008
Firefox 1.0 Sep 2002
IE/Edge 1.0 Aug 1995
Opera 1.0 Jan 2006
Safari 1.0 Jan 2003

You may also like

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  • Our HTML button Tag Reference
  • Our HTML id Attribute Reference
  • Our CSS Buttons Tutorial

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