eslint-plugin-react/docs/rules/button-has-type.md

Prevent usage of button elements without an explicit type attribute (react/button-has-type)

The default value of type attribute for button HTML element is "submit" which is often not the desired behavior and may lead to unexpected page reloads. This rules enforces an explicit type attribute for all the button elements and checks that its value is valid per spec (i.e., is one of "button", "submit", and "reset").

Rule Details

The following patterns are considered errors:

var Hello = <button>Hello</button>
var Hello = <button type="foo">Hello</button>

var Hello = React.createElement('button', {}, 'Hello')
var Hello = React.createElement('button', {type: 'foo'}, 'Hello')

The following patterns are not considered errors:

var Hello = <span>Hello</span>
var Hello = <span type="foo">Hello</span>
var Hello = <button type="button">Hello</button>
var Hello = <button type="submit">Hello</button>
var Hello = <button type="reset">Hello</button>

var Hello = React.createElement('span', {}, 'Hello')
var Hello = React.createElement('span', {type: 'foo'}, 'Hello')
var Hello = React.createElement('button', {type: 'button'}, 'Hello')
var Hello = React.createElement('button', {type: 'submit'}, 'Hello')
var Hello = React.createElement('button', {type: 'reset'}, 'Hello')

Rule Options

...
"react/button-has-type": [<enabled>, {
  "button": <boolean>,
  "submit": <boolean>,
  "reset": <boolean>
}]
...

You can forbid particular type attribute values by passing false as corresponding option (by default all of them are true).

The following patterns are considered errors when using "react/button-has-type": ["error", {reset: false}]:

var Hello = <button type="reset">Hello</button>

var Hello = React.createElement('button', {type: 'reset'}, 'Hello')

When Not To Use It

If you use only "submit" buttons, you can disable this rule