button-has-type.md

Disallow 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

Examples of incorrect code for this rule:

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

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

Examples of correct code for this rule:

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 = <button type={condition ? "button" : "submit"}>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')
var Hello = React.createElement('button', {type: condition ? 'button' : 'submit'}, '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).

Examples of incorrect code for this rule, when configured with { "reset": false }:

var Hello = <button type="reset">Hello</button>
var Hello = <button type={condition ? "button" : "reset"}>Hello</button>

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

When Not To Use It

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