react/button-has-type

A <button> without a type is a submit button. Inside a <form>, clicking it submits the form and reloads the page, even if the button was only meant to open a menu.

The rule needs to read the value from the code, so it must be a string or a ternary between two strings. React.createElement("button", ...) is checked too.

Configure#

Off by default. To turn it on:

bunfig.toml

[lint.rules]
"react/button-has-type" = "error" # or "warn"

Every option, set to its default:

bunfig.toml

[lint.rules]
"react/button-has-type" = ["error", {
  button = true,
  submit = true,
  reset = true,
}]

Examples#

Reported:

<form>
  <button onClick={openMenu}>Options</button>
</form>;

const close = <button type="close">Close</button>;
const save = <button type={kind}>Save</button>;

React.createElement("button", { onClick: openMenu }, "Options");

Not reported:

<form>
  <button type="button" onClick={openMenu}>Options</button>
  <button type={isLast ? "submit" : "button"}>Next</button>
</form>;

Options#

Option	Default	What it does
`button`	`true`	Allow `type="button"`.
`submit`	`true`	Allow `type="submit"`.
`reset`	`true`	Allow `type="reset"`.

Set one to false to forbid that type:

<button type="reset">Clear</button>;