Document.forms

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

forms 屬性會回傳一個包含目前頁面中所有 <form> 元素的集合物件（型別為 HTMLCollection）。

語法

collection = document.forms;

範例：取得表單資訊

html

<!doctype html>
<html lang="en">
  <head>
    <title>document.forms example</title>
  </head>

  <body>
    <form id="robby">
      <input
        type="button"
        onclick="alert(document.forms[0].id);"
        value="robby's form" />
    </form>

    <form id="dave">
      <input
        type="button"
        onclick="alert(document.forms[1].id);"
        value="dave's form" />
    </form>

    <form id="paul">
      <input
        type="button"
        onclick="alert(document.forms[2].id);"
        value="paul's form" />
    </form>
  </body>
</html>

範例 2：取得表單內的元素

var selectForm = document.forms[index];
var selectFormElement = document.forms[index].elements[index];

規範

Specification
HTML Standard # dom-document-forms-dev

參見

HTMLFormElement