[英]Which tags are counted in form.elements?
What tag is counted in form.elements
? form.elements
计入了什么标签?
<html>
<head>
<title>
form process
</title>
<script>
function showelements()
{
var form = document.getElementById("f");
var n = form.elements.length;
alert(n);
}
</script>
</head>
<body>
<form id="f" action="#" method="post">
<p>Hello</p>
<input type="text" />
<input type="text" />
<button onclick="showelements()">Click</button>
</form>
</body>
</html>
I think n = 4
because there are 4 elements: p
, input
, input
, button
, but the result n = 3
. 我认为
n = 4
是因为有4个元素: p
, input
, input
, button
,但是结果n = 3
。
The elements collection contains only form controls (input, select, button, textarea and fieldset). elements集合仅包含表单控件 (输入,选择,按钮,文本区域和字段集)。
If you want all the elements in the form, use frm.getElementsByTagName("*")
. 如果要使用表单中的所有元素,请使用
frm.getElementsByTagName("*")
。
Ok this time from W3C: http://www.w3.org/TR/html5/forms.html#dom-form-elements 好的,这次是从W3C来的: http : //www.w3.org/TR/html5/forms.html#dom-form-elements
The
elements
IDL attribute must return anHTMLFormControlsCollection
[...]elements
IDL属性必须返回HTMLFormControlsCollection
[...]
Here is a more comprehensive list : 这是一个更全面的列表 :
button
fieldset
input
keygen
object
output
select
textarea
"why <input type="image" src="" />
is not counted?" “为什么不计算
<input type="image" src="" />
?
Because, historical reasons... 因为历史原因...
[...] with the exception of
input
elements whosetype
attribute is in the Image Button state, which must, for historical reasons, be excluded from this particular collection [HTMLFormControlsCollection].除了其
type
属性处于“ 图像按钮”状态的input
元素外,出于历史原因,这些元素必须从此特定集合[HTMLFormControlsCollection]中排除。
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