[英]Difference between this.form and document.forms
Is there a difference between this.form
and document.forms (document["forms"])
or, are they similar? this.form
和document.forms (document["forms"])
之间是否有区别,或者它们是否相似?
Here is the code I wrote to test the difference. 这是我为测试差异而编写的代码。
<form name="myForm" id="myForm">
<input type="text" name="haha" id="myForm" value="laughable" onclick="alert(this.form.haha.value)" />
</form>
alert(document.forms.myForm.haha.value);
They both result in the same thing. 他们都导致了同样的事情。
this.form
will give you the form of the form element. this.form
将为您提供表单元素的形式。 ( this
is the form element) (
this
是表单元素)
The containing form element, if this element is in a form.
包含表单元素,如果此元素是一个表单。
document.forms
will give you all the forms in the document (if it's supported!) document.forms
将为您提供document.forms
所有表单(如果它受支持!)
forms returns a collection (an HTMLCollection ) of the form elements within the current document.
forms返回当前文档中表单元素的集合(HTMLCollection)。
Better use document.getElementById(id)
更好地使用
document.getElementById(id)
var form = document.getElementById(formId);
this.form
will return the form property of this, as noted above whatever "this"
is. this.form
将返回this.form
的form属性,如上所述,无论"this"
是什么。
"this"
could be anything, eg. "this"
可以是任何东西,例如。 a div, so possibly doesn't have a form property. 一个div,所以可能没有表单属性。
If "this"
happens to refer to document, then this.form
will return exactly the same thing as document.form
. 如果
"this"
碰巧引用了document,那么this.form
将返回与document.form
完全相同的东西。 But otherwise, don't count on it. 但除此之外,不要指望它。
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