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DOM note (1): HTMLDocument interface, domhtmldocument

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DOM note (1): HTMLDocument interface, domhtmldocument

The first step in operations on HTML documents is to obtain reference to document elements. Each element is a node in the DOM, and all elements constitute a node tree in the DOM.

The parameter used to obtain the Element Definition is defined in the htmldocumentinterface. The parameter Doc ument method is used to implement the interface. The commonly used methods and attributes are defined as follows:

 

Attribute or Method Return Value Type Description
[Getter] Any Type Obtains all element Nodes Based on the element name attribute.
All HTMLAllCollection A set composed of all elements in the document, which is not recommended
Body HTMLElement Obtain the <body> element node
Head HTMLHeadElement Obtain the
Images HTMLCollection Obtain all element nodes
Embeds HTMLCollection Obtain all <embed> element nodes
Plugins HTMLCollection Equivalent to embeds attributes
Links HTMLCollection Obtain all <a> and <area> element nodes with href attributes.
Forms HTMLCollection Obtain all <form> element nodes
Scripts HTMLCollection Obtain all <script> element nodes
GetElementsByName () NodeList Obtains all element Nodes Based on the element name attribute.
GetElementsByClassName () NodeList Obtains all element nodes based on the class attribute of the element.

In addition, the HTMLDocument interface inherits the Document Interface of Core DOM. The inherited attributes and methods are as follows:

Attribute or Method Return Value Type Description
DocumentElement Element Get the root element of xml or html. in html, that is,
GetElementById () Element Obtains the specified Element Based on the ID attribute value.
GetElementsByTagName () NodeList Retrieve all element nodes by element name
GetElementsByTagNameNS () NodeList Obtains all element Nodes Based on the specified namespace element name.
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