JavaScript: JS in WebBrowser and basic DOM manipulations
Client-side JavaScript code is embedded within HTML documents in four ways:
Inline, between a pair of and tags
From an external file specified by the src attribute of a tag
In an HTML event handler attribute, such as onclick or onmouseover
In a URL that uses the special javascript: protocol.
The Document Object Model, or DOM, is the fundamental API for representing and manipulating the content of HTML and XML documents. The API is not particularly complicated, but there are a number of architectural details you need to understand. First, you should understand that the nested elements of an HTML or XML document are represented in the DOM as a tree of objects. The tree representation of an HTML document contains nodes representing HTML tags or elements, such as and
, and nodes representing strings of text. An HTML document may also contain nodes representing HTML comments. Consider the following simple HTML document:
The DOM representation of this document:
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