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101

EXTENDING DREAMWEAVER CS4

The Dreamweaver Document Object Model

Properties and methods of HTML

The following table lists the properties and methods of HTML elements in Dreamweaver, along with their return

values or explanations. A bullet (•) marks read-only properties.

Property or method Return value

nodeType • Node.ELEMENT_NODE

parentNode • The parent tag. If this is the HTML tag, the document object returns.

childNodes • A NodeList that contains all the immediate children of the tag.

previousSibling • The sibling node immediately prior to this one. For example, in an HTML

document the

previousSibling for the body element is the head

element.

nextSibling • The sibling node immediately following this one. For example, in an HTML

document the

nextSibling for the head element is the body element.

(Any

script, style, or meta tags in the head would be child nodes of the

head element.)

tagName • The HTML tagName for the element, such as IMG, A, or DIV. The value

returned is always in uppercase letters.

attrName A string that contains the value of the specified tag attribute.The

tag.attrName cannot be used if the attrName attribute is a reserved word

in the JavaScript language (for example,

class). In this case, use

getAttribute() and setAttribute().

innerHTML The source code that is contained between the opening tag and the closing

tag. For example, in the code

Hello, World!,

p.innerHTML returns Hello, World!. If you write to this

property, the DOM tree immediately updates to reflect the new structure of

the document. (This property is defined in the Microsoft Internet Explorer 4.0

DOM, but is not part of DOM Level 1 or 2.)

outerHTML The source code for this tag, including the tag. For the previous example

code,

p.outerHTML returns Hello, World!. If you

write to this property, the DOM tree immediately updates to reflect the new

structure of the document. (This property is defined in the Microsoft Internet

Explorer 4.0 DOM, but is not part of DOM Level 1 or 2.)

getAttribute(attrName)

The value of the specified attribute if it is explicitly specified; null otherwise.

getTranslatedAttribute(attrName)

The translated value of the specified attribute or the same value that

getAttribute() returns if the attribute’s value is not translated. (This

property is not included in DOM Level 1; it was added to Dreamweaver 3 to

support attribute translation.)

setAttribute(attrName, attrValue)

Does not return a value. Sets the specified attribute to the specified value

example,

img.setAttribute("src", "image/roses.gif").

removeAttribute(attrName)

Does not return a value. Removes the specified attribute and its value from

the HTML for this tag.

getElementsByTagName(tagName)

A NodeList that can be used to step through child tags of type tagName (for

example,

IMG, DIV, and so on).

If the tagName argument is “layer”, the function returns all LAYER and

ILAYER tags and all absolutely positioned elements.

If the tagName argument is “input”, the function returns all form elements. (If

a name attribute is specified for one or more

tagName objects, it must begin

with a letter, which the HTML 4.01 specification requires, or the length of the

array that this function returns is incorrect.)

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