HTML DOM and Nodes Quiz

10 Questions

What does the DOM provide a standardized way to interact with?

HTML elements

Which method is used to write a string on the document?

write('string')

What does document.form1.name.value access?

The value of an input text

Which method returns all elements with a given class name?

getElementsByClassName()

What can JavaScript do to HTML elements and attributes according to the text?

Change all HTML elements

Which method returns all elements with a given tag name?

getElementsByTagName()

What is the role of the 'document' object in the HTML DOM?

Root element representing the HTML document

Which method returns the element with a specific ID?

getElementById()

What can JavaScript add to an HTML page according to the text?

Additional HTML elements and attributes

What property does 'value' represent when accessing an input text?

Value of the input text

Study Notes

HTML DOM Basics

An HTML comment is a comment node, and any text outside of an element is a text node.
The Document Object Model (DOM) is essential in web development for dynamic web pages, interactivity, content updates, and cross-browser compatibility.

Importance of DOM

The DOM allows JavaScript to access and manipulate page content, structure, and style dynamically, enabling interactive and responsive web experiences.
It enables updating content without reloading the entire page and responding to user actions instantly.

DOM Structure

The DOM is created as a tree of objects called nodes, with a hierarchy corresponding to the structure of each web document.
The DOM consists of several types of nodes, including 'Element', 'Text', and 'Document' nodes.
Every HTML tag is an object in the DOM, with nested tags called “children” of the enclosing one.

Node Types

An 'Element' node represents an element within a page.
A 'Text' node represents all text within elements on a page.
The 'Document' node represents the entire document and is the root node of the DOM hierarchy.

Element Attributes

Element attributes are DOM nodes themselves.

JavaScript and DOM

JavaScript can access all elements in a webpage using the Document Object Model (DOM).
JavaScript can change all HTML elements, attributes, and CSS styles in a page, remove and add new elements, and react to and create new events.

Document Object Methods

The write("string") method writes the given string on the document.
The getElementById() method returns the element having the given id value.
The getElementsByName() method returns all elements having the given name value.
The getElementsByTagName() method returns all elements having the given tag name.
The getElementsByClassName() method returns all elements having the given class name.

Accessing Field Value

The document.form1.name.value syntax is used to access field values, where document is the root element, form1 is the name of the form, name is the attribute name of the input text, and value is the property that returns the value of the input text.