Podcast
Questions and Answers
When a browser parses HTML, what does it generate from the HTML?
When a browser parses HTML, what does it generate from the HTML?
- DOM objects (correct)
- CSS stylesheets
- JavaScript functions
- Server-side code
Standard HTML attributes automatically become properties of DOM objects when the browser loads the page.
Standard HTML attributes automatically become properties of DOM objects when the browser loads the page.
True (A)
If <body> tag has the attribute id="page", what DOM property will be created?
If <body> tag has the attribute id="page", what DOM property will be created?
- `body.page = "id"`
- `body.class = "page"`
- `body.id = "page"` (correct)
- `body.attribute = "id"`
DOM nodes are regular __________ objects.
DOM nodes are regular __________ objects.
Which of the following is true regarding DOM properties?
Which of the following is true regarding DOM properties?
A standard attribute for one element is always standard for all elements.
A standard attribute for one element is always standard for all elements.
If an attribute is non-standard, there ______ be a DOM-property for it.
If an attribute is non-standard, there ______ be a DOM-property for it.
Which method is used to check for the existence of an attribute on an element?
Which method is used to check for the existence of an attribute on an element?
Which of the following statements about HTML attributes is correct?
Which of the following statements about HTML attributes is correct?
What will typeof elem.setAttribute('Test', 123) return in JavaScript?
What will typeof elem.setAttribute('Test', 123) return in JavaScript?
How can you access all attributes of an element, including both standard and non-standard ones?
How can you access all attributes of an element, including both standard and non-standard ones?
Match the method to its function:
Match the method to its function:
Consider an element <div data-custom="test"></div>. Which of the following will correctly retrieve the string value test? (Select all that apply)
Consider an element <div data-custom="test"></div>. Which of the following will correctly retrieve the string value test? (Select all that apply)
Modifying a DOM property always updates the corresponding HTML attribute.
Modifying a DOM property always updates the corresponding HTML attribute.
Given: <input id='myInput' value='initial'>. Later, we do: document.getElementById('myInput').value = 'updated'. The attribute document.getElementById('myInput').getAttribute('value') will return ______.
Given: <input id='myInput' value='initial'>. Later, we do: document.getElementById('myInput').value = 'updated'. The attribute document.getElementById('myInput').getAttribute('value') will return ______.
Flashcards
DOM Object Generation
DOM Object Generation
When a browser loads a page, it parses the HTML and creates DOM objects.
Attribute-Property Mapping
Attribute-Property Mapping
Most standard HTML attributes of element nodes automatically become properties of DOM objects.
Modifying DOM Nodes
Modifying DOM Nodes
DOM nodes are regular JavaScript objects that can be altered.
Accessing HTML Attributes
Accessing HTML Attributes
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elem.attributes
elem.attributes
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HTML Attribute Features
HTML Attribute Features
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Standard vs. Non-Standard Attributes
Standard vs. Non-Standard Attributes
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Study Notes
- When a browser loads a page, it parses the HTML and generates DOM objects.
- Standard HTML attributes of element nodes become properties of DOM objects.
DOM Properties
- DOM nodes are JavaScript objects that can be altered.
- New properties can be created, and methods can be added to DOM objects.
- Built-in prototypes like
Element.prototypecan be modified to add new methods to all elements. - DOM properties and methods behave like regular JavaScript object properties and methods.
- They can have any value and are case-sensitive.
HTML Attributes
- When the browser parses HTML to create DOM objects, it recognizes standard attributes and creates DOM properties from them.
- If an attribute is non-standard, a DOM property is not created for it.
- Standard attributes for one element may be unknown for another.
- All attributes are accessible using the following methods:
elem.hasAttribute(name): checks for existence.elem.getAttribute(name): gets the value.elem.setAttribute(name, value): sets the value.elem.removeAttribute(name): removes the attribute.
- These methods operate directly with what's written in HTML.
- All attributes can be read using
elem.attributes, a collection of objects of the built-inAttrclass, withnameandvalueproperties. - HTML attributes have these features:
- Names are case-insensitive.
- Values are always strings.
- All attributes, including those set dynamically, are visible in
outerHTML. - The
attributescollection is iterable and includes all element attributes (standard and non-standard) as objects withnameandvalueproperties.
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