Can two tags have same ID?
Can two tags have same ID?
The HTML id attribute is used to specify a unique id for an HTML element. You cannot have more than one element with the same id in an HTML document.
Can I get multiple elements by ID Javascript?
As per the W3c spec, id attributes “must be unique within a document”. That’s the whole point of a unique identifier, and is why you don’t have DOM methods to get multiple elements with the same ID (since the latter doesn’t make any sense).
What is the difference between getElementsByName and getElementsByTagName?
getElementsByName fetch all the elements with given name and returns list of elements. getElementsByTagName fetch all the elements with given Tag and returns list of elements.
How do I select multiple elements by ID?
Use the querySelectorAll() method to select elements by multiple ids, e.g. document. querySelectorAll(‘#box1, #box2, #box3’) . The method takes a string containing one or more selectors as a parameter and returns a collection of the matching elements.
What happens if multiple elements have same ID?
If you have multiple elements with the same ID, you’ll only run into problems when using JavaScript to access those elements. For example, if you were to do document. getElementById(‘duplicateId’) , you would only get back one element instead of two. Other than that, the browser will render the page just fine.
Can multiple elements have same class?
The HTML class attribute is used to specify a class for an HTML element. Multiple HTML elements can share the same class.
How do you select multiple elements in JavaScript?
To select multiple elements on a HTML page you need the document. querySelectorAll()! Put your selector in and you will get all the elements.
Should I use querySelector or getElementById?
You should opt to use the querySelector method if you need to select elements using more complex rules that are easily represented using a CSS selector. If you want to select an element by its ID, using getElementById is a good choice.
What does getElementsByTagName return if not found?
Return value If no elements are found, the HTMLCollection is empty.
How do you get all elements with same tag name?
The getElementsByTagName() method returns a collection of all elements with a specified tag name. The getElementsByTagName() method returns an HTMLCollection.
How do I get all elements ID?
Use the document. querySelectorAll() method to get all elements whose id starts with a specific string, e.g. document. querySelectorAll(‘[id^=”box”]’) . The method returns a NodeList containing all the elements that match the provided selector.
How do you select multiple elements in Javascript?
