What is the difference between appendChild and innerHTML?
Differences between innerHTML and appendChild() innerHTML is supposed to by assigned a HTML string, whereas appendChild() accepts only Node objects. In contrast, appendChild() does not accept HTML and needs extra code for generating the Node objects.
Is it bad to use innerHTML?
‘innerHTML’ Presents a Security Risk The use of innerHTML creates a potential security risk for your website. Malicious users can use cross-site scripting (XSS) to add malicious client-side scripts that steal private user information stored in session cookies. You can read the MDN documentation on innerHTML .
What is difference between getElementById and getElementsByClassName?
getElementById returns a single DOM element whose ID matches your query. getElementsByClassName returns an HtmlCollection – an array-like structure containing the DOM elements that matched your query. You have to iterate through each element in the array to apply your style.
What is innerText and innerHTML?
innerText returns all text contained by an element and all its child elements. innerHtml returns all text, including html tags, that is contained by an element.
What is appendChild?
The appendChild() method appends a node as the last child of a node. You can also use this method to move an element from one element to another (See “More Examples”). Tip: Use the insertBefore() method to insert a new child node before a specified, existing, child node.
Can I use getElementsByClassName?
The getElementsByClassName method of Document interface returns an array-like object of all child elements which have all of the given class name(s). You may also call getElementsByClassName() on any element; it will return only elements which are descendants of the specified root element with the given class name(s).
Which one is faster getElementById or getElementsByClassName and why?
Yes, getElementById() and getElementsByClassName() are faster.
What happens when you call getElementsByClassName on an element?
You may also call getElementsByClassName () on any element; it will return only elements which are descendants of the specified root element with the given class name (s). Warning: This is a live HTMLCollection. Changes in the DOM will reflect in the array as the changes occur.
Which is better to use createelement or innerHTML?
While clean, using innerHTML reparses and recreates all DOM nodes inside the div element and is less efficient than simply appending a new element to the div. In the above cases, createElement is the more performant choice, even if it requires more typing. However, innerHTML does have an advantage when we want to do multiple things to an element.
What does innerHTML + = do in JavaScript?
Using innerHTML += takes the existing DOM content of the parent node, serialises it to HTML in a string, adds some more HTML to the end of the string, erases the existing elements in the parent node, generates DOM elements from that string, then appends the new nodes to the parent node.
Which is more efficient createelement or appendChild?
As we can see, in simple one-time cases, createElement/appendChild is more efficient, but in cases where many changes are made, innerHTML is the more efficient choice.