Q
How do you bind an event handler to an element so it is called once and then removed?

Answer & Solution

Answer: Option C
Solution:
The addEventListener method accepts an options object with a once property to call the handler once.
Related Questions on Average

Which event is triggered when the user resizes the browser window?

A). resize

B). resizestart

C). resizeend

D). resizewindow

How can you get the element that triggered the event?

A). event.target

B). event.srcElement

C). event.element

D). event.currentElement

Which event is triggered when a user presses a key?

A). keypress

B). keyup

C). keydown

D). keyhit

What event occurs when an element loses focus?

A). blur

B). focus

C). focusout

D). unfocus

What is the correct syntax to prevent the default event action?

A). event.preventDefault()

B). event.stopPropagation()

C). event.prevent()

D). event.stopDefault()

How do you add an event listener to an element in JavaScript?

A). element.addEventListener('click', handler)

B). element.attachEvent('click', handler)

C). element.on('click', handler)

D). element.listen('click', handler)

Which event is fired when the mouse pointer is moved onto an element?

A). mouseenter

B). mouseleave

C). mouseover

D). mousemove

How can you attach an event handler for a specific element when it is clicked?

A). element.onclick = function() {}

B). element.addEventListener('click', function() {})

C). element.attachEvent('onclick', function() {})

D). element.listen('click', function() {})

Which event is triggered when a user clicks on an HTML element?

A). click

B). mouseclick

C). mousedown

D). mouseup

What is the purpose of the 'change' event?

A). It is triggered when an element's value changes

B). It is triggered when an element is clicked

C). It is triggered when the mouse moves over an element

D). It is triggered when the DOM is changed