Salesforce Exam Javascript-Developer-I Topic 8 Question 3 Discussion

Actual exam question for Salesforce's Salesforce Certified JavaScript Developer I exam

Question #: 3
Topic #: 8

A developer is creating a simple webpage with a button. When a user clicks this button

for the first time, a message is displayed.

The developer wrote the JavaScript code below, but something is missing. The

message gets displayed every time a user clicks the button, instead of just the first time.

01 function listen(event) {

02 alert ( 'Hey! I am John Doe') ;

03 button.addEventListener ('click', listen);

Which two code lines make this code work as required?

Choose 2 answers

AOn line 02, use event.first to test if it is the first execution.

BOn line 04, use event.stopPropagation ( ),

COn line 04, use button.removeEventListener(' click'' , listen);

DOn line 06, add an option called once to button.addEventListener().

Show Suggested Answer

Suggested Answer: C, D

by Lilli at May 03, 2022, 07:19 AM

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