Prompt, Alert, Confirm
Javascript's Input/Output functions.
Prompt
Javascript provides a simple way to collect input from the user - the prompt()
function:
The prompt
command has two arguments. prompt(text, [defaultText])
and returns a string
of what the user entered. It is important to note, that it returns a string.
If the user clicks cancel, then the prompt()
function returns null
.
Alert
The console
is a great way to give output as a developer (testing, errors, warnings) but general users do not see the console window! If you want to give a quick pop-up of information to the user (without any input from the user), you can use the alert()
function.
The alert()
function is very simple. It takes a string and returns nothing. To use it, you just call it with whatever you want shown in the pop-up box.
Confirm
Maybe you don't want text from the user but rather a YES or NO (or perhaps OK
or CANCEL
). Javascript provides the confirm()
function to ask the user a question and present them with two choices that equate to true
or false
.
The ability to retrieve a boolean value from the user can be very useful. The confirm()
function takes a string as input and returns a boolean.
While many examples could be provided of the three methods listed, it is much more rewarding if you try them out yourself.
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