browser as our demo environment, let’s see a couple of functions to interact with the user: alert, prompt… In this case – until they press “OK”.
prompt.The function prompt accepts two arguments:… The visitor can type something in the prompt input field and press OK.… The call to prompt returns the text from the input field or null if the input was canceled.… but if we don’t supply it, Internet Explorer will insert the text "undefined" into the prompt
For instance, here we use the prompt function for two defaults:… Please note: the prompt… In the code below prompt asks for width, but not for title:
Interaction.We’re using a browser as a working environment, so basic UI functions will be:
prompt(question… More in: Interaction: alert, prompt
But for 3, the result of the prompt is a string "3", which is not strictly equal === to the
let result = 1;
for (let i = 0; i < n; i++) {
result *= x;
}
return result;
}
let x = prompt… , "");
let n = prompt("n?"
The functions alert/confirm/prompt
For example, in the code below we loop over i and j, prompting for the coordinates (i, j) from (0,0)
, including Chrome and Firefox the internal timer continues “ticking” while showing alert/confirm/prompt
We’ve already seen examples of built-in functions, like alert(message), prompt(message, default) and
You can check by running the code with entering 35 into prompt
We can handle things more gracefully in db.onversionchange, prompt the visitor to save the data before