Javascript
Revision as of 15:58, 6 September 2024 by Eric Rasmusen (talk | contribs) (→An Example of a Web Page that asks the user for input and then produces some output)
An Example of a Web Page that asks the user for input and then produces some output, and has different styles for different divisions of the output webpage
<h1>Printing "Happy Birthday, NAME INPUT" 8 Times</h1>
<div id="output"></div> <!-- This is where we will display the output we create below -->
<script> //Javascript has to go in a special script section.
// Prompt the user for his name
let name = prompt("What is your name?") ;
//We will this variable later.
let how_many=8;
function new_line(){
// Select the output div
let outputDiv = document.getElementById('output');
// Print Happy Birthday 8 times
for (let i = 1; i <= how_many; i++) {
outputDiv.innerHTML += "Happy Birthday, "+ name +"!<br>" ;
} //The curly bracket shows this is the end of the loop;
//Add some blank lines
outputDiv.innerHTML += " <br><br><br><br><br>" ;
} //The curcly bracket shows this is teh end of the function.
//Run the function and print happy birthday 8 times.
new_line();
// Prompt the user for a number of additional times to repeat happy birthday." how_many" is already declared, so no "let" is needed or allowed;
how_many = prompt("How many times would you like to see that?") ;
//Run the function again, after a .4 second delay.
let timer = setTimeout(new_line, 400);
</script>
Code which times when user input is received, and uses fade-in of text
<!DOCTYPE html>
What Javascript can't do
- Javascript can't get rid of the "This page says" heading of windows it opens. This is a security anti-phishing feature, so people will know the question is coming from the Web, not from their apps.
- Javascript can't put italics, boldface, color, etc. into prompt windows.
