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Exercise 4: User interaction

You will need to interact with the browser a bit to prompt the user to give input and to write the result to the screen. Here are some examples to get you started.

var input = prompt('Enter something here'); // Displays a pop-up textbox in the browser
document.write(input); // Writes to the document/page
  • Create a scripts folder and create a new file named exercise4.js.
  • In exercise4.html, add a script tag in the <body>. A script tag example: <script src="path/to/.js/file"></script>

Find the highest number

  • Inside exercise4.js, create a function named findHighestNum which takes no parameters.
  • This function will continuously prompt the user for a number and remember the highest number found until the user enters zero.

Tips:

  • Probably need to convert the input string to a number of some kind
  • "continuously prompt" probably means some kind of endless loop...
  • When zero (0) is entered, the loop should exit and it should print the highest number to the screen.

Count letters in text

This algorithm will hold a paragraph of generated text and prompt the user to enter a letter in a pop-up messagebox. It will then find how many occurrences there are of this letter in the text paragraph and output the result.

  • Inside exercise4.js, create a function named countLetters which takes no parameters.
  • Go to http://www.lipsum.com/feed/html and copy a paragraph of dummy text from the page. It doesn't matter which one. (Lipsum is just a fake language made to be just placeholder text in various cases. Awesome for prototyping software).
  • Inside the function, create a variable to hold the lipsum text.
  • Prompt the user for input, which should be a single letter. This value, if valid, should be given as parameter to the function you create next:
  • Inside the function, create a new, nested function named countLetter which takes one parameter named letter.
  • Inside countLetter, find the number of occurrences of the letter given as parameter. Tip: using var characters = text.split(''); will give you the chars in a string which you can then iterate over and check for matches.
  • Print the number of occurrences to the screen.

Go to bonus task =>