Help with JavaScript math.round etc

Hi guys im doing a course which includes some JavaScript and I need help with the following question please,

Edit M150_TMA05_2008J_Q1_task01.html replacing the existing
JavaScript with the function,
getRoundedRandomNumber(aNumber). This function should
return whole numbers between 0 and aNumber, using
Math.round() as outlined above.
Write a comment to document what this function does, using an
extended comment (that is, one between /* and */). Also
provide appropriate single-line comments (the ones starting
with //) in the code, describing how it works. Paste a copy of
the getRoundedRandomNumber() function into your Solution
Document.
Also remove the line of code and associated comment you wrote
for part (ii).
2
Read the ONCLICK event handler for the file’s HTML form to
understand how getRoundedRandomNumber() is invoked and
how the returned number is displayed.

The code I have so far is below but I don't think its right please help as I need to complete this part to move onto the next.

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 <HTML>

<HEAD>

<TITLE>M150 TMA 5 : Programming : Task 1 - Testing Math.random()</TITLE>
 
<SCRIPT language = "JavaScript">
 
        //generate a random number greater than or equal to 0.0 and less than 50.0 

        //rounded to a whole number

        //and display it in an alert dialogue
 
var getRoundedRandomNumber = Math.round(Math.random()*49);
 
window.alert("Random number returned is: " + getRoundedRandomNumber);
 
//generate a random number and round down
 
var getRandomNumber = Math.floor(Math.random()*49)
 
</SCRIPT>

</HEAD>

<BODY>

<STRONG>A test of the random number functions <BR></STRONG>

    <FORM NAME = "randomForm">
 
    <INPUT TYPE = "button" NAME = "randomButton"  VALUE ="Display Random Number!"

            ONCLICK = "window.alert(getRandomNumber);">

    </FORM>

</BODY>

</HTML>

May 6 '09 #1

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5285

Dormilich

8,651

Expert Mod 8TB

the first thing you need is a function (see description) where you need to put in the code, so you can call it onclick.

further, your form needs an action attribute. and the script a type attribute.

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 <form action="name_of_page" … >
 
<script type="text/javascript>

May 7 '09 #2

DaiOz

Hi, any chance of an example of what function code you would use, I'm pretty useless but trying to learn lol

May 7 '09 #3

Dormilich

8,651

Expert Mod 8TB

the task requires you to write

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 function getRoundedRandomNumber(aNumber)

{

  // put your code here
 
  return roundedNumber;

}

and then write some code to call this function onclick.

hint: the basic idea is outlined in the task

May 7 '09 #4

DaiOz

My attempt was as follows;

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 Function getroundedrandomnumber(aNumber)

{

var aNumber = Math.floor(Math.random()*49);
 
return aNumber;

}

Help please lol

May 7 '09 #5

acoder

16,027

Expert Mod 8TB

JavaScript is case-sensitive, so make sure the case is absolutely correct and also look at the error console.

May 7 '09 #6

DaiOz

I'm typing on my iPhone in work and using notepad to right the script lol

May 7 '09 #7

acoder

16,027

Expert Mod 8TB

But you must be testing it in a browser, no?

May 7 '09 #8

DaiOz

Ah i see what you mean it says 'aNumber' is undefined

May 7 '09 #9

DaiOz

Thanks for the help guys I don't know how but I made it work the error console tip was great will post code when I get home, cheers again

May 7 '09 #10

Help with JavaScript math.round etc

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