Help with JavaScript math.round etc

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  • DaiOz
    New Member
    • May 2009
    • 16
    #1

    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_2008 J_Q1_task01.htm l replacing the existing
    JavaScript with the function,
    getRoundedRando mNumber(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 getRoundedRando mNumber() 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 getRoundedRando mNumber() 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.

    Code:
    <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>
    Last edited by Dormilich; May 7 '09, 04:15 AM. Reason: added [code] tags
    Tags: None
    • Dormilich
      Recognized Expert Expert
      • Aug 2008
      • 8694
      #2
      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.
      Code:
      <form action="[I]name_of_page[/I]" … >

<script type="text/javascript>

        Comment

        • DaiOz
          New Member
          • May 2009
          • 16
          #3
          Hi, any chance of an example of what function code you would use, I'm pretty useless but trying to learn lol

            Comment

            • Dormilich
              Recognized Expert Expert
              • Aug 2008
              • 8694
              #4
              the task requires you to write
              Code:
              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

                Comment

                • DaiOz
                  New Member
                  • May 2009
                  • 16
                  #5
                  My attempt was as follows;

                  Code:
                  Function getroundedrandomnumber(aNumber)
{
var aNumber = Math.floor(Math.random()*49);

return aNumber;
}
                  Help please lol
                  Last edited by Dormilich; May 8 '09, 05:45 AM. Reason: added [code] tags

                    Comment

                    • acoder
                      Recognized Expert MVP
                      • Nov 2006
                      • 16032
                      #6
                      JavaScript is case-sensitive, so make sure the case is absolutely correct and also look at the error console.

                        Comment

                        • DaiOz
                          New Member
                          • May 2009
                          • 16
                          #7
                          I'm typing on my iPhone in work and using notepad to right the script lol

                            Comment

                            • acoder
                              Recognized Expert MVP
                              • Nov 2006
                              • 16032
                              #8
                              But you must be testing it in a browser, no?

                                Comment

                                • DaiOz
                                  New Member
                                  • May 2009
                                  • 16
                                  #9
                                  Ah i see what you mean it says 'aNumber' is undefined

                                    Comment

                                    • DaiOz
                                      New Member
                                      • May 2009
                                      • 16
                                      #10
                                      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

                                        Comment

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