Hey there, Just wanted to say Hi. - I'm new on here & have drifted here as I'm having a minor problem I was hoping someone could assist ...?
(for some reason I couldn't post this directly into the Javascript forum, don't seem to have a 'New Thread' button)
Am working on a 'lottery drawing program' for an assignment, so far have coded the below, but for some reason, on the output page, it keeps putting [object HTMLInputElemen t] into the output Text box.. - any ideas?
Many thanks in advance, - AB. -
<HTML>
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<HEAD>
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<TITLE>Programming : Task - Drawing numbered balls</TITLE>
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<SCRIPT language="JavaScript">
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// My getRandomNumber function
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function getRandomNumber (myNum)
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{
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var getRandomNumber = Math.floor(Math.random() * myNum);
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// this returns the number into the alert box.
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return getRandomNumber;
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}
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function lotteryDraw(highBall, numberToDraw)
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{
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// This sets up an array called 'numberPool' which will hold your numbers to draw from
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// the arrays size is set to the same as the user's input 'highBall'
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var numberPool = new Array(highBall);
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// This is user entered, it sets a variable called sizeOfPool to = the user inputted 'highball'
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var sizeOfPool = highBall;
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// once the user enters the amount of numbers they wish to draw it sets up an array to hold them once they have been drawn.
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var drawnNumbers = new Array(numberToDraw);
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/* This is a 'FOR' loop, a loop which iterates a predetermined number of times.
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That number is the same as the initially entered 'highBall' The loop goes through the spaces in the array numberPool placing
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incremented numbers into it's spaces ( 1, 2, 3, 4, etc...) it continues this until it reaches the number that = highBall
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(as the array numberPool is equal to highBall, this means that every space in the array has a number assigned to it.
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*/
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for (var index = 0; index < highBall; index = index + 1)
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{
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numberPool[index] = index + 1;
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}
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/* This is a FOR loop which iterates a predetremined number of times.
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The number of iterations is governed by the number that the user enters as the number of balls they wish to draw (numberToDraw)
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it randomises a number then goes through our array of numbers taking the selected number and placing it into another array ready to display.
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It also then removes that number from our main list of numbers to make sure that the same number isn't drawn twice'
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*/
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for (var drawnBall = 0; drawnBall < numberToDraw; drawnBall = drawnBall + 1)
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{
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// This line creates our random number between 0 & our highest possible number (sizeOfPool)
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var randomNumber = getRandomNumber(sizeOfPool);
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// This line adds our chosden number into the initially blank array 'Drawn Numbers'
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// as this loop runs through, the array will slowly fill up, until all the numbers have been selected
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drawnNumbers[drawnBall] = numberPool[randomNumber];
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// This takes our very highest number in our 'numberPool' and copies it over the number that was just selected
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// the reason for this is so that in a minute , when the number of possible selections is shrunk by 1, the only number that is 'dropped out' is
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// The number that was just selected and added to the array 'DrawnNumbers'
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numberPool[randomNumber] = numberPool[sizeOfPool - 1];
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// this stops the selection process from selecting the highest number each time
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// as the highest number each time is written over the number just selected
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// it ensures a full list of numbers that are all uniqwue and are no duplicates of the ones already selected.
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sizeOfPool = sizeOfPool - 1;
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}
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// This writes out the contents of the array 'drawnNumbers' into the space on the HTML form.
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document.lotteryForm.drawnNumbersTextBox.value = drawnNumbers;
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}
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</SCRIPT>
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</HEAD>
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<BODY>
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<STRONG>A test of the function lotteryDraw()<BR></STRONG>
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<FORM NAME = "lotteryForm">
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<P>
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Total Number of Balls in Pool:
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</P>
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<P>
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<INPUT TYPE = "text" NAME = "numberOfBallsTextBox" SIZE ="2" MAXLENGTH = "2">
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</P>
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<P>
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Number of Balls to Draw:
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</P>
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<P>
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<!-- Note the SIZE attribute, whose value determines the size in characters of a text box and
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the MAXLENGTH attribute, whose value constrains the length in characters of the allowed input -->
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<INPUT TYPE = "text" NAME = "ballsToDrawTextBox" SIZE = "1" MAXLENGTH = "1" >
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</P>
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<!-- The RESET input type creates a button which, when clicked, resets a form to its original state -->
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<INPUT TYPE = "reset" NAME = "resetButton" VALUE = "Clear Form">
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<!-- COMPLETE THE ONCLICK EVENT HANDLER TO INVOKE lotteryDraw() WITH ARGUMENTS TAKEN FROM THE FORM INPUT TEXT BOXES -->
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<INPUT TYPE = "button" NAME = "drawBalls" VALUE ="Draw the Balls!"
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ONCLICK = "highBall = document.lotteryForm.numberOfBallsTextBox;
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numberToDraw = document.lotteryForm.ballsToDrawTextBox;
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lotteryDraw(highBall, numberToDraw);">
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<P>
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Drawn Numbers:
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</P>
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<P>
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<INPUT TYPE = "text" NAME = "drawnNumbersTextBox" SIZE = "30" MAXLENGTH = "30" >
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</P>
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</FORM>
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</BODY>
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</HTML>
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5  13718  Dormilich 8,658
Recognized Expert Moderator Expert
your main problems are the input values of lotteryDraw(), these should be integers/strings but they are actually the input elements. therefore the for loop is completely skipped and the output contains the element(s) present in the array.
tip: with the Firebug addon (Firefox) you can go step by step through your code and see, what the values are.
Hmm, - OK, I think I get what you mean, I'll have a crack at solving it & let you know how I get on,..
thanks for the guidance.
Thank you very much to Dormilich for helping me out.
I'm still learning JS & hadn't used many object outputs etc.
I have now got it working so am very grateful. (on to the next one <sigh>)
Dormilich 8,658
Recognized Expert Moderator Expert
glad you got it sorted.
PS: wait ’til you discover, that everything in Javascript is an object…
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