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JavaScript - Can The Math.random() Command Actually Return A 0 Or 1?

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Can The Math.random() Command Actually Return A 0 Or 1?	View Content

I'm a newby that just finished an online javascript course. When I do a search on Math.random() I receive sites that all describe the command as returning a number 'between 0 and 1'.
My question is - are the expected numbers limited to -
0.0000000000000001 thru 0.9999999999999999
or is it possible to get the 0 and 1 also.
Seems like the definition should be 'from 0 thru 1' rather than 'between 0 and 1'.

JoeF

Full Excel VBA Course - Beginner to Expert

How To Prevent Repeating In A Random (math.random) Array?

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I've looked for a solution to this issue, but it seems like a little different scenario than other situations.

I made a system for generating friend requests on Facebook. I have a grid that is 6 x 3, for a total of 18 cells. Each cell has a picture in it, and the picture is linked to the Facebook friend request page. My problem is that since each cell is populated at random from the array, I'm getting lots of repeats. For example, some picutures are in 5 cells, and some are in none. I'm trying to figure out how to make it so that once a picture is used once in the grid, it does not get used again in the same grid. I still want every cell filled at random on each page load, I just want to prevent the repeating.

Here's my current code:
Code:

<script type="text/javascript">
var vip_list=new Array(
	new Array('http://profile.ak.fbcdn.net/v225/1616/88/s1220771654_2158.jpg','http://www.facebook.com/addfriend.php?id=1220771654'),
	new Array('http://profile.ak.fbcdn.net/v223/1233/29/s904885342_9055.jpg','http://www.facebook.com/addfriend.php?id=904885342'),
	new Array('http://profile.ak.fbcdn.net/v229/1574/66/s1752031238_626.jpg','http://www.facebook.com/addfriend.php?id=1752031238'),
        new Array('http://profile.ak.fbcdn.net/v223/768/71/n661155042_7325.jpg','http://www.facebook.com/addfriend.php?id=661155042'),
	new Array('http://profile.ak.fbcdn.net/v226/732/26/n1827289885_2478.jpg','http://www.facebook.com/addfriend.php?id=1827289885'),
     new Array('http://profile.ak.fbcdn.net/v229/1631/70/s1425313768_1140.jpg','http://www.facebook.com/addfriend.php?id=1425313768'),
     new Array('http://static.ak.fbcdn.net/pics/s_silhouette.jpg','http://www.facebook.com/addfriend.php?id=1667023416'),
     new Array('http://profile.ak.fbcdn.net/v225/1146/29/s506485704_9532.jpg','http://www.facebook.com/addfriend.php?id=506485704'),
     new Array('http://profile.ak.fbcdn.net/profile6/270/32/s692160490_8745.jpg','http://www.facebook.com/addfriend.php?id=692160490'),
     new Array('http://profile.ak.fbcdn.net/v229/114/83/s1218176198_7375.jpg','http://www.facebook.com/addfriend.php?id=1218176198'),
     new Array('http://profile.ak.fbcdn.net/v226/946/4/s1470171885_4973.jpg','http://www.facebook.com/addfriend.php?id=1470171885'),
     new Array('http://static.ak.fbcdn.net/pics/s_silhouette.jpg','http://www.facebook.com/addfriend.php?id=1329505888'),
     new Array('http://static.ak.fbcdn.net/pics/s_silhouette.jpg','http://www.facebook.com/addfriend.php?id=1325496968'),
     new Array('http://profile.ak.fbcdn.net/v223/1546/92/s1536913202_2017.jpg','http://www.facebook.com/addfriend.php?id=1536913202'),
     new Array('http://static.ak.fbcdn.net/pics/s_silhouette.jpg','http://www.facebook.com/addfriend.php?id=1624715433'),
     new Array('http://profile.ak.fbcdn.net/v228/1282/58/s713998257_3682.jpg','http://www.facebook.com/addfriend.php?id=713998257')
);

var chosen_vip=Math.floor(vip_list.length*Math.random());
var chosen_vip1=Math.floor(vip_list.length*Math.random());
var chosen_vip2=Math.floor(vip_list.length*Math.random());
var chosen_vip3=Math.floor(vip_list.length*Math.random());
var chosen_vip4=Math.floor(vip_list.length*Math.random());
var chosen_vip5=Math.floor(vip_list.length*Math.random());
var chosen_vip6=Math.floor(vip_list.length*Math.random());
var chosen_vip7=Math.floor(vip_list.length*Math.random());
var chosen_vip8=Math.floor(vip_list.length*Math.random());
var chosen_vip9=Math.floor(vip_list.length*Math.random());
var chosen_vip10=Math.floor(vip_list.length*Math.random());
var chosen_vip11=Math.floor(vip_list.length*Math.random());
var chosen_vip12=Math.floor(vip_list.length*Math.random());
var chosen_vip13=Math.floor(vip_list.length*Math.random());
var chosen_vip14=Math.floor(vip_list.length*Math.random());
var chosen_vip15=Math.floor(vip_list.length*Math.random());
var chosen_vip16=Math.floor(vip_list.length*Math.random());
var chosen_vip17=Math.floor(vip_list.length*Math.random());

document.write('<center>');
document.write('<a href="',vip_list[chosen_vip][1],'" target="_blank"><img src="',vip_list[chosen_vip][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip1][1],'" target="_blank"><img src="',vip_list[chosen_vip1][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip2][1],'" target="_blank"><img src="',vip_list[chosen_vip2][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip3][1],'" target="_blank"><img src="',vip_list[chosen_vip3][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip4][1],'" target="_blank"><img src="',vip_list[chosen_vip4][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip5][1],'" target="_blank"><img src="',vip_list[chosen_vip5][0],'" height="60" width="60"></a>');
document.write('<br>');
document.write('<a href="',vip_list[chosen_vip6][1],'" target="_blank"><img src="',vip_list[chosen_vip6][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip7][1],'" target="_blank"><img src="',vip_list[chosen_vip7][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip8][1],'" target="_blank"><img src="',vip_list[chosen_vip8][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip9][1],'" target="_blank"><img src="',vip_list[chosen_vip9][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip10][1],'" target="_blank"><img src="',vip_list[chosen_vip10][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip11][1],'" target="_blank"><img src="',vip_list[chosen_vip11][0],'" height="60" width="60"></a>');
document.write('<br>');
document.write('<a href="',vip_list[chosen_vip12][1],'" target="_blank"><img src="',vip_list[chosen_vip12][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip13][1],'" target="_blank"><img src="',vip_list[chosen_vip13][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip14][1],'" target="_blank"><img src="',vip_list[chosen_vip14][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip15][1],'" target="_blank"><img src="',vip_list[chosen_vip15][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip16][1],'" target="_blank"><img src="',vip_list[chosen_vip16][0],'" height="60" width="60"></a>');
document.write('<a href="',vip_list[chosen_vip17][1],'" target="_blank"><img src="',vip_list[chosen_vip17][0],'" height="60" width="60"></a>');
document.write('<br>');

</script>

Any suggestions?
Thank you!

Math.random Help

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hey. im working on a facebook app..
this is what i got so far.
PHP Code:
<script language="JavaScript">

</script>

<script language="JavaScript">

</script>

now i want that the app posts the random image automaticlly to the useres timeline.. for example: if the random image is theImages [3] then it should post the image theimage [3] to the users timeline.. i see alot of facebook apps doing this.. thanks in advance

Math.random And Fillrect With Html5 Canvas

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Hello, I'm new here so.. hi! You'll probably be seeing me a lot. Anyways here's my questions.

I am trying to get a function to draw 5 randomly sized and colored rectangles nested within each other. Meaning each rectangle should not go outside the boundaries of the rectangle it is in. The color thing I've got down in a randomColor() function. It's the nesting rectangles inside rectangles that is confusing me (hense me being up for the past 4 hours trying to understand it) I started out with very simple code just making 5 rectangles of reducing sizes nested in each other, then added the Math.random to randomize all the sizes. Now I'm at this point and have lost my way. Please help, or maybe there is just an easier way. I added a bunch of comments in my code so maybe you'll understand what I'm trying to do.

Code:

function rect() { // rectangle generator
	        autoctx.clearRect(0, 0, 400, 400); // clear canvas
            // declare variables
            var x;
            var y;
            var width;
            var height;
            var i = 0; // counter

            // create random x,y coordinates
            x = Math.round(Math.random() * 100);
            y = Math.round(Math.random() * 100);

            do { // create random size rectangle
                width = Math.round(Math.random() * 400);
                height = Math.round(Math.random() * 400);
            } while (width < 100 || height < 100); // make sure rectangle is big enough

		    autoctx.fillStyle = randomColor(); // Runs random color generator
		    autoctx.fillRect(x, y, width, height); // fill first rectangle

		    do {
		        x += (Math.round(Math.random() * 15)); // choose new random coordinates within previous rectangle
		        y += (Math.round(Math.random() * 15)); // choose new random coordinates within previous rectangle

		        //*********** KEEPS RECTANGLE HEIGHT AND WIDTHS FROM BEING A NEGATIVE NUMBER ***********//

		        do { //*** WIDTH TESTER ***// validates width to be within previous rectangles width
		            var testW = 0; // new width tester variable
		            testW = width - (Math.round(Math.random() * (2 * x))); // store test width
		            if (testW > 0) {
		                width = testW; // if test width > 0 store in width
                    }
		        } while (testW < 0); // if test width < 0 continue loop

		        do { //*** HEIGHT TESTER ***// validates height to be within previous rectangles height
		            var testH = 0; // create height testing variable
		            testH = height - (Math.round(Math.random() * (2 * y))); // calculate new test height
		            if (testH > 0) { // if test height is > 0 
		                height = testH; // store as height
		            }
		        } while (testH < 0); // if test height < 0 try again

                //*** Fills final rectangle values ***//
		        autoctx.fillStyle = randomColor(); // Runs random color generator
		        autoctx.fillRect(x, y, width, height);

		        i++; // add 1 to counter
		    } while (i < 4); // kick out of loop after the 5th rectangle
		}

thanks guys I hope I'm not too confusing or anything, any help would be greatly appreciated!

Return Random Hash Table Entry

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Having trouble figuring out how to do this...I can get the particular entry by name but I can't randomly select one from the several because it's a string and not a number....
Code:

var newOre = 0;

var ore = {
"iron" : 5,
"silver" : 3,
"gold" : 2,
"platinum" : 1
}

var userOre = {
"iron" : 0,
"silver" : 0,
"gold" : 0,
"platinum" : 0
}

Code:

function getAnotherOre () {
newOre = ore[Math.floor(Math.random() * ore.length)];
userOre += newOre;
}

The random() is for an array, tried to use it here and returns 0 every time because the key in the key:value pair is a "string", though if I'm reading it right, it is trying to get a random number based off the length of the table, so why doesn't it do that?

Ideally I want it to increment a corresponding hash table of users Ores...so if you randomly get a iron, it adds 5 to the users "iron" entry.

I had a for loop, but I only need to randomly generate 1 entry result each time called so do I need to loop through things or can I just randomly get a key:value pair back and append that to the userOre table???????

AM I APPROACHING THIS WRONG FOR WHAT I WANT TO DO?

Any ideas or link to documentation? I'm searching.....

I can get the individual value of a field manually: console.log("keyName"); which will output the right number, but how do I get a random("keyName") and once I figure that out I probably would append("correspondingName", value) to the other table...

Basically, functionally I just want to randomly get one of several values when the function is called. I guess I could make global variables for each type of ore, then just manually increment a random one some other way...

This is for a html5 game where when you collide with a "mine" it triggers the function but I want it to randomly give various types of ore instead...Maybe I'm going about it wrong...

Maybe it's easier just to declare 10 different global variables (assuming 10 ore types) and randomly give a number 0-10 of each every time the function is called......?

Logic Of Break, Return False, Return True

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I don't understand the logic of Break, Return False, Return True. It was never really covered in our college class, and I see everyone using it. I got an A in the class, if that 'proves' that I really tried to apply myself.

NOTE: I understand what the function is doing. I just don't understand WHEN to use break, return false or return true if the the translator can determine the conditional statements.

PHP Code:
function submitForm(){
var ageSelected = false;

for (var i=0; i<5; ++1){
if (document.forms[0].ageGroup[i].checked == true) {
ageSelected = true;
break;
}
}

if (ageSelected == false){
window.alert("You must select your age group");
return false;
}

else
return false;
}

if the the translator can determine the conditional statements, why not write it like this:

PHP Code:
function submitForm(){
var ageSelected = false;

for (var i=0; i<5; ++1){
if (document.forms[0].ageGroup[i].checked == true) {
ageSelected = true;
break; // what's the point for the 'break'? Won't the rest of the code be ignored since it passed the first condition?
}
}

if (ageSelected == false){
window.alert("You must select your age group");
return false;
}
// why not leave the last else out? is it just a 'safety' catch, in case something other than true or false is inputted?
else
return false; // what's the point?
}

Questions:
Why use return true, if the translator knows it's ture? Why use "return false" if the translator knows it's false and the alert window has already gone up? why not use "break" to stop the code? Why use the "return false" at the end "else" statement?

Return True And Return False -- What Means What?

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Hi room,

Hey, I opened up the source code for this page in google chrome and since i'm learning javascript, i wanted see if i could "read" it and figure out what was going on. I'm am having the hardest time understanding "return false" and "return true". Could someone step me through this via interpreting this code (in bold typeface):

Code:

	var DefaultValue = 'Search';						
	function clearSearch() {
	  if (document.searchForm.q.value == DefaultValue) {
		document.searchForm.q.value = '';
	  }
	}						
	function validateSearchHeader() {
		if ( document.searchForm.q.value == '' || document.searchForm.q.value.toLocaleLowerCase() == DefaultValue.toLocaleLowerCase() ) {
			alert('Please enter at least one keyword in the Search box.');
			document.searchForm.q.focus();
			return false;
		}
	  return true;
	}

Thanks!

Still Can't Fix Math.round !!!!

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Just started to learn java & came up with the following, but can't get the math.round to work. Anyone able to tell me where I'm going wrong please ???

<p>
<script type="text/javascript">// <![CDATA[
var metrics = {
"mm" : 1,
"cm" : 10,
"m" : 1000,
"inch" : 25.4,
"foot" : 304.8
};

function roundNumber(rnum, rlength) { // Arguments: number to round, number of decimal places
var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
document.roundform.numberfield.value = parseFloat(newnumber); // Output the result to the form field (change for your purposes)
}

function roundme(len, wid, sq){
math.round.len;
wid = math.round(wid);
sq = math.round(sq);
alert(len);

};

function roundNumber(rnum, rlength) { // Arguments: number to round, number of decimal places
var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
document.roundform.numberfield.value = parseFloat(newnumber); // Output the result to the form field (change for your purposes)
};

function changeme(id, action) {

var val = document.getElementById("sizegroup");
if (val.style.display == 'none') {
val.style.display = 'block'
} else {
val.style.display = 'none'
}

};

function convert(num, dec){
var val = document.getElementById("boxa").value;
var val2 = document.getElementById("boxb").value;
if(isNaN(val)){return val};
if(isNaN(val2)){return val2};
document.getElementById("boxc").value = val *
metrics[document.getElementById("choice1").value]/
metrics[document.getElementById("choice3").value];

metrics[document.getElementById("choice1").value]/
metrics[document.getElementById("choice3").value];

document.getElementById("boxd").value = val2 *
metrics[document.getElementById("choice2").value]/
metrics[document.getElementById("choice4").value];

document.getElementById("sqmtrs").value = document.getElementById("boxc").value * document.getElementById("boxd").value ;

document.getElementById("boxc").value = math.round(document.getElementById("boxc").value);

};

var interval = null;
function watchChanges(){
interval == null ? setInterval("convert()", 500) :
clearInterval(interval);

}
// ]]></script>
</p>
<p>Length in imperial-metric / Width in imperial-metric</p>
<div><input id="boxa" style="width: 40px;" onfocus="watchChanges()" onblur="watchChanges()" type="text" /><select id="choice1" onchange="convert();"> <option value="mm">millimeters</option> <option value="cm">centimeters</option> <option value="m">metres</option> <option selected="selected" value="foot">feet</option> <option value="inch">inches</option> </select>

<input id="boxb" style="width: 40px;" onfocus="watchChanges()" onblur="watchChanges()" type="text" /><select id="choice2" onchange="convert()"> <option value="mm">millimeters</option> <option value="cm">centimeters</option> <option value="m">metres</option> <option selected="selected" value="foot">feet</option> <option value="inch">inches</option> </select></div>

<div><input id="boxc" style="width: 40px;" type="text" disabled="disabled" /><select id="choice3" onchange="convert()"> <option value="mm">millimeters</option> <option value="cm">centimeters</option> <option selected="selected" value="m">metres</option> <option value="foot">feet</option> <option value="inch">inches</option> </select>

<input id="boxd" style="width: 40px;" type="text" disabled="disabled" /><select id="choice4" onchange="convert()"> <option value="mm">millimeters</option> <option value="cm">centimeters</option> <option selected="selected" value="m">metres</option> <option value="foot">feet</option> <option value="inch">inches</option> </select></div>
<p> </p>
<div>Total sq metres : <input id="sqmtrs" style="width: 40px;" type="text" value="" disabled="disabled" /></div>
<p> </p>
<div class="label">Please round up to half a metre when choosing</div>
<table border="0" cellspacing="0" cellpadding="5">
<tbody>
<tr>
<td>Round:</td>
<td><input type="text" name="numberfield" value="" /> to <input type="text" name="decimalfield" value="2" size="3" /> decimal places</td>
</tr>
<tr>
<td>Result:</td>
<td><input type="text" name="roundedfield" value="" /> <input onclick="roundNumber(numberfield.value, decimalfield.value);" type="button" value="Calculate" /></td>
</tr>
</tbody>
</table>

Javascript Math. Help

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I'm new to programming and can't figure out why this won't work:

Code:

print "   var 1A == Math.sqrt(Math.pow(B,2) - Math.pow(C,2)); \n";
print "   var 1B == Math.sqrt(Math.pow(A,2) + Math.pow((F + G),2)); \n";
print "   var 1C == B + D; \n";
print "   var 1D == C - B; \n";
print "   var 1E == E; \n";
print "   var 1F == (Math.sqrt(Math.pow(C,2) - Math.pow(A,2)) - G); \n";
print "   var 1G == (Math.sqrt(Math.pow(C,2) + Math.pow(A,2)) - F); \n";
print "   var 1H == ((F + G) / B); \n";

I have tried debugging it using Firebug and I get this error:
Quote:
identifier starts immediately after numeric literal
I get the error on the line with var 1A, but I'm pretty sure that 1B, 1F, and 1G would all have the same error. Thanks for the help in advance guys!

BTW the reason why the code is being printed is because I'm programming with Perl and running on a webpage using html and javascript.

Math Question

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if ((word[0].match(/one|two|three|4|five|six|seven|eight|nine|ten/)) && (word[1].match(/plus|add/)) && (word[2].match(/one|two|three|4|five|six|seven|eight|nine|ten/))) {

document.result.result.value = "The answer is ?"; 
return true;}

Perspective Math

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I'm making a 3d pie chart. I have the points and the correct method to fill everything but when the slice rotates I want to make the outer edge filled, but in order to do that I have to figure out what math I use to find the leading edge.
I made a picture to hopefully explin what I need to find. I figure it might be the tangent but I was hoping someone smarter than I could send me in the right direction. I just need someone to help me pinpoint my next step.

Right now the rendering uses start and end angles to first make the top and bottom sections, fills them and then it makes an arc along the top of the slice from start to end then from end to start on the bottom slice and completes the polygon by going back the first point in the arc.

I need to make two separate polygons if the end or start are further from the center than the( tangent?) point. Need some advice.

Hope someone has an idea.

Math And Date Help

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I can't wrap my head around this at the moment so with the hope of finding someone willing to take a stab I am posting this to all of you.

I need to create a savings ticker that shows $ saved per second.

The data is as follows

then = date script is created
now = current date
std = savings to date in $
avg = average savings per second in $

It would need to calculate the difference in time between then and now, convert that to an integer that can then be multiplied by avg then std would be added.

thanks in advance

Js Math.sin() Problem

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Either I made an uh-oh, or there is a serious problem with Javscripts math functions. Math.sin(x) returns the sine of x in radians. Last time I checked, the sine of pi radians is 0, but in javascript:
Code:

Math.sin(Math.PI) // returns 1.2246467991473532e-16

Any idea why?

Julian

Help With Simple Math.

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I'm a student learning javascript, I'm having a very basic problem. I have to write a script that outputs XHTML text that keeps displaying in the browser window that multiples of the integer 2, namely 2, 4, 8, 16, 32, 64, etc.

This is the code i have,

Code:

<!--
        var product=2; 

	    while {	
		product =2*product; 
	     }
		
             document.writeln( +product+ );
// -->

And it pretty much does nothing. Help would be much appreciated

Dave

Simple Math Calculations

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Hi. I am new to javascript programming so please go easy on me.
I am creating a website for a flooring store and need to include a price calculator/estimator.
What I need to do is allow the visitor to input the room size (length x width) and choose a flooring material from a pulldown list, and receive a price.
The pulldown list would have flooring materials such as carpet, tile, wood, etc and each of these would have a fixed dollar amount associated with them (which would be hidden).

So basically it is just a script that would multiply 3 numbers, with two of the numbers being input by the visitor, and the third being selected from the pulldown.

Can this be done with Javascript, and can someone please educate me on how to do this?

Simple Math Calculation

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Hi. I am new to javascript programming so please go easy on me. I am creating a site for a flooring store and need to include a price calculator/estimator.
What I need to do is allow the visitor to input the room size (length x width) and choose a flooring material from a pulldown list, and receive a price.
The pulldown list would have flooring materials such as carpet, tile, wood, etc and each of these would have a fixed dollar amount associated with them (which would be hidden).
So basically it is just a script that would multiply 3 numbers, with two of the numbers being input by the visitor, and th tird being selected from the pulldown.
Can someone please educate me on how to do this?

Help With Math Functions..looping Them

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Im trying to get all of these math functions into one table with each one going into an individual row. The following is what my Grad Assistant gave us as instructions..he is not real helpful..lol

The goal of project to is to create a webpage that makes use of javascript to perform a dynamic number of operations. The program must first ask for a number of operations to perform (n).It is therefore required that a loop construct be used. The program will then ask the user n times what operation they would like to perform and the appropriate inputs for that operation. All of the operations will use integer type inputs except ceiling, floor, and round which will use float types.
The required operations for this project will be

1. +
2. *
3. /
4. %
5. min
6. max
7. floor
8. ceil
9. round

The output of each operation will be stored in a table. The required outputs for each row are the operation requested, the expression for the operation showing its structure (see below), the result of the operation and additionally a random number. The random number should be within one and the number of operations requested. (ex: 5 operations requested, random number is in the range 0-5)
A sample of what this output will look like is shown here.

let me know if you can help it is much appreciated..the course book does not cover most of what is being taught and in class time could be better spent self taught! lol ..midterms suck and its almost time for the weekend so I could really use some help!! thx again

Javascript Math To Generate A Value

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ok so heres where I stand, I don't know too much about javascript. Just enough to get me by. I am a PHP developer, I know how to do this in PHP but the client insists on doing it through javascript.

Basically there are 3 different form values that determine the Premium Death Benefit Ratio.

This is the formula the client wants:
Premium to Death Benefit Ratio % (Created by formula = Annual (Level) Premium Amount (Divided by) Death Benefit Amount (equals a percentage) That percentage multiplied by Life Expectancy

The 3 form values in the formula would be Annual Premium Amount (fypremium), Death Benefit Amount (dbp), Life Expectancy (average_le)

I was messing around with javascript trying to figure it out and I have gotten no where since I am not used to writing formulas in JS. Anyways here is what I have so far:

Code:

function calculateLE(inputFieldId1, inputFieldId2, inputFieldId3, outputFieldId){
	var DBR;
	
	var input = document.getElementById(inputFieldId).value;
	
	APA = document.getElementById(fypremium).value;
	DBA = document.getElementById(dbp).value;
	LE  = document.getElementById(average_le).value;
	
	formula = document.getElementById(fypremium).value / document.getElementById(dbp).value = formula3;
	formula2 = document.getElementById(average_le).value * formula3;
	
	if { APA = "" } {
		document.getElementById(outputFieldId).value = "Error getting Annual Premium Amount";
	}
	else if { DBA = "" } {
		document.getElementById(outputFieldId).value = "Error getting Death Benefit Amount";
	}
	else if { LE = "" } {
		document.getElementById(outputFieldId).value = "Error getting Life Expectancy";
	}
	else {
		document.getElementById(outputFieldId).value = formula3;
	}
}

Now I honestly have no clue if I am on the right track but what i've found on the net hasnt really pointed me in the right direction

Here is the form values.

Code:

<input type="text" name="fypremium" id="fypremium" onblur="calculateLE('fypremium', 'dbp', 'average_le', 'premium_dbr')">
<input type="text" name="dbp" id="dbp" onblur="calculateLE('fypremium', 'dbp', 'average_le', 'premium_dbr')">
<input type="text" name="average_le" id="average_le" onblur="calculateLE('fypremium', 'dbp', 'average_le', 'premium_dbr')">

In a nut shell the values for the 3 inputs stated above will determine premium_dbr's value.

fypremium / dbp = percentage;
average_le * percentage = DBR (death benefit ratio);

If someone could point me in the right direction to finishing this id be very greatful.

Getting Nan Error With Simple Math

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I am at a lost, new to JavaScript and not sure why I am getting Nan

Code:

<script type="text/javascript">
    
    var num1;
    var num2;
    var num3;
    var ave_num=Math.round((num1 + num2 + num3) / 3);
    
    
//follow prompts to enter numbers and print average

    </script>

Firefox Math Messing Up Somehow?

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Code:

<script type="text/javascript">
function countItDown(){
	var current=parseFloat(document.getElementById("currentsecondscount").value);
	var seconds=current;
	document.getElementById("debug").innerHTML="S "+current;
	var minutes=Math.floor(seconds/60);
	document.getElementById("debug").innerHTML+="<br>M "+minutes;
	var hours=Math.floor(minutes/60);
	document.getElementById("debug").innerHTML+="<br>H "+hours;
	var days=Math.floor(hours/24);
	document.getElementById("debug").innerHTML+="<br>D "+days;
	var remainingseconds=seconds-(minutes*60);
	document.getElementById("debug").innerHTML+="<br>RS "+remainingseconds;
	var remainingminutes=minutes-(hours*60);
	document.getElementById("debug").innerHTML+="<br>RM "+remainingminutes;
	var remaininghours=hours-(days*24);
	document.getElementById("debug").innerHTML+="<br>RH "+remaininghours;
	
	if(days<10){ days="0"+days; }
	if(remaininghours<10){ remaininghours="0"+remaininghours;}
	if(remainingminutes<10){ remainingminutes="0"+remainingminutes;}
	if(remainingseconds<10){ remainingseconds="0"+remainingseconds;}
	
	document.getElementById("days").innerHTML=days;
	document.getElementById("hours").innerHTML=remaininghours;
	document.getElementById("minutes").innerHTML=remainingminutes;
	document.getElementById("seconds").innerHTML=remainingseconds;
	document.getElementById("currentsecondscount").value=(current-1);
}
</script>
.......
<input type="hidden" id="currentsecondscount" value="<?=$seconds;?>" />
.......

Chrome/IE/etc on Left... FF 3.6.3 [windows] on Right

im not sure why Firefox is doing this. it seems to work fine on Firefox 3.6.3 for Mac...

Change Css Property With Math

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I have this simple manual photo slide show. It shows four photos and when you click the next button and it moves one photo over and one photo back for the previous button. I have to moving by changing the CSS property of 'left' by 195 pixels each move. So for it to move next it will subtract 195 pixels from the left property and for moving back it add 195 pixels to the left property. I have the code setup so when you click it changes the property of left to either -195 or 195 pixels but I need it so it actually does the math, not just give it a set value. But I don't know how to do that.

Code:

function MM_changeProp(objId,x,theProp,theValue) { //v9.0
  var obj = null; with (document){ if (getElementById)
  obj = getElementById(objId); }
  if (obj){
    if (theValue == true || theValue == false)
      eval("obj.style."+theProp+"="+theValue);
    else eval("obj.style."+theProp+"='"+theValue+"'");
  }
}
function nextPhoto() {	
	MM_changeProp('fanThumbWrapOne','','left','-195px','DIV')
}
function prevPhoto() {	
	MM_changeProp('fanThumbWrapOne','','left','195px','DIV')
}

so where you see -195px and 195px in the functions for nextPhoto and prevPhoto I need those to actually be functions where it subtracts 195px or adds 195px.