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JavaScript - Math Round Situation
i had to create a function to calculate percentage and round to integer
need 2 parameters of item and sum function will return value of item variable divide the sum by 100 and round to nearest integer using Math.round this is my code that i came up with Code: function calcPercent(item,sum){ // script element to calculate the percentage which is rounded to the nearest integer
var items = Math.round( (item/sum)*100); // script element to get the percentage
return items;
}
calcPercent(1, 3);
Does this make sense? thanks Similar TutorialsJust 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> Having trouble with the alert(Math.round coding. "r" is the results or final value, and I want to divide this result/final value by "f" I have alert(Math.round(r / f) + ' calories/day to burn); but I its coming up saying NaN calories/day to burn. How do I divide "f" into "r" correctly? Code: }
function calculate() {
var f = document.forms[0], g, w, f, h, a, l, r;
for (var i=0; i<(f.length-1); i++) {
if (f.elements[i].selectedIndex == 0) {
alert('Sorry, all options must be selected.');
return false;
}
}
g = f.g.options[f.g.selectedIndex].value;
w = f.w.options[f.w.selectedIndex].value;
h = f.h.options[f.h.selectedIndex].value;
a = f.a.options[f.a.selectedIndex].value;
l = f.l.options[f.l.selectedIndex].value;
if (g == 'm') {
r = ((66 + ((13.7 * w) / 2.2) + (5 * h * 2.54)) - (6.8 * a)) * l;
} else {
r = ((655 + ((9.6 * w) / 2.2) + (1.8 * h * 2.54)) - (4.7 * a)) * l;
}
alert(Math.round(r) + ' calories/day is what you require');
alert(Math.round(r / f) + ' calories/day to burn);
return false;
i have a program where a user enters a temperature in farenheit and the program converts it to celcius. below is my code: Code: <html>
<head>
<title>JavaScript Assignment 4 Part 1</title>
</head>
<body>
<h2>Welcome to the Temperature Calculator!!</h2>
<script type="text/javascript">
var fTemp;
var number1;
var cTemp;
fTemp = window.prompt( "Please enter temperature in Farenheit:", "0" );
number1 = parseInt( fTemp );
cTemp = (5/9) * (number1 - 32);
document.writeln("The corresponding temperature in Celcius is: " + cTemp);
</script>
</body>
</html>
what i cant figure out is how to round off the temperature in celcius so that it doesnt display something like 26.666666666667 i tried putting math.round in "cTemp = (5/9) * (number1 - 32);" but when i do my program doesnt work any advice on how to go about doing this? thanks Hi All, i have this Regex which is below and im trying to validate a field when a button is clicked i may have this mest up but what the regex does it checks for 1 decimal place and returns true or false i put some comments in with the code Code:
function IsNewBid() {
var NewBid = document.getElementById('MainContent_txtNewBid').value;
var result;
result = ^[0-9]{1,10}[.]{1}[0-9]{1,2}$|^[0-9]{1,10}$(NewBid .Value)
if (result 'Equals False So theres and error')
Do something
else{
carry on
}
}
Any help will be highly appreciated.. Thank you for your time. Hello all. I would like a helping hand on this assignment. Its on the above function. here is the assignment. It is on The Sieve of Eratosthenes The Sieve of Eratosthenes An integer is a prime number if it is evenly divisible by only itself and 1. There are several ways to find all prime numbers within a given range of integers, and the Sieve of Eratosthenes is an algorithm for to do just that. It operates as follows: Create an array with all elements initialized to 1 (true). Array elements with prime subscripts will remain as 1. All other array elements will eventually be set to zero. Starting with array subscript 2 (subscript 1 must be prime), every time an array element is found whose value is 1, loop through the remainder of the array and set to zero every element whose subscript is a multiple of the subscript for the element with value 1. For array subscript 2, all elements beyond 2 in the array that are multiples of 2 will be set to zero (subscripts 4, 6, 8, 10, etc.); for array subscript 3, all elements beyond 3 in the array that are multiples of 3 will be set to zero (subscripts 6, 9, 12, 15, etc.); and so on. When this process is complete, the array elements that are still set to 1 indicate that the subscript is a prime number. These subscripts can then be printed. Write a script that uses an array of 1000 elements to determine and print the prime numbers between 1 and 999. Ignore element 0 of the array. ______________ Basically I am lost to what I am supposed to do on this assignment. I would like some clues on how to start this and what exactly my output should be? I know i posted this already. I figure I repost properly and get some more views on this. one. This is all in javascript. Thanks Hey Guys, I'm working on a site and it needed borders with opacity, and since you can do it with CSS I done it With jQuery. But now I would like to round the corners of it, I did try border-radius, but it's only effecting the containing div not the borders(see below). Is there a solution to this? Here's the small snippet of JS: PHP Code: $('.mainContent').border({ width: 6, color: 'white', alpha: .4 }); Hi, First time user of Javascript and built an online calculator, trouble is I dont know where or how to code it so the answer ends with only 2 decimals I have embedded code, help appreciated. Personally I think it's a miracle the darn thing works. Link to page it's on. Any help appreciated, I have searched and read but after hours of trying stuff gave up. <!-- function treevalue() { document.volume.result.value=(((3.14159*((document.volume.radius.value)*(document.volume.radius.valu e)))*(document.volume.height.value))/3)*(document.volume.base.value)*(document.volume.e.value)*(document.volume.fv.value)*(document.volum e.l.value); } // --> Thanks Eric Hello: I have this js function: Code: <script type="text/javascript">
function updatesum() {
document.PaymentForm.newbalance.value = (document.PaymentForm.balance.value -0) - (document.PaymentForm.paymentamount.value -0);
}
</script>
I want to round the value of Code: document.PaymentForm.newbalance.value to two decimal points. May I request some assistance! I was wondering if there is a way to find the total round trip time of a request. Addins like firebug and chromes console show you this round trip time but i was hoping there was a way to extract it from the response itself. I would also like to know the response time from when the server sent the request and the client received it. I do not think this is possible since the server and client have different timing systems but it would be very useful. Hi, my javascript calculates a total figure. It rounds it up though and I want it to give me a decimal (x2) total. Please help. Here is my code so far: Code: <script type="text/javascript">
function calculateText()
{
var op1=document.getElementById('Age02');
var op2=document.getElementById('Girl35');
var op3=document.getElementById('Boy35');
var op4=document.getElementById('Girl610');
var op5=document.getElementById('Boy610');
var op6=document.getElementById('Age11');
var op7=document.getElementById('Guest');
var op8=document.getElementById('VIP');
var op9=document.getElementById('School');
var op10=document.getElementById('3DFilm');
var op11=document.getElementById('BFast');
var op12=document.getElementById('PNGift');
var op13=document.getElementById('PStand');
var op14=document.getElementById('PLrg');
var op15=document.getElementById('PReP');
var op16=document.getElementById('KyMg');
var op17=document.getElementById('SnwGlb');
var op18=document.getElementById('PBbl');
var op19=document.getElementById('USB');
var op20=document.getElementById('SantaL');
var op21=document.getElementById('SantaK');
var op22=document.getElementById('FreeP');
var op23=document.getElementById('PUpgrd');
var op24=document.getElementById('StaffP');
var op25=document.getElementById('CompEntry');
var op26=document.getElementById('241');
var op27=document.getElementById('50Percent');
var op28=document.getElementById('Voucher');
var result=document.getElementById('Total');
if(op1.value=="" || op1.value!=parseFloat(op1.value)) op1.value=0;
if(op2.value=="" || op2.value!=parseFloat(op2.value)) op2.value=0;
if(op3.value=="" || op3.value!=parseFloat(op3.value)) op3.value=0;
if(op4.value=="" || op4.value!=parseFloat(op4.value)) op4.value=0;
if(op5.value=="" || op5.value!=parseFloat(op5.value)) op5.value=0;
if(op6.value=="" || op6.value!=parseFloat(op6.value)) op6.value=0;
if(op7.value=="" || op7.value!=parseFloat(op7.value)) op7.value=0;
if(op8.value=="" || op8.value!=parseFloat(op8.value)) op8.value=0;
if(op9.value=="" || op9.value!=parseFloat(op9.value)) op9.value=0;
if(op10.value=="" || op10.value!=parseFloat(op10.value)) op10.value=0;
if(op11.value=="" || op11.value!=parseFloat(op11.value)) op11.value=0;
if(op12.value=="" || op12.value!=parseFloat(op12.value)) op12.value=0;
if(op13.value=="" || op13.value!=parseFloat(op13.value)) op13.value=0;
if(op14.value=="" || op14.value!=parseFloat(op14.value)) op14.value=0;
if(op15.value=="" || op15.value!=parseFloat(op15.value)) op15.value=0;
if(op16.value=="" || op16.value!=parseFloat(op16.value)) op16.value=0;
if(op17.value=="" || op17.value!=parseFloat(op17.value)) op17.value=0;
if(op18.value=="" || op18.value!=parseFloat(op18.value)) op18.value=0;
if(op19.value=="" || op19.value!=parseFloat(op19.value)) op19.value=0;
if(op20.value=="" || op20.value!=parseFloat(op20.value)) op20.value=0;
if(op21.value=="" || op21.value!=parseFloat(op21.value)) op21.value=0;
if(op22.value=="" || op22.value!=parseFloat(op22.value)) op22.value=0;
if(op23.value=="" || op23.value!=parseFloat(op23.value)) op23.value=0;
if(op24.value=="" || op24.value!=parseFloat(op24.value)) op24.value=0;
if(op25.value=="" || op25.value!=parseFloat(op25.value)) op25.value=0;
if(op26.value=="" || op26.value!=parseFloat(op26.value)) op26.value=0;
if(op27.value=="" || op27.value!=parseFloat(op27.value)) op27.value=0;
if(op28.value=="" || op28.value!=parseFloat(op28.value)) op28.value=0;
result.value=0;
result.value=parseInt(result.value);
result.value=parseInt(result.value)+parseInt(op1.value*5)+parseInt(op2.value*5)+parseInt(op3.value*5)+parseInt(op4.value*5)+parseInt(op5.value*5)+parseInt(op6.value*5)+parseInt(op7.value*0)+parseInt(op8.value*8.50)+parseInt(op9.value*3.75)+parseInt(op10.value*0)+parseInt(op11.value*10)+parseInt(op12.value*5)+parseInt(op13.value*3)+parseInt(op14.value*4)+parseInt(op15.value*2)+parseInt(op16.value*4)+parseInt(op17.value*5)+parseInt(op18.value*3)+parseInt(op19.value*5)+parseInt(op20.value*4)+parseInt(op21.value*3)+parseInt(op22.value*0)+parseInt(op23.value*1)+parseInt(op24.value*0)+parseInt(op25.value*0)+parseInt(op26.value*4)+parseInt(op27.value*2)-parseInt(op28.value);
}
</script>
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. 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 hey. im working on a facebook app.. this is what i got so far. PHP Code: <script language="JavaScript"> <!-- var theImages = new Array() theImages[0] = "http://img688.imageshack.us/img688/4787/logo1tq.jpg" theImages[1] = "http://img641.imageshack.us/img641/8292/logo2yex.jpg" theImages[2] = "http://img864.imageshack.us/img864/4097/logo3ik.jpg" theImages[3] = "http://img543.imageshack.us/img543/9046/logo4pu.jpg" theImages[4] = "http://img21.imageshack.us/img21/2567/logo5q.jpg" theImages[5] = "http://img842.imageshack.us/img842/696/logo6o.jpg" theImages[6] = "http://img85.imageshack.us/img85/7831/logo7k.jpg" var j = 0 var p = theImages.length; var preBuffer = new Array() for (i = 0; i < p; i++){ preBuffer[i] = new Image() preBuffer[i].src = theImages[i] } var whichImage = Math.round(Math.random()*(p-1)); function showImage(){ document.write('<img src="'+theImages[whichImage]+'">'); } //--> </script> <script language="JavaScript"> <!-- showImage(); //--> </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 How can you add/substract two numbers in javascript if they are written out as words such as one|two|three|four|five|six|seven|eight|nine|ten. Code: 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;}
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. 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 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 Is it possible to built a conditional for a hover situation ? for example I wanto to do something only if the mouse is still over a DIV. Code: Something like this:
if (oObject.hover=true) {
do something;
}
How can I tell Javascript to check situations for Hovers on things ? 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>
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