High Precision Calculator Using Script?
Jan 29, 2009highprecisioncalculator in java script
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ParseFloat Precision.
Jul 23, 2005I have a form form1 where user enters two values input1 and input2.
Then a function addValues () is called:
function addValues()
{
var var1 = parseFloat(document.form1.input1.value)
var var2 = parseFloat(document.form1.input2.value)
document.form1.output.value = var1 + var2
}
When I enter 4.0001 and 1.0001 the result in my script is not 5.0002 but
5.0001999999999995 Of course this is sufficiently precise in most uses, or can be rounded off. Still I have seen no other language where rounding errors are so prominent after one simple addition.
Are these errors a result of parseFloat() ? Am I missing something crucial ?
Is there an easy way to increase the precision?
Loss Of Precision During Multiplication
Apr 27, 2005Multiplication of numbers do not give a right value
For eg.
9090909090909.8 * 100 = 909090909090980.1
Why is it so? Is there a way to save the loss of precision.
Actually i want numbers to be rouned to the nearest 2 decimal places only
so Math.round(9090909090909.8 * 100) / 100 is the formula i am using, and hence the multiplication with 100 was required. Since the multiplication give a faulty value, the final result is also not as expected.
I was suprised with the fact
alert(9090909090909.8112) alerts only "9090909090909.8"
JQuery :: Calling A Function - Set Up A Toggle To Allow Users To Show More Precision When A User Clicks A Button
Oct 1, 2009I am trying to set up a toggle to allow users to show more precision when a user clicks a button. I have a function high() that doesn't do anything when it is called. I am fairly new to jQuery so I am not to familiar with the syntax.
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Feb 13, 2007I have a team website that has several games for entertainment. One
of the games is a javascript version of yahtzee. Can someone suggest
a way, using javascript, to record a high score for the game instead
of a high score for a particular user, session, or computer. Perhaps
someone already has code written to do this.
Loading Low Res Image Then High Res?
Sep 15, 2010We are currently trying to locate the JS that will allow us to implement a progression of low-res-->hi res load for the big background images we have on each page of our new web site.In other words, we have a ginormous photo in the background, and want to avail the browser a very lo res version of said photo while the big photo loads.I have a feeling this is a real rookie question, but still, if there is anyone that can advise I'd be super grateful
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Nov 22, 2011I am a back en developer and really don't understand event driven/front end development so if I use newbie terms or make no sense please bare with me. Could someone point me to some tutorials on how I might render something if and only the local machine has good processing power/ram. I am going to be rendering some stuff which will require quite a lot of processing power on the local side. Just a threshold thing really nothing predictive or anything just if ram is more than 1GB and processor faster than a P4 or something like that.
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Feb 4, 2010I am fairly new to javascript but I am an experienced php programmer. I have been parsing XML information using php, but my CPU usage has been too high recently due to this. I am trying to convert my scripts to javascript, but I am unsure how I can do this using javascript. I think that if I get started off, the rest will be easy.
One of my XML files is located at
Code:
http://ws.audioscrobbler.com/2.0/?method=user.getrecenttracks&user=bbcradio1&api_key=c910b0bc1e2d4e64964ebcd2d69c255c&limit=500
Basically I have been trying to grab the Name, Artist and large image of the most recent <track>.
JQuery :: If/then Load Content To Div Causing High CPU?
Mar 24, 2010I am implementing a fairly large Javascript file that has many if/than's that decide whether to load new content into div's. I have noticed this is causing high client side CPU utilization. Is there any better way to do this besides having the example script below repeated many times... i need to keep CPU usage down.
Code:
<script>
$(document).ready(function()
{
//ajaxTime.php is called every second to get time from server
[Code]....
JQuery: Good For High Traffic Sites?
Nov 1, 2007The jQuery library is definitely very useful for those who have development background experiences but don't have the time to learn Javascript in it's true nature. I've played with it on and off, on a few smaller sites I manage, and the outcome was truly amazing. I don't know Javascript at all, aside from the basics and I was able to create a very fun and fast UI very quickly for my visitors. I wonder though; Does the jQuery library hold up efficiency for larger sites?
I currently manage a site with over 1.6 million post, averaging around 15,000 post per day this month. With me not having the time to really learn Javascript and I don't have much of a budget to hire someone to do the work I want yet, it would seem logical to use jQuery if I already know how to use it, right? I just worry, with the growth rate for the site at it's all time high, I'm afraid that jQuery will do more bad then good.
Are there any high traffic sites successfully using jQuery that you know about? has anyone experimented with jQuery on their high traffic sites? Would it seems more sensible to hire someone to do the Javascript work?
JQuery :: Bind HTML Attribute To High-lighted Text?
Sep 29, 2010I'm working on an interactive website where the user can change the font attributes of the text within the page they're reading. Is there a way to bind, for example, bold tags around a snippet of text the user has high-lighted? What I mean (if that wasn't clear) is if the user is reading through the text on the page and drags their mouse over a piece of text then clicks a button and it turns bold, much like a rich text editor would work, is this possible to do?
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Jul 12, 2011I am trying to see if the following can be achieved using Jquery I need to create a thumbnail gallery, where when a user hovers over any thumbnail image they would get an option to download the image either in High or Low resolution. Something like how you see in the below mockup.
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Oct 4, 2009I am working on an Mpg calculator and I am stuck.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
I have a mistake when it is suppose to calculate.
Make A Calculator App?
Mar 25, 2011I'm trying to make a calculator app; with a few differences. I have a text field with a numberpad below it, I got the numbers to show up in the text field, but am unsure as to how when I hit the enter button - it would store them in a variable?...I am also wondering as to how it would store current value and then allow me to input another value(maybe on the next page) and either subtract or add to it(the first value that is stored).I am also wondering how to get a decimal point in place(need it for currency).
Here is my code:
<html>
<head>
<script type = "text/javascript">
[code].....
Creating A Less Than Or More Than Calculator?
Dec 2, 2011I have the last assignment that she wants us to do and I had to pull up another assignment that she wanted us to build upon( which is one of those coding without anything advance)
<html>
<head>
<title>
[code]....
now she wants us to do max <beta and then name the variables with if a<b and I don't know if I put that in the concatenation or what to name my variables!
Price Calculator
Jan 4, 2007I am trying to create a price calculator that automatically calculates the price of custom made picture frame. I got an equation that finds the square area of the frame by multiplying the perimeter (2*length*width) by the thickness (which the user can choose from 1.5", 2" or 3"). Then it multiplies it by a decimal number (0.27 if the frame is 1.5" thick, 0.23 if its 2" thick, and 0.18 if its 3" thick). Then it adds a $5 custom made fee to the final answer. But when I save it to an html file and load it in Internet Explorer, it doesn't calculate. Code:
View 5 Replies View RelatedField Calculator
Jul 26, 2007I'm having some problems with a calculator that I'm working on and am stumped on a particular situation regarding adding additional script and how it should be written. I've searched the forum and the web and just cant locate a viable solution. Code:
View 1 Replies View RelatedBasic Calculator
Dec 6, 2003I know there is a million of them but here's a little calculator script I made just for kicks. Feedback is always appreciated, good or bad.
I think I did a pretty good job of mirroring the windows calculator functionality.
Basic keys are mapped (optionally) to the keyboard.
<html>
<head>
<title>Web Calculator</title>
<style type="text/css">
table
{
text-align:center;
background-color:#e5e5c5;
}
.button
{
width:55px;
font-weight:bold;
background-color:lightblue;
color:#333399;
}
.functbut
{
width:55px;
font-weight:bold;
background-color:lightblue;
color:red;
}
.back
{
width:115px;
font-weight:bold;
background-color:lightblue;
color:red;
}
.header
{
color:#333399;
}
#display
{
text-align:right;
}
</style>
<script type="text/javascript">
var find=document.getElementById;
var temp=0;
var total=0;
var which=0;
var m=0;
function Mplus()
{
m=parseFloat(find('display').value) + m;
find('memory1').value="M+*";
}
function Mclear()
{
m=0;
find('memory1').value="M+";
}
function Mrecall()
{
find('display').value=m;
}
function Mreplace()
{
m=find('display').value;
}
function showMe(num)
{
if(temp==0)
{
find('display').value=num;
temp=1;
}
else
{
find('display').value+=num;
}
}
function calcEm(num)
{
str=parseFloat(find('display').value);
if(which==0)
{
total=find('display').value;
temp=0;
which=num;
}
else if(which==1)
{
find('display').value=parseFloat(total)+ str;
total=find('display').value;
which=num;
temp=0;
}
else if(which==2)
{
find('display').value=parseFloat(total) * str;
total=find('display').value;
which=num;
temp=0;
}
else if(which==3)
{
find('display').value=parseFloat(total) / str;
total=find('display').value;
which=num;
temp=0;
}
else if(which==4)
{
find('display').value=parseFloat(total) - str;
total=find('display').value;
which=num;
temp=0;
}
}
function clearAll()
{
find('display').value=0;
which=0;
temp=0;
total=0;
}
function clearDisplay()
{
find('display').value="0"
temp=0;
}
function fractIt()
{
find('display').value=(1) / str;
}
function getPerc()
{
var d=find('display').value=str / 100;
calcEm(0);
}
function backSpace()
{
find('display').value=find('display').value.substring("0",find('display').value.length-1);
}
function getRoot()
{
find('display').value=Math.sqrt(find('display').value);
}
function invertIt()
{
var w=find('display').value.indexOf("-");
if(w==-1)
{
find('display').value="-" + find('display').value
}
else
{
find('display').value=find('display').value.substring("1",find('display').value.length);
}
}
function keyHandler()
{
keys=new Array();
keys[97]=("1");
keys[98]=("2");
keys[99]=("3");
keys[100]=("4");
keys[101]=("5");
keys[102]=("6");
keys[103]=("7");
keys[104]=("8");
keys[105]=("9");
keys[96]=("0");
keys[13]=("equal");
keys[107]=("plus");
keys[110]=("dot");
keys[109]=("minus");
keys[106]=("times");
keys[111]=("divide");
keys[110]=("dot");
keys[8]=("back");
keys[27]=("clear");
kc=window.event.keyCode;
if(keys[kc]!=undefined)
{
cColor('#333399');
setTimeout('cColor("lightblue")',100);
find(keys[kc]).click();
}
return false;
}
function cColor(bcolor)
{
find(keys[kc]).style.background=bcolor;
}
function keyOnOff()
{
var b=find('keychoice').checked
if(b==true)
{
document.onkeydown=keyHandler;
}
else
{
document.onkeydown="";
}
}
function checkHandler()
{
var e=find('keychoice').checked
if(e==false)
{
e=true;
}
else
{
e=false;
}
keyOnOff();
}
</script>
</head>
<body>
<table cellspacing="0" border="1">
<thead>
<th colspan="6" class="header">Web Calculator</th>
</thead>
<tr>
<td colspan="6"><input type="text" size="43" id="display" value="0."></td>
</tr>
<tr>
<td colspan="2"><input type="button" value="Backspace" id="back" class="back" onclick="backSpace()"></td>
<td colspan="2"><input type="button" id="ce" value="CE" class="back" onclick="clearDisplay()"></td>
<td colspan="2"><input type="button" id="clear" value="C" class="back" onclick="clearAll()"></td>
</tr>
<tr>
<td><input type="button" class="functbut" value="MC" onclick="Mclear();"></td>
<td><input type="button" class="button" id="7" value="7" onclick="showMe(ƍ')"></td>
<td><input type="button" class="button" id="8" value="8" onclick="showMe(Ǝ')"></td>
<td><input type="button" class="button" id="9" value="9" onclick="showMe(Ə')"></td>
<td><input type="button" class="functbut" id="divide" value="/" onclick="calcEm(3)"></td>
<td><input type="button" class="button" id="sqrt" value="sqrt" onclick="getRoot();"></td>
</tr>
<tr>
<td><input type="button" class="functbut" value="MR" onclick="Mrecall();"></td>
<td><input type="button" class="button" id="4" value="4" onclick="showMe(Ɗ')"></td>
<td><input type="button" class="button" id="5" value="5" onclick="showMe(Ƌ')"></td>
<td><input type="button" class="button" id="6" value="6" onclick="showMe(ƌ')"></td>
<td><input type="button" class="functbut" id="times" value="*" onclick="calcEm(2)"></td>
<td><input type="button" class="button" id="perc" value="%" onclick="getPerc()"></td>
</tr>
<tr>
<td><input type="button" class="functbut" value="MS" onclick="Mreplace();"></td>
<td><input type="button" class="button" id="1" value="1" onclick="showMe(Ƈ')"></td>
<td><input type="button" class="button" id="2" value="2" onclick="showMe(ƈ')"></td>
<td><input type="button" class="button" id="3" value="3" onclick="showMe(Ɖ')"></td>
<td><input type="button" class="functbut" id="minus" value="-" onclick="calcEm(4)"></td>
<td><input type="button" class="button" id="x" value="1/x" onclick="fractIt()"></td>
</tr>
<tr>
<td><input type="button" class="functbut" value="M+" id="memory1" onclick="Mplus();"></td>
<td><input type="button" class="button" id="0" value="0" onclick="showMe(Ɔ')"></td>
<td><input type="button" class="button" id="flop" value="+/-" onclick="invertIt()"></td>
<td><input type="button" class="button" id="dot" value="." onclick="showMe(this.value)"></td>
<td><input type="button" class="functbut" id="plus" value="+" onclick="calcEm(1)"></td>
<td><input type="button" class="functbut" id="equal" value="=" onclick="calcEm(0)"></td>
</tr>
<tr>
<td colspan="6" class="header">Num Pad On:<input type="checkbox"
id="keychoice" onclick="checkHandler();keyOnOff();"></td>
</tr>
</table>
</body>
</html>
Happy Calculating...
Shipping Calculator
Jan 17, 2006I'm attempting to create a shopping cart shipping calculator using the total $ provided by the cart itself (%total%). Basically the script needs to take the %total%, compare it to a bunch of arrays in the javascript, and provide the shipping charge as a percentage of the total. For example:
The cart total ends up being $15 (or %total%).
The set rates for shipping are:
Standard Shipping
$1 - $4.99 : 7.95% (of total)
$5 - $9.99 : 9.95%
$10 - $19.99 : 11.95%
Overnight Shipping
$1 - $4.99 : 9.95% (of total)
$5 - $9.99 : 11.95%
$10 - $19.99 : 19.95%
Two radio buttons would show the 2 shipping options and the shipping charges like this:
O Standard: $1.79
O Overnight: $2.99
Make Calculator To Be A Pop Up
Feb 19, 2009I have a simple calculator written using javascript and html. I would like to make it such that when a link to the calculator is clicked, a pop up window with this calculator appears rather than referring a user to anew page.
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May 26, 2010I am working on a script that calculates the rental rate for a property. I currently have this code and form, which works as I wish it to.
Code:
<script type="text/javascript">
function roundCents(amount) {
[code]....
Get A Calculator To Work With IF/THEN?
Oct 19, 2010I am trying to make a calculator that calculates the amount of words inputted (words) and multiplying it with a variable decided by an If/Then statement. The way I want it to work is that if there is 1-10,000 inputted it multiplies whatever that amount is by .29, and if there is 10,000-20,000 by .26, and anything more than 20,000 by .24. This is what I have come up with so far:
Code JavaScript:
<script type="text/javascript">
function wordcount(){
[code]....
JS Calculator Not Working In Mozilla But Ok In IE
Feb 26, 2010I have an online calculator in javascript which works in IE but not Moz.
site: [URL]
code:
function workit()
{
var xsource = new Array(0,0.09,0.1); // source language
var xtarget = new Array(0,0.09,0.10,0.12,0.14); // target language
[Code]....
Time Calculator For Website?
Nov 24, 2010I am trying to implement a time calculator onto my website with preset times to tell how long it would take to make troops. Say you want to make 100 Catapults and each Catapult takes one minute and ten seconds to make, I would like to be able to show the time in days /hours / minutes preferably in the format of 0:00:00. I would like it so someone can type in the amount of troops they want. There are Infantry that take 0:00:22, Cavalry that take 0:00:52, Archers that take 0:00:35 and Catapults that take 0:01:10.
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Nov 23, 2011Show a checkbox list with names of the coins. The user picks the coins he/she has and presses submit.
Then prompt boxes show up asking how many toonies you have (if the user selected toonies) and it does that for each one that has been checked marked.I've tried this
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
[code]....
Javascript Currency Calculator
Mar 3, 2007I am trying to write a currency calculator that can convert between 4 currencies.
I have managed to get as far as to convert from one currency to the other 3 but can not make it convert between the others. Could you please give me some advice how to continue? Code: