Creating Calculator - How To Execute Operators
Jul 18, 2010
We are required to create a javascript calculator. The page should has 3 text box, first and second text box would allow the user to input numbers, the third textbox will show the answer. the arithmetic operations should be in radio button, drop-down list and the select option. I'm still working on the radio button and i don't how to execute the operators. How to grab the inputted number from the textbox and how to execute the operators.
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Jul 20, 2005
Is it possible to create URLs from function call operators?
For example, I'm trying to program an onClick function which will load a
webpage in one frame and an image in another, based on the name of the
button which is being clicked. So clicking the button with name="help" will
open "webpages/help_page1.html" in one frame, and "images/help.jpg" in
another.
To do this I was hoping that the following would work, where the function
had been called by
function activate(buttonName) {
webpageURL="webpages/"+buttonName+"_page1.html"
imageURL="images/"+buttonName+".jpg"
parent.frame1.location.href=webpageURL
parent.frame2.picture.src=imageURL
}
But this doesn't work, because the browser (IE6) looks for
"webpages[object]_page1.html" and "images[object].jpg".
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Dec 2, 2011
I 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!
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Oct 12, 2010
I am trying to create a monthly mortgage calculator, I have been able to make it show prompts for Amount of loan; Interest rate; and Term of loan (in months), but it will not display the results. Below is the code I have utilized to get this far.
[Code]....
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Oct 20, 2010
I am new to Java and my teacher goes way too fast in class and am a day behind on this calculator. Our assignment is to make a Calculator using AppendDigit and Else if functions in the java code. Some of my other code in html may be messed up as well. I am just lost so here is the HTML:
Code:
<title>John's Calculator</title>
<style type="text/css">
.rt {text-align:right; font-family: Courier New;}
.numbttn {text-align: center; background-color:
silver; font-family: Courier New; width 4eM;}
body {background-color: silver} .....
And Here is the pathetic Javascript which I have barely started:
Code:
// cal Applet- John Falco- 20 October 2010
function clear TB() {
document.form.kpd.display.value="0";
}
function AppendDigit (x) {
if (x==".") {
if ((!HasDecimal))
}
else {
document.forms.kpd.display.value =
document.forms.kdp.display.value + X;
};
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Nov 5, 2010
I am trying to place a Body Mass Index Calculator on a web page. I need a prompt box that asks the user to enter their weight and height (in pounds and inches, respectively). The box should calculate BMI as follows:BMI = (Weight / (Height * Height) ) * 703;After the BMI is calculated, I would like the box to display the user's status (obese, overweight, normal, underweight). After the user has entered all information, use the document.write function to display the following, with the customized information:
Height
Weight
BMI
Status
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Apr 20, 2010
I am basically trying to enter a name along with a mark and store this in a javascript cookie. From this I want to create the mean and graph for up to 100 results.This is the code:
<html>
<head>
<title>Class Marks Calculator</title>[code]....
I have been working on this for hours and do not understand where I am going wrong.
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Dec 22, 2010
I have a page on a website I am creating that has both a lightbox rel link and a quick calculator to work out a size of a product.Here are the links to the java files I am using:
<link rel="stylesheet" href="css/style.css" type="text/css" media="all" />
<link rel="stylesheet" href="css/jquery.lightbox.css" type="text/css" media="screen" />
<script type="text/javascript" src="scripts/jquery.js"></script>
[code].....
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Jul 20, 2005
Why would one use bitwise operators? I can program in various languages in
some shape or form (C++, PHP, some scripting) and I've heard/seen bitwise
operators before, but never understood why anyone would use them - any real
world examples or ideas? Examples follow (that I am reading in my Core
JavaScript Guide 1.5).
15 & 9 yields 9 (1111 & 1001 = 1001)
15 | 9 yields 15 (1111 | 1001 = 1111)
15 ^ 9 yields 6 (1111 ^ 1001 = 0110)
in addition there are AND,OR,XOR,NOT and left and right shifts which would
only extend this post longer than nescessary...
--
A: Because it messes up the order in which people normally read text.
Q: Why is top-posting such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet?
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Apr 26, 2006
Searched W3Schools site for information on JavaScript operators.
It doesn't seems to be an all inclusive source.
It doesn't have ? or :
I did learn what ? means from a book... But what does : mean/do?
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May 3, 2010
a. only logical operators
b. only comparison operators
c. both logical and comparison
d. you cannot use operators with an if statement.
this is from my javascript book review for the chapter.
you can use both right? sounds silly i know but just want to make sure for my test.
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Jul 1, 2010
Ok, this seems easy, but I am struggling. I have this...
$("a[href$='mp4']").click(function () {
But I want it to work for mp4 or mov or more. Something like...
$("a[href$='mp4'||href$='mov']").click(function () { <-- which doesn't work apparently
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Apr 28, 2011
I'd like to ask if it is possible to use conditional operators
var = condition ? var1 : var 2
To do the same job as the if-else statements I wrote in red below:
<p id="text">change text colour</p>
<br />
<a onclick="allsorting();">sort in both ascending & descending orders</a>
<div></div>
<script>
/* if & else */
function changetext(){
document.getElementById('text').onclick = function (){
swapcolour(this);
}}
function swapcolour(text){
if(text.style.color == 'black'){
text.style.color = 'red';
} else {text.style.color = 'black'}
} window.onload = changetext;
</script>
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Aug 20, 2011
I've got a slide toggle script online and have got just one bit that I cannot figure out why. What is (toggled = !toggled)? What does it mean? Does that mean toggled = false? But I tested it, it seems not like that. And once the slide is toggled, it should use the minheight. Then the condition for var Height must be the opposite of (toggled = !toggled). Then what is (toggled = !toggled) like? Is that like (toggled != !toggled)?
<!DOCTYPE html>
<html>
<head>
<title>Avinash</title>
<style>
#slider {
margin:0px auto;
padding:0px;
width:400px;
border:1px solid #000;
background:#0f0;
height:0px;
overflow:hidden;
} .....
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Aug 25, 2004
I have been looking for a way to give something back to this forum as it has helped me greatly, and I am hoping that this might be of value to someone.
Basically I was just tired of consistantly commenting and uncommenting out alerts in my code so I wrote some code that would allow me to keep my alerts and only show them when I wanted to, and only the types of alerts I wanted to show.
I thought that using bitwise operators would give me the flexibility to specify different options and a quick way of finding out what options were wanted. There are other ways of doing this of course, and this is one approach.
The bitwise OR operator "|" says if one of the two vars has the bit set, then set the bit.
the bitwise AND operator "&" says if both of the two vars has the bit set, then set the bit.
It starts with my bitwise values:
var NONE = new Number(0);// 00000000
var ALL = new Number(1);// 00000001
var INFO = new Number(2);// 00000010
var LOCAL = new Number(4);// 00000100
var PARAM = new Number(8);// 00001000
var COUNT = new Number(16);// 00010000
These values are really important. Earlier I used 0 through 5 and because of the way bitwise operations work, COUNT was equivelant to ALL and PARAM. what you are doing is blending bits and then getting a value. So, in the 0 through 5 approach, COUNT was 00000101 (5). When I OR'd ALL with PARAM I got 00000101 which was a result of 00000001 with 00000100 (4)! So be really careful if you go this route to double check that no combination of vars will equal other vars.
In our constructor we get the value thus:
function FormCheckBase( objForm, blnStateIsDebug, sCulture )
{
this.Form= eval('document.' + objForm);
this.Debug= new Number( blnStateIsDebug );
this.Culture= new String( sCulture );
}
with this call:
objFrm = new FormCheck( 'FormName', INFO | LOCAL | PARAM, sCulture );
Then in the instance methods of the FormCheck class, I wrap my alert boxes.
if ( this.ShowErrorAlert( this.PARAM ) ) // or whatever other value you want.
{
alert( sWhoAmI + "iArrayLength: " + iArrayLength );
alert( sWhoAmI + "blnBlank: " + blnBlank );
}
ShowErrorAlert does a bitwise "AND" to see if we have a match. We are also testing for ALL, and if that is passed originally, we are returning a true to show the alert.
FormCheckBase.prototype.ShowErrorAlert = function( iAlertBit )
{
var bitCompareResult = new Number(0);
var showMe = new Boolean(false);
bitCompareResult = (this.Debug & this.ALL);
showMe = ((bitCompareResult == this.ALL) ? true : false );
alert( showMe );
if ( showMe == true )
return showMe;
bitCompareResult = (this.Debug & iAlertBit);
showMe = ((bitCompareResult == iAlertBit) ? true : false );
return showMe;
};
I also did a couple of helper functions that would change the Debug var before I went into a method and reset it after I was done. Sometimes you might not want every single method to start showing alert boxes. So I did a SetDebugBits that sets the value of Debug and GetDebugBits that gets the current value of Debug. Call GetDebugBits first to store the current value, then call SetDebugBits to set it to whatever you want to use, and then make another call to SetDebugBits with the original value to set it back.
We mostly call our FormCheck constructor with the value of NONE, and then work on a method by method basis as we have lots of methods in the class.
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Oct 4, 2009
I 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.
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Mar 25, 2011
I'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].....
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Jan 4, 2007
I 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:
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Jul 26, 2007
I'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:
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Dec 6, 2003
I 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...
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Jan 17, 2006
I'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
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Feb 19, 2009
I 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, 2010
I 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]....
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Oct 19, 2010
I 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]....
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Feb 26, 2010
I 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]....
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Nov 24, 2010
I 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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