Calculator Calculation - 1st Number Entered Displaying It And Storing It In The Variable "memory"
Feb 13, 2011
This is calculator program that I have gotten stuck on. Here is where I think I am at:
The program is now taking the 1st number entered displaying it and storing it in the variable "memory".
Operation (+,-,*,/) is added to the memory in function action1() but then when the second number is entered it replaces memory with the second number. How can I get the variable memory to the whole string of 1st number,action, 2nd number?
Also once I do get that working correctly:
Wouldn't eval(document.calculator.display.value= memory) in my HTML for the "=" give me the calculation. (if I could figure out how to have memory store the 1st number and action1 and 2nd number all together) Or would eval(document.calculator.display.value) do it for me.
I'm working on a page that needs to do some calculations based on values that the user inputs via sliders. I can get the values selected to display in a text box below the slider, but I also need to store the value as a variable for use in calculations.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head>
The exercise problem is to "MODIFY the code in the "calculate_click" event so interest is added to future value just once each year for the number of years that they were entered by the user". The calculation as you see it below assumes an amount is invested MONTHLY (not just once), and the interest is calculated accordingly. This is what I think the problem is trying to calculate: using a $100 one time investment at 10% interest (compounded once annually) for one year = $110 as the future value. For two years, the future value should equal $121 (110 + (110*.10)). Okay, if my math is wrong, let me know. This is what I'm trying to get it to match to.
I have been able to modify the calculate_click function to compound the interest annually (it does it monthly now). Cool. I cannot get it to stop adding $100 annually. See my math above? I think that's the answer. My manipulation of the code yields $110 for the first year, $231 for the second year, etc. The $231 is incorrect cuz it adds an extra $100. See, this is a simple interest calculator I can't figure out! The original code is below that calculates the investment as a monthly investment as opposed to one-time. To avoid confusion, I did not include any of my modifications. But yeah. I know that the major culprit is how the "for" loop is being executed. I've highlighted where I think the code needs to be changed, but I haven't changed it here. Note the first function is a shortcut to execute getElementbyID.
The Code: var $ = function (id) { return document.getElementById(id); } var calculate_click = function () { var investment = parseFloat( $("investment").value ); var annualRate = parseFloat( $("rate").value ); var years = parseInt( $("years").value ); $("futureValue").value = ""; .....
The issue we are having is that he has a simple form that we are testing out that allows users to come on, click what they wish to order and submit. While they click what they wish to order, there is a text field in the bottom which updates with the price of their order. This script he found online and implemented without a problem.Though we noticed when this form was submitted, the email would take the name of the input and the value and place them next to one another.So for example if the user clicks the first bread with the value 1.99 then the email would show "Bread=1.99" and as we wished to use radio boxes so the user can only pick one, we need a way to read off the bread name.
We thought the easiest route would be to use javascript to take the selected value, store it with a variable and then run an if statement through the value and when it found the answer, we could display the name of the bread in a seperate field below the prices or hidden, as long as it appears within the email.I know it can be done as some examples online look similar to what we were trying to achieve but our ability to do so is non-existant.Is there a simple easy way to do this or could you direct me to a location which would take me through it step by step.
I'm building an online auction system. Each participant will be allowed to post one bid per minute for about 3 hours. Each person's "bid history" must remain visible to him during the entire auction in a scrollable list, and this list must be sorted from high to low bid. These auctions will have upwards of 10,000 bidders and the server will be seriously stressed in dealing with so many bidders posting another new bid every minute. Therefore I want to alleviate any additional stress on the server by storing and sorting each bidder's "bid history" in his own browser -- perhaps in a cookie or maybe there is a better javascript-based data storage container available for this purpose ... ?
This seems like a natural application for javascript because of the fact that only the individual bidder needs to see his own list of submitted bids -- sorted from high to low -- and I'm hoping that javascript can be employed to do this.
1- A bidder enters his bid into a form (example 12345.67) and posts the form to the server; 2- Javascript grabs the posted value and appends it to the cookie or whatever container is storing the bids in the browser; 3- Javascript re-sorts the values and displays them again, perhaps in an iFrame or maybe in another kind of scrolling list on the main page.
Note that these bids will NOT be placed in ascending or descending order (this auction is different from most) and this means the values must be re-sorted each time a new value is posted -- so they always appear sorted from high to low in the list.
need urgent help with javascript arrays. I need to store the checked value of the radiobutton into an array and then display the result from that array.I have created an empty array to store the input from the textbox of the form using the JS insert() function and then used show() function to display the result... but I am unable to display which option the user has selected from the radiobutton.if you look at it in the browser, and type in a name in the name textbox and click submit....it displays the result (which was stored in the inputarray) but the radiobutton doesnt work...gives.."undefined" and should give either Male or Female, depending on what the user selects.
I am making a form using HTML and java where you enter a number and it uses an equation then spits out another number. My problem is I want to split the number you put into the form and add it up. Example You enter"457829"Press "convert"And the first step I want it to do is"4+5+7+8+2+9=sumA"Then"sumA/8"So far I can only do the sumA/8 if I manually add up the numbers then place the sum in the form, here's the code:
I use the following to verify that a user has entered a number between 0 and 99 in a form:
It seems to work fine in all browser / machine combos except Firefox on a Mac, when entering 0 returns false (I don't know if entering other numbers also returns false.)
function check_email(mailstring) { valid = "1234567890qwertyuiop[]asdfghjklzxcvbnm.@-_QWERTYUIOPASDFGHJKLZXCVBNM"; for(i=0; i < mailstring.length ;i++)
[Code]....
at the moment its checks that someting has been enetered in all these fields,
what would be the best way to check that the email or phone nummber had been entered?? will not send if nothing enetered, but will send if one or both have been enetered?
<script type="text/javascript"> function HTMLEncode( text ) { text = text.replace(/&/g, "&") ; text = text.replace(/"/g, """) ; text = text.replace(/</g, "<") ; text = text.replace(/>/g, ">") ; text = text.replace(/'/g, "'") ; return text ; } </script>
Now i want to store the content of 'text' in a php string. Is that possible?
I tried and tried for so long to get this to work, but I just can't.
Here's what I did:
var testvar = document.getElementById('example').style.color; alert(testvar);
Not only would the alert come up empty each time, but IE reports that "testvar" is undefined. Why isn't it working? And if I'm going about it the wrong way, how can I store an element's style info, such as font colour like in this example, as a variable?
I was wondering if someone could help me on a problem I have been having. In my code my function is supposed to take the elements of the form and it checks to see if it is checked or not. After that it would store it in the variable checkbox. However when I test it out it will not store it in the variable. For example if I picked sleep/ standby checkbox and hit submit it will show as 06 instead of just 6. Don't know what I am doing wrong. Here is my [code]...
'm thinking that I have to learn how to work with cookies to do this but I was wondering if there was a variable type that might instead.. I have the following little test script...it works but only the first way...if I wanted to make this work both ways how would I go about it? I'm trying to figure out a way to create one of the little +/- buttons that can show and hide content.
I need to write a script that parses a web page for a given delimiter and then stores the following 50 characters as a variable. I wrote the following php script:
The delimiter is always going to be constant, however the succeeding characters will be different each and every time. I need to write this in Javascript because it is hosted on my server, and ran by users who post on my brothers message board (which is hosted elsewhere). Since Php is server side I always get "guest" as a value rather than the random string of characters like it should be.
When a person signs up for my website it first adds them to my external email list and then to my MySQL database.In order to do this you have to pass the information of the form to the next page where you can "display" it. Nothing except this display function seems to work.So what I am trying to do is take what is outputted by this display button and store it in a javascript variable. Then transfer this variable to a form which will auto submit and start the PHP registration pulling the output of the script, right now I can either get an undefined or the entire HTML code. Is there another option?Here is my code:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd" >
I'm just learning javascript and am editing a calculator form that will calculate square footage and write to a form text field. I have another form filed that I would like to display a number based a series of if else statements. ex: if square footage > 2761 then display 5.0., if square footage > 2521 then display 4.5. etc.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<HTML> <HEAD><TITLE>Size Calculator</TITLE> <SCRIPT LANGUAGE="JavaScript"> function CalculateSum(Atext, Btext, form){ var A = parseFloat(Atext); var B = parseFloat(Btext); form.Footage.value = A * B; form.Size.value = 21; }
/* ClearForm: this function has 1 argument: form. It clears the input and answer fields on the form. It needs to know the names of the INPUT elements in order to do this. */
just a very basic question. Have a div (id - photos) with multiple images. 1) Does this select them all? $('#photos img') 2)If so, how can i capture this information? Like so -> var bunchOfStuff = ($('#photos img')); and 3) if so, why can't i do something like alert(bunchOfStuff.length)into code tags...
I'm trying to embed a lot of html code into a javascript variable. How do I do that without getting error?
I kinda think that it has something to do with the escape quotation plus x, which I need so that the id won't duplicate.
//add new form //update cached steps in the wizard with a new step (adds one first) $(".addcar").live(click,function(){ //step 2 vehicle information content
I have a simple calculator here that takes the number of songs from the input text box and multiplies it by 500 and then tells you the total. I am doing this on a simple web page for a project for college. I know document.write overwrites my entire page to print the result but I would like to keep the page and design that I have made and to print the result on the same paragraph as where the script and text box are.
I'm trying to display the same image several times using javascript. It can range anywhere from 0 to about 50. I'll also have its' location determined by the user click and each image will timeout after a short period of time. I figure i'll have to create a new object for each image that is added and remove it after it times out, but my problem is I dont know how to tell the HTML code inside the <body> tag to display the same image for each click I make.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="content-type" content="text/html; charset=utf-8"/> <title></title> <script type="text/javascript"> function TextScroll(scrollname, div_name, up_name, down_name, top_name){ [Code]...
When I use mouse wheel in Firefox to scroll contents of the DIV, memory usage in Firefox goes through the roof. Code above is a fully working page, if anyone would like to see what's up, just load it up, and start moving your mouse wheel in the area with text. You don't actually have to scroll the text, just moving the wheel back and forth in that DIV will do. Memory usage will start going up quite fast, and after you stop moving the wheel, it will finally come down a bit after a short while. I've highlighted in red the line where mousewheel event is registered for Firefox. I'm not sure if it's really a problem, but since Opera and IE don't have any strange memory usage, and Firefox does, maybe I did something wrong. In everyday use it shouldn't matter [don't expect to have kilometers of content to scroll], but anyway, it is a bit unsettling.
I need to write a program that asks for 3 different numbers (prompt boxes) and determine which number entered was the highest and the 2nd highest. I know what to do for the input and output but I don't know what to do during the processing.
