Subtract Using Random Arrays
Jun 12, 2006
Heres my most current code. I have it where, onClick on an image it calls this. and it works, but the hp keeps restarting, like they all minus from 100, instead of the number that prieviously minused from 100. For xp: 100-9=91, is the first, the second, 100-72=28 instead of 91-72. How do i fix
var myhp;
function takehits()
{
var dmg= new Array()
dmg[0]=9;
dmg[1]=11;
dmg[2]=15;
dmg[3]=21;
dmg[4]=29;
myhp=100;
var rndtake=Math.floor(Math.random()*5);
document.getElementById('health').innerHTML=myhp-dmg[rndtake];
}
I want to have it where, you have an aray, and u have a number value that you want the number value, to be subtracted by one of the numbers in the array. And u lets say the array has 5 choices. Code:
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May 29, 2007
Am i breaking any rules when I loop dates like
// Determine Memorial Day
intFlag = 0;
memDayHol = new Date (currentYear, 4, 31);
while (intFlag == 0) {
if (memDayHol.getDay() == 1) {intFlag =1;}
else {memDayHol = memDayHol - 1;}
}
I can find no docs that one can use the '+' operator directly on a date
object, and it assumes adding/subtracting a day(s). Is this deprecated
code?
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Mar 16, 2011
I am trying to change the script below from adding the values to subtracting without much luck.
Code:
<script type="text/javascript" language="javascript">
function autocalc(oText) {
if (isNaN(oText.value)) //filter input {
alert('Numbers only!');
oText.value = '';
} var field, val, oForm = oText.form, netincome = a = 0;
for (a; a < arguments.length; ++a) //loop through text elements {
field = arguments[a];
val = parseFloat(field.value); //get value
if (!isNaN(val)) //number? {
netincome += val; //accumulate
}}
oForm.netincome.value = netincome; //out
}
</script>
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Nov 10, 2010
I have the following function that will subtract n number of days from todays date. The problem is that it always returns the the wrong calculate date. The month is wrong.
see if you can spot my mistake:
Code:
function returnDate(ndays){
var dayOfTheWeek = now.getDay();
now.setTime(now.getTime() - nDays * 24 * 60 * 60 * 1000);
alert(now); // returns current date
alet(now.getYear() + "/"+now.getMonth()+"/"+now.getDate()) // returns new calculated date
}
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Jan 10, 2012
I have an image gallery where every image has an index number ("data-index"). How do I access that index number when the image is "current" and then add +1 when it's "next" or subtract -1 when it's "previous"? Below is part of my code.
[Code]...
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Oct 15, 2009
Take a variable...
var time = "12:00"
split it...
var hour=time.split(":");
...then add or subtract from the numeric value of hour[0] based on timezone.
EST = -5
PST = -8
What would be the best way of doing this?
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Apr 19, 2011
What Ive done is use local storage to set a value in my web app.
Then my next task was to write said value on my page (This took me hours but finally got it done).
My next task is using Setinterval(or what ever the correct way to solve my problem) to subtract a number (lets use "1" for this example) Every 5 seconds from the local storage value.So basically After I click the button. Value is set and displayed. After another button is click. Every 5 seconds the localstorage is subtraced by 1. I think the code im looking for is similar to this
Code:
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Jun 14, 2011
I have a calculator and using JQuery Calculator plug-in which Tally's up groups of field values using key up. I have a summary page which presents the user with over all expenditure. What I need to do is subtract the expenditure from income, populate a total field onclick of an <li>.
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Jan 11, 2012
I have been fighting a nutrition calculator and I finally have all the addition working. the problem is the subtract link is not working. (it works as a link but doesn't trigger my jquery).
var jM = jQuery.noConflict();
jM(document).ready(function(){
// Calculator behavior
//Addition Time!
jM(".add").click(function() {
//Create the Variables to Hold the Values for Nutrition Information.....
jM('.subtract').click(function() {
alert('test');
});
});
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Nov 5, 2009
I have created a PDF time sheet for work that automatically calculates the hours worked utilizing the below script:
topmostSubform.Page1.worked[0]::calculate - (FormCalc, client)
var amTime = 0
if (HasValue(amOut) and HasValue(amIn)) then
amTime = Time2Num(amOut.formattedValue, "h:MM A") - Time2Num(amIn.formattedValue, "h:MM A")- 1800000
endif
// compute total time in hours from the millisecond value
$.rawValue = Sum(amTime)/3600000
I discovered a problem; if the employee works less than 8 hours they may not take a lunch. I have it set to automatically subtract 30 minutes for lunch. How do I write it to only subtract 30 minutes if the work day is greater than 4 hours? I am new to java script and have NEVER programmed anything previously. I am working in Adobe LiveCycle Designer and what I have done so far was gleaned by reading the internet. So please, if you reply break it down Barney style.
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Jan 12, 2010
I neeed to subtract values from two text boxes and then show the difference into a html label.
Basically I need to enter times, like 10:00 and 12:00 and it calculate that the difference was 2 hours.
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Aug 31, 2011
I'm trying to use Javascript to have an array of images that load randomly AND work in a slideshow manner so change every 3 seconds (in a logical order). The code I have below presents a random image but how do I get them to continue from the random image and change to the next every 3 seconds?
<script language="JavaScript">
images = new Array(3);
images[0] = "<a href = 'photo1.html'><img src='images/photo1.jpg' alt='Photo 1'></a>";
images[1] = "<a href = 'photo2.html'><img src='images/photo2.jpg' alt='Photo 2'></a>";
images[2] = "<a href = 'photo3.html'><img src='images/photo3.jpg' alt='Photo 3'></a>";
[Code]...
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Aug 6, 2009
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:
<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'),
[Code]...
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Apr 18, 2011
For my website I would like to create a famous last words generator (randomized), and random page generator (within my site). What is the code for random quotes and random links?
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Mar 18, 2011
I'm making a form for my rural neighbors' electricity calculations. My main problem is getting the Previous and Current reading to subtract each other and post in the "kwh Used" column. My plan is to continue doing the calculations after I find that value. Here is the code thus far:
<head>
<title>Untitled Document</title>
<script language="javascript">
function calc()
{
preR= Number(document.Bill_cal.PrRe.value);
[Code]...
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Aug 27, 2011
I've been messing with this code to make a fade in animation with setTimout. The only thing is addition isn't working on the fade in. A subtraction on a negative works though. This seems strange to me.
changeit.style.opacity -= -0.01; works but when it's changed to changeit.style.opacity += 0.01; there's no fade in. It's the only thing I change. My intuition says to me it should work with addition, but maybe there's something I'm not understanding.
<html>
changeit.style.opacity -= -0.01; if this is set to changeit.style.opacity += 0.01; it doesn't work. What?
Of course this is all just for Firefox for now. If I put this in something useful I'll change it so it'll work in other browsers later.
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Dec 14, 2011
I am new to javascript but have been using java for quite a while. I am looking to make a random quote (out of ten possible quotes) appear in my h2 tag in a page i am working on. In java, i would make a random number generator, in javascript it looks like this:
Code:
var randomnumber=Math.floor(Math.random()*11)
Then make an if statement:
Code:
if randomnumber=1 {
var quote="Live long and prosper"
}
document.write(var quote); Could someone more experienced than me tell me if my code looks good and how would a go about getting "var quote" in my h2 tag?
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Jul 23, 2005
I've noticed that IE apparently has a horrible implementation of the
array object, since traversing one with as few as 1000 items it tends
to pop up a dialog informing the user that the script is taking too
long. I tried splitting the array into a 10x100 two-dimensional array
as well as changing the array to a linked list, but neither improved
the code's efficiency sufficiently. Can anyone suggest methods for
optimizing array efficiency, or some other workaround for yet another
one of Bill Gates' blunders?
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Jul 23, 2005
I have a web document created by a script and instead of going back to
the db I choose to either create an array to iterate through or xml to
parse through.
So, my question is: What are the trade offs between using an array to
load data from or an xml structure?
My array would look like:
myarray = [[],[],[],[]]
My xml like:
<xml>
<data>
<a></a><b></b>
</data>
</xml>
I would use js to iterate or getElementByTagName to find data. I am thinking the page would load faster using xml, and then the user may not even use that functionality. In all cases I have to load the array to memory.
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May 23, 2007
I am with XHTML and CSS as much do I have to learn in JavaScript programming. I’m just beginning to understand and modify the DOM and I ran into something that I couldn’t find a solution for after some extensive search. I have this function:
if(document.getElementById && document.createElement) {
function addflags() {
var children = document.getElementById('pagelist').childNodes;
for(var i = 0; i < children.length; i++) {
children[0].className = 'bulgaria'
children[1].className = 'england'
children[2].className = 'italy'
children[3].className = 'sweden'
}
}
window.
}
The XHTML is an unordered list with 4 list items and sub lists in those list items (plus links in each li) and I want to add a country flag (set as background image in the CSS) to the direct children of the ul (the first level list items).
Now I discovered that Firefox is only reacting to odd array numbers, i.e. children[1], 3, 5, and 7 (the even numbers have "no properties") while IE is applying the classes correctly(?) as intended above (0,1,2,3).
At which point did I go wrong? Sorry if this is a real stupid question but I’m pretty new in this field and my researches didn’t bring any acceptable results.
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Oct 5, 2005
Is what I'm doing the right approach to creating an array of arrays? I have an external datafile with several employees' records. They are stored in an array with each element of the array being the complete employee record, ie: name, date of hire, etc., etc. These attributes are delimited by a :. I'm trying to separate these attributes while keeping the original array intact. That way I can access these attributes and validate whether or not an instance of the employee object will occur. There are too many records to create this from the start, so I'm trying to implement a for loop to do it for me. This is what I tried: datafile is the name of the original array of employees. emp is the array I'm trying to create .
for(var i=0;i<datafile.length;i++){
var emp = datafile[i].split(":");
//document.writeln(emp.length+"<br>");
/document.writeln(datafile[i]+"<br>");
}
//document.writeln(datafile[0]+"<br>");
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Jul 23, 2005
How do I set this to "disabled":
<select name="awards[]" multiple size="6">
<option value="1">Award 1</option>
<option value="2">Award 2</option>
<option value="3">Award 3</option>
<option value="4">Award 4</option>
</select>
I don't know how many options there will be as they are fed from a DB.
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Nov 23, 2005
Anybody got any suggestions about using two arrays. First i need to
ask the user their name and if their require a seat between 1and 5 or
between 6 and 10. I need to assign this information in two arrays.
Any suggestions. I have been working on this so far.
<script type="text/javascript">
var theArray = new Array(10);
//var sizeOfArray = parseInt(prompt("How many items will the array
have?", ""));
for(i=0; i<10; i++)
{
theArray[i] = prompt( "Please enter your name");
}
for(i=0; i<theArray.length; i++)
{
document.writeln( "theArray[" + i + " ] = " + theArray[i] + "<br />");
}
</script>
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Sep 12, 2006
I want to make algorithms that take selections from arrays and put them together in new ways. here is a simple array I set up for notes of a piano keyboard: Code:
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Mar 6, 2007
Safari and FF seem to allow this:
var wiggy = "ABCD";
ch = wiggy[2]; // ch will contain the character 'C'
however my JS book seems to insist that I do this:
ch = wiggy.charAt(2);
and indeed doesn't appear to mention the first method at all.
Since for my particular purpose I want to treat the string as an array
of single characters, I prefer the first method rather than the second.
Is there any reason not to pursue this approach?
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Jul 20, 2005
Any neat way to copy a snapshot of one array to another?
A normal assignment results in the second array pointing to the first,
with changes to either array affecting both.
As a trivial example:
var a=new Array();
a[0]="zero";
var b=a;
b[1]="one";
alert("a="+a.join("*")+String.fromCharCode(10)+"b="+b.join("*"));
.... this results in a and b being identical two-element arrays.
Is there any easy way to set array (b) to be a copy of (a) BY VALUE -
ie using the contents of (a) as they were at the moment of assignment,
but leaving the two arrays separate so that subsequent changes to one
array does not affect the other?
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