Iterate Array And Grab X Numbers Based On Pointer?
Jul 1, 2009
I'm trying to figure out how to do this via Javascript.
Lets say I have an array like so:
var myArray = [11, 33, 44, 23, 32, 43];
var finalArray = new Array();
And I have the following variables
var lastNumber = 33;
var getNext = 2;
I want to use the lastNumber for a starting point in the array and then based on getNext, grab the next x numbers that getNext specifies and shove into finalArray.
That case moves forward in the array.
Second case would be the opposite, get the previous x numbers based on getPrevious in the array. So I'd start at lastNumber and then grab x numbers before it based on getPrevious.
var lastNumber = 33;
var getPrevious = 2;
I'm not sure if you can traverse backwards in JavaScript. But more importantly I'm not sure how to point to lets say 33. How can I do myArray[1] essentially based on I'm pointing to 33 and then how can I grab the next x in myArray ?
I know that using for in loop to iterate over array elements is a bad idea but I have a situation where it is tempting me to use it. I have a two dimensional sparse array say "arr" which will have length to be some 50 but will have some elements like arr[1], arr[10], arr[23] at random locations. Each of these elements is again an array (since it is two dimensional) say arr[1][30], arr[1][24] & so on for arr[10 & 23] also. Currently I've coded it like this:
for (var i = 0; i < arr.length; i++) { for (var j = 0; j < arr[i].length; j++) { if (arr[i] && arr[i][j]) { // do stuff with arr[i][j] } } }
but i am tempted to do following
for (var i in arr) { if (!arr.hasOwnProperty(i)) { continue; } for (var j in arr[i]) { if (arr[i].hasOwnProperty(j)) { // do stuff with arr[i][j] } } }
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I then need to store these positions so i can use them elsewhere, and i'm pretty sure i need to use charAt() but i think my syntax may be wrong - contained in the for loop.
var yourDestination = readTheDestination(); var title = "<B>" + "You asked about Flights to " + "<B>" + "<BR>"; var flightInfo; var solution = "";
So i've written up the code to do a lightbox esque overlay image gallery. everything is working smooth and fine. The only concern is that I have the following:
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obviously "galVariable" would be undefined... as i'm trying to get "_gallery2.images" but trying to use "galVariable" to point to "_gallery2"
I'm familiar with solving a problem like this in PHP, not so much javascript. is there a JS function that can be used to ensure that it's using whatever "galVariable" equals to, and then that array's content is? Or is there a different way to go on about this.
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Code so far: <html> <title>Homework 5</title> <body> <script> var num = new Array(); var x = 0; var lastnum; for (x = 0; x < 3; x++){ num[x] = window.prompt("Please enter a number between 100-999:"); if((num[x] < 100) || (num[x] > 999)){ lastnum = window.prompt("Enter your last number:"); for (x = 0; x < 1; x++){ num.sort(); window.alert(num); } break; }} window.alert("DONE"); </script> </body>
I want to get the sum of all numbers in an text area irrespective of the spaces before between or after them. e.g. " 1 2 12 15 " =30
In the code below I can have multiple spaces or CR between numbers and it works giving me their sum But if i have a space before the first number or after the last number I get a NAN (
I am starting to learn javascript and have been trying to make a image gallery. I was hoping to take an array of src and create a link for each one which when clicked on changes the src of an already existing img.My question though is how would I make the buttons for the numbers.I feel like a loop would work for this but I just can't seem to figure it out. I don't know how far off I am in thinking that through a loop I could create functions with a name plus the i variable.And in each function there could be something like:
Code: document.images["destination"].src = images[i] That would then produce an <a> with the href equal to the function name + "i" with the title being "i" as well.
Am I way off? How would I execute that? A little explanation about my code. I am going to be using a loop to add the images that will vary in amount for each page that is why I have the push function just for this test. And the document.ready is because I've been using some jQuery.
I have a quick question with multiple array and random numbers. If i generate my random numbers in one array, how would i take a selection of those numbers and put them in another array?
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array 2: 34, 38, 40, 49
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I'm trying to create a 4 x 4 array filled with numbers input by the user. I then need to rotate the grid clockwise like I've shown below.
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
13 09 05 01 14 10 06 02 15 11 07 03 16 12 08 04
I made all numbers double digit just for show in the example so the table is easier to read. So far the code I have is just trying to create the array and fill with numbers from the user. This asks for a number once then doesn't display anything at all.
I'm trying to generate random numbers 0-8 to use to access array indices.[code]Every once in a while, I'm getting a -1 in my console log. I read on a site that this line:[code]will generate a number between 0 and 10 (so 1-9).How is -1 being generated?
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PHP Code:
json_data_object.i.name
That one would work, but then I have to chnge JSON string thta pulls data from DB and i cant really do that...So the question is how can I make 422 (numbers) works the same way as just string values in the array/object tree?
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Code: for ($i=0; $i<$lines.length; $i++) { if ($lines[$i].substr($lines[$i].length-1)=="=") { $lines[$i]=$lines[$i].substr(0,$lines[$i].length1)+$lines[$i+1]; $lines.splice($i+1,1); $i--; } }
I am trying to get all the div tags in my page into an array but only the tags with the ID "image**". Below is what I came up with but this doesn't seem to work, even after googling a bit I couldn't find any solution. I can't seem to come up with a solution.
function divs() { var divs = document.getElementsByTagName('div'); var ImageTags = []; for (i=0; document.getElementsByTagName('div').length; i++) {
