I'm a JS beginner and I find looping through arrays with for/in is very easy. Yet I find lots of code examples where array length is used instead of for/in and I'm thinking to myself, why do it this (somewhat) hard(er) way?
View 11 RepliesI have a list of inputs
<div id="divID">
<input title="foo" type="text">
<input title="bar" type="text">
</div>
Then I'm trying to use jQuery to cycle through each input and ascribe ".attr("value") to each respective <input>. So far I've been using something along these lines:
var input = $('#divID input')
input.each(function(i) {
var title = input[i].attr("title");
input[i].attr("value", title);
}
If I remove the "[i]", it fills in every box with the title of the first <input>. If I leave it there, it fills in the first input, and then upon looping, says input[i].attr is not a function. So, if I type console.log(input[1]), firebug returns the correct <input> tag, but as soon as I add the .attr(); function, it blows up.
1. I have this list of 3 products/items that is created and displayed automatically through a for-loop. By changing the number in this loop, I can either add or subtract items of this list. More and more items are supposed to be added to list on a regular basis.
2. For each item, a number of customer-comments should be displayed and looped. I accomplish this using Arrays, where I can easily add new comments for each individual item to the loop.
3. Each item may have a different number of comments.
My goal is to have a system that effeciently allows me to add new comments at a minimum effort from my part.The comments loops fine, as long as I only choose to loop them for one item at the time. As soon as I try loop comments for two or more items at once, trouble ensue.
Below is my code:
Code:
<SCRIPT LANGUAGE="JavaScript"><!--
//SBC verdicts
verds_sbc = new Array(new Array("Great Game!","Good game!","I love this!"),new Array("AVGN","CurlysWorldof SOftware","ANGRY JOE"),new Array("www.cinemassacre.com","www.curlyswordsofsoftware.com","www.angryjoe.com"));
[code].....
There's no native linked list implementation in JS. I'm wondering if it would be worth it to implement one.
I'm using a lot of insertions and deletions with arrays of around length 5. How fast are insertions and deletions in JS native arrays compared to an optimized (but not native) linked list implementation in this situation? How about arrays of length 10?
is this correct
var mid = math.floor((0 + array.length)/2)
from here you could use array.slice to divide the array into two equal sized arrays?
If got problem with .each looping in jquery. im am trying to make a animation with jQuery. And i want to switch between three quotes of the array. and now it only works for the first quote of the array.
[Code]...
Well let's say i have a bunch of div tags with name attribute 'hello'
<div name='hello'></div>
<div name='hello'></div>
<div name='hello'></div>
I want to use JavaScript so that i can look through the array of these div objects.
var helloDivs = document.getElementByName('hello');
var len = helloDivs.length;
.....
So, it works for all the recent version of browsers but not for IE6. There is still about a 10% market share who are still using IE6. What is the workaround for this browser support?
If i were to print the variable len in IE6 says that is 0 and if i print helloDivs, it says it is an object as if helloDivs is a variable that contains an object but not an array of objects.
I have an associative array that I need to loop through, allbills,
however, each element in this array requires processing by the user and
I need to capture the users actions on the element and then return to
the next element in the list but suspend looping until I have the users
desired action...
For example,
for(mybill in allbills)
{
GetWhatToDo(mybill); // gets the information about what user wants to
do with the currentBill
}
The problem is that the function "GetWhatToDo" doesn't "block" so the
loop completes without waiting for the users input from GetWhatToDo...
So, my thought was I need to design things more 'event-driven' and
handle things like so:
function handleABill() {
mybill=GetNextBill();
GetWhatToDo(mybill);
}
A "Next" button inside the popup generated by GetWhatToDo will have an
onclick event that calls handleABill again...
The problem is that I can't figure out how to write GetNextBill so that
it maintains the state of the loop through 'allbills', especially since
'allbills' is an associative array and I can't keep track of the array
index. The only thing I can think of is to initialize a regular array
from the associative array and keep track of the index number.
Is it possible to search an array without looping through all the elements?
hoping for something like this;
myarray.exists("one")
which may return the element number or a true or false depending if the element being searched exists.
<SCRIPT LANGUAGE = "JAVASCRIPT">
var contestantNamesArray = ['Tom and Nazia', 'Pat and Dan', 'Sandra and Kofi', 'Ian and Adele', 'Paul and Costas'];
var judgesPointsArray = [2,1,5,4,3];
[Code]....
Basically i need it to loop though the array and find who has the highest points / if more than one have the same points so i dance off is required.
Is there any function or property for finding out the size of the first (or for that matter any) dimension of a multidimensional array?EDIT:There seems to be no such functionality, I found a solution that does not require it. If anyone is reading this for the same reason; it needs to be scripted.
View 2 Replies View RelatedI don' t know what I'm missing here..
$("div#carousel a").each(function(i) {
$(this).click(function(e) {
e.preventDefault();
console.log(myArray[i]);
});
});
it doesn't loop, it always prints the first item in the array (there are 18 <a>'s inside div#carousel, and 18 items in the array...)
I have an image sitting in a <td> tag, and I want the image to change every 5 seconds. I have a total of 3 images that I need to cycle, and I need it to go back to image1 after displaying image3 for 5 seconds.
I want to call the changeAd() function from the setInterval method within the startAdPAge() function because I am going to be adding more statements to the startAdPage() function, so the body onload event will call the startAdPage() function, which will in turn, call all the other functions.
I was using an if/else statement in the changeAd(), but that only changed between image1 and image2, so i am trying this array, but now it is not changing at all.
[Code]...
The problem is that it keeps returning a value of 0 every loop. When tested in Internet Explorer, FireFox and Google Chrome, it works just fine, returning values as it should (in this case the values of 32, 36, 35, 36). However, like i said, Safri returns 0, 0, 0, 0.
Crazy thing is, before it calls the checkArray() function, i check to make sure its sending the correct number and it does, so its something to do with the .length part since i did a check on that and that's where its coming up with the 0's.
var aryItems = new Array();
function add2Array(theName){aryItems[aryItems.length] = theName;}
function checkArray(theName){
for ( var z=0, len = aryItems.length; z < len; ++z ){
[Code].....
Ok the setup is basically this. The user selects a option in a drop down field, whatever they select through javscript additional records are populated in a second select field. This second select field allows for multiple selections, however I am submitting the form to a php script and I want to capture the multiple selections in the second select field. To do that for php I need to turn the field into an array so I have to add the brackets, [], to the name of the select field.
In php you can name the field like so:
Code:
<select name="fld[]" size="1">
The problem is in the js function when I give it a field name with [] the script doesnt work. Here is the js function:
Code:
function channelform(select_value) {
IntPath = document.channel_form.cid[]
TheOptions = IntPath.options.length
[Code]..
You can see the [] for the cid field name. Whenever I add that to the field name the js script is broken. How do I get it to work so that I can pass an array to php when the form submits?
I'm wondering if anyone would be most kind as to give me a few pointers on the subject of arrays! I'm trying to create an array of an unspecified length, the length is based on the result of another task that is performed in my code:
why I get an array containing [xml, xml]
Code:
str = 'index.xml'
re = RegExp( /([^s./]+)$/ ) ;
str.match(re) // -> [xml, xml]
I only need xml, not an array, and especially not [xml, xml]
Update: thnx mrhoo, thats clear now!
I have a function that requires the ability to count the number of entries in an array.
I'm using the following to call my function inside an input tag:
Here is the javascript:
And when errors.length is alerted, it outputs 0. I can only figure that there is an issue when using custom named keys in an array, since this works when I use only integers, however, I have the need to use a custom key index as shown.
why I get this error when i have one radio button in the array with a length size of one and i = 0?
]document.radioForm.Radio[i] is undefined
Line 25
Here's the code
ln = document.radioForm.Radio.length
if(isNaN(ln)){
ln = 1[code].....
I've been given two arrays:
arr1 = [1,8,9,12]
arr2 = [2,3,10,11,13]
My task was to merge the two arrays into a third array. Done, no problem, merged then sorted a new array. I understand there is a way to merge the two without using "merge" then "sort" functions. My reference material doesn't go into it, and I can't find an example of how this would work. I think there would be a way to do it using a for loop and then "push", but I could be way off.
Can anyone tell me how they could see merging two without using the merge then sort? And what would be the advantage to doing it this alternate way as opposed to using merge? Is there a case where it would be preferable? I'm so new at this that I can't fathom doing anything other than merge.
(the "code" below is pseudo code, just to get the idea across)
Here's what I currently have:
var bill = new array[20];
var sam = new array[20];
var nancy = new array[20];
var Oscar = new array[20];
I'm assigning objects to them (ie Oscar[5] = new objLabel() This seems like a kluge, however. Here's what I'd like (again, pseudo-code)
var Objects = {bill:null; sam:null; nancy:null; Oscar:null};
var theObject = new Array of Objects[20];
// yes: i know that's wrong... and that's the part I'm having trouble with
so that I can do something like:
[Code]....
Just seems to me that keeping a single array of multiple objects is likely to be less error-prone than multiple arrays of single objects... But I don't have the syntax right... or can it be done in JS? If it's doable, would someone be kind enough to show me how to declare and access that example?
I've got an array of names, and one ID. I need to run an ajax call using the ID and each lastname, until I get a successful hit on the ajax call. I can't quite figure out how to determine if the function that runs the ajax call has succeeded or not, it always returns false for me... Here's the code for the loop:
[Code]...
I was having some trouble with 2D arrays (or array of arrays). Essentially, the array has 100 rows, with two columns. The first column of every row holds a name, and the second holds a sales amount. With the use of a do while loop, the user can continuously add up to 100 names and sales amounts. After all the information the user wishes to add is stored into the 2D array I'm attempting to pass that very same 2D array as a parameter to a function called printRow as can be seen in the code below: Note: the function call and the actual function are found in two separate javascripts.
[Code]...
I have a choice when creating a new API that I would like other peoples opinions on. Do I use a single Array or Multiple arrays such as: array[1][1] = "ID[56]NAME[Hello World]START[10]"; OR
ID[1][1] = 56;
Name[1][1] = "Hello World";
Start[1][1] = 20;
The API is used for animations so is very heavy work, but would using around 15 multidimensional arrays be too much and a single one be preferable???
I'm have some javascript objects with arrays that should be transferred as php array.Its posted by ajax httpRequest.How can I return php array, from the javascript?
View 4 Replies View Relatedi have a form with arrays, I want to sum different arrays and display the total in a array field in the form itself.i have this code
<form>
do {
$x++;
[code]....