I now multi-dimensional array in javascript is a bit silly. But in my program I have to use it. I want to declare a dynamic 3 columns and m-rows array using javascript and then in a loop i need to insert some element to that array. finally i want to display that array.
var x = new Array();
for (var y=0; y<=counter; y++) {
x[y] = new Array (3);
x[y][0]='a';
x[y][1]='b';
x[y][2]='c';
}
your help is highly appreciated ...
arrays grow as needed and so there is no point in declaring the length of the array. what you started with is fine. http://books.google.ca/books?id=4RChxt67lvwC&pg=PA141&lpg=PA141&dq=JS+array+grow+as+needed?&source=bl&ots=tgY8BlGXm8&sig=_3jcH1LTmYi9QiXxn9pHROpbN1s&hl=en&sa=X&ei=7v60T_XwA4ThggfGuoEX&ved=0CEoQ6AEwAQ#v=onepage&q=JS%20array%20grow%20as%20needed%3F&f=false
http://www.codingforums.com/showthread.php?t=5198
just a heads up it will create an array that is 1 bigger then counter. this is b/c in your for loop you have y<=counter and y starting at 0. if you want the length to be counter change it to
y<counter
in order to display the array you might want to consider a for nested loop.
JS
for(var i=0; i<x.length; i++)
for (var j=0; j<3; j++)
alert(x[i][j]);
where x is the reference to the array. if you want to print the entire array at once consider creating a string from the elements in the array and print that
function displayArray(x){
var stringArray='';
for(var i=0; i<x.length; i++)
for (var j=0; j<3; j++)
stringArray+= x[i][j];
alert(stringArray);
}
Something like this?
var x = [
[
[1, 2, 3],
[4,5,6]
],
[
[7, 8, 9]
]
];
alert(x[0][1][2]);
This is one reason why JavaScript's variable syntax isn't always what it's cracked up to be. Compare to Java:
String[][][] x = new String[5][5][5];
Something like this maybe?
var sDataArray=MultiDimensionalArray(7,2);
alert(sDataArray[0][0]);
function MultiDimensionalArray(iRows,iCols)
{
var i;
var j;
var a = new Array(iRows);
for (i=0; i < iRows; i++)
{
a[i] = new Array(iCols);
for (j=0; j < iCols; j++)
{
a[i][j] = "";
}
}
return(a);
}
Being dynamic in rows maybe you want a list of arrays? You can also do a method to add a line, and increase the array size.
try something like this..
var cols = 3;
var rows = 5;
createArray(cols,rows);
function createArray(cols,rows) {
var newArray = [];
for(i=0;i<cols;i++) {
newArray[i] = [];
for(j=0;j<rows;j++) {
newArray[i][j] = "["+i+"]"+"["+j+"]";
}
}
return newArray;
}
