Processing array data

[CharlieLaw]

I currently have a list which I grab all of the links within it using document.getElementById(section).getElementsByTagName("a"). Every second link is a nested list element and I want to grab the top level list item and its sibling and place it in a left column, then take the next list item and its sibling and place it in the right column, this pattern would continue until their are no more list items.

<li><a href="#">Link 1</a>
<ul><li><a href="#">Link 1a</a></li></ul>
</li>
<li><a href="#">Link 2</a>
<ul><li><a href="#">Link 2a</a></li></ul>
</li>
<li><a href="#">Link 3</a>
<ul><li><a href="#">Link 3a</a></li></ul>
</li>

So using the above as an example the left column would read link1, link1a, link3, link3a and the right column would read link2, link2a.

I currently have it set up using a long and inflexible if statement
if (allLinks == allLinks[1] || allLinks == allLinks[2]
|| allLinks == allLinks[5] || allLinks == allLinks[6]
|| allLinks == allLinks[9] || allLinks == allLinks[10]
|| allLinks == allLinks[13] || allLinks == allLinks[14]) {
some code......
}

Is it possible to capture 1 & 2, 5 & 6, 7 & 8, 11 & 12 items from an array, Or have I approached this all wrong? The solution has to be flexible enough that it does not matter how many links are within the list which is why I dont like the current if condition as potentially I would have to alter this when a large number of links were grabbed.

Cheers
Charlie.

 

[trollacious]

Why not check for i instead of the contents of the array?

switch (i)
  {
  case 1:
  case 2:
  case 5:
  case 6:
  case 9:
  case 10:
  case 13:
  case 14:
    {
    //do something here
    break;
    }
  }

Lee

 

[adam0101]

This will split the "allLinks" array into two arrays: "left" and "right" using the splice method.

var left = allLinks;
var right = [];
for(var i=left.length-2; i>=0; i=i-4){
  right.splice(0,0,left.splice(i,2));
}

Adam

http://adameslinger.blogspot.com/