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PO
 

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    <p>There are multiple problems in your code.</p> <p>First of all you use the <code>[i]</code> instead of <code>i</code> for string catenation <code>"block" + [i]</code>, when all you should write is <code>"block" + i</code>. <code>[i]</code> creates a new array of size 1; this array is soon coerced into a string, which happily is the same as i.toString() in this case; that value is then concatenated to a string.</p> <p>Secondly: instead of using IDs, you want to set a common class for all the blocks so that you can select them efficiently. Then you want to use JQuery each to loop through them instead of for.</p> <p>Thirdly - your code "setting block variables" does 1 thing only</p> <pre><code>for (j; j&lt;len; j++) { // set block vars var tem=block[j]; tem=$('#block'+[j]).offset().top; } </code></pre> <p>is equivalent to</p> <pre><code>j = len; var tem = $('#block' + (len - 1)).offset().top; </code></pre> <p>That is all the side effects it has - it does not set any "block variables".</p> <p>Instead of <code>else { if() { } }</code> write <code>else if () { }</code>.</p> <p>Move all "loop invariants" out of the for loop altogether (that is <code>$('.static_ele').hide();</code> for example is run <code>len</code> times instead of only 1.</p> <p>Lastly do not use for loop with <em>only</em> if loop variable contained within it - move the first if and last if out of the loop, and modify the for loop to run from second to second-last, to avoid the dreaded "for-case" paradigm.</p> <p>After you write your code according to these guidances then it becomes more apparent what it is trying to do and actually answering your questions would become possible</p>
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    1. POMoving static variables and related classes into a loop
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    1. USAntti Haapala
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    1. COThanks so much for your time on this. I'm a newbie so these tips are really just what I needed.
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    2. COI've updated the original question above with my new code (plus some extra notes). Works well if there are 3 items, but not for four. However, if I manually write the four items it works fine. I think the windowScroll function needs to access all options at once. Is there another way of stating the if statements outside of a for loop?
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