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POMoving static variables and related classes into a loop
 

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    <p>I have some code in a Javascript file that was fixed at 3 elements.</p> <p>I am now pulling items from a database so I need to convert it into a loop to create the right amount of elements.</p> <p>I can't seem to figure out how to write my dynamic variables properly.</p> <p>This is what I originally had:</p> <pre><code>var block0=$('#block0').offset().top; var block1=$('#block1').offset().top; var block2=$('#block2').offset().top; $(window).scroll(function(){ windowScroll=$(window).scrollTop(); // conditional first item if(windowScroll &gt; block0){ $('.arrow').show(); $('.static_ele').hide(); $('#block_1').show(); $('#block_1').css({'position':'fixed','padding-top':0}); $('.arrow a').removeClass('upward'); }else{ $('.arrow a').attr('href','#block1'); } // all central items if(windowScroll &gt; block1-200){ $('.static_ele').hide(); $('#block_2').show(); $('#block_2').css('position','fixed'); $('.arrow a').attr('href','#block2'); $('.arrow a').removeClass('upward'); } // conditional last item if(windowScroll &gt; block2-200){ $('.static_ele').hide(); $('#block_3').show(); $('#block_3').css('position','fixed'); $('.arrow a').attr('href','#arrow1'); $('.arrow a').addClass('upward'); } }) </code></pre> <p>This is where I have now got to:</p> <pre><code>var i=1; var len={{collection.products_count}}; $(window).scroll(function(){ windowScroll=$(window).scrollTop(); // first block if(windowScroll &gt; $('#block0').offset().top){ $('.arrow').show(); $('.static_ele').hide(); $('#block_1').show(); $('#block_1').css({'position':'fixed','padding-top':0}); $('.arrow a').removeClass('upward'); }else{ $('.arrow a').attr('href','#block1'); } // central blocks for (i; i&lt;len-2; i++) { if(windowScroll &gt; $('#block'+i).offset().top-200){ $('.static_ele').hide(); $('#block_'+(i+1)).show(); $('#block_'+(i+1)).css('position','fixed'); $('.arrow a').attr('href','#block'+(i+1)); $('.arrow a').removeClass('upward'); } } // end for loop // last block if(windowScroll &gt; $('#block'+(len-1)).offset().top-200){ $('.static_ele').hide(); $('#block_'+len).show(); $('#block_'+len).css('position','fixed'); $('.arrow a').attr('href','#arrow1'); $('.arrow a').addClass('upward'); } }) // end window scroll function </code></pre> <p>Which still is not working. If I take the items out of the four loop and manually enter them it works. So if I replace the For loop above with</p> <pre><code>// central blocks if(windowScroll &gt; $('#block1').offset().top-200){ $('.static_ele').hide(); $('#block_2').show(); $('#block_2').css('position','fixed'); $('.arrow a').attr('href','#block2'); $('.arrow a').removeClass('upward'); } if(windowScroll &gt; $('#block2').offset().top-200){ $('.static_ele').hide(); $('#block_3').show(); $('#block_3').css('position','fixed'); $('.arrow a').attr('href','#block3'); $('.arrow a').removeClass('upward'); } </code></pre> <p>It then works perfectly for a scenario with 4 items. So I think it is because all cases need to be accessible from within the windowScroll function which they aren't when contained within a for loop?? Is there another way to code this?</p> <p>(A bit of background - this script is to hide and show divs as a user scrolls down a page. An arrow at the bottom of the page is available to click to next slide. When you reach the bottom the arrow turns up and takes you back to the top.) </p>
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    1. COPost your html, you should give an `id` to the container which wrap the elements, and replace `block0` to `$('#'+containerid).offset().top`.
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