jquery - if statement is visible is undefined -

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i'm trying id slide-1 has attr of displays block add class id pagecount-1 of active. i'm trying each slide indicator shown active. have:

<div id="slider">   <div class="sp active" id="slide-1" style="display: block"></div>   <div class="sp" id="slide-2" style="display: none"></div>   <div class="sp" id="slide-3" style="display: none"></div>   <div class="sp" id="slide-4" style="display: none"></div> </div>  <div id="page">   <div id="page_count-1" class="indicate"></div>   <div id="page_count-2" class="indicate"></div>   <div id="page_count-3" class="indicate"></div>   <div id="page_count-4" class="indicate"></div> </div>

jquery:

for (var = 1; <= 4; i++) {     if ($('#slide-' + i).is(':visible')) {         $('#page_count-' + i).addclass('active');     } }

console log keeps displaying undefined. if run .attr('display', 'block') makes active.

display css property, not attribute. try:

.css('display', 'block');

.attr() set attribute on element, instance:

<div id="some-div"></div>

would turn into:

<div id="some-div" data-foobar="barfoo"></div>

if run .attr() on this:

$("#some-div").attr("data-foobar", "barfoo");

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