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POjQuery script ruined by variable assuming value 0 sometimes
 

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  1. POjQuery script ruined by variable assuming value 0 sometimes
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    <p>My problem is that sometimes my script doesn't work. I know the problem but I can't solve it. Below, my script.</p> <pre><code>$(document).ready(function(){ /* Cria UL e popula de LI de acordo com o HTML do controle da Vtex*/ $('.slider-nav').after('&lt;ul class="slider-ul"&gt;&lt;/ul&gt;'); /* clona elementos se tiver menos que 3 */ var tamArray = $('#slider .box-banner').length; if (tamArray &lt; 3) { for (ij=1; ij&lt;=(3-tamArray); ij++){ $('#slider .box-banner:last').clone().appendTo('#slider'); } } $('#slider .box-banner').each(function(){ href = $(this).find('a').attr('href'); title = $(this).find('a').attr('title'); src = $(this).find('img').attr('src'); $('ul.slider-ul').append('&lt;li&gt;&lt;a href="'+href+'" title="'+title+'"&gt;&lt;img src="'+src+'"/&gt;&lt;/a&gt;&lt;/li&gt;'); }); $('.slider-ul').wrap('&lt;div class="slider-ul-wrapper" /&gt;'); /* Calcula offset do left pra colocar um banner no meio */ var tamJanela = $(window).width(); var tamImagem = $('#slider .slider-ul:first img').width(); var leftOffset = tamImagem - (tamJanela-tamImagem)/2; $('.slider-ul').css('left',-leftOffset); /* Clique em #nav-dir */ $('#nav-dir').click(function(){ $('.slider-ul li:last').clone().addClass('clone').insertBefore('.slider-ul li:first'); var soma = -(leftOffset)-tamImagem; $('.slider-ul').css('left',soma); $('.slider-ul').animate({ left: '+='+tamImagem+'' //left: "'+="+tamImagem+"'" }, 1000, 'swing', function(){ $('.slider-ul .clone').remove(); $('.slider-ul li:last').insertBefore('.slider-ul li:first'); $('.slider-ul').removeAttr('style'); $('.slider-ul').css('left',-leftOffset); }); }); /* Clique em #nav-esq */ $('#nav-esq').click(function(){ $('.slider-ul li:first').clone().addClass('clone').insertAfter('.slider-ul li:last'); //var soma = -tamImagem; //$('.slider-ul').css('left',soma); $('.slider-ul').animate({ left: '-='+tamImagem+'' //left: "'+="+tamImagem+"'" }, 1000, 'swing', function(){ $('.slider-ul .clone').remove(); $('.slider-ul li:first').insertAfter('.slider-ul li:last'); $('.slider-ul').removeAttr('style'); $('.slider-ul').css('left',-leftOffset); }); }); }); </code></pre> <p>And the relevant HTML:</p> <pre><code>&lt;div class="slider-ul-wrapper"&gt; &lt;ul class="slider-ul" style="left: 671.5px"&gt; &lt;li&gt; &lt;a href="undefined" title&gt; &lt;img src="...." /&gt; &lt;/a&gt; &lt;/li&gt; . . . &lt;/ul&gt; &lt;/div&gt; </code></pre> <p>The problem happens when <code>tamImagem</code> evaluates the <code>img</code> element width to 0. It then passes the wrong value to <code>leftOffset</code> value and ruins the expressions. Sometimes, after several refreshes, it works. Sometimes it doesn't. What is the problem? Does it return 0 because the element isn't ready? But why wouldn't it be ready?</p> <p>Also, there is some sort of Ajax request running on the background that I don't quite understand. Every image on the page receives a <code>complete</code> class when the requests are done. Should I wait until the <code>img</code> element is <code>complete</code>? How do I do that?</p> <p>Thanks a lot!</p>
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