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POJavascript execution timing - ensure synchronous flow, not just order of execution
 

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  1. POJavascript execution timing - ensure synchronous flow, not just order of execution
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    <p>I am working with JavaScript (Jquery) trying to run some operations in order. In my real code, I have a function I run on <code>.ready()</code> to initiate some variables. As part of this flow I read in some data from <em>local storage</em> to remove elements which were removed in a previous visit. The elements which I remove have a css transition class applied. When the page first loads, I do not want these animations to occur, so I require that the <code>&lt;body&gt;</code> element has the <code>class="fully-loaded"</code> applied in my CSS for transition to work. I am trying to add the <code>fully-loaded</code> class only after I know all of the additions and everything else is loaded. I have tried setting up multiple <code>.ready()</code> statements, using queues, etc. in order to control the order or execution. </p> <p>While I think I have things running in order, the initiation function does not seem to be complete before I run the script to add the <code>fully-loaded</code> class. I am pasting a mini version of my code which exhibits the same problem. <strong>My question is:</strong> How can I ensure that anything run as part of my initiation function <code>init()</code> complete before I run the <code>addClass</code> call?</p> <h2>HTML body:</h2> <pre><code>&lt;body&gt; &lt;section id="secA"&gt; &lt;p&gt;Sec A&lt;/p&gt; &lt;/section&gt; &lt;section id="secB"&gt; &lt;p&gt;Sec B&lt;/p&gt; &lt;/section&gt; &lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"&gt;&lt;/script&gt; &lt;script&gt; //$(document).ready( Tester.init() ); //$(document).ready( $("body").addClass('fully-loaded') ); //$(document).ready( Tester.init() ); $.when(Tester.init()).done(function(){ $("body").addClass('fully-loaded'); console.log("Desired Order: 4"); }); &lt;/script&gt; &lt;/body&gt; </code></pre> <h2>JavaScript in another file</h2> <pre><code>var Tester = (function() { function init() { initEvents(); } function initEvents(){ console.log("Desired Order: 1"); setTimeout( '$("#secA").remove(); console.log("Desired Order: 2");', 2000 ); console.log("Desired Order: 3"); } return { init : init }; })(); </code></pre> <h1>CSS Code</h1> <pre><code>section { width:200px; height:200px; position:absolute;} #secA { background-color:green; } #secB { background-color:red; } section:nth-of-type(1) { top: 0; left: 0; } section:nth-of-type(2) { top: 0; left: 50%; } .fully-loaded section { -webkit-transition: all 2.5s ease-in-out; -moz-transition: all 2.5s ease-in-out; transition: all 2.5s ease-in-out; } </code></pre> <p>I think in my real code that there is something that is taking a bit of time which is async like the setTimeout. <em>Desired Action: 4</em> occurs before <em>Desired Action: 2</em> How do I make <code>$("body").addClass('fully-loaded');</code> wait until everything started by <code>Tester.init()</code> is complete in a general way?</p>
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    1. COYou can't keep the order of 2..3, it will be 3..2... other than that http://jsfiddle.net/M4gcX/1/
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      1. POJavascript execution timing - ensure synchronous flow, not just order of execution
      1. USArun P Johny
    2. COYour usage of `when` is buggy because the `init` method is not returning a promise object
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      1. POJavascript execution timing - ensure synchronous flow, not just order of execution
      1. USArun P Johny
    3. CO@ArunPJohny Ah, I thought there had to be some type of call back or reference; I didn't see anything like that in the example I was working from. I tried making changes using your fiddle. 2 now executes before 4, but the transition is still there when it should not be, meaning the class is still being added before the item is removed.
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      1. POJavascript execution timing - ensure synchronous flow, not just order of execution
      1. USEric G
 

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