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POHow to run multiple internal javascript codes asynchronously and not block?
 

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  1. POHow to run multiple internal javascript codes asynchronously and not block?
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    <p>I have a webpage created by a php script that upon loading will contain 0 to N div elements. For each div I run a specific javascript code that manipulates data relevant to that div. One of the things this code does is create an <em>img</em> element and set its '<em>src</em>' attribute to a certain url of an image of a known (but variable) size. This is done for caching. Those images are not supposed to be displayed in the initial page layout - but each should appear after a certain user input (mouse hover) - so I'm trying to cache the images so it won't take long for them to appear.</p> <p>The loading of the images of-course takes time - and each time an image loads the code blocks resulting in high load times. an example:</p> <pre><code>&lt;div id="i1"&gt; &lt;script type="text/javascript"&gt; /* run code relevant to 'i1', and amongst other things load some image into a detached img element for later use. let's call this code 'bcode' */ &lt;/script&gt; &lt;div id="i2"&gt; &lt;script type="text/javascript"&gt; /* run 'bcode' for i2 */ &lt;/script&gt; &lt;div id="...and so on"&gt; </code></pre> <p>To try having the code run asynchronously, I tried this:</p> <pre><code>&lt;div id="i1"&gt; (function() { var asyncScriptElement = document.createElement('script'); asyncScriptElement.async = true; var scriptText = document.createTextNode ('here I put all of the relevant "bcode"'); asyncScriptElement.appendChild (scriptText); document.getElementById ('Img_1_2').appendChild (asyncScriptElement); }()); </code></pre> <p>It works under FF (still not fast enough), and it obviously doesn't work under IE. Do you have any suggestion as to how to achieve this? Also note, that I don't really need to get anything from another external php (i.e. to use XMLHttpRequest) - I got all the data I need in this php. I just need a way to make the loading of the images unblocking...</p>
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