javascript - jQuery / PHP - Lazy loading gallery keeps trying to fetch images even when they've all loaded -

-

i've got image gallery showing 1 image per row inside of div. don't want next image load until reaches edge of viewport (to save on server resources). images named sequentially in same folder (img/1.jpeg, img/2.jpeg, img/3.jpeg, ...).

i'm using modified jquery plugin this, still keeps trying fetch next image after images in directory have been loaded. it's last if statement i'm having trouble here.

how stop function running once last image in directory has loaded?

<?php  // count total number of images in directory $directory = "img/"; $totalimages = count(glob("" . $directory . "*.jpeg")); ?>  <script type="text/javascript"> $('document').ready(function(){     scrollalert(); }); function scrollalert(){     var scrolltop=$('#scrollbox').attr('scrolltop');     var scrollheight=$('#scrollbox').attr('scrollheight');     var windowheight=$('#scrollbox').attr('clientheight');     if(scrolltop>=(scrollheight-(windowheight)))     {         // fetch next image         var nextimgnum=$('#content img').length + 1;         $('#content').append('<img src=\"book1/'+nextimgnum+'.jpeg\" /><br />');         updatestatus();     }      if(nextimgnum<=<?php echo $totalimages ?>)     {         settimeout('scrollalert();', 0);      } }  </script>

any tips optimize script appreciated :)

that script highly inefficient , keeps browser quite busy. you're in tight loop checking whether user has scrolled page , avoiding browser's script timeout via use of settimeout(). not recommend. can fix issue, why not use jquery lazy load plug-in?

http://plugins.jquery.com/project/lazyload


Comments

Post a Comment

Popular posts from this blog

android - Spacing between the stars of a rating bar? -

-
ho can set spacing beween stars? thats ratingbar: ratingbar = (ratingbar) inflater.inflate(r.layout.ratingbar, null); ratingbar.setlayoutparams(new layoutparams(layoutparams.wrap_content, layoutparams.wrap_content)); the layout: <?xml version="1.0" encoding="utf-8"?> <ratingbar xmlns:android="http://schemas.android.com/apk/res/android" style="@style/mystyle" android:layout_alignparentright="true" android:layout_height="19dp" android:layout_width="wrap_content" android:numstars="5"> </ratingbar> the style: <style name="mystyle" parent="@android:style/widget.ratingbar"> <item name="android:progressdrawable">@drawable/android_r2_ratingstar_yellow</item> <item name="android:indeterminatedrawable">@drawable/android_r2_ratingstar_grey</item> </style> thanks, cheers you have ...
Read more

html - Instapaper-like algorithm -

-
does of algorithm extracts contents webpage? instapaper ? there 2 steps instapaper does: find main content block on page (excluding headers, footers, menus etc) from content block extract , format text to find content block (typically html block element, div containing key page text content) instapaper uses algorithm 1 used readability . can @ source of readability.js see what's going on, @ core tries find area on page highest text/link ratio, although has other simple scoring metrics (e.g. off top of head, things ratio of text commas, para elements etc) go heuristics. once have identified root node element, relevant content, you'll need format it, if want can pull node element containing text out of source document , insert yours, in reality you'll want remove existing styles , apply own, standard , feel. if want output nice text-only can use jericho's renderer . update1 : should mention else instapaper - follow 'pagination' links (...
Read more

c# - How to execute a particular part of code asynchronously in a class -

-
i creating speech recognition engine that's going respond user commands.i have created button enable , disable speech recognition per user convenience.i have used dispose() of speech engine disable speech recoginition.here code private void button1_click(object sender, routedeventargs e) { engineon = !engineon; if (engineon) { speechengine = speech.createspeechengine(); //speech class creates , returns new speech engine. speechengine.audiolevelupdated += new eventhandler<audiolevelupdatedeventargs>(speechengine_audiolevelupdated); // use system's default microphone speechengine.setinputtodefaultaudiodevice(); speechengine.loadgrammar(new dictationgrammar()); // start listening speechengine.recognizeasync(recognizemode.multiple); } else { speechclass.myengine.dispose(); } } but disposal of speech obj...
Read more