www.webdeveloper.com
Results 1 to 4 of 4

Thread: JavaScript auto scroll RSS feed loop gets slower after running certain time

Hybrid View

  1. #1
    Join Date
    Feb 2013
    Posts
    4

    JavaScript auto scroll RSS feed loop gets slower after running certain time

    Hi,
    I have a JavaScript auto scroll RSS feed page, that runs fine but it gets/responds very slow after running 24+ hours. Not sure what is the best way to create this kind of page that could run at least few months without any issue?

    Example: RSS feed auto scroll loop

    Detail info if that helps:
    I'm using a CNN RSS feed and using rssdog.com to parse data. I have a decent shared web hosting. I'm using Firefox on a windows 7 PC with 2GB of RAM. This PC is going to run 24/7 only for a feed for 3 months.

    Please let me know if there is any better way to handle this? Thanks so much (in advance)!

    Code:
    <!DOCTYPE html>
    <HTML>
    <HEAD>
    <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=UTF-8">
    <META HTTP-EQUIV="REFRESH" CONTENT="900">
    <TITLE>RSS feed autoscroll loop</TITLE>
    <META NAME="description" CONTENT="">
    <meta name="robots" content="index,nofollow" />
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
    <meta http-equiv="Pragma" content="no-cache" />
    <meta http-equiv="Expires" content="0" />

    <STYLE TYPE="text/css">
    body,html {
    min-height:100%; /*Firefox scrollbar fix*/
    }
    a, a:visited, a:hover, a:active {
    color:#333;
    text-decoration: none;
    display: block;
    padding-bottom: 12px;
    margin-top: 10px;;
    }
    #top-stories {
    font-family: 'Helvetica', Verdana, sans-serif;
    font-size: 1.5em;
    font-weight: bolder;
    text-align: left;
    line-height: 1.2em;
    margin: 0px 15px 0px 15px;
    }
    </STYLE>
    </HEAD>

    <BODY>
    <script language="JavaScript1.2">

    /*
    Top-Down scrolling window Script- Dynamic Drive (www.dynamicdrive.com)
    For full source code, visit http://www.dynamicdrive.com
    This notice MUST stay intact for use
    */

    //change 1 to another integer to alter the scroll speed. Greater is faster
    var speed=1
    var currentpos=0,alt=1,curpos1=0,curpos2=-1
    function initialize(){
    startit()
    }

    function iecompattest(){
    return (document.compatMode!="BackCompat")? document.documentElement : document.body
    }

    function scrollwindow(){
    if (document.all)
    temp=iecompattest().scrollTop
    else
    temp=window.pageYOffset
    if (alt==0)
    alt=1
    else
    alt=0
    if (alt==0)
    curpos1=temp
    else
    curpos2=temp
    if (curpos1!=curpos2){
    if (document.all)
    currentpos=iecompattest().scrollTop+speed
    else
    currentpos=window.pageYOffset+speed
    window.scroll(0,currentpos)
    }
    else{
    currentpos=0
    window.scroll(0,currentpos)
    }
    }
    function startit(){
    setInterval("scrollwindow()",50)
    }
    window.onload=initialize
    </script>

    <div id="top-stories">
    <script type="text/javascript" language="javascript" src="http://www.rssdog.com/index.htm?url=http%3A%2F%2Frss.cnn.com%2Frss%2Fedition.rss&amp;mode=javascript&amp;showonly=&amp;max items=500&amp;showdescs=1&amp;desctrim=0&amp;descmax=0&amp;tabwidth=100%25&amp;excltitle=1&amp;linkt arget=_blank&amp;bordercol=%23d4d0c8&amp;headbgcol=%23999999&amp;headtxtcol=%23ffffff&amp;titlebgcol =%23f1eded&amp;titletxtcol=%23000000&amp;itembgcol=%23ffffff&amp;itemtxtcol=%23000000&amp;ctl=0">
    </script>
    </div>

    </BODY>
    </HTML>

  2. #2
    Join Date
    Mar 2007
    Location
    U.K.
    Posts
    1,127
    Perhaps content is expiring and being reloaded, causing multiple onload events. Try modifying the initialize function as follows:
    Code:
    function initialize()
    {
      window.onload = null;
      startit();
    }
    Where used, return should be executed unconditionally and always as the last statement in the function.

    That's my signature, it's not part of the damn post!

  3. #3
    Join Date
    Feb 2013
    Posts
    4
    Thanks so much Logic Ali. I updated the function and running another test for next 24 hours. Let's see how it works. Thanks again!

  4. #4
    Join Date
    Feb 2013
    Posts
    4
    Logic Ali,
    This time it worked well without any problem. Thanks so much.

    One more question: Do you think this script might cause Firefox throwing script error/warning message (e.g. a script on this page may be busy...) if I keep running this for few months non-stop? If yes, then what are the other options to parse and display RSS feeds?

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
HTML5 Development Center

"

"

X vBulletin 4.2.2 Debug Information

  • Page Generation 0.12816 seconds
  • Memory Usage 2,986KB
  • Queries Executed 13 (?)
More Information
Template Usage (30):
  • (1)SHOWTHREAD
  • (1)ad_footer_end
  • (1)ad_footer_start
  • (1)ad_global_above_footer
  • (1)ad_global_below_navbar
  • (1)ad_global_header1
  • (1)ad_global_header2
  • (1)ad_navbar_below
  • (1)bbcode_code
  • (1)footer
  • (1)forumjump
  • (1)forumrules
  • (1)gobutton
  • (1)header
  • (1)headinclude
  • (1)headinclude_bottom
  • (4)memberaction_dropdown
  • (1)navbar
  • (4)navbar_link
  • (1)navbar_moderation
  • (1)navbar_noticebit
  • (1)navbar_tabs
  • (2)option
  • (4)postbit
  • (4)postbit_onlinestatus
  • (4)postbit_wrapper
  • (1)showthread_list
  • (1)spacer_close
  • (1)spacer_open
  • (1)tagbit_wrapper 

Phrase Groups Available (6):
  • global
  • inlinemod
  • postbit
  • posting
  • reputationlevel
  • showthread
Included Files (27):
  • ./showthread.php
  • ./global.php
  • ./includes/class_bootstrap.php
  • ./includes/init.php
  • ./includes/class_core.php
  • ./includes/config.php
  • ./includes/functions.php
  • ./includes/functions_navigation.php
  • ./includes/class_friendly_url.php
  • ./includes/class_hook.php
  • ./includes/class_bootstrap_framework.php
  • ./vb/vb.php
  • ./vb/phrase.php
  • ./includes/functions_facebook.php
  • ./includes/functions_calendar.php
  • ./includes/functions_bigthree.php
  • ./includes/class_postbit.php
  • ./includes/class_bbcode.php
  • ./includes/functions_reputation.php
  • ./includes/functions_notice.php
  • ./includes/functions_threadedmode.php
  • ./packages/vbattach/attach.php
  • ./vb/types.php
  • ./vb/cache.php
  • ./vb/cache/db.php
  • ./vb/cache/observer/db.php
  • ./vb/cache/observer.php 

Hooks Called (71):
  • init_startup
  • friendlyurl_resolve_class
  • init_startup_session_setup_start
  • database_pre_fetch_array
  • database_post_fetch_array
  • init_startup_session_setup_complete
  • global_bootstrap_init_start
  • global_bootstrap_init_complete
  • cache_permissions
  • fetch_threadinfo_query
  • fetch_threadinfo
  • fetch_foruminfo
  • load_show_variables
  • load_forum_show_variables
  • global_state_check
  • global_bootstrap_complete
  • global_start
  • style_fetch
  • global_setup_complete
  • showthread_start
  • showthread_getinfo
  • strip_bbcode
  • friendlyurl_clean_fragment
  • friendlyurl_geturl
  • forumjump
  • cache_templates
  • cache_templates_process
  • template_register_var
  • template_render_output
  • fetch_template_start
  • fetch_template_complete
  • parse_templates
  • fetch_musername
  • notices_check_start
  • notices_noticebit
  • process_templates_complete
  • friendlyurl_redirect_canonical
  • showthread_post_start
  • showthread_query_postids_threaded
  • showthread_threaded_construct_link
  • showthread_query
  • bbcode_fetch_tags
  • bbcode_create
  • showthread_postbit_create
  • postbit_factory
  • postbit_display_start
  • postbit_imicons
  • bbcode_parse_start
  • bbcode_parse_complete_precache
  • bbcode_parse_complete
  • postbit_display_complete
  • memberaction_dropdown
  • tag_fetchbit_complete
  • forumrules
  • navbits
  • navbits_complete
  • build_navigation_data
  • build_navigation_array
  • check_navigation_permission
  • process_navigation_links_start
  • process_navigation_links_complete
  • set_navigation_menu_element
  • build_navigation_menudata
  • build_navigation_listdata
  • build_navigation_list
  • set_navigation_tab_main
  • set_navigation_tab_fallback
  • navigation_tab_complete
  • fb_like_button
  • showthread_complete
  • page_templates