www.webdeveloper.com
Results 1 to 6 of 6

Thread: Change element width using javascript

  1. #1
    Join Date
    Aug 2011
    Posts
    42

    Change element width using javascript

    Hi, I am simply trying to increase a divs width everytime a button is pressed but I can't figure out how or why. any help greatly appreciated:

    Code:
    <!DOCTYPE HTML>
    <html lang="en">
    <head>
    	<title>title</title>
    
    <style>
    .progressPercent {background:#ccc;height:20px;width:50px}
    </style>
    
    <script>
    		var increaseProgress = (function () {
    			var num = 100;
    			var elem = document.getElementsByClassName('progressPercent');
    			return function () {
    				num += 100;
    				elem.style.width = num + 'px';
    			}
    		})();
    	</script>
    	
    </head>
    <body>
    	<a href="#" onclick="increaseProgress(); return false;">BUTTON</a>
    	<div class="progressPercent">&nbsp;</div>
    </body>
    </html>

  2. #2
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    There are several ways. One is to grab the offset properties of the element
    Code:
    <script type="text/javascript">
    function increaseProgress(){
    var num=100;
    var div=document.getElementsByClassName('progressPercent')[0];
    var divWidth=div.offsetWidth;
    div.style.width=(divWidth+num)+'px';
    }
    </script>
    Note that the method document.getElementsByClassName() returns always a collection, not a single element, thus you must specify the index, [0] your case.
    Last edited by Kor; 09-26-2011 at 07:29 AM. Reason: typo. I have removed the equal sign

  3. #3
    Join Date
    Aug 2011
    Posts
    42
    thanks for your quick response but this doesn't work for me

  4. #4
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    Typo: I have inserted an equal sign, by mistake. Test this:
    Code:
    <!DOCTYPE HTML>
    <html>
    <head>
    <title>Untitled Document</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta http-equiv="Content-Style-Type" content="text/css">
    <meta http-equiv="Content-Script-Type" content="text/javascript">
    <style type="text/css">
    .progressPercent {background:#ccc;height:20px;width:50px}
    </style>
    <script type="text/javascript">
    function increaseProgress(){
    var num=100;
    var div=document.getElementsByClassName('progressPercent')[0];
    var divWidth=div.offsetWidth;
    div.style.width=(divWidth+num)+'px';
    }
    </script>
    </head>
    <body>
    <div>
    	<a href="#" onclick="increaseProgress(); return false;">BUTTON</a>
    	<div class="progressPercent">&nbsp;</div>
    </div>
    </body>
    </html>

  5. #5
    Join Date
    Aug 2011
    Posts
    42
    ok thank you. how could I use this to get all the elements on the page with that class?

  6. #6
    Join Date
    Dec 2003
    Location
    Bucharest, ROMANIA
    Posts
    15,428
    use a loop:
    Code:
    function increaseProgress(){
    var num=100;
    var divs=document.getElementsByClassName('progressPercent'), i=0, d, divWidth;
    while(d=divs[i++]){
    divWidth=d.offsetWidth;
    d.style.width=(divWidth+num)+'px';
    }
    }

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 0.39257 seconds
  • Memory Usage 2,889KB
  • Queries Executed 15 (?)
More Information
Template Usage (33):
  • (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)ad_showthread_firstpost_sig
  • (1)ad_showthread_firstpost_start
  • (1)ad_thread_first_post_content
  • (1)ad_thread_last_post_content
  • (4)bbcode_code
  • (1)footer
  • (1)forumjump
  • (1)forumrules
  • (1)gobutton
  • (1)header
  • (1)headinclude
  • (1)headinclude_bottom
  • (6)memberaction_dropdown
  • (1)navbar
  • (4)navbar_link
  • (1)navbar_moderation
  • (1)navbar_noticebit
  • (1)navbar_tabs
  • (2)option
  • (6)postbit
  • (6)postbit_onlinestatus
  • (6)postbit_wrapper
  • (1)spacer_close
  • (1)spacer_open
  • (1)tagbit_wrapper 

Phrase Groups Available (6):
  • global
  • inlinemod
  • postbit
  • posting
  • reputationlevel
  • showthread
Included Files (26):
  • ./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
  • ./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 (70):
  • 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
  • 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