www.webdeveloper.com
Results 1 to 2 of 2

Thread: Help with Buttons!

  1. #1
    Join Date
    Apr 2012
    Posts
    1

    Help with Buttons!

    I am very new with Javascript and implementing it on a webpage but trying to learn.

    I'm trying too make a simple set of functions that will flip a coin and record the resulting frequencies of heads vs tails. I also want the image to switch from heads/tails depending on how the flip function lands the coin.

    I've been working on this for three days straight with no progress.

    Please help!

    Code:
    <script src= "../hw4/hw4.js"></script>
    
    <div class="content">
    	<img id = "coinImage1" src = "../images/coinh.jpg" alt = "Coin Image">
      <form action = "#">
    	<input id = "toss" type = "button" value = "Toss">
        </form>
    	<div id= "outputavh"></div>
    	<div id= "outputavt"></div>
    </div>
    Code:
    <script>
    
    var freqh = 0;
    var freqt = 0;
    var avh = 0;
    var avt = 0;
    var coinImage;
     
    function start()
    {
    	var button = document.getElementById("toss");
    	button.addEventListener("click", flipCoin(), false);
    	coinImage = document.getElementById("coinImage1");
    }
    function flipCoin()
    {
    	setImage(coinImage);
    	updateTable();
    
    }
    function setImage(sideImage)
    {
    	var coinValue = Math.floor(1 + Math.random() * 2);
    	if(coinValue == 1)
    	{
    		sideImage.setAttribute("src", "../images/coinh.jpg");
    		sideImage.setAttribute("alt", "Coin facing Heads");
    		freqh += 1;
    	}
    	else
    	{	
    		sideImage.setAttribute("src", "../images/coint.jpg");
    		sideImage.setAttribute("alt", "Coin facing Tails");
    		freqt += 1;
    	}
    }
    function updateTable()
    {
    	avh = <h1>(freqh / (freqh + freqt))</h1>;
    	avt = <h2>(freqt / (freqh + freqt))</h2>;
    
    	var avhOut = document.getElementById("outputavh");
    	var avtOut = document.getElementById("outputavt");
    
    	avhOut.innerHTML = avh;
    	avtOut.innerHTML = avt;
    }
    window.addEventListener("load", start, false);
    </script>

  2. #2
    Join Date
    Nov 2007
    Posts
    511
    A couple changes:
    1- for your output, you need to put your <h1> tags in quotes.
    2- your math.random was missing parens around Math.random*2
    3- I removed you event listener and placed the call directly onto the image. You can probably add this back, but I removed it so that it was one less thing to trouble shoot.
    4- your "start" function is not required
    5- "coinimage" was declared inside a function and had no scope where it was used later.

    There may be a couple other minor changes that I've forgotten.

    Since this is obviously a homework assignment, I will not post the working code. But the above should be enough to point out your errors.

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 0.10454 seconds
  • Memory Usage 2,841KB
  • 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
  • (2)bbcode_code
  • (1)footer
  • (1)forumjump
  • (1)forumrules
  • (1)gobutton
  • (1)header
  • (1)headinclude
  • (1)headinclude_bottom
  • (2)memberaction_dropdown
  • (1)navbar
  • (4)navbar_link
  • (1)navbar_moderation
  • (1)navbar_noticebit
  • (1)navbar_tabs
  • (2)option
  • (2)postbit
  • (2)postbit_onlinestatus
  • (2)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 (72):
  • 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_postinfo_query
  • fetch_postinfo
  • 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